Variable Feed Rate Research Articles

Modeling and optimization of Wire –EDM parameters for machining of Ni54.1Ti45.9 shape memory alloy using hybrid approach

Shape memory alloys are a distinct family of alloys recognized for their unique features, such as extreme anti-fatigue, exceptional specific strength, corrosion resistance, biocompatibility, and pseudo-elasticity. Due to strain-hardening effects displayed by the latter during a conventional machining process, these features make shape memory alloys particularly functional for machining utilizing non-traditional methods rather than conventional ones. The alloy's original qualities are at risk as a result of this consequence. Nickel-Titanium shape memory alloys with 54.1 and 45.9% Nickel-Titanium blends were employed in this investigation (Ni54.1Ti45.9). The surface characteristics of Ni54.1Ti45.9 alloy are investigated using the wire electrical discharge machining (WEDM) technique with a brass tool electrode (zinc-coated) and the influence of process parameters on it. Variations in wire feed rate, wire tension, pulse on and off duration, and peak current were used as input factors to investigate variations in surface roughness and material removal rate. Surface roughness and material removal rate data from L27 orthogonal array (OA) studies were used to create artificial neural network (ANN) models. To improve the quality attributes, a model combining a hybrid version of the genetic algorithm (GA) and an ANN has been presented. The ANN models were found to accurately predict the results, which matched the experimental data. After the adjustment, the quality features also improved significantly.

Testing a new laboratory-scale high-frequency screen for continuous trials with smaller samples

Laboratory devices are key to modeling processes and allowing scale-up simulations to assess industrial scale performance. This study presents the development of a laboratory-scale high-frequency screen for continuous trials and initial modeling assessment using two different approaches. The models are assessed according to accuracy and precision for the data set considered. Additionally, the sensitivity of their parameters to changes in process conditions is analyzed for variations in solids concentration, feed rate and screen aperture. For both modeling accuracy and parameter sensitivity, Mwale et al. model presented better results, indicating a more suitable model for dataset description and process simulation.

A method to improve position accuracy for the dual-drive feed machines by state-dependent friction compensation

Due to high stiffness and quick response, dual-drive feed machines (DDFMs) are widely used in many precision CNC machines. The tracking errors of the two feed drives directly determine the machines’ accuracy. The performance of the position accuracy can be easily affected by the difference in the friction dynamic characteristics of the two axes. This paper proposes the state-dependent friction compensation (SFC) as an improved DDFMs error compensation method that can achieve better accuracy under unequal friction on the two feed drives. It is theoretically analyzed the influence of friction on the transmission stiffness of DDFMs. Moreover, the effects of time-varying factors (feed rates and mechanical structures) on the friction of dual axes are discussed. The innovation of the paper is that the SFC can adaptively take into account the influence of the variable dual-drive structure and feed rate on DDFMs’ position accuracy, and the compensation method combined with cross-coupled strategy is suitable for general dual-drive structure. Simulation and experiment results show that the proposed method can effectively improve the synchronization accuracy and tracking accuracy in a variety of feed operations (different feed rates, starting, and reversing).

Effects of microplastics on the feeding rates of larvae of a coastal fish: direct consumption, trophic transfer, and effects on growth and survival.

Microplastics are now found throughout the world’s oceans, and although many organisms ingest microplastics, less is known about how plastics in seawater may affect key processes such as feeding rate, growth, and survival. We used a series of laboratory experiments to test whether microplastics in seawater affected the feeding rates of larvae of the California Grunion, Leuresthes tenuis. In addition, we tested whether trophic transfer of microplastics from zooplankton to larval fish can occur and affect growth and survival of fish. We measured feeding rates of grunion larvae at various concentrations of 75–90 µm and 125–250 µm polyethylene microplastics and under both still water and turbulent conditions. In these experiments, exposure to microplastics had modest effects on feeding rates, though responses may be somewhat complex. Low concentrations of microplastics increased feeding rates compared to the control, but at higher concentrations, feeding rates were indistinguishable from those in the control group, though effects were small compared to natural variation in feeding rates among individual fish. Experiments to test for trophic transfer of microplastics revealed that grunion larvae that were fed brine shrimp exposed to high concentrations of microplastics had lower growth rates and elevated mortality rates. Overall, our results suggest that the direct effects of microplastics on feeding rates of California Grunion during the early larval phase are minor, while the trophic transfer of microplastics from zooplankton to larval fish may have significant effects on their growth and survival.Supplementary InformationThe online version contains supplementary material available at 10.1007/s00227-021-04010-x.

Ultra-precision turning method efficient for optical freeform surfaces with a hybrid slow-fast tool servo.

The machining of freeform surfaces is a current research hotspot: A slow tool servo (STS) has limitations in machining accuracy and efficiency for large steep freeform surfaces. Most fast tool servo (FTS) tools are limited by their stroke and cannot manufacture freeform surfaces with a large sag. We propose a hybrid slow-fast tool servo method that combines STS and FTS to machine large steep freeform surfaces by decomposing the freeform surfaces and simultaneously turning efficiently with STS and FTS. Experimental studies were undertaken to fabricate a saddle surface. Meanwhile, a variable feedrates tool path was designed and applied to further improve the machining efficiency. The results show that this method can improve the processing efficiency by 47.5%. The arithmetic mean of surface roughness (Ra) is 2-4 nm, and the peak-to-valley (PV) value is 0.4780 µm at the hollows and 0.3884 µm at the swells.

Optimization of cutting force via variable feed rate in dry turning lathe of AISI 304

When we talk about metal cutting or metal removal process, turning operation is found to be the most favorable because of the ease with which it can be performed, also it is economical and gives significant results. But even though every industry focuses on optimization of turning process by increasing the metal removal rate and decreasing the power consumption by decreasing the cutting forces. This is achieved by setting up the optimum control factors which are decided by a series of experiments performed by adjusting input parameters like feed, cut depth, and cutting speed. This paper is focused on optimizing the cutting force by varying feed, cutting depth & cutting speed at various levels in AISI 304 SS turning with cemented-carbide insert as cutting tool. The experiment was developed on the basis of Taguchi’s method of Design of Experiment which uses Taguchi’s L9 Analysis of S/N ratio & Orthogonal Array Technique is done to get a plot for optimized control factors. Later ANOVA analysis is done to find out the relation between cutting force and control factor which demonstrates the contribution of each factor of control towards the cutting force.

Simulation of the effect of evaporation and gas composition during plasma spheroidization of titanium particles

A 3D model was proposed that describes the in-flight behavior of titanium particles in the plasma environment, developed in the commercial CFD Ansys Fluent software, which described the heating of particles. The rate of evaporation was investigated based on the gas compositions, and the mass evaporated on the surface of the particle along the trajectory under plasma conditions. To evaluate the spheroidization rate of titanium particles, the calculated temperature and flow histories were established. Significant heat exchange behaviors are presented due to the variations in hydrogen content and feed rate. The simulation results have demonstrated that the range of 0-4% of H2 and at a low injection feed rate of 3-10 g/min minimized the evaporation rate and increased the spheroidization rate of particles.

Development and performance evaluation of the electric-hydraulic concave clearance control system based on maize feed rate monitoring

Complex field environments, diverse crop conditions, and varying feed rate fluctuations commonly result in a decline in the threshing performance and the clogging of the threshing cylinder for maize harvesters. In order to overcome these problems, an electric-hydraulic concave clearance automatic control system for the threshing unit was developed based on the maize feed rate monitoring, which can automatically realize the best match between the concave clearance and diverse feed rates during harvesting. The threshing performance of the electric-hydraulic control system was evaluated for varying and uneven maize feed rate fluctuations, such as the feed rate increased (6-8-10 kg/s), the feed rate decreased after an increase (6-10-8 kg/s, 8-10-6 kg/s), the feed rate increased after a decrease (8-6-10 kg/s, 10-6-8 kg/s), and the feed rate decreased (10-8-6 kg/s). In particular, the threshing rotor shaft peak torque, the range of threshing rotor shaft torque, the rate of broken grains (BGR), and the rate of unthreshed grains (UGR) with and without the electric-hydraulic control system were tested. Treatments with the electric-hydraulic control system were adjustable concave clearance with the value of 45 mm, 50 mm, and 55 mm. Treatments without the electric-hydraulic control system were constant concave clearance (50 mm). Results demonstrate that the threshing unit with the electric-hydraulic control system outperformed the one without the electric-hydraulic control system, with threshing rotor peak torque, the range of threshing rotor axis torque, the BGR, and the UGR decreasing by 18.38%, 38.27%, 2.08%, and 0.10%, respectively. Moreover, the rate of broken grains was lower than 5.00%, better than the national standard. Thus, the feed rate fluctuations and timely adjustment of the concave clearance were able to avoid blocking the rotor and improve the threshing performance compared to the constant concave clearance. Keywords: maize harvester, threshing cylinder, feed rate, concave clearance, electro-hydraulic control system DOI: 10.25165/j.ijabe.20221502.6369 Citation: Fan C L, Zhang D X, Yang L, Cui T, He X T, Zhao H H. Development and performance evaluation of the electric-hydraulic concave clearance control system based on maize feed rate monitoring. Int J Agric & Biol Eng, 2022; 15(2): 156–164.

Effect of feed rate and depth of cut on face milling process on surface roughness of Al-Mg alloy using CNC milling machine 3 axis

The purpose of this study was to determine the effect of feed rate and depth of cut on the surface roughness of Al-Mg aluminum using a DIY CNC Milling Machine and Krisbow Universal Milling Machine as a comparison. The open-loop control system is a control system used in the design of DIY CNC Milling machines. A PC with Mach3 software is used as a PC Based Direct Digital Controller to control the system. In this study, the feed rate variation 24 mm/minute and 42 mm/minute and depth of cut 0.25 mm, 0.5 mm, and 0.75 mm were used. After the face milling process, the surface roughness test was carried out using the Mitoyo Surface Roughness Tester to determine the level of surface roughness of the machining results the DIY Milling Machine and Krisbow Universal Milling Machine as a comparison. The results showed that as the feed rate and depth of cut increased, the surface roughness values of both tools increased.

Scraping and grazing herbivorous/detritivorous fish display opposite feeding behaviours under different protection regulations

ABSTRACT Herbivorous and detritivorous fish display complex feeding behaviour, and research into how feeding behaviour changes with environmental and social variables is lacking. Such knowledge is imperative to infer how herbivory/detritivory will differ, in light of shifting resources and communities and specifically whether reefs can recover from disturbance. Fish abundance, feeding rate, body size, diet and schooling feeding of three major functional groups (scrapers, grazers and browsers) were examined across reef types under different fishing regulations. Scrapers and grazers (parrotfishes and surgeonfishes) were more abundant and displayed the highest feeding rates on reef flats. Scrapers mainly resided inside the restricted zone, while more grazers were found in the general use zone, where macroalgal abundance was highest. Browsers (rabbitfishes) were seldom observed and patchily gathered on the reef flat and reef slope in both zones. Thus, fishing protection did not appear to benefit grazers and browsers, whereas more scrapers gathered on shallow reef flats in the protection zone. Scraper and grazer feeding rates increased from an individual to a pair and increased with body size, these factors led to variations in feeding behaviours across reef types and protection regulations. Protection appears to benefit scrapers and variations in feeding rates were largely related to school size. Lastly, grazer density was associated more with macroalgal coverage than protection status. The opposite feeding behaviours of scrapers and grazers indicates not only protection status, but fishing restrictions and size limit regulations are needed to maintain coral reef fisheries and functional diversity on coral reefs in Taiwan.

An Experimental Study on Copper Plates Using Friction Drilling.

Abstract: Friction drilling is a novel hole-making method that can be performed on thin-walled sheets. In recent years of study, the thrust force and torque under numerous process conditions were performed to demonstrate the benefits. In recent years of study, the thrust force and torque under various process conditions were performed to demonstrate the benefits. Our objective is to review the behavior of the material with the use of friction drilling by variation of thickness, Spindle speed, and feed rate. Our objective is to study the behavior of the material with the use of friction drilling by variation of thickness, Spindle speed, and feed rate. The friction between a rapid rotating conical tool and a sheet metal workpiece generates heat to soften and displace the metal to form a whole. Friction drilling is a non-traditional hole-making process in which a conical rotating tool is applied to penetrate the workpiece and make the outlet in a single step, without generating chips. the process relies on the heat generated thanks to the resistance force between tool and workpiece, to soften, penetrate and deform the work material into a bushing shape. Generally, friction drilling is applied to thin-walled materials owing to increasing connection length and clamping strength. The generated resistance heat cause softening piece of work material, increase its ductility, and providing it to flow, that extruded onto both the front and back sides of the holes. Keywords: Friction Drilling, Conical Tool, Material Displace, Temperature, Hardness & Thickness.

Subregional Process Method With Variable Parameters Based on a Potential Field in Slow Tool Servo Machining for a Complex Curved Surface

Abstract Precision turning with slow tool servo (STS) plays an increasingly important role in advanced manufacturing nowadays. However, it is difficult to promote machining quality for surfaces with local complex geometric features by the conventional global machining method. Hence, a subregional processing method in STS is proposed. First, the continuous equipotential line is taken to express the local geometric feature. Thus, a potential field is built, where the surface could be divided into subregions. Then, a subregional toolpath with variable feed rates is generated by the field and stitched to ensure the feeding motion stability of X-axis. Finally, the surface is subdivided for variable spindle speed planning, considering the feeding motion stability of Z-axis. It is found that the profile arithmetic average error reduces by 31.58% with the proposed method compared with that with the conventional method and the machining time is shortened by 41.00%. Thus, it is proved that the new processing method effectively promotes machining quality and efficiency.

Finite element simulation and experimental validation of machining martensitic stainless steel using multi-layered coated carbide tools for industry-relevant outcomes

Martensitic stainless steel is widely used where there is a need for strength, hardness, and corrosion resistance. But the machinability of this steel is difficult because of its poor thermal conductivity, as it leads to high tool wear. Application of coating on the cutting tool is one of the sustainable techniques utilized in improving the machinability of work material. But the problem in the application of the coated tool is the determination of different coating materials and the thickness of coatings, and it usually requires extensive experimental tests. Therefore finite element modelling has proved to be one of the important techniques which can be employed in evaluating the machining performance of coated cutting tools. In the current work, oblique cutting experiments, 2D, and 3D FEM simulations have been performed while machining the martensitic AISI 420 steel using the multi-layered (TiN-TiCN-Al2O3-TiN, TiN-Al2O3-TiCN-TiN) coated carbide tools and uncoated carbide tool. A tabular data material model has been utilized to model the work material. Initially, the simulation results of tangential forces obtained using 2D FE and 3D FE machining models are validated with the experimental tangential forces at a feed rate (f) of 0.14 mm/rev, depth (d) of 0.3 mm, and cutting velocity (V) of 230 m/min. It has been observed that a maximum error of 59.10% in the tangential force has been observed using the 2D FE machining model and experimental results, while a maximum error of 4.05% has been observed using the 3D machining model and experimental results. Thus it indicates that the 3D FE machining model is more suitable in the prediction of machining responses. The 3D FE machining model has been further validated with the experimental results in terms of tangential force and feeds force using the different coated and uncoated cutting tools at varying feed rates of 0.14, 0.18, 0.224, and 0.25 mm/rev and at depth d = 0.3 mm, cutting speed V = 230 m/min. A maximum error of 13.97% in the tangential force and 5% in the feed force is observed at different cutting conditions. The validated model has been further utilized to examine the influence of tool coatings and cutting parameters on the effective stress, cutting temperature, cutting power, and tool temperature. The developed 3D FE model indicates that the better machinability of martensitic AISI 420 steel can be achieved using the multi-layer TiN-TiCN-Al2O3-TiN coated tool in terms of reduction in cutting temperature, effective stress, and power consumption.

Investigation on Thrust and Torque Generation During Drilling of Hybrid Laminates Composite with Different Stacking Sequences Using Multiobjective Optimization Module

This paper highlights the reinforcement of two different fibers in the manufacturing of hybrid laminate composites. The feasibility of glass and carbon fiber-based hybrid composites is proposed for various high performances due to their versatile mechanical properties. However, anisotropic and non-homogeneity nature creates several machining challenges for manufacturers. It can be regulated through the selection of proper cutting conditions during the machining test. The effect of process constraints like spindle speed (rpm), feed rate (mm/min), and stacking sequences ([Formula: see text] was evaluated for the optimum value of thrust force and Torque during the drilling test. The cost-effective method of hand layup has been used to fabricate the composites. Four different hybrid composites were developed using different layers of carbon fiber and glass fiber layers. The outcomes of variables on machining performances were analyzed by variation of feed rate and speed to acquire the precise holes in the different configurations. The application potential of the proposed composites is evaluated through the machining (drilling) efficiency. The optimal condition for the drilling procedure was investigated using the multiobjective optimization-Grey relation analysis (MOO-GRA) approach. The findings of the confirmatory test show the feasibility of the MOO-GRA module in a machining environment for online and offline quality control.

Investigating the Potentials of Sluice Box Angle of Tilt on the Beneficiation of Birnin-Gwari Gold Deposit

The potentials of sluice box angle of tilt on the beneficiation of Birin-Gwari gold deposit was investigated. The sample was sourced from twenty (20) pits on the mine site and homogenized towards chemical characterization. Particle size analysis using 100 g head sample over the sieve range of 500 µm and 45 µm. 100 g each of the homogenized samples was charged into the sluice box at varied tilt angles ranging from 10º to 60º and also at a varying feed rate of 50 kg/hr to 100 kg/hr at 1000 mls flow rate. The Energy Dispersive X-ray Fluorescence Spectrometry (ED-XRFS) revealed 10.15 ppm Au, 0.43% Fe, 0.05% Pb, and other constituent elements in trace form. Particle size analysis showed the liberation size to be -125+90 µm. The highest yield in mass was given as 32.70 g assaying 43.20 ppm at an angle of 10º and varied feed rate while keeping other parameters/constituent constant and also, 56.32 g was the highest yield in mass assaying 12.83 ppm at 50 kg/hr feed rate.Keywords: Birnin-Gwari gold, Beneficiation, Characterization, Sluice box.

Effects of Mill Speed and Air Classifier Speed on Performance of an Industrial Ball Mill

Nowadays, ball mills are widely used in cement plants to grind clinker and gypsum to produce cement. The research focuses on the mill speed as well as air classifier speed effect on the two compartment Cement ball mill performance in terms of Blaine, Sulphur trioxide contents, mill power, mill residue and mill residence time. Special importance was assigned to the study of the specific surface area and the surface area production rate, both during the variation with the mill speed and the air classifier speed. Within the content of this work, sampling campaigns were organized around a cement grinding circuit and varying cement ball mill speed as well as an air classifier speed at various dosage feed rate. The fact that such an examination has not been made previously by using industrial data rather than lab scale makes this work unique. The fineness is measured in terms of Blaine number. Mill speed and air classifier speed were the investigating parameters. It was deduced that depending on the speed of mill and air classifier, their effects on Blaine, SO3, mill power and mill performance were varied, ultimately all of them improved the performance of grinding and classification operations. The rapid expansion of ceramic wastes in China has raised great many interests in their sustainable uses in building materials The micro ceramic powder can be taken as a supplementary cementitious material to replace cement up to 40% for tuning the microstructure and mechanical properties of blend cement materials. The Blaine quality dictates strength, setting time and overall performance of cement. Optimum performance of ball mill could potentially refine Blaine fineness, thereby improving the cement quality. This study investigates the effects of separator speed and mill speed on Blaine fineness, mill residue, consumed power. Five speed levels used in closed cycle grinding mill are 200, 400, 600, 800 and 1000 rpm. The capacities were determined to obtain product Blaine surface areas in the limits between 2000 cm2 / gram and Variations in clinker feed rate, mill speed and separator speed could proportionally impact the grain quality of Blaine. When the separator speed is increased from 850 to 900 rpm the Blaine is increased from 2800 to 3000 cm2/g and mill residue decrease from 15 to 10 microns. Therefore, optimum parametric combination could reduce power consumption while improving the cement quality. Knowledge of effects of parametric variations on the quality of end product could be helpful for controlling product quality. Furthermore, proper grinding of clinker produces fine Blaine at first place and reduces the need for recycling of coarse grains.

Feed management of Litopenaeus vannamei in a high density biofloc system

One area with significant potential for improvement in commercial shrimp production is feed management. Consequently, feed management is critical to optimize especially in intensive systems. Hence, the purpose of this study was to observe the response of Litopenaeus vannamei to different feed inputs in an intensive production system. The growth trial was conducted in an outdoor biofloc recirculating aquaculture system consisting of 24, 0.75m2 culture tanks stocked at a density of 160 shrimp/m2 (initial weight 0.17 g) and grown for 63 days. Treatments consisted of seven varying feeding rates (30%, 60%, 90%, 105%, 120%, 135%, and 150%) which was offered 4 times per day, and an eighth treatment that was fed 150% of the standard feeding rate using a belt feeder that fed six times daily. At the conclusion of the trial, significant differences in final weight and feed conversion ratio were observed. Regression analysis performed on the first three feeding rates (30%, 60% and 90%) determined that natural foods were responsible for approximately 280 g of total shrimp biomass, or 17% of maximum biomass gain. Results indicated that increasing feed rates over 100% of the standard rate led to an increase in final weight, albeit shrimp growth shows signs of approaching plateau, and FCR increases. Results demonstrate efficacy of culturing shrimp in high density biofloc systems across a range of feed inputs and achieving desirable growth (1.27–1.55 g/week), final weight (11.62–14.15), feed conversion ratios (1.04–1.19), and survival (94.17–96.94). Restrictive feeding produces the most efficient use of feed, albeit at a cost of total weight gain. As maximum gain is approached, there is an inflection point at 101% of the standard feeding rate where growth and feed utilization decline rapidly leading to increase in FCR and smaller gains in growth. Hence, a goal for maximum gain will be offset by increased FCR. Consequently, to maximize nutrient utilization it is recommended to feed below maximum gain.

Comparison of Time Taken for Feeding Stable Preterm Babies Between Regular Nurse Feeding and Feeding with Feed Rail-A Randomized, Controlled Study.

ObjectiveTo compare the variation of feeding rate and time taken for feeds between manual and automated feeding via feed rail.MethodsStable preterm babies weighing between 1 and 2 kg, on partial or full enteral feeds via gavage were randomized into gravity and feed rail feeding group, respectively. Ten nurses and 4 babies were paired to form 40 nurse-baby pairs for the study. Forty feeding events in each groups were recorded.ResultsThe median duration of feeding in the feed rail group was 18.5 min compared to 15 min in nurse-led feeding (p = 0.34). Feeding rate corrected for bodyweight ranged between 0.8 and 2.3 mL/kg/min in the feed rail group compared to 2.5 and 8.9 mL/kg/min in the control (manual gravity feed) group. This difference in the feed rate variation was statistically significant (p value of <0.0001). The median feed rate with feedrail was 1.3 mL/min as compared to 4.1 mL/min with manual gravity feeds. During the feed rail feeding, nurses were hands-free for 80% of the time.ConclusionFeed rail feeding results in slow, sustained, and minimal variation in gravity feeding at a rate of 1 to 2 mL/kg/min without affecting the feeding duration compared to manual nurse-led feeding.Trial RegisteredClinical Trials Registry India (CTRI/2020/06/025958).Supplementary InformationThe online version contains supplementary material available at 10.1007/s12098-021-03770-0.

OPTIMIZATION OF VARIABEL HELIX ANGLE PARAMETERS IN CNC MILLING OF CHATTER AND SURFACE ROUGHNES USING TAGUCHI METHOD

In the manufacturing industries, the main problem in process of operating CNC milling machine was chatter effect (self-excited vibration) which increases the quality of the surface roughness. In this study is to determine optimal value of parameters for chatter and surface roughness. The chatter measured using accelerometer MPU-6050 with Arduino by software LabVIEW-2019 based on peaks-FFT value and the surface roughness measured by SJ-301 tester. The research parameters like variable helix angle, spindle speed, feed rate, and depth of cut using stainless steel 304 by Taguchi method. The optimum parameters value obtained are variable helix 35/38 degrees, spindle speed 3000 RPM, feed rate 150 mm/min and depth of cut 0.4 mm. Based on ANOVA value, the variable helix angle and depth of cut are found to be significant for chatter and surface roughness. The depth of cut was high contribution by ANOVA chatter by 93.84% and surface roughness by 91.93%.

The Sensitivity of PBX 9502 to Drilling Operations

AbstractPolymer‐bonded explosive (PBX) 9502 (95 % TATB, 5 % Kel F‐800 by weight) is dry‐drilled on a CNC milling machine and its thermomechanical response to varying feed rates, drilling speeds, and peck depths with 4 mm and 5 mm diameter drill bits is investigated. The tested samples are affixed to a force sensor that enables recording temporally resolved cutting forces and torques, and a drill‐embedded thermocouple yields local temperature data. From the data, an empirical relationship between temperature changes and feed per revolution is developed, which reveals reduced temperatures in higher feed per revolution regimes for PBX 9502. The observed relationship allows extrapolating to temperatures for other hole diameters, indicating increased temperature for smaller diameter drilling across the board. Additional testing was performed with PBX 9501 (95 % HMX, 2.5 % Estane®, 2.5 % BDNPA/BDNPF by weight), albeit over a reduced parameter space, which revealed the opposite behavior for the feed per revolution temperature dependence. It is concluded that both PBX 9502 and PBX 9501 can be dry‐drilled efficiently beyond the limits of presently applicable US‐DOE standards, where cutting interface temperatures remain far below material critical temperatures. Finally, data reveals that coolant usage in the drilling process for these materials provides a wide safety margin.