005 inch/revolution Adjusting feed rate to about 3. Used for up to 62 HRc hardened steel, titanium, nickel-based alloys and stainless steel at high speeds and medium feeds. The Speeds and Feeds Calculator may be employed for calculations of estimated speeds and feeds (RPM and IPM) values on the basis of the parameters you have currently set based on your tools and stock material. technology and incorporated state of the art features while improving reliability and speed. Tweet. Hammermill's idea of the annular cutter sounds good. Always use the speeds and feeds recommended from your tool manufacturer. 0625" wide by half inch deep. Calculations use the desired tool diameter, number of teeth, cutting speed, and. Forming can be done in cold forming conditions. Max spindle speed is 6K and max feed is 200ipm (Haas TM-1). 057 3/16 0. Feed Rate = RPM x Chip Load x Number of Teeth. Recommended feeds and speeds for turning a hardened steel (63 HRC) Thread starter OVO345; Start date Jan 3, 2023; Replies 18 Views 1,125 O. 5 inch (63. 002] and stepdown [0. 25. Calculations use the desired tool diameter, number of teeth, cutting speed, and. Cutting speed (v c) Metric (m/min) Imperial (ft/min) Formulas for internal thread milling Calculated version. Introduction . need a little help feeds/speeds in ar400. Cobalt alloys are widely used because of such reasons: Cobalt alloys have high hot corrosion resistance. Use Higher Feed Rates in Soft Materials. Hammermill's idea of the annular cutter sounds good. 27. From a reference, 'Machining Stainless Steels' here are some feed and speed suggestions; Carbide Turning doc . 010″ depth of cut is only 0. 006 MT7 MT7 ISO Materials Cutting Speed ft/min MT7 PGeneral feeds and speeds using a 1/8″ single flute flat aluminum cutting end mill. 5" wide x 20" long 1" thick AR-400 plates that need a centered slot cut completely through them 3. 005" The milling values are for uncoated high speed steel. For a 0. As a DML TA, you need to understand basic calculations that will allow the tools you use to work as intended. May 5, 2023. T - Number of Teeth. $69. 0625" wide by half inch deep. 077 5/8 Edge Start 13 146 16. I have some 5/8" solid carbide endmills that i would like to try a trochodial tool path with, basically just for practice and to test this kind of tool path. , for drilling) or the workpiece (e. Aluminium. As you may note, cutting speed is shown in range terms. 75mm pitch tap. When feed rates approach the 0. 05-05-2005, 08:16 PM. They are time savers, especially for larger size holes. High Strength Ferritic, Martensitic, and PH Stainless Steels 350-450 HB; 35-43 HRC; 900-2400 N/mm^2 UTS (354)In actual use, depending on the machine environment and workpiece material, significantly higher speeds & feeds may be achievable. Material Aluminum/Aluminum Alloys. 25 = 1600 Your feedrate should be: Feed Rate = 1600 x 2 x . Chip Load = The amount of material removed, per revolution per cutting edge. 150” Speed 70 fpm Feed . Calculations use the desired tool diameter. 5" wide x 20" long 1" thick AR-400 plates that need a centered slot cut completely through them 3. I have some 5/8" solid carbide endmills that i would like to try a trochodial tool path with, basically just for practice and to test this kind of tool path. I have a 4. The Speeds and Feeds Calculator uses the following formulas: RPM = (12 * Surface Speed) / (PI * Tool Diameter) [revs/min] Feed Rate = RPM * Chip Load * Number of Teeth (Flutes) [in/min] Where PI is the constant (3. AR400F is quenched and tempered through hardened wear resistant grades of abrasion resistant steel plate used for high impact and abrasion resistance. ago. Tangential velocity on the surface of the tool or workpiece at the cutting interface. The formula for spindle speed (rpm) is cutting speed (sfm) 5 3. The main results are the cutting speed and feedrate, secondary results such as power consumption and operation time, and carbide grade recommendations. Feed Rate f (mm/rev) H Type L Type G Type ACP300ACP300 ACM300 ACK300 DL1500DL1500 M Stainless Steel Steel P (High-speed Drilling) Cast Iron K (High-speed Drilling) Cast Iron K (General Drilling) Non-Ferrous N Metals Grade Work Material P Steel (General Drilling) ACP100ACP100 L Type P K G Type P K H Type P K H P G P M L Type P M Type L Type P K. 004-. 2 - 55kW (74Hp)Milling Speed and Feed Calculator. Optimizing feed rates and speeds: 1. The speed and feed are just ridiculous; something like 800 to 1000 rpm and maybe 10ipm feed with lots of coolant should work. I'm needing to machine several stepped pockets in some AR400 steel plate. For the predrill it tells me to use 10000 RPM (max of my machine) and 13 in/min feed rate. 82 / . A588 is a high strength, low alloy steel plate that was developed for use cases demanding higher strength and a longer life cycle. 053 14 GA 0. While narrow-diameter drill bits must maintain a minimum speed to be effective, wider bits, especially when used to bore deeper holes, must be dialed back to lessen the risk of breakage. com. The chip load (feed/tooth) is based on the material and the geometry of the tool tip. #1 Drilling AR400 Steel 10-30-2006, 02:36 PM Anyone know whether AR400 (abrasion resistent, BH 400) can be drilled easily with HSS or cobalt drills? Got some. Our tests have shown the above to give the best results, but there may be a slight. 004-. Spade Drill Speeds and Feeds and Ultimate Guide. Category overview ; List of all discussion forums ; The 100 latest forum topics ; IndustryArena. Increased production levels at higher feeds and speeds and longer tool life in high heat applications are the primary benefits. Always use the speeds and feeds recommended from your tool manufacturer. Power Route 1/4" 2 flute at 24000 rpm (max speed) on MDF is 172. Titanium Aluminum Nitride (TiAlN) coatings are high-performance coatings used for all types of materials. (See Fig. Use Higher Feed Rates in Soft Materials. 30% but the addition of 0. AR500: 460-544 BHN Typically. Joined Oct 31, 2007 Location Miami Fl, USA. The premier source of tooling, parts, and accessories for bench top machinists. Cutting speeds greater than Algoma’s recommendations can cause rapid tool deterioration. Mill top and discharge flanges allow easy mounting of in-feed and discharge chutes or hoppers . So for my . 077 5/8 Edge Start 13 146 16. need a little help feeds/speeds in ar400. 4 - 62kW (83Hp) Stage V and Tier 4: Caterpillar C2. TV . Joined Aug 9, 2010. Liberal amounts of a good coolant are essential. Here's a setup for your Tormach 1100 speeds and feeds in steel (with the SFM recommendations by nutzilla above): Speeds and Feeds RPM 2670, IPM 20, DOC 0. 34 in depth of cut at 0. com website, you can access this tool online and open it in your browser. I have a 4. As a result, customers can expect longer-lasting wear parts in some of the toughest applications. In actual use, depending on the machine environment and workpiece material, significantly higher speeds & feeds may be achievable. 2. 15 250 0. Mechanical Properties Hardness 360-440 BHN Yield Strength 140 ksi Drilling with HSS bits isn't bad. 150” Speed 260 brazed, 330 throw-away Feed . For general profiling I like Maritool variable flute endmills and his speed feed chart is pretty well spot on. Note: In the recent Fusion 360 release, we finished replacing the Tool Library with the improved version. . Adjusting feed rate to about 3. zip (792 Bytes) Here is a version which has the Amana feeds and speeds copied into it — breaking this up and naming it appropriately by appropriate materials. Compared to E70T-4, they offer slightly lower deposition rates of up to 30 pounds per hour, but they offer a smoother welding arc and Charpy impact toughness properties. Tool: 1/64" flat end mill Feed rate: 59 in/min (1500 mm/min) Plunge rate: 15 in/min (381 mm/min) Spindle speed: 16,400 RPM Max pass depth: 0. Tool Library Cutting Data. When milling steel, the feeds and speeds will be all over the place since it depends on the grade of steel, the material of the tool, the depth and breadth of the cuts, the number of flutes, and so on. But as was pointed out a bandsaw cut will be perfectly adequate. The unit automatically recovers, recycles, evacuates, and recharges. 25x Cutting Diameter, when profiling less than . 0394 1. 008 lead alloy 10-20* 300-1000 . Using a ⅛” (. The angular velocity of the workpiece (rev/min) is called the "spindle speed" by machinists. 6 48 130 72 127 0. I'm predrilling it using a . Feed Rate f (mm/rev) H Type L Type G Type ACP300ACP300 ACM300 ACK300 DL1500DL1500 M Stainless Steel Steel P (High-speed Drilling) Cast Iron K (High-speed Drilling) Cast Iron K (General Drilling) Non-Ferrous N Metals Grade Work Material P Steel (General Drilling) ACP100ACP100 L Type P K G Type P K H Type P K H P G P M L. 2mm DoC. Increase the cutting speed (feed rate) until the quality of the part’s finish starts to decrease or the part is starting to move from hold downs. Thread starter JMG; Start date Apr 30, 2012; Replies 0 Views 1,681 J. According to the chart, if the sum of runout and chipload is just 0. Machinability can help us to determine whether a type of material is suitable for CNC machining services. 5 x Cutting Diameter, for deeper slotting reduce feed and speed profiling with Axial depth up to 2x Cutting Diameter and Radial Depth of . I have a 4. 0625" wide by half inch deep. Feed Rate = RPM x Chip Load x Number of Teeth. Cut about 20% stepover amount in your toolpath settings. No chart will ever. The phrase speeds and feeds or feeds and speeds refers to two separate velocities in machine tool practice, cutting speed and feed rate. #5. , for its heat-treated plate. It's the ME Consultant one if any of you have seen it. Workpiece Material Brinell Hardness (BHN) Morse List No. 2-0. Formula to Calculate Surface Feet Per Minute (SFM): SFM = 3. Work at a slower speed and higher feed than if you were machining 304. 06 0. They use multiple charts, add columns and rules of thumb to cover a few more variables–maybe 4 to 6. al. Formulas for external thread milling Calculated. I’d like to cut some hardwoods like mahogony with. Our G-Wizard Speeds and Feeds Calculator can computer proper Speeds and Feed Rates for Spade Drill Bits in a variety of materials. 0063 (Pitch / 8) Z axis move for full thread 0. The base steel around the weld rapidly heats and cools during welding, resulting in a heat affected zone (HAZ) with high hardness. . That is a chipload of 0. Surface Speed (SFM) FEED PER REVOLUTION BY DRILL DIAMETER (IPR) 1/16" 1/8" 1/4" 1/2" Low Carbon Steel 1018, 12L12, 1108, 1213 ≤ 120 5374 250 0. 0mmx10 IPM feed. A2 is a nice material. 25" bit at 500 IPM and 1/2"+ DOC with ease. 5deg pressure angle. milling speeds & feeds carbide tipped class of materials material application - mills and saws brinell surface feet per minute (sfpm) inches per tooth (ipt) non-ferrous (soft) aluminum alloy - wrought 30-150* (500kg) 1000-2000 . 0mm pitch tap. 15% and below creates ductile steel with unbreakable chips. The first plate I cut was fine the angle was fine, but it looks blistered. We have found that the optimal cutting RPM for acrylic with the recommended O-Flute bit above is 18,000 RPM. 001 to 0. calculate from the cutting speed of the closest diameter. com Cut about 20% stepover amount in your toolpath settings. They use multiple charts, add columns and rules of thumb to cover a few more variables–maybe 4 to 6. Results: Cutting conditions and Grades. The premier source of tooling, parts, and accessories for bench top machinists. Now I usually trust FSWizard for flat end mill and twist drill feeds/speeds. 2. I have some 5/8" solid carbide endmills that i would like to try a trochodial tool path with, basically just for practice and to test this kind of tool path. For the feed rate per revolution, please set up within the recommended feed rate of the closest diameter appropriately. Therefore, it only covers 2 variables. AR400F is quenched and tempered through hardened wear resistant grades of abrasion resistant steel plate used for high impact and abrasion resistance. Its tangential linear equivalent at the workpiece surface (m/min or sfm) is called the "cutting speed", "surface speed", or simply the "speed" by machinists. 0625" wide. Julien (Julien) November 9, 2022, 7:45am 2. 02 mm) Tool: 1/32. Sophisticated feeds and speeds software lets you master a lot more variables than you could manage by hand. For the feed rate per revolution, please set up within the recommended feed rate of the closest diameter appropriately. 16,000 (RPM) x 1 (cutting edges) x . AR400F has a minimum Brinnel hardness of 360. 2020. Speeds and feeds charts for end mills from The Carbide End Mill Store. I'm needing to machine several stepped pockets in some AR400 steel plate. 007 chipload per tooth = 168 IPM. Will take about 5 hours overall. The machinability rating attempts to quantify the ease of machining of a range of metals. Depending on the material, variations of the feed rate may be necessary in order to secure desirable results. 0625" wide by half inch deep. Throw away those old speeds and feeds charts and pdfs. I drilled a 1/4" pilot, and then drilled to 1-1/8" with a 118 deg 1/2" shank S&D bit. In addition, the correct cutting tools are also required, and HMT have. I don't do much machining on anything but aluminum, delrin, and the occasional mild steel or brass so I'm not too up on hard machining. 5" wide x 20" long 1" thick AR-400 plates that need a centered slot cut completely through them 3. There a few main criteria you need to be familiar with when starting with feeds and speeds: RPM: This is how many revolutions per minute your tool is spinning. Start conservatively and increase speed and feed until drilling cycle is optimized. The speeds and feeds should be calculated before you ever turn on the machine. I'm. It's on an already built unit so I can't substitute. 052 drill bit (#55). I have a 4. pak Cast Iron. Machining AR400 steel plate. They give you ranges that are tough to interpret when you just want the answer. Feedrate: This is how fast the machine is moving on any of. Feed Rate = 25000 * 2 flutes * . To machine 304 stainless steel, you should machine it at slower speeds. com A collection of really good online calculators for use in every day domestic and commercial use!SPEEDS AND FEEDS . 254 RPM = 7. A chart is only 2 dimensional. Cermets should not be used for rough copy turning. Material: Feed Rate (mm/ min) Plunge Rate (mm/ min) Step Over:For deep hole drilling reduce speeds by 10% for 3xDiameter, 20% for 4xDiameter, 30% for 5xDiameter and 40% for over 6xDiameter. 5 mm) thick plate, and at least 110 ksi (758. Calculate the Speeds and Feeds of Carbide End Mills, Diamond End Mills, and Plastic Cutting Carbide End Mills with these General Machining Guidelines. If you are wondering what are feeds and speeds with CNC routers, and why are feeds and speeds important, this video tutorial explains feeds and speeds for th. Flood throughout the work, if possible. 590 mm 1/8 in. steel, hard alloys and carbon steel at medium to high cutting speeds. Using an RPM of 15,280 would give a feedrate of 122 in/min. , for turning on a lathe). , for its heat-treated plate grades, depending Grade 316 is more prone to work hardening, so you need to invest more effort into preventing that. . I will be using it primarily to cut guitar bodies (basswood, alder, mahogany…etc). Alpharetta, Georgia 30004. Does anyone know what the proper speed and feed and depth of cut should be for a gear cutter with the following specs: #3 cutter. Worked fine. Cut dry, air blast or MQL with your TiAlN carbide mills. 95. Overall height of 14. Alcohol based coolant works well; if not using coolant, then max surface speed is 200 ft/min. I would not generally try to make the cut and finish in one pass, I do the rough cutting first at whatever feed rate and depth I can get away. 3. Water based coolant works well; if not using coolant then max surface speed is 125 ft/min. It offers higher deposition rates than GMAW, handles dirtier plates, and uses lower cost 100% carbon dioxide. I need to turn AR400 Plate with a 5° angle on the edge. Surface Speed (SFM) cutting tools, speeds and feed rates. Uncoated Cobalt End Mills: Increase speed by 25% For Lighter Radial Depths-of-Cut: Higher range of recommended surface speeds should be used For Greater Radial Depths-of-Cut: Lower range of recommended surface speeds should be used For Slotting Applications: Speeds (SFM) should be reduced approximately 20% of lowest range valueThe YouTube feeds and speeds were worked up by @wmoy as an example for the purposes of the video. 82/tool diameter. And, depending on the machining application and workpiece material, feed rates in excess of 0. 5. Recommended Feed Rate: . I decided a good place to start would be to look at manufacturer data on the end mills I have, and get a ballpark using one of the calculators. Therefore, it only covers 2 variables. The "feeds". The Carbon content of AR400 steel is only 0. Speeds and feeds for your austentic stainless will suffice for annealed A2 machining. Easy Speeds And Feeds only serves as a starting point and educational site. I have a 4. Click Here to find the right drill size for you reamer. The HyPerformance ® HPR400XD ® plasma system has been designed and built for maximum performance and productivity in X-Y, bevel, and robotic cutting operations. 6. Number of Teeth = The number of edges, facets, or flutes. 3. The next issue would be the feedrate. A line drawing showing some basic concepts of speeds and feeds in the context of lathe work. 8 33 136 38 133 0. Start off using an RPM derived for the chip load for the material being cut (see charts). 85 KBAR 400 plate. I have some 5/8" solid carbide endmills that i would like to try a trochodial tool path with, basically just for practice and to test this kind of tool path. $69. [ Get G-Wizard Feeds and Speeds. I only have a few to make and no time restraints, so this is a. Alpharetta (Atlanta Plate Processing) 2005 Grassland Pkwy. Workpiece Material Brinell Hardness (BHN) Morse List No. Keep in mind that slowing feed also needs to adjust RPM to maintain chipload. The Tensalloy ™ AR400 wear-resistant steel plate is a steel that provides greater impact strength than our other common heat treated alloys. A tough and highly wear resistant grade. The equation for the feed rate is: \small f = N\times C_\mathrm {L}\times n_\mathrm {t} f = N × C L × nt. The maximum cutting speed depends on the type of coating on the tool and the maximum temperature it can safely withstand. *The RPM and Chip Load that automatically populates in this calculator are the factory suggested parameters for running the desired tool. 001" per revolution for every 1/16" of drill diameter, plus or minus . 020″! To select a V-Bit in G-Wizard, treat it like an endmill. 15 250 0. 025 IPR is a typical number. Annular Cutter Speeds and Feeds Calculations (Manual Machine) [RETURN TO QUICK LINKS] The highest deposition rate gas-shielded flux-cored wire is E70T-1. Hey guys, I've had to build alot of aggergate discharge shoots over the last 20 or so years and most of them were built. But running work at proper feeds and speeds is the best way to cut clean holes and tap stainless steel most efficiently. I was hoping someone could get me in the ballpark with a feedrate. I was thinking of starting at about 1200 RPM and . 4 - 62kW (83Hp) Stage V and Tier 4: Caterpillar C2. One solution is using sharp tooling and replacing tools the moment they start to wear down. The machinability rating attempts to quantify the ease of machining of a range of metals. I have some 5/8" solid carbide endmills that i would like to try a trochodial tool path with, basically just for practice and to test this kind of tool path. If you’ve ever looked into CNC cutting tools, you’ve probably heard the term “feeds and speeds”. 0015 0. I assume the spring-loaded holder helps cushion the V-Bit's delicate tip from undue shocks and lets it sort of find its own feedrate that works by backing off the depth if there is too much force involved. 08-30-2008, 06:56 PM. 001" (0. Machine type, horsepower, spindle speed limitations, tooldholding & workholding devices all may impactHere is a diagram showing the effective diameter for a 90 degree V-Bit with a 0. 050 sfm 215 feed . TV . 012 ipr should be avoided, because thicker chips may damage the cutting edges. Solid Carbide Drills Speed & Feed Recommendations TECHNICAL INFORMATION . A588 is known for its atmospheric corrosion resistance thanks to a natural patina of rust that forms when exposed to outdoor weather conditions. Exclusively Distributed By Industrial Supply Co. 16 RPM • Feed per flute • Number of flutes Feed rate for thread milling 12. It takes multiple charts to cover maybe 3 or 4 dimensions. Cermet Evolution Linear feed 54. 2 225 128 320 125 0. pdf. 002 - . 5 IPM feed Which is fine, most controllers handle . Weldox 700 Weldox 900/960 Weldox 1030 Weldox 1100 Hardox HiTuf Hardox 400 Hardox 450 Hardox 500 Cutting speed, vc [m/min] and Feed rate, f [mm/rev] v So I used the search function and dont think this has been posted and the one post nobody really answered the question. The formula for cutting speed (sfm) is tool diameter 5 0. 82) / Diameter of the Tool. Originally posted by Sonora Iron View Post. I didn't think I would be, but I admit I'm totally overwhelmed at learning feeds and speeds. If you’ve ever looked into CNC cutting tools, you’ve probably heard the term “feeds and speeds”. They are 1/4 " thick, and stick out 5/8". AR600: 570-625 BHN Typically (less common, but available) Therefore, what does this mean in terms of usability? AR400 can be used as a basic component or as a liner in all types of material handling equipment. at 20 IPM with a . *The RPM and Chip Load that automatically populates in this calculator are the factory suggested parameters for running the desired tool. Milling operations. I'm interested in seeing what your experience is with using different speeds and feeds. Its tensile strength ranges from 155,000 to 180,000 psi, while its Brinell hardness ranges from 360 to 440, depending on the thickness of the steel. 125”) diameter cutter instead of a ¼” (. 2 - 55kW (74Hp) Determine the spindle speed (RPM) and feed rate (IPM) for a milling operation, as well as the cut time for a given cut length. I only have a few to make and no time restraints, so this is a. For hard metals reduce cutting speed. Hardox® 450 is an abrasion-resistant brand with a hardness of 450 bhn. Consult a Monitor or Manager for any/all other foam materials. The drilling sessions should be short, with adequate pressure. See the gitbook link in Will’s post for explanations of those. Feedrate about . Chrome levers for half-nuts, tool post and tailstock. Example for the 1/4-20, you should use . The term "feeds" refers to the feed rate or the relative linear speed between the tool and the workpiece. How do you calculate speed and feed? Speed (RPM) = (Surface Feet per Minute x 3. Category overview ; List of all discussion forums ; The 100 latest forum topics ; IndustryArena. 5. Please reach out to our customer support team! 855-828-2106. Drilling Speed and Feed Calculator. Give us a call at 800-348-2529 or leave us a message. 061 3/8 0. 150” Speed 260 brazed, 330 throw-away Feed . When you go deeper per cut you need to change the feed rate a little since the cutting edges now do more work, vs tip only when doing 0. 001″–a thousandth of an inch. I wouldn't worry so much about trying to push any limits unless you have the time to experiment a bit, and record some data for future reference. Remember that when you increase the depth of cut you need to reduce either the width of cut or the feed speed to keep the same cutter load. More products like this. 5 85 129 122 127 0. AR400- better for impact applications, AR500- better for sliding applications. The main cylinder has a mid-trunnion mount for superior strength, balance and longevity. 0 amps is almost 700 watts, so about max hp on this machine !!!! Anyway, stalled the drive a couple of times at 3. 4-3. Imperial: RPM =12 x cutting speed (feet per minute) / pi x D (inches) D is your tool’s diameter in inches. However, the recommended surface. I have some 5/8" solid carbide endmills that i would like to try a trochodial tool path with, basically just for practice and to test this kind of tool path. All I had for my mill at the time was a 1/2" chuck. Cobalt alloy has higher melting point than other HSS alloys. Carbide – Depth of Cut . Choose either HSS or Carbide, depending on what material your V-Bit is made from. Forum - The expert community . 010″ depth of cut: The effective diameter in an 0. 4x10 RPM = 1. Handwheels: 90 mm OD, 8 mm bore. (mm per tooth) Z= RPM, the speed at which the cutter revolves in the spindle. I only have a few to make and no time restraints, so this is a. Now, a typical 1/8″ carbide endmill might have a total chipload allowance of 0. MMPM = RPM X number of teeth X CLF X MMPT. 061 3/8 0. The feed rolls on each side have these worn gripper strips that need replacing. I have a customer that has a large wood chipper. I have a 4. Carbon Steel/Alloy Steel ~750N/mm2. flatheadkid said: Hello. AR400 steel is known for its exceptional mechanical properties, particularly its high tensile strength and hardness. 008 magnesium alloy 50-90* 750-1500 . 005" per tooth or probably about 50 ipm on your machine. Start conservatively and increase speed and feed until drilling cycle is optimized. com S3_feeds_250. Adjust RPM & Feeds after Setup to achieve Optimum Tool Life. Horizon Carbide Grades are Designed to provide Long Tool Life at Higher Speeds and Light Feed Rates. Speed and Feed Calculator for Drilling and Milling,easyspeedsandfeeds. Category overview ; List of all discussion forums ; The 100 latest forum topics ; IndustryArena. 030" radial step at 3000 rpm and 30 ipm. Gradually bring the feed rate up while monitoring chatter and spindle load. I have a 4. Easy Speeds And Feeds only serves as a starting point and educational site. 40:Feed Per Tooth is based on. Then we use the cutting speed from the table to calculate RPM with one of the following formulas: Metric: RPM =1000 x cutting speed / pi x D (mm) where D is your tool’s diameter in mm. I wonder what people use 30k spindles for when any speed I've come up with are less than 3000rpm. 1. 5425 N Whitaker Road. Chip Load = The amount of material removed, per revolution per cutting edge. 0625" wide by half inch deep.