Founded in 1970 as a general-purpose machine shop, this company was involved in making repairs and special parts for the furniture and woodworking industry. These files can be loaded into Vectric software (version 8.5 and later) including Aspire, VCarve, and similar software formats. 0000015855 00000 n The bit profile produced by Whiteside feature consistent quality, long-lasting performance, and superior cut found only among the industrys finest brands of router bits. Perhaps you catch one of Carbide Processors' sales on Whiteside Router Bits; you receive your American-made bit for your wood application and a nice note for choosing us, to serve you. Please send a link if you have (although Im in South Africa). xref CNC Spoilboard Surfacing Router Bit 1/2" Shank, Slab Flattening Router Bit 304806024256. . For bits 1/4 inch and larger you will probably not break anything starting out at 0.01. no experience cyber security jobs It is a great product to achieve those fine details. 0000002751 00000 n I would suspect that any bit larger than 1/4 at the head is going to give the makita issues in the long run. You can turn ordinary dimensional lumber into a beautiful piece of furniture in a very short time. 1954 23 Speed & feed settings vary a lot from machine to machine, a lot of it is to do with how rigid the CNC machine is. together tech enthusiasts, crafters, educators across the globe. = 3.142 in. This is an excellent selection of bits for someone who is starting out and because of their premium carbide construction, they are sure to last a long time. The bit will take too big of a bite and move my board. Do not leave the tool running. Its simply too much couterforce with such a large diameter bit for the weak motor, at least when you try to do deep pockets. Agree with above. The same applies to chip load if the recommended chip load is 0.1 mm/tooth the RPM, feed or number of cutting edges may go up or down to maintain the required chip load. I just tried out an Amana bowl and tray bit #45982. They are represented on the screen by lines and curves which represent the path of the bottom center of the cutting tool. YMMV. Top Quality, Industrial Grade Router Bits. Spindle go 5k to 10k. 0 - Make sure you have the right router bit for the material to be processed, - Look up recommended settings when programming for a new type of material of router bit, - Check with your machine supplier if you arent achieving the expected quality or productivity, - Make sure your collet is not worn and the tool is fitted correctly, - Start with lower feed and plunge rates if not sure to avoid potential tool breakage or machine damage, - Forget that doing some test cuts on a spare piece of material is a good way of checking settings before running your main program - Use worn or damage router bits which can cause overheating and poor cut quality - Continue cutting if you hear an unusual cutting noise. trailer In todays world of Internet news and online content, we found that more and more professionals researched a large majority of their major power tool purchases online. I have a Whiteside Router Bits 1570 Point Cutting Round Over Bit with 3/16-Inch Radius 3/8-Inch Cutting Diameter and 3/8-Inch Cutting Length that I've been using with my Seadek tri-color 9mm EVA foam and it's been doing fairly well, definitely requires some cleanup work with a dremmel but I've been experimenting with feeds and speeds 575mm feed/ Shapeoko I use a bowl bit quite regularly, it works great! Most CAM software provides what seems to be an insane number of controls and options in the toolpath dialogue. 2-inch diameter bit = 3.142 x 2 in. There are over 100 Whiteside router bits to choose from and you can be sure these are of superior quality and high industry standards. 4) Disconnect power when changing bits or making adjustments, and always leave the power disconnected when not in use. There was a horrible smell during the cut and once completed, i noticed that it wasnt just the wood i could smell, but my Makita router had started smoking and was extremely hot to the touch. You could also use 1/4 (6.35 mm) or 3/8 (9.525 mm). Find a special something for the makers in your life. If you are someone without a budget then, of course, Freud is recommended but if you are looking for an economical option Whiteside should be your go-to. Usually in normal use of a hand trim router you dont use bits larger than 1/2 (12.7 mm). 6) Whiteside Machine Company assumes no responsibility for defects, damage, or injury (direct or indirect) caused by misuse, abuse, alteration or modification of any product (including sharpening). For assistance setting up your milling program, contact a Dapra applications specialist or call (800) 243-3344. It is surely a one-time investment because of its durability. Showcasing amazing maker projects of 2022, Ryan McKibbin is a lecturer and the Fabrication Labs Director at Catholic University's School of Architecture and Planning where he teaches Furniture Design and Digital Fabrication. Ive had issues in the past with burn marks on my wood duering the ramp moves, but then nothing during the full speed cut. Customary units are uncommon in Europe, and at least as far as I know, elsewhere too (except USA and Canada). Router bits running faster than their RATED SPEED can break and fly apart. Another factor is depth of cut. http://architecture.cua.edu/res/docs/Fab%20Lab%20Resources/feed-rate-chart.pdf, Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. Its possible to damage your spindle by pushing it too hard, remember to always warm up the spindle for at least 10 minutes before making any cuts. If an extra long router bit is being used, the chip load should be decreased.For most material that you will be cutting on a CNC router you will typically set the RPM between 12000 and 24000, and adjust your feed rate to obtain the required results. For the Whiteside 6210, the link from the image goes to the correct amazon link, but if you click on the link displaying the price . 5k-10k on the spindle seems low. I'm buying another one, kinda says it all. ch [email protected].Shipping Weight: 1 lbs. In your search for the right router bit, you will come across the bits produced by the Whiteside Machine Company. Are the default jerk settings on the 1f working for most people? What gives? Such an important tool in the arsenal. Freuds computer-balanced bits offer vibration, chatter-free operation, and an anti-kickback design. Cutting about 14mm deep pockets and using my 1-1/8 Amana 3 flute surfacing bit to hog out the bulk of the material. If you carry the units through, you get in^2/minute. The speeds and feeds calculator has two modes of operation: preset mode and manual mode. If an extra long router bit is being used, the chip load should be decreased. Was thinking of time saving. It is difficult to decide which of these brands are good as each of them have their own advantages and disadvantages. As you work your way toward the sketched lines, try making both clockwise and counterclockwise motions and notice that one direction provides far more control and accuracy. Only use the .tool file for the specific Whiteside part number. Keep in touch. You can also download RhinoCAM from MecSoft. The best way to sort out speed & feed settings is to experiment yourself until you find settings that work well for you. Will be running tests , but as a starting point. Feedrate ? = 9.42 in. Whiteside has been winning for over 30 years and here are some of their top router bits that have brought in their repeat customers. You will typically start off with the calculated feed rate. We mainly sell to U.S. rather than to buy there: Of course here inch collets are also available (for both trim router (UK version) and ER spindles) for those who want to use milling bits from the USA, but its not that common. Understand Surface Speed and Chipload to dial in your Sweet Spot. Lets start with a few different circumferences: Circumference = x (router bit diameter). Most machine controllers allow you to adjust the feed rate while a program is running and by listening to the sound the cutter makes this can be a good way of optimizing the parameters.Feed rate is calculated using the following equation:Feed = N x T x ZN = number of cutting edges (flutes)T= chip load (chip per tooth) is the amount of material, which should be removed by each tooth of the cutter as it rotates and advances into the work. Your choice here will be recorded for all Make.co Websites. Makita RT0701C trim router Instruction Manual. We recommend putting on your safety glasses even when youre just walking through your shop (how often do you say, oh Im just going to do this or that really quick?). Theres one key thing to note about Pro Tool Reviews: Were all about the professional tool user and tradesman! There are also several factors to be considered when choosing the proper RPM and feedrate.The feed rate used depends upon a variety of factors, including power and rigidity of the machine, rigidity of part hold-down, spindle horsepower, depth and width of cut, sharpness of cutting tool, design and type of cutter, and the material being cut.To obtain the optimum Chipload, you must consider these variables, along with the machine and materials you intend to cut. 1-800-535-4486 Join Our Email Program! If it is too hot, increase the feed rate or lower the spindle speed. Every bit is a little different and there is a wide range of densities in solid wood and different sheet goods. Never use dull or damaged cutters. Sometimes it can be more efficient to use a higher feed rate and two or more passes rather than a single cut at a low feed rate. You will have to adjust your depth to achieve the desired results depending on the type of material and size of cutter. black panther 2 box office collection worldwide till now. hb```b``g`2612 PIAm3kcKT c;aZLt3`Ln$CKg&P8*l, :3o8~+Mck*&^{|n;WmW0Ai@g8>KmC#8PRQ&U6.h1d6AXSyp&zE`!%%(,66`+dRb@U,B0>>rY(1R5p*QHbW"$X{eDY1dyp`@ ? h1 04u\GMyC. Pocket toolpaths etch the surface of the material, while profile toolpaths cut all the way through. Thats a large endmill, so youll want to move reasonably quickly, and at a suitable RPM. For most materials there is a recommended chip load.If you are running at 18000 RPM using a 25mm cutter with two flutes, and a recommended chip load of 0.1 mm/tooth:Feed = 2 x 0.1 x 18000 = 3600 mm per minIf the RPM were increased to 24000 RPM the new feed rate would work out to be:Feed = 2 x 0.1 x 24000 = 4800 mm per minBased on this equation, as RPM increases, feed rate will also increase if all other settings remain the same. For a rough guide, here's a typical maximum router bit speed chart: Router Bit Diameter Maximum Speed Up to 1" 1" to 2" 2" to 2-1/2" 2-1/2" to 3-1/2" 22,000 - 24,000 rpm 18,000 - 22,000 rpm Whiteside Router Bits Ranked #1 By Fine WoodWorking The following link can be used to access Whiteside's Library of Vectric .tool Files for our most popular CNC bits. Dont get too carried away with the numbers, use your common sense and trust your gut. Not sure if its incorrect jerk setting or what I should be looking at, but on short toolpaths with high feed Rate, my machine goes completely off path. Doc .20 23%stepover. This goes for grinders and grinding wheels as well. Here is a link with a corrected and more detailed explanation. %PDF-1.4 % Click "Import a tool database", select the file you just downloaded, and import it * .vtdb suffix file Download (Updated to 202201125) You are welcome to use my feeds and speeds chart. There are a number of reasons for this, but most importantly taking the time to understand 2D machining allows for a much better understanding of the 3D parameters. A typical Sweet Spot looks like this schematically: The green areas reflect ideal Sweet Spot matches for a material and cutting conditions. I have a 1" rocker bit which is similar. 0000005228 00000 n If so, any pointers? Set the bit so that it cuts no more than 1/8 of an inch deep per pass, and be sure to secure the plywood to your table. For use in small CNC machines. These will be stored in your browser only with your consent and you have the option to opt-out. Using your feedback, I was able to surface my spoilboard. 14 people found . As with any bit, cut at the right depth and right speed and you'll prolong the lifespan even more. The most important concepts to take away from the handheld router experiment above are: spindle speed, feed rate, step-down, and step-over. New replies are no longer allowed. Rockler bits are made with high-quality ISO K10 and K20 carbide and are sharpened with 600-800 diamond abrasives. 0000005178 00000 n Pro Tool Reviews is a successful online publication that has been providing tool reviews and industry news since 2008. However, its incredibly important to do so when operating high-speed rotary tools. Milwaukee MX Fuel Cordless Threading Machine, HART 20V Brushless Drill Driver Review HPDD26, John Deere Lawn Tractors We Compare All Models, Milwaukee High Output vs DeWalt FlexVolt Batteries, How to Use a Multimeter or Voltmeter The Most Common Tasks, Hilti Nuron Power Tools and Battery Technology Hands-on Testing. This is a similar symptom to your router speed being too fast, albeit without the burning or additional damage made to the wood. document.getElementById( "ak_js_3" ).setAttribute( "value", ( new Date() ).getTime() ); See our Privacy Policy and Terms & Conditions. (Please refer to the manufacturers recommendations and keep in mind the speeds they suggest are maximum): Generally, the rim speed will be around 100 to 120 miles per hour. For one, it can actually burn the wood. I was getting a lot of chatter and stopped the cut. The chatter is likely due to a lack of rigidity, rather than a feed/speed issue. 0000002034 00000 n Feed rate 80-120 IPM at .1-.15 DOC up to 50% stepover To obtain the optimum Chipload, you must consider these variables, along with the machine and materials you intend to cut. These tools are coated with our proprietary high performance Astra coating that allows higher speed & feed rates as well as extended tool life & increased lubricity. Bob Warfield has added woods in the material list of GWizard. To wrap up, the quality of Whiteside router bits affect the quality of the cuts you make and ultimately the overall outcome of your project. However, suffice it to say its an unsafe speedfor both the wood and the useron the larger bit. A liberty-loving, sensible, God-fearing options trader by dayAdam Spafford is known for his quick wit, easygoing demeanor, and readiness to lend a hand when called upon. Okay so what the heck am I doing wrong here then. A larger cutter will be able to handle a larger chip load. A celebration of the Maker Movement, a family-friendly showcase of invention and creativity that gathers 0000003653 00000 n Conventional milling or cutting forward is the most commonly used method. Avoid using bits while in loose clothing. The best way to sort out speed & feed settings is to experiment yourself until you find settings that work well for you. It's a dance between not going so fast that you create a bit that gets so hot you cannot touch it. You almost need to record the screen during the largest diameter cut for each and see what speed it was running at and compare surface of each outer ring. These bit profiles offer a high shear angle to produce fewer tear-outs and minimal chatter marks. You can put pencil squiggles on the spoil board to see if you have any shallow spots. - Forget that doing some test cuts on a spare piece of material is a good way of checking settings before running your main program, - Use worn or damage router bits which can cause overheating and poor cut quality. Router bits are used to shape your project so if they are off you can consider your project finished. Bosch Router Bits Review: Are these Router Bits Fairly Priced. 1-800-225-1153 Talk to an Expert Get advice on the latest products and help with your projects. Accept all everything to know about roofing Manage preferences. x 20,000 rpm = 62,830 in/min. Have definitely seen it done online somewhere so thought Id give it a go. These router bit fall short in terms of longevity. Another factor that affects chip load is the diameter of the cutter. Its helpful to make a chart so you can quickly find the numbers you are looking for. 0000000016 00000 n Fine Woodworking conducted an experiment by putting 18 top-of-the-line router bit performers through a torture test to find the top two bits. 0000000016 00000 n The fan speed is the same as the spindle speed, if you are running it at low RPM that will reduce the cooling of the router. Then use our FREE comprehensive technical support to help you optimise the speeds and feeds appropriate to your equipment and materials. In the furniture and woodworking circles, Freud is a well-known name and is said to be the business. feeds and speeds for whiteside 1372 bowl and tray bit Julien (Julien (Carbide 3D)) October 27, 2021, 7:48pm #2 Can you use a bowl bit for juice grooves.? Milling Cutter Information Insert Diameter: in. When we created our circular ash table, we used multiple passes with a router to make the cut for the curved outer edge. Would love your thoughts, please comment. A toolpath is the user-defined coded route which a cutting tool follows to machine a part. If you are using the Makita RT0701C (110v) router that comes with X-Carves purchased after November 2021, the spindle speed varies from 10,000 RPM at the lowest setting (1) up to 30,000 RPM at the highest setting (6). There are many resources available to help determine suitable settings for particular material / router bit combinations. So I have to step down 3/8 of an inch. The most common issue you'll face is a choppy finish on the surface of the wood. Is anyone else using the same bit? CHAPTER 4. I ended up doing some tests for myself. Whiteside 703 1/4" SH Ball Nose CNC Router Bit Set Item 161282 $118.99 Add to Cart Quick View Whiteside 705 1/4" SH Starter CNC Router Bit Set Item 161283 $198.99 Add to Cart Details Add to Cart Details Make your designs come to life with the Whiteside 1/4" Up Cut Spiral CNC Bit. Learn More Customer Care Talk to a friendly customer care representative to help with your purchase. Powered by Discourse, best viewed with JavaScript enabled, 1024px-Metric_and_imperial_systems_(2019).svg, https://global.discourse-cdn.com/business7/uploads/onefinitycnc/original/3X/c/c/ccb20d837dd833b2a9949e295dcbab71a7107b09.mp4, Largest clearance bit the Makita router can use, is sold outside U.S. with 6 and 8 mm collet. These bits have high hook and relief angles for better chip ejection giving them superior edge quality. Therefore depending on the diameter of the tool, if the RPM and number of cutter edges stay the same chip load will increase with a larger diameter cutter, thus the feed rate will also increase. If we covert those into the more (American) familiar miles per hour (mph), we get: 1-inch diameter router bit rim speed = 59.5 mph, 2-inch diameter router bit rim speed = 119 mph, 3-inch diameter router bit rim speed = 178.5 mph. The idea is to step down by level first, so cut all your parts down to the first step, then to the second step and so on, leaving a thin layer of veneer at the bottom of each cut. That is why it is important to choose the right router bits from the right company. Their superior quality and cutting edge technology rank them highly. That same router, however, drives a 3-inch bit at 178.5 mph at the cutting edge. Helps reduce vibration and bit flexing. by cconway Sat Oct 06, 2018 4:25 pm, Post It only takes a little woodworking experience to find many ways to do things incorrectly. Begin the cut at the center of your shape and work out in a spiral-like pattern, this will provide support for your router if your shape is larger than its base. You want to make chips that when dropped fall to the floor rather than become dust that stays in the air. After a bit of experimentation I have found that a chipload of 0.005inches at 18000rpm resulting in a feed rate of 45ipm is optimal for my needs. Whiteside router bits are comparatively less expensive. There are many resources available to help determine suitable settings for particular material / router bit combinations. Would love to hear any advise please. Keeping in mind that we dont want to push the bit any faster than roughly 200ipm, if we wanted to use a 1/2 inch 4 flute bit, we could solve for spindle speed rather than feed rate. With this method the work is fed against the rotation direction of the cutter. CHAPTER 1. 0000012446 00000 n If I were cutting 3/4 in plywood it would actually measure somewhere around 0.72 inches, I would step down twice, 0.34 per pass leaving 0.04 inches plus 0.02 breakthrough for the last toolpath to remove. The many nuances of routing involve setting the right router bit speed. Whiteside 401 Basic Router Bit Set, 1/2-Inch Shank, 7 Pieces is a handy toolbox that comes with all the commonly used router bits. As the router bit diameter increases and/or the wood gets harder, you can take multiple passes with the router. I have been wanting to do some detailed 3d carves recently where the 3d object sits proud of the surface. This would include large vbits and bowl bits. Stepover 0.45in Use your ears too, the tool should sound good when cutting trust your gut. or is there some safe limit? Whiteside RD2075 Solid Carbide Downcut Spiral. 1/4 shank fits most routers and trim routers as well as CNC spindles. What I meant is that for milling pockets, I would consider a 1.125 (29 mm) bit as much too large. by martin54 Sat Oct 06, 2018 8:55 pm, Post I also keep plunge rate low when using end mills or ball nose bits. I would use an end mill (which is good for plunging) and a high speed. you with bogus information. Also the milling motor you use is not made for this, neither for such large diameter bits, nor for stationary use in a cnc machine. 0000001247 00000 n Freud is a highly dependable brand that delivers quality. They perform well but do not last long. I would run 23% stepover for that size bit. Therefore if chip load remains the same, and feed rate increases, either the RPM and or number of cutting edges must increase to maintain the recommended chip load.When calculating the feed rate for any material the chip load is therefore one of the most important factors to be taken into account because the chip load determines the amount of material that each tooth will remove, plus the load that each tooth will have to take. Their can-do attitude, excellent customer service, and innovative ideas put them on the map for top quality, industry-grade router bit profiles which are a complete line of carbide and carbide tipped bits that can serve all your needs. I was doing my pocket clearance with a 1/4 em - but I found it was taking a long time. Subscribe to the premier DIY magazine today, Community access, print, and digital Magazine, and more. Usually a depth of cut that equals the radius of the cutter is a good starting point when cutting non-ferrous metals. = 6.28 in. The spiral up/down gives a compression cut that eliminates fraying, splintering, and fuzzy edges. All rights reserved. The Edge Cutter is reader-supported website. 2023 Whiteside Machine Company. It can also exaggerate even the tiniest imbalance in the bit or router and cause vibration or a dangerous bit failure. The router can use the bit it just does not handle the mass well. It is the router bit profiles that make the router the most versatile tool. Avoiding a few broken tools or getting more life out of them might make it worth it to you. Milwaukee vs DeWalt Which Tool Brand is Better in 2023, Werner ProForm SP Full Body Harness with SwitchPoint, Milwaukee RedLithium USB 2000-Lumen Flashlight Review, Milwaukee Bolt Hard Hats, Lights, And Accessories. startxref Whether you are a beginner or professional woodworker, choosing the right router bits can be a daunting task, for a router is toothless without router bits. by LittleGreyMan Mon Oct 08, 2018 2:55 pm, Post If you feel the tool straining, or you need to really bear down on it, you need to make an adjustment. Starting out, dont worry too much about this. Here are some links where to buy milling bits: Milling bits in Imperial/U.S. Whiteside router profiles ranked high on the scale of sharpness and superior cut. 1976 0 obj <>stream When you buy through links on our website, we may earn an affiliate commission. As a beginner, it would be to start with MCLSs starter kits so you get the hang of how to use these tools at a reasonable cost but as you move from beginner to advanced a switch to Whiteside is recommended. A project collaboration and documentation platform. by ger21 Sat Oct 06, 2018 4:53 pm, Post The two other variables, step-down and step-over should be kept so that the cross-sectional area engaged with the material is no more than the radius times the diameter of the bit. only want to use bits that are in excellent condition. When machining softer materials or using a stubby router bit the chip load can be increased. As for the pilot holes, I want to do 1/8" pilots about 1/4" deep. (mm per tooth)Z= RPM, the speed at which the cutter revolves in the spindle. What I meant is approximately 8 mm. Look at the quality of the edge after the cut has been completed. There are also several factors to be considered when choosing the proper RPM and feedrate. The other method is climb milling or cutting reverse. Sometimes it can be more efficient to use a higher feed rate and two or more passes rather than a single cut at a low feed rate. It is relatively cheaper than Freud but more expensive than MCLS. A larger cutter will be able to handle a larger chip load. 0000021318 00000 n Generally the larger the bit the more scalping shows so running lower or less stepover percentages decreases the length of these scalping marks. For the sake of simplicity, let's assume a router speed of 20,000 rpm: 1-inch diameter router bit speed = 3.142 in. by cconway Sat Oct 06, 2018 4:59 pm, Post 0000015742 00000 n If you fail to adjust your router speed when moving from smaller to larger bits, you create a situation where you can end up cutting at 3X the speed (or more) of your smaller bits. Whiteside router bits also last a long time and are worth what you pay for them. We created a handy router bit speed chart for you to use as needed. BUT. For chip load in wood go .001 to .005". 0000018774 00000 n Whiteside 1572 Point Cutting Round Over Bit with 1/4-Inch Radius,1/2-Inch Cutting Diameter, and 1/2-Inch Cutting Length is a good router bit but has been criticized for its fragility. A trim router when the day is done is just a trim router. On all my bits I limit cut depth to .075 per pass to accommodate my machine which is not as ridged as the all metal machines. Raster area clears in 3" circles. Router Bits. 0000000774 00000 n One of the only reasons why it has a comparatively low rating. Dont think Im running my 1/4 em fast or deep enough so this type of clearance is taking a bit too long for me. Its not likely that wood dust will put you in the hospital, but a small shard of steel in your eye is something to reckon with. Also depth of pass should be maximum of diameter of bit. Even though there are formulas for calculating feed rates you will find that optimum feed rate will be determined from experience. Top Whiteside Router Bits . Find the best Woodworking Tools & Supplies at the best prices. mail me sunil_jangra07@yahoo.com crafts, science & engineering, design, and technology. We attended [], What is a scroll saw used for? Whiteside Ultimate Trim Combination Router Bit UDC9112is said to be a phenomenal bit. Powered by Discourse, best viewed with JavaScript enabled. Installation: 1. 2. At 16000rpm I would increase feed rate to 200ipm and plunge to 100ipm. endstream endobj 1975 0 obj <>/Filter/FlateDecode/Index[71 1883]/Length 61/Size 1954/Type/XRef/W[1 1 1]>>stream Grab a couple of router bits with dramatically different diameters to get a sense of the importance of rim speed. 2091 23 Make a quick sketch on a 12x12 piece of scrap plywood and use a -inch bit to cut it out. The router is rated at a max of 1.25 HP which might be insufficient for the load the bit is placing on it - you might be able to achieve the same material removal rate with a smaller bit and larger DoC value that will require less torque from the router. I guess with the purchase of my third machine I'll get it right. %PDF-1.4 % If the bit is too hot to the touch, increase the feedrate or lower the speed dial on the router. Click here for the Materials Guide. Do you have this bit? However, these reviews and ratings have been useful in making an unbiased assessment of the bits produced by this company. Never seen an 8mm bit- especially not for a 1/4 inch shank. He has an extensive knowledge in Rhino3d and related software. 0000002690 00000 n I have found that I cannot exceed 50 inch/min and get good results. x 20,000 rpm = 62,830 in/min. Whiteside is proud to supply the industry with our superior line of drilling and boring tools. . 0000012921 00000 n 0000020845 00000 n Get hands-on with kits, books, and more from the Maker Shed, Skill builder, project tutorials, and more. Some basic geometry quickly illuminates the fact that 1.5-inch diameter and 3.5-inch diameter bits running at the same RPMs have dramatically different rim speeds at the edge.