![]() ![]() Like surface speed, chip loads are often specified with a lot less detail. That doesn’t necessarily mean it will always make sense to run your spindle flat out. Since carbide is so much harder than these materials, very high rpms can be sustained. It’s common to use carbide tooling rather than HSS steel tooling because there’s often abrasive grit and other tool-life threatening impurities in these materials. Some manufacturers won’t bother giving a range, they just give a fixed rpm. Your goal is to select the lowest RPM possible for each application. This friction is what creates the mechanical wear on the cutting edge. However, the higher the RPM, the more friction is generated between the tool and the work piece. Usually the higher the RPM, the better surface finish becomes. The general operating rpm for tooling contained in this catalog is between 10,000 and 20,000 revolutions per minute. ![]() You will often see information like this quote from the Vortex tooling catalog (I added the bold for emphasis): Rather than quoting specific surface speeds (which are used to calculate spindle rpms) for each particular material, often just one rpm or a range of rpms is given. As a result, the Feeds and Speeds guidelines from tooling manufacturers for routers are often less detailed than those for metal cutting milling endmills. Soft materials like wood are a lot more forgiving than tough metals, so these materials have a much larger feeds and speeds “ sweet spot“. In particular, I want to show how to use our G-Wizard Feeds and Speeds Calculator together with your cutter manufacturer’s data to get the best results. In this post, I want to go through some of the special feeds and speeds considerations for CNC Router users. Their needs are quite a bit different than the average metalworker’s needs for machining feeds and speeds due to their chosen materials (mostly soft materials like wood, foam board, and plastics) as well as differences in their tooling (special CNC Router Bits including downcut and compression spirals) and machines (much higher rpm spindles, generally). We have quite a large audience of CNC Router users here on CNCCookbook. So same questions.Text:Spiral Compression CNC Router Feeds and Speeds from Manufacturer’s Recommendations I already saw perfect and fuzzy cuts within the same toolpath on a 10x5 piece of hard wood carefully selected by a luthier.īTW, with which tool do you measure your 24 long slot?Įdit: you were faster than me, wmgeorge. I generally wouldn't expect such precision with a 24 long cut. ![]() That's why several posters thought of a tool diameter issue or allowance. It's curious you had the same error in X and Y sizes. the cuts are different, and a g-code comparison will enlighten you the cuts are identical, which demonstrates it's not a software problem Not another tool with the same reference: physically the same tool. Not another board of the same wood, which may react differently. Perform all the tests (including V-Carve) as quickly as possible to be sure you have the same conditions (humidity, temperature, …).Īnd when I say the same material and the same tool, I mean exactly the same. Cut the same material, with the same tool and measure immediately after cut. So generate *exactly* the same cut with these programs. The question is not "why is the cut too small with V-Carve" but "why is the size not correct while the G-Code is" Bill, pretending V-Carve is the origin of your problem when V-Carve outputs a correct G-code is a dead end. ![]()
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