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CNC Bit Choice and Dust Collection
Question
Forum Responses
From the original questioner: I suppose the compression bits would be the same as a straight cut for dust extraction? What I'm curious about is if we'll have considerably less cleanup using upshear. I realize the potential for chipping, but likely anything with laminate we would just run upside-down so the upshear would actually be compressing it. From contributor Z: Do you have a dust shroud or hood around the base of the spindle? This will dramatically increase the dust extraction. If you don't, there are a few ways to make one yourself. I know that Woodworkers Wholesale sells them. From contributor K: If you always machine the parts with the laminate face down, you should use an upshear tool. This will pull the waste up, and if your dust collection is good, you should have a clean table after the program is done. One possible downside to using an upshear tool is that it will tend to lift small parts, so be aware of the part size. If you are cutting a double clad panel, I would use a compression tool, and if you still have considerable dust on the table, make a second pass with the upshear tool to clean out the tool path slots. From the original questioner: Yes, the CNC head has a hood and shroud. I suspect it is set up perfectly, except for the bits we are using. The straight cutter throws dust backward down the line it has just cut. Sounds like upshear would be quite efficient at pulling the dust up into the exhaust shroud. From contributor M: Good shot of chips being removed with a 30 degree upshear. The dust hood is in the up position for the shot, but you get the idea of what the helix on the tool produces.  Click here for higher quality, full size image From the original questioner: Thanks, that picture is perfect. I suppose I should also be sure our machine has suction for the dust. Right now we have a collector dedicated just to the CNC at the back of the shop. Calculations weren't done before we got the system, it was just conveniently available from one of our branches. I believe it is a 10 hp motor with one 12" galvanized pipe going straight to the CNC with about an 8' hose and 2 elbows. Does this sound about right? From contributor M: Wish I could help you there, but I am no expert when it comes to dust extraction. What I can tell you is we put a booster fan in between the router and the indoor collector at the back of the shop and that keeps our static pressure up pretty good. I'm told that static pressure and cfm are different, but both are important for extraction. Keep asking and someone is bound to know the answers. We just brought in a pro to do it for us. From contributor C: Yes, the upcut would extract the chips upward. But you could have a problem with the part lifting. We [Southeast Tool] recommend Slow Spirals. Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Have you reviewed the related Knowledge Base areas below? 
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