![]() ![]() This is a valuable piece of information that can then be used to calculate new set ups. The chip load is a measurement of the thickness of material removed by each cutting edge during a cut. Therefore, tooling damage may still occur and use of this calculator does not provide any warranty against tool breakage. These feed rates are only a recommended starting point and may not accommodate all circumstances. The calculation below does not apply to thicker material or tools with long cutting edge lengths. This is a valuable piece of information that can then be used to calculate new set ups.Ĭhip loads are based on material thickness of average size for cutting edge length of tool. 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 higher the friction generated between the tool and the workpiece. Usually, the higher the RPM, the better the surface finish becomes. The general operating RPM for tooling contained on this site is between 10,000 and 20,000 revolutions per minute. ![]() Metric conversion: Divide inches per minute by 39.374 (example: 300 inches per minutes divided by 39.374 = 7.62 metres per minute) RPM = feed rate / (number of flutes x chipload) I’ve been squirreling away bits and pcs for future reference which some of ye might find useful, well hopefully someone will.įeed Rate = RPM x number of flutes x chip load Does that seem right given the rigidity of the Z-axis on the Longmill? Is it an issue of avoiding any flex and deflection? That’s just slightly more than 1/8"/second. ![]() 15 inches/second, which is far slower than I believe I plunge by hand without any issues. The plunge rate also seems a bit too conservative to me. Why such a shallow step down? If doing carving or detailed 3D work I can see it, but for profile and pocketing or larger items it seems very shallow? I’m hopeful 3/8" would be feasible, and of course it have a dramatic affect on overall cut time. The step down of 1/8" seems too shallow to me. I have a feeling 80 might be more in line with what the Longmill could do and more appropriate for it’s design, but given that it’s almost double the listed speed (acknowledged as a conservative place to start), I’m curious if 80 ipm (2032mm/min) is possible on the Longmill? I turn up my recent cut to 180 ipm before the chip load and sound was ideal. 80 ipm for Plywood can be far too slow on larger machines. There are some interesting tid-bits in this older Wired article: You Suck at Using a CNC Router | WIRED But like all information on CNC feeds and speeds, I detect some comments that I’ve already experienced are incorrect. I saw the reference to the lead screws being a drag on overall speed due to the reduction factor they have, but I’m hopeful there is more juice available? ![]() The loaded cutting speed I can’t really comment on as I haven’t used the machine yet, but I am hopeful it can go to at least twice that speed? 47 is on the slow side for sure. These seem quite conservative to me (which makes sense), but are they? General plywood is listed at 1200mm/min (~47 ipm), with a 250mm/min (~9.5 ipm) plunge rate, and a 3mm step down. There are some Sienci published feeds and speeds available for wood here as a general starting reference: 1. I’d like to get a sense of the capabilities of the Longmill for cutting 3/4" Baltic Birch, which is often used for shop projects, jigs and furniture making. ![]()
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