Shapeoko vs. Aluminum round 2, why don't HSM best practices work?

[gmack (Gerald Mackelburg)]

@Vince.Fab

Love all the new inputs and thank you for your effort in keeping it up to date! However I couldn’t get the feed by force working so if you have tips I’m all ears.

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Thanks for the feedback and actually using the thing! I fixed the feed force problem and a couple others and will post the latest version on the SFPF calculator thread shortly. What forces do you like on your various machines?

@Vince.Fab

Also I’ll try to get you some 6061 measured K factors soon.

I added another sheet to the workbook that replaced the HF Spindle with your VSEC BLDC motor. If you use it for that you’ll get more accurate results. The increase in motor current when cutting should provide a good measure of actual cutting torque (provided it’s accurate). That, in conjunction with router cutting speed, will give cutting power. I suspect that the VSEC tool’s “Power” is actually VSEC input power.

@Vince.Fab

Imo a 0.00059 chip thickness by KennaMetal is bonkers

I don’t know about that, but its the lowest chip thickness their calculator comes up with. I posted that on the SFPF calculator thread along with matching pictures of the three different spindle type options the latest workbook offers.