Speeds, Feeds, Power, and Force (SFPF) Calculator History

[gmack (Gerald Mackelburg)]

@wmoy

It’s also extra heat at that higher SFM. I’m not looking to set any land speed records with the material monday recipes. They’re supposed to be “safe” starting points for people, I’ve tried to make that clear by reminding people in the videos every couple episodes.

Furthermore, I would absolutely NOT want to use a 0.00013" chip load in aluminum. That worked in steel because the SFM was so low using small diameter tooling.

Also, that video did not take into account chip thinning. Have you seen the HEM video I put out? https://www.youtube.com/watch?v=wnv6Z72Ql24

The recipes certainly are plenty safe, but IMO you’re really only demonstrating/using a small fraction of even the “stock” machines’ capabilities!

I’ve cut a lot of 6061-T6 aluminum on my 3450 RPM miter saw with a 12 inch 120 tooth blade. Even with a likely unrealistically high feed rate of 50 IPM, that’s a chip-load of 50/3450/120 = 0.00012" at 3450 X 1 X Pi = 10838 SFM (HSM?).

At less than 1.05 lbf and 27.9 Watts, both of your HEM examples are plenty safe too. The 3 flute example did not require any extra force or power because the MRR remained the same as that for the 1 flute. Weren’t you using a (“1.25 HP”) Makita 0701 router?