Feeds, Speed and Chip Load Questions

OK. I’ve checked ou the video they put up and it was most helpful. I’ve downloaded the spreadsheet and that actually makes sense.


  1. Where do you find the recommended chip load for a particular bit? Whiteside bits for example. I checked the bit specs page and don’t see anything there.

  2. Do these calculations somehow take in to account cut depth? I mean, cutting a 1/16" depth vs a 1/4" depth has to be accounted for somehow right?


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Welcome to the Avid forum!

  1. Whiteside has tool definitions for Vectric and Fusion that might contain feeds and speeds (I just found them and haven’t checked yet). If you just want to see numbers, Amana has pdf feeds and speeds charts for similar bits, for example, this 1/4" spiral up-cut.

  2. I’m no expert on this, but here is my understanding. On the most basic level, cut depth can be considered separate from chip load. Chip load is about balancing heating, edge usage, and material removal on the chip level. Cut depth is about what the spindle can handle in terms of power and torque needed for material removal rate (MRR). You also have to account for finish quality (e.g., chatter) and sometimes for chip evacuation (e.g., jamming the flutes when cutting slots). It’s complicated, and I’m sure there’s a lot I’m forgetting.

Start with the spreadsheet values, back off a little, and work your way up, using your ears and the finished surface to choose your operating values. Over time, you’ll be able to pick better starting values out the gate.

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@Stephen is spot on but just remember those values are “starting” values. Your machine may or may not perform well with them.

Also, one thing that can bite you is while the tool is set up correctly from a data perspective, it doesn’t mean all of the values generated from that is correct in things like lead in/out, ramps, etc. in the CAM package you are using.

Wbest what video are referring to ? Can you post a link?

It has a link to a spreadsheet that has some really good data in it. And Cory explains how to use it really well.