Machine Limits for Tool Data Base

Hi All,

Currently waiting on my machine so in the meantime I have been working on a tool data base chart, and some starting points for Feedrates, RPM, Plungerates, etc.

While doing the math and making my chart, I forgot to ask the limits when it comes to:

  • Max Feedrate the motors can produce
  • Max RPM ( is this based on the router )
  • Max Plungerate

( I’m not looking to run the machine at the Max, so if you have any recommended " sweet spots " or " comfort zones " I would love to hear your recommendations )

I have seen some older posts from last year with a few numbers tossed around, wondering if anyone has any updated numbers. Like I said I dont have my machine yet and feel like I have hit a wall till I have the machine set up, so I’m trying to get ahead with things like this.

If needed, will be using carbide create with gsender or UGS to start.


@DrewBSC Drew: The default set up for the Long Mill has the max feed rate in X and Y set to 4000mm/min and the max in Z set to 3000mm/min. You can change this, of course, but some time ago, the guys wrote about issues when the X and Y were run faster. That said, I believe that some here have done it successfully. As I’m sure you have already read, the optimal feed rate is very dependant on the bit you are using, the speed of the router setting and the material.
The maximum rpm is based on the router. If you are using the Makita, its no load speed range is from 10,000 to 30,000 rpm.
Max plunge rate would, I suppose, be the max feed rate of the axis - defaulted to 3000mm/min. Again, optimal will be based on the bit you are using and the material you are cutting.
If you want to look at a commercially-available chip load chart, this one is quite good as a starting point.

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Thanks for the info @gwilki this is one of the charts i’m working with to make my tool chart. Thanks for the info on the X and Y this is something I overlooked and realized I was looking at industrial set ups that can move faster then 4000mm/min when needed.

Thanks Again

@DrewBSC You’re welcome, Drew. Yeah, it’s something that we need to keep in mind in using chip rate/feeds and speeds charts. Most of them are created for either metal working or commercial machines. We need to recognize the limitations of the Mill, even though it is very stiff. We also must take into account that smaller diameter bits flex when pushed too hard.

This guy is a bit manic, I find, but he does an excellent job of addressing feeds and speeds for hobby machines:

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I run mine on the slow side, hard wood, walnut, maple, sometimes 1/8" bits, I have broken some and when one starts to invest in expensive bits it really hurts. Another plus is the cut is cleaner and less work for the finish stage, pay me now or pay me later.

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