I’ve been told by Tech Support that the maximum feed rate for a Benchtop Pro w/nema 23 is 200ips and a Pro 4824 nema 23 is 250ips. We have many bits that specify higher feed rates … what is the recommended resolution to this issue? If we shouldn’t exceed a certain feed rate, shouldn’t CNC12 impos…

Run slower rpm on your spindle. Match up your spindle rpm to the feed rate you can reach. Cutters do not have to run at RPM max’d out. Provide some example cutters and can give you some direct examples

WoodPeckers [image] Solid Carbide Short Up-Cut Compression Router Bit, 2+2 Flute Compression bits combine up-cut and down-cut geometry to give you an incredibly clean edge on both the top and bottom of your material. But if the up-cut portion is thicker than your material, the compres…

I did not see any recommended feed rate at those links. You need this Feed Rate Formula Feed Rate=RPM X Number of Flutes X Chip Load Feed Rate (IPM) = Spindle Speed (RPM) × Flutes × Feed per Tooth (inches/tooth) Example • RPM = 18,000 • Flutes = 2 • Chip load = 0.005” 18,000 X 2 X 0.005 = …

So I’ve done alot of reading on chip load and for hardwood ideal is from .019 to ,021. so 18000 results in a IPM of 684 … way too fast for any AVID machine (servos are 600). To get below 250ipm with a 1/2” bit in hardwood i have to be at about 6500 RPM … well below the recommended minimum … so .…

I would consider chip loads that are 1/3 to 1/2 of those you listed. Maybe others can provide what they are using.

What specific bit are you looking at here… The flute count really matters here… If you want to drop below 684 you drop your RPM too to hit the same chipload…

I do understand the math. The bit is the woodpeckers 2 flute at the top of the thread, [image] Solid Carbide Short Up-Cut Compression Router Bit, 2+2 Flute Compression bits combine up-cut and down-cut geometry to give you an incredibly clean edge on both the top and bottom of your …

The reason im here is because Fusion threw an error when we had a tool over 250ipm, the stated max for a NEMA23 Pro machine …Shouldn’t CNC12 throw an error as well? I assume at sustained rates over 250ipm something is going to break.

Thanks David, yes, the CAM software should, and as I said Fusion goes a step further and warns you when your tool definition is beyond the machine limits. I’m running a maker space, I cannot be 100% sure that a members tool library or selection is consistent with the machine. As you know most o…

Maximum Feed Rates

DavidL April 10, 2026, 3:55pm 10

Hey Jim, this is a common question on the forum (tool manuf. recommended feeds/speeds/chip loads vs various machine configurations). It’s a rite of passage for any operator!

Regarding the question about CNC12 limiting rates, in my opinion the CAM software that contains all your tool data should act as the gatekeeper and not the control software.

Here are some other topics where community members have ‘chipped’ in with their approach:

Topic		Replies	Views
Feeds and Speeds for S30C + Pro with Nema 34	10	333	September 18, 2024
Missing steps with a NEMA 23 setup	58	1369	November 25, 2022
Feeds, Speed and Chip Load Questions	4	649	November 16, 2022
[feed & speed] wood bank	2	278	October 28, 2022
Brands of milling cutters and speeds avid 4896	11	159	February 2, 2026

Maximum Feed Rates

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