What diameter bit are you using? The chip load for particle board using a 3/8 bit is .02 to .023 per flute. The chip load for a 1/2 bit is .025 to .027 per flute. This is a great starting point that you can adjust based upon the quality you see. I referenced a link to Vortex's chip load chart for you.
If you are using a 3 flute 3/8 bit at the high end of .023 per flute you would use the following formula- 3(number of flutes) x .023 = .069 x 16000 (rpm) = 1104 ipm. This is a starting point.
The same applied to a 1/2 bit with the proper chip load would be
3 x .027 = .081 x 16000= 1296 ipm.
Here's the problem with either of these scenarios. You're CNC may be capable of cutting at those speeds in a straight line but what happens when you go around corners and arches? The machine is going to slow down while your spindle cuts at the same RPM. This is going to quickly dull your bit and before you know it you'll have bad edges.
I recently did a time study for a customer that was cutting out 5 x 7 inch pieces at a programmed rate of 800 ipm. It took 26 minutes to run the program on his machine (Busellato) I ran the same program at the same programmed feed rate of 800 ipm on the machine that I sell and it took 11:34 to run on the rack and pinion machine and 9:42 on the linear machine. The first point to note is none of the machines reached or maintained the programmed speed of 800 ipm not even the linear machine. The second point to note is that the acceleration and deceleration varies greatly from one machine to another. Depending on your machine you may do better with a 2 flute bit that allows for slower linear speeds that will be more inline with the speed your machine will run in corners. You may be dulling your bit rather quickly due to the acceleration/deceleration of your machine in the corners and arcs.
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