# IPM Speeds Different During Cut

**URL:** <https://forum.onefinitycnc.com/t/ipm-speeds-different-during-cut/13665>\
**Category:** Troubleshooting (X35/X50)\
**Created:** [June 16, 2022, 9:00pm UTC](https://forum.onefinitycnc.com/t/ipm-speeds-different-during-cut/13665 "2022-06-16T21:00:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Bern](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/bern/32/7185_2.png) [@Bern](https://forum.onefinitycnc.com/u/Bern)\
**Post date:** [June 16, 2022, 9:00pm UTC](https://forum.onefinitycnc.com/t/ipm-speeds-different-during-cut/13665/1 "2022-06-16T21:00:25Z")

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I am doing a profile cut with my .125 Mini Jenny bit, and in VCarve have the IPM set at 100. On this particular piece, the cuts are straight, but on a diagonal (45deg). My speeds during these cuts are only 20IPM according to the controller. Is this because both the X and Y are moving and the OF slows down the IPM?

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**Author:** ![WaywardWoodworker](https://avatars.discourse-cdn.com/v4/letter/w/e79b87/32.png) [@WaywardWoodworker](https://forum.onefinitycnc.com/u/WaywardWoodworker)\
**Post date:** [June 16, 2022, 11:12pm UTC](https://forum.onefinitycnc.com/t/ipm-speeds-different-during-cut/13665/2 "2022-06-16T23:12:06Z")

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It has been my observation the speed the controller reports is whatever feed rate the program has set regardless of the actual speed considering acceleration. Do you have a ramp or plunge that occurs in the program that might be changing the feed rate? I would open the program and search for occurrences of a F20 command which might be changing the feed rate at specific parts of the toolpath.

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**Author:** ![OnefinityCNC](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/onefinitycnc/32/7_2.png) [@OnefinityCNC](https://forum.onefinitycnc.com/u/OnefinityCNC)\
**Post date:** [June 16, 2022, 11:18pm UTC](https://forum.onefinitycnc.com/t/ipm-speeds-different-during-cut/13665/3 "2022-06-16T23:18:41Z")

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FEED: what the cad/gcode program calls for  
VELOCITY: what the controller is actually cutting at

Velocity changes due to many factors, including, s curve, max deviation, jerk, z moves.

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**Author:** ![Bern](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/bern/32/7185_2.png) [@Bern](https://forum.onefinitycnc.com/u/Bern)\
**Post date:** [June 16, 2022, 11:31pm UTC](https://forum.onefinitycnc.com/t/ipm-speeds-different-during-cut/13665/4 "2022-06-16T23:31:08Z")

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I see said the blind man… as he picked up the hammer and saw. Thanks for the quick replies. Derek gets the win, I had a previous toolpath doing a spiral ramp, and I did not de-select that on the following toolpath that cut the part out. Rookie mistake.