# Why do I get these nasty corners?

**URL:** <https://forum.avidcnc.com/t/why-do-i-get-these-nasty-corners/5361>\
**Category:** General Chat\
**Created:** [October 14, 2025, 3:14pm UTC](https://forum.avidcnc.com/t/why-do-i-get-these-nasty-corners/5361 "2025-10-14T15:14:25Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![Talvoryn](https://avatars.discourse-cdn.com/v4/letter/t/c6cbf5/32.png) [@Talvoryn](https://forum.avidcnc.com/u/Talvoryn)\
**Post date:** [October 16, 2025, 2:57pm UTC](https://forum.avidcnc.com/t/why-do-i-get-these-nasty-corners/5361/21 "2025-10-16T14:57:02Z")

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I’ve seen corners like that before when the feed or acceleration settings were just a bit too high. Even if the pinions are tight, the machine can still flex a little under load, especially at 3/4” depth. You might try a shallower pass or drop the feed rate 10–15% and see if it smooths out.

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**Author:** ![carpsof](https://avatars.discourse-cdn.com/v4/letter/c/bc79bd/32.png) [@carpsof](https://forum.avidcnc.com/u/carpsof)\
**Post date:** [October 16, 2025, 4:11pm UTC](https://forum.avidcnc.com/t/why-do-i-get-these-nasty-corners/5361/22 "2025-10-16T16:11:39Z")

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> [@Talvoryn](#):
>
> acceleration settings were just a bit too high.

Where do you change accel settings?

> [@Talvoryn](#):
>
> drop the feed rate 10–15%

I dropped the speed 25% and still had the problem.

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**Author:** ![Eric](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/eric/32/3220_2.png) [@Eric](https://forum.avidcnc.com/u/Eric)\
**Post date:** [October 16, 2025, 8:47pm UTC](https://forum.avidcnc.com/t/why-do-i-get-these-nasty-corners/5361/23 "2025-10-16T20:47:39Z")

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> [@carpsof](#):
>
> Where do you change accel settings?

You’re on a Mach machine right? There’s a good thread about that here: [Mach 4 Acceleration/ Deceleration](https://forum.avidcnc.com/t/mach-4-acceleration-deceleration/1123)

> [@carpsof](#):
>
> I dropped the speed 25% and still had the problem.

Before you even reach for a software solution make sure your machine is mechanically sorted out.

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**Author:** ![carpsof](https://avatars.discourse-cdn.com/v4/letter/c/bc79bd/32.png) [@carpsof](https://forum.avidcnc.com/u/carpsof)\
**Post date:** [October 20, 2025, 10:46pm UTC](https://forum.avidcnc.com/t/why-do-i-get-these-nasty-corners/5361/24 "2025-10-20T22:46:31Z")

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Pinions are tight as a drum, but I think I found the culprit. The Z-axis carriage mounting screws have worked themselves loose and the whole thing had a bit of pivot slop. I put some thread locking compound on them and re-tightened them. (I suggest other owners do the same). Fingers crossed this fixes it.

 ![IMG_3706](https://canada1.discourse-cdn.com/flex027/uploads/avidcnc/original/2X/c/cd63ffbe21b4cf2b0a554ce05a19b55bc0424261.jpeg)

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