# Using 1/8 inch shank bits **URL:** \ **Category:** Troubleshooting (X35/X50)\ **Created:** [November 21, 2021, 4:59pm UTC](https://forum.onefinitycnc.com/t/using-1-8-inch-shank-bits/9050 "2021-11-21T16:59:13Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![onefinity1](https://avatars.discourse-cdn.com/v4/letter/o/a87d85/32.png) [@onefinity1](https://forum.onefinitycnc.com/u/onefinity1)\ **Post date:** [November 21, 2021, 4:59pm UTC](https://forum.onefinitycnc.com/t/using-1-8-inch-shank-bits/9050/1 "2021-11-21T16:59:13Z")
I an new to the cnc world. I have completed a couple of projects with now issues. Using 1/4 inch shank bits. I am using Easel Pro and I ran my roughing pass with a 1/4 inch shank bit and then needed to change to a 1/32 bit. I have that in 1/8 inch shank. When I changed the bit and started the file it wasn’t cutting in the correct area. How should I probe for the new bit? ---
**Author:** ![suprak](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/suprak/32/5173_2.png) [@suprak](https://forum.onefinitycnc.com/u/suprak)\ **Post date:** [November 21, 2021, 5:40pm UTC](https://forum.onefinitycnc.com/t/using-1-8-inch-shank-bits/9050/2 "2021-11-21T17:40:03Z")
Re-zero the Z axis after installing new bit. ---
**Author:** ![Dr-Al](https://avatars.discourse-cdn.com/v4/letter/d/cc9497/32.png) [@Dr-Al](https://forum.onefinitycnc.com/u/Dr-Al)\ **Post date:** [November 21, 2021, 7:45pm UTC](https://forum.onefinitycnc.com/t/using-1-8-inch-shank-bits/9050/3 "2021-11-21T19:45:13Z")
Did you turn off the 1F while switching bits? If so, don’t. I have done what you are talking about lots of times. Like Alex said, switch bits and then zero just the Z axis and you should be good to go. You may want to try CAMotics to simulate what the G code is telling the controller what to do. I like to split things up to identify where the problem is.