# Bit change problems during a project **URL:** \ **Category:** Troubleshooting (X35/X50)\ **Created:** [February 21, 2021, 3:59am UTC](https://forum.onefinitycnc.com/t/bit-change-problems-during-a-project/3714 "2021-02-21T03:59:15Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![bewaddell](https://avatars.discourse-cdn.com/v4/letter/b/958977/32.png) [@bewaddell](https://forum.onefinitycnc.com/u/bewaddell)\ **Post date:** [February 21, 2021, 3:59am UTC](https://forum.onefinitycnc.com/t/bit-change-problems-during-a-project/3714/1 "2021-02-21T03:59:15Z")
I’m having trouble with bit changes during a project. The control screen pauses properly between tool paths and tells me to change the bit. But the resting Z height is not high enough above the project surface for me to drop the first bit and replace with the second. While the project is paused, I can’t use the controller or on-screen controls to move the router from above the project to get room to change the bit. I suspect I’m missing something but this issue is driving me crazy. My only choice right now is to save tool paths with different bits into different files. Is there any way to adjust the resting height of the Z axis? Or is there some way to move the router while paused without stopping the file entirely? ---
**Author:** ![FrankP](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/frankp/32/548_2.png) [@FrankP](https://forum.onefinitycnc.com/u/FrankP)\ **Post date:** [February 21, 2021, 4:28am UTC](https://forum.onefinitycnc.com/t/bit-change-problems-during-a-project/3714/2 "2021-02-21T04:28:19Z")
Hi welcome to the forum. It is recommended save each toolpath as a separate file. But if have the same bit it can be save as one file. So for example if you were going to vcarve (60 vbit) then make a pockets with an 1/8 end mill and then you were going to profile cut. You would save the vbit as one tool path and pocket tools and profile as another. Resetting for when changing your tool. ---
**Author:** ![scottjritt](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/scottjritt/32/1348_2.png) [@scottjritt](https://forum.onefinitycnc.com/u/scottjritt)\ **Post date:** [February 21, 2021, 12:44pm UTC](https://forum.onefinitycnc.com/t/bit-change-problems-during-a-project/3714/3 "2021-02-21T12:44:15Z")
take a look here. [https://forum.onefinitycnc.com/t/bit-setter-macro-v2-0/2757](https://forum.onefinitycnc.com/t/bit-setter-macro-v2-0/2757) ---
**Author:** ![makingmagick](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@makingmagick](https://forum.onefinitycnc.com/u/makingmagick)\ **Post date:** [February 22, 2021, 6:37pm UTC](https://forum.onefinitycnc.com/t/bit-change-problems-during-a-project/3714/4 "2021-02-22T18:37:01Z")
I believe you can move it anywhere you want as long as you do not reset the X and Y Zero points on the controller! You need to to this to reset the Z Zero (after bit change) in a location that has not been carved… Maybe this will help? [![](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/9/9895a32bb741fd099c736a3e8b2d2c6aa8256cc4.jpeg "Multiple Tools On the Onefinity (Community Made)") ](https://www.youtube.com/watch?v=7ennS0C57fg) ---
**Author:** ![popec](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/popec/32/609_2.png) [@popec](https://forum.onefinitycnc.com/u/popec)\ **Post date:** [February 25, 2021, 9:33am UTC](https://forum.onefinitycnc.com/t/bit-change-problems-during-a-project/3714/5 "2021-02-25T09:33:07Z")
Great video Tony for beginners looking how to get started on their first projects involving tool changes. I have seen a few posts where new users were a little lost on how to begin–this will help greatly. Thanks for taking the time to make it & post! ---
**Author:** ![Dirt](https://avatars.discourse-cdn.com/v4/letter/d/898d66/32.png) [@Dirt](https://forum.onefinitycnc.com/u/Dirt)\ **Post date:** [March 13, 2021, 8:09pm UTC](https://forum.onefinitycnc.com/t/bit-change-problems-during-a-project/3714/6 "2021-03-13T20:09:40Z")
Perhaps I don’t fully understand the issue. I use the gcode section under the 1F settings fly-out and modified the tool change section to raise the bit when tool changes, set the new z level, lower the z down and resume… (Runs on M6, tool change) M70 G21 S0 M0 M6 (MSG, Change tool and attach probe) F100 (probe to minimum z soft limit, which is -10) G38.2 Z-10 G92 Z15.4 g0 Z30 M0 (MSG, Remove probe, start spindle) M72 works for me. I had to play on how high to raise the Z ---
**Author:** ![MikeH](https://avatars.discourse-cdn.com/v4/letter/m/258eb7/32.png) [@MikeH](https://forum.onefinitycnc.com/u/MikeH)\ **Post date:** [March 14, 2021, 2:45am UTC](https://forum.onefinitycnc.com/t/bit-change-problems-during-a-project/3714/7 "2021-03-14T02:45:57Z")
In V-Carve, in the Material Setup section (first thing you do when building a toolpath), at the very bottom is a section “Home / Start Position” that lets you set where you want the router to be when it’s time for a tool change. Increase the Z Gap to give yourself enough room for the tool change.