# 2 sided carve doesn't meet in the middle? **URL:** \ **Category:** Fusion 360\ **Created:** [August 10, 2022, 8:58pm UTC](https://forum.onefinitycnc.com/t/2-sided-carve-doesnt-meet-in-the-middle/14640 "2022-08-10T20:58:01Z")\ **Posts on this page:** 1\ **Showing post:** 6
**Author:** ![BillG](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/billg/32/7347_2.png) [@BillG](https://forum.onefinitycnc.com/u/BillG)\ **Post date:** [August 11, 2022, 12:05am UTC](https://forum.onefinitycnc.com/t/2-sided-carve-doesnt-meet-in-the-middle/14640/6 "2022-08-11T00:05:18Z")
Stradibarrius, I do a lot of two sided carving on mandolin plates and necks… my experience is that you must have a way to index the piece. For example I build the mandolin top/back in Fusion 360 with index holes in the edge of the stock (clear of the actual part) for .25" wooden dowels that go down into the spoil board. When I turn the board over, the pins fit into the same holes and the machine knows “exactly” where the piece is located… If done right, there is no need to re-zero the machine unless you change bits or move your z-axis reference for the next carve. I will zero the x and y position when I turn the machine on and not change it again during a two sided carve because I design in these index holes that allow me to turn the piece over and use the same zero point. I hope this make sense… on a violin neck, I would put an index hole at each end of your stock. Let me know if I have confused you… I will take some pictures to help explain if necessary. Good Luck. --- _[View the full topic](https://forum.onefinitycnc.com/t/2-sided-carve-doesnt-meet-in-the-middle/14640)._