# Help: Test aluminium part is oversized **URL:** \ **Category:** Troubleshooting (X35/X50)\ **Created:** [July 30, 2021, 11:00pm UTC](https://forum.onefinitycnc.com/t/help-test-aluminium-part-is-oversized/6971 "2021-07-30T23:00:43Z")\ **Posts on this page:** 1\ **Showing post:** 9
**Author:** ![MikeH](https://avatars.discourse-cdn.com/v4/letter/m/258eb7/32.png) [@MikeH](https://forum.onefinitycnc.com/u/MikeH)\ **Post date:** [August 1, 2021, 2:49am UTC](https://forum.onefinitycnc.com/t/help-test-aluminium-part-is-oversized/6971/9 "2021-08-01T02:49:51Z")
Follow these steps - I had to make some minor adjustments to get my machine spot-on. > [@Testing and tuning OF for accuracy](https://forum.onefinitycnc.com/t/testing-and-tuning-of-for-accuracy/1846/15): > > I promised I would write the procedure I used to test and adjust the accuracy of the OF, so here it is. Decided to add it to this thread rather than create a new one. Things you will need: OF Woodworker (same process for machinist, but adjust sizes) an accurate 36" ruler (a mm rule would be easier, but I didn’t have one) 1/4" shank, 1/4" 45 degree v-bit (larger bits will work, but makes it more difficult to see) Blue tape or masking tape Optional - fine grained 12" machinist ruler Process: … --- _[View the full topic](https://forum.onefinitycnc.com/t/help-test-aluminium-part-is-oversized/6971)._