# Blue & White 100W CO2 - Parts aren't cutting to the correct size **URL:** \ **Category:** Ruida controllers\ **Tags:** ruida\ **Created:** [May 6, 2024, 1:29pm UTC](https://forum.lightburnsoftware.com/t/blue-white-100w-co2-parts-arent-cutting-to-the-correct-size/138236 "2024-05-06T13:29:19Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![ednisley](https://forum.lightburnsoftware.com/user_avatar/forum.lightburnsoftware.com/ednisley/32/40455_2.png) [@ednisley](https://forum.lightburnsoftware.com/u/ednisley)\ **Post date:** [May 6, 2024, 6:05pm UTC](https://forum.lightburnsoftware.com/t/blue-white-100w-co2-parts-arent-cutting-to-the-correct-size/138236/3 "2024-05-06T18:05:16Z")
> [@Fbmstar](#): > > - pulled out the dial indicator > - adjustments to the step length > - back lash settings in the Ruida > - cut another part out with no kerf offset I fear you’re digging yourself into a hole. Reset the controller back to the way it was; there should be an automatic backup of those settings made _before_ your changes. Set the controller’s backlash adjustments to zero. Turn off any kerf settings and disable `Hide Backlash` in LightBurn. Set the distance per step value to the _exact_ number calculated from the stepper driver’s `step/rev`, the number of teeth on the motor pulley, and the belt tooth pitch, thusly: > [@"Dotted" line on y axis](https://forum.lightburnsoftware.com/t/dotted-line-on-y-axis/111186/19): > > That suggests the tracking adjustment is incorrect, which isn’t surprising, as the machine “worked” well enough to pass whatever criteria they use for final inspection. The belt passes over an idler pulley at the front of the machine, in a place where it can barely be seen, with provision for tension & tracking adjustments. On mine, the pulley rests in a yoke passing through two slots in the machine frame with a pair of screws pushing against the front of the frame, almost inaccessible from an… Verify that setting using a good scale and the red-dot pointer on your laser or measuring the distance between manual pulses in paper, using just the console buttons to move the laser in exact increments: > **[OMTech 60 W Laser: Axis Scale Check](https://softsolder.com/2022/06/14/omtech-60-w-laser-axis-scale-check/)** > > Neither of those changes was large enough to affect the outcome Use LightBurn to measure the _actual_ kerf in the material you’re using: > [@Kerf Offset test: with built-in vernier scale for accuracy, no tools required!](https://forum.lightburnsoftware.com/t/kerf-offset-test-with-built-in-vernier-scale-for-accuracy-no-tools-required/98333): > > There has been a bit of a flurry of marquetry lately on the forum, and it prompted me to make a tool to help calculate kerf offset accurately and easily, while using minimal material: I was inspired by @jkwilborn’s [tool](https://forum.lightburnsoftware.com/t/marks-bumps-from-laser-refracting-off-honeycomb-laser-bed-is-that-a-thing/58558/4), but I added a [vernier scale](https://en.wikipedia.org/wiki/Vernier_scale) to make it easier to measure, without needing calipers! Just cut it, slide it, and calculate your kerf. Here’s the file: [Kerf Test with Vernier Scale.lbrn2](https://forum.lightburnsoftware.com/uploads/short-url/sgSzZNLnuzCgfSmvnT5XXs5SOFj.lbrn2) (2.4 MB) I’d love any feedbac… Use this test pattern to measure the _actual_ backlash: [BacklashTest.lbrn2](https://forum.lightburnsoftware.com/uploads/short-url/UrgIXeon4Fg5D3NQeYiTSnAAZh.lbrn2) (197.6 KB) If you can’t measure (or even see) the backlash on that pattern, then it’s (almost certainly) too small to matter. With those measurements in hand, you may find the machine is working better than you expected. Let us know what you find. --- _[View the full topic](https://forum.lightburnsoftware.com/t/blue-white-100w-co2-parts-arent-cutting-to-the-correct-size/138236)._