# Fine Horizontal, Short Vertical **URL:** \ **Category:** Troubleshooting\ **Tags:** accuracy, calibration\ **Created:** [September 13, 2018, 3:34pm UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684 "2018-09-13T15:34:45Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![M-Mo](https://avatars.discourse-cdn.com/v4/letter/m/6bbea6/32.png) [@M-Mo](https://forums.maslowcnc.com/u/M-Mo)\ **Post date:** [September 13, 2018, 3:34pm UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684/1 "2018-09-13T15:34:45Z")
Hi everyone! First of all, I’m a new Maslower and this thing is amazing!!! Thanks to the creators! My setup is all set and I already have made some things that not taking real precision and my setup work fine. I’have made the calibration several time, rebuilt precisely my sled and now I’m ready for fine tuning. My first question is: I made a rectangle of 12” horizontal by 24” vertical. The horizontal length is perfect at 12” but I have 3/8” shorter on the vertical length 23 5/8”. What can make this error? Thanks! ---
**Author:** ![madgrizzle](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/madgrizzle/32/1372_2.png) [@madgrizzle](https://forums.maslowcnc.com/u/madgrizzle)\ **Post date:** [September 13, 2018, 3:45pm UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684/2 "2018-09-13T15:45:31Z")
The calibration routine currently used, in essence, gets horizontal measurement dead-on at the expensive of the vertical measurement. I’m trying to develop a new calibration routine to overcome this… its taking time though. This thread may help. > [@What must be adjusted to correct out of round circles](https://forums.maslowcnc.com/t/what-must-be-adjusted-to-correct-out-of-round-circles/3162): > > Have run several circle tests, and they are slightly out of round… In the center towards the top, 6" wide x 5 7/8 " high In the center towards the bottom, 6" wide x 5 15/16" high 30" either side the error narrows to 6" wide x 5 31/32" high What measurement errors cause this problem? FWIW, I used the machine to measure top beam length, and the result was 3004.57… used this for the temp sled calibration. When I calibrated using the new sled, I used a steel rule to measure the distance between… ---
**Author:** ![xrok1](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/xrok1/32/19640_2.png) [@xrok1](https://forums.maslowcnc.com/u/xrok1)\ **Post date:** [September 13, 2018, 4:39pm UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684/3 "2018-09-13T16:39:17Z")
For an experiment you could try uping your rotation radius to 144. Worked for me (don’t tell madgrizzle lol) ---
**Author:** ![xrok1](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/xrok1/32/19640_2.png) [@xrok1](https://forums.maslowcnc.com/u/xrok1)\ **Post date:** [September 13, 2018, 6:50pm UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684/4 "2018-09-13T18:50:00Z")
Let me know if how it works for you. ---
**Author:** ![M-Mo](https://avatars.discourse-cdn.com/v4/letter/m/6bbea6/32.png) [@M-Mo](https://forums.maslowcnc.com/u/M-Mo)\ **Post date:** [September 14, 2018, 12:28am UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684/5 "2018-09-14T00:28:35Z")
Hahaha!! Thanks @madgrizzle and @xrok1. It‘s working! Just put my rotation radius at 139 and it’s much better! I will continue the testing. Thanks a gain! ---
**Author:** ![xrok1](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/xrok1/32/19640_2.png) [@xrok1](https://forums.maslowcnc.com/u/xrok1)\ **Post date:** [September 14, 2018, 12:38am UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684/6 "2018-09-14T00:38:21Z")
👍 awesome! ---
**Author:** ![Jayster](https://avatars.discourse-cdn.com/v4/letter/j/d78d45/32.png) [@Jayster](https://forums.maslowcnc.com/u/Jayster)\ **Post date:** [September 14, 2018, 4:07am UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684/7 "2018-09-14T04:07:24Z")
> [@M-Mo](#): > > Just put my rotation radius at 139 and it’s much better! Where are you currently cutting? Right in the middle 4x4 or out on the ends of the 4x8? Sounds like something to try but curious what the side effects are. ---
**Author:** ![M-Mo](https://avatars.discourse-cdn.com/v4/letter/m/6bbea6/32.png) [@M-Mo](https://forums.maslowcnc.com/u/M-Mo)\ **Post date:** [September 14, 2018, 7:02pm UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684/8 "2018-09-14T19:02:34Z")
Right in the middle. I will make some other tests next week. ---
**Author:** ![xrok1](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/xrok1/32/19640_2.png) [@xrok1](https://forums.maslowcnc.com/u/xrok1)\ **Post date:** [September 14, 2018, 7:45pm UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684/9 "2018-09-14T19:45:52Z")
I made measurements top to bottom and side to side on 4\*8 and found the improvement consistent accross the board. I did not calibration when i set my machine up this time, (raised motors, changed to top feed) cleared settings and entered measurements manually. Ran tests and was 5mm off in the Y, upd rotation radius from 139 to 144 and I’m within .5mm now. Makes me wonder if the routine for calcuating rotation radius insnt somehow faulty or inverted. ---
**Author:** ![Jayster](https://avatars.discourse-cdn.com/v4/letter/j/d78d45/32.png) [@Jayster](https://forums.maslowcnc.com/u/Jayster)\ **Post date:** [September 14, 2018, 8:30pm UTC](https://forums.maslowcnc.com/t/fine-horizontal-short-vertical/6684/10 "2018-09-14T20:30:14Z")
Interesting, I’ll have to try it. I also have only manually measured my calibration and it’s pretty good. Curious to see if modifying the rotational radius will dial it it slightly more for me. Thanks for the possible tip.