# Precision Off by .2mm When creating popsicle stick Jigg **URL:** \ **Category:** Uncategorized\ **Created:** [April 16, 2023, 6:37pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069 "2023-04-16T18:37:21Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![markalanevans](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/markalanevans/32/8212_2.png) [@markalanevans](https://forum.onefinitycnc.com/u/markalanevans)\ **Post date:** [April 16, 2023, 6:37pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/1 "2023-04-16T18:37:21Z")
I’m trying to make a JIG so that i can laser popsicle sticks. I’m using fusion 360. I’m using this bit: (v1.3 of the BitsBits Fusion Tool Library) > **[\*Astra Coated\* Bits&Bits SRF4-250UP - 1/4" Up-Cut Spiral Bit - BitsBits.com](https://bitsbits.com/product/srf4-250up-cut/)** > > Astra Coated 1/4" Up-Cut Spiral Bit with 1" length of cut. Versatile up-cut spiral bit can be used in any router, CNC, or router table. This is the latest machine i’m using for Fusion360 / OneFinity > **[Post Library for Autodesk Fusion 360 | Autodesk Fusion 360](https://cam.autodesk.com/hsmposts?p=onefinity)** > > Autodesk Fusion CAM Solutions i’m cutting 3/4 MDF. Here is my file: [Popsicle Stick v1.f3d](https://forum.onefinitycnc.com/uploads/short-url/3MvfrItE5FtjSzu85bOJYjWLF7I.f3d) (183.0 KB) The Design calls for a width of 9.6mm ![Autodesk_Fusion_360](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/1/0/10083cf722baac956369cbd0b43f61cb3c9612ec.png) After the CNC cuts it, the width 9.38-9.42mm instead of 9.6mm. Why is this ~ .2mm off? What setting or tunning in the device should I look at? ![IMG_0364](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/4/0/4058d1dee23a1002667bb6e70e19a6832e82e4dd.jpeg) ---
**Author:** ![Discounttoolbox](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/discounttoolbox/32/31115_2.png) [@Discounttoolbox](https://forum.onefinitycnc.com/u/Discounttoolbox)\ **Post date:** [April 17, 2023, 12:22am UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/2 "2023-04-17T00:22:36Z")
I would measure the bit to make sure it is 1/4 inch also make sur it is far enough into the collet. May be deflection. ---
**Author:** ![markalanevans](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/markalanevans/32/8212_2.png) [@markalanevans](https://forum.onefinitycnc.com/u/markalanevans)\ **Post date:** [April 17, 2023, 4:39pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/3 "2023-04-17T16:39:30Z")
I just checked and the bit is measureing .24 inches so it’s pretty close and it is installed all the way in. Any other ideas? ---
**Author:** ![WaywardWoodworker](https://avatars.discourse-cdn.com/v4/letter/w/e79b87/32.png) [@WaywardWoodworker](https://forum.onefinitycnc.com/u/WaywardWoodworker)\ **Post date:** [April 17, 2023, 4:45pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/4 "2023-04-17T16:45:41Z")
If your error is 0.2mm that is about 0.008" and your bit is 0.240" and not 0.250" that is 0.010" of deviation which is greater than your reported 0.2mm error. The bit is the most likely source of the error. In Fusion you can use the “stock to leave” value with a negative number to correct for the undersized pocket. I use this method to fine tune neck pockets. ---
**Author:** ![markalanevans](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/markalanevans/32/8212_2.png) [@markalanevans](https://forum.onefinitycnc.com/u/markalanevans)\ **Post date:** [April 17, 2023, 4:53pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/5 "2023-04-17T16:53:42Z")
Well the bit is .2465". ---
**Author:** ![markalanevans](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/markalanevans/32/8212_2.png) [@markalanevans](https://forum.onefinitycnc.com/u/markalanevans)\ **Post date:** [April 17, 2023, 4:54pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/6 "2023-04-17T16:54:34Z")
Let me do the math there and see about using some negative stock to leave. Thank you! ---
**Author:** ![markalanevans](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/markalanevans/32/8212_2.png) [@markalanevans](https://forum.onefinitycnc.com/u/markalanevans)\ **Post date:** [April 17, 2023, 5:51pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/7 "2023-04-17T17:51:03Z")
That was it. I just did the diff of the spec vs actual and then i also added in a finishing pass to smooth it. This is my first “Test” project now that i have my wasteboard system done. But man, remembering to set all these settings plus needing to test them all. Does this just become 2nd nature? Do you typically do lots of test pieces? ---
**Author:** ![Discounttoolbox](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/discounttoolbox/32/31115_2.png) [@Discounttoolbox](https://forum.onefinitycnc.com/u/Discounttoolbox)\ **Post date:** [April 17, 2023, 9:38pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/8 "2023-04-17T21:38:58Z")
Glad you found a solution I always double check bits if I am doing precision work where size does matter. I also double check material thickness as wood dimensions are rarely what they are stated to be. ---
**Author:** ![Dr-Al](https://avatars.discourse-cdn.com/v4/letter/d/cc9497/32.png) [@Dr-Al](https://forum.onefinitycnc.com/u/Dr-Al)\ **Post date:** [April 17, 2023, 9:54pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/9 "2023-04-17T21:54:47Z")
If you are using Fusion then you can go into the tool library and edit the diameter of the bit. I have all my bits saved under my name so I don’t have to search through a giant list to quickly find them. I do things like set the cooling turned off by default. You’ll have to update it when you replace the bit after measuring the new one. With Fusion there’s lots of settings that you will learn to remember. Write notes for now because you’ll do something once and then not do it for months or years later and forget the details on how you did it. ---
**Author:** ![markalanevans](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/markalanevans/32/8212_2.png) [@markalanevans](https://forum.onefinitycnc.com/u/markalanevans)\ **Post date:** [April 18, 2023, 4:01pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/10 "2023-04-18T16:01:37Z")
Yea. THis is all new to me. So I’ll try editing the bits. Maybe make my own library 😉 ---
**Author:** ![Dr-Al](https://avatars.discourse-cdn.com/v4/letter/d/cc9497/32.png) [@Dr-Al](https://forum.onefinitycnc.com/u/Dr-Al)\ **Post date:** [April 18, 2023, 4:05pm UTC](https://forum.onefinitycnc.com/t/precision-off-by-2mm-when-creating-popsicle-stick-jigg/20069/11 "2023-04-18T16:05:19Z")
I have the Amana router bit library saved. Any bit that I own that matches one of theirs I save in my own library. It’s just a matter of finding the bit and copying the data so you can create the bit in your personal library. Once you do it you’ll wonder why you didn’t do it sooner.