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)
This is the latest machine i’m using for Fusion360 / OneFinity
i’m cutting 3/4 MDF.
Here is my file:
Popsicle Stick v1.f3d (183.0 KB)
The Design calls for a width of 9.6mm
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?
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.
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?
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.
Well the bit is .2465".
Let me do the math there and see about using some negative stock to leave. Thank you!
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?
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.
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.
Yea. THis is all new to me. So I’ll try editing the bits. Maybe make my own library 
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.
