CNC Upgrade and Fretboard program

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Re: CNC Upgrade and Fretboard program

Post by phavriluk »

Kevin Sjostrand wrote: Wed Mar 20, 2024 11:00 pm Oh boy can't wait to see how your fretboard comes out
I'm in awe of this!
peter havriluk
Diane Kauffmds
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Joined: Sun Mar 09, 2014 8:13 pm

Re: CNC Upgrade and Fretboard program

Post by Diane Kauffmds »

Well sports fans, this bad girl is truly finished! Much like my second guitar that I named Delilah (the bad girl), this cnc has truly tried my patience. I finally got the new limit switches working by jumpering out each axis pair. They're much better switches, but they're 2 wire and my board takes 3 wire switches. I could get 1 to work in each axis, but when I plugged in a 4th, none of them worked. But, they're working as intended in all axis now. I've wrapped wires and inserted them into the slots as much as possible to corral them.

I ended up installing a 16mm ballscrew. That's quite an upgrade from the 8mm lead screw that I had originally installed. I bought and installed a 16mm ballscrew for the z-axis, but the stage was too narrow, and I couldn't properly anchor it to the guide rods. I started to buy a different model, but decided not to. While my design on the z-axis isn't pretty, it's damn accurate and solid. So for now, it stays.

The wood is gone and I cut metal plates in its place and replaced each end with 2080 t-slot extrusion. The thing weighs a ton now. I installed what I call "table guides", which are 1" aluminum angle, meant to ensure the table stays straight no matter what I'm cutting. But, that 16mm ballscrew isn't going to allow the table to deflect at all.

I'm still using "sliders" which are 1/8" thick aluminum angle wrapping around the sides to under the table. Under the table, it rides on another angle, attached to the frame. Both surfaces have heavy duty UHMW tape, which they slide, so there's no friction. But, I upgraded from 3/4" angle to 1" for the table itself and 1 1/2" for under it. My husband, both German Shepards, and I, can all stand on it and there won't be any movement or deflection.

I upgraded the motor for the Y-axis to the same high torque nema 23 I'm using on the z-axis. The x-axis still has the nema 17, which easily handles it.

I had to slow down the maximum speed for the Y-axis. Apparently Nema 23 motors (except for closed loop) are limited to 1000 rpm. Nema 17 motors can run as fast as 2000rpm. This wasn't an issue until I installed the ballscrew. In order for the table to move, it takes a lot higher rpm's. So, where I could run the old table, with the small lead screw at 80ipm (or maybe faster), the motor gets unhappy at anything above 60 ipm. So, I've Programmed it so the table can't move faster than 50ipm. I'm in no big hurry and I don't make fretboards and necks for resale. I never run the cnc programs more than 20ipm, and mostly I stick with 14ipm. So, it doesn't bother me.

So, here she is in all her glory. I have 11.5" of active cutting across the x-axis, 6 inches of z-axis movement, and my big goal was to have a cutting area of 22" long on the y-axis. I have 24" of cutting length, right on the money. The entire cnc unit is 16" wide x 31" long.

The table is solid aluminum t-slot, with a spoilboard screwed to the slots. I top it with another spoilboard. As far as table accuracy, it is off by 1/2mm from dead center. I can live with it.

She's obviously homegrown and not a sleek name brand cnc. But, she'll do everything I need very accurately and quietly. She still sounds like R2D2 when she's cutting.
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Diane Kauffmann
Country Roads Guitars
Kevin Sjostrand
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Joined: Sat Feb 09, 2008 8:06 pm
Location: Visalia, CA

Re: CNC Upgrade and Fretboard program

Post by Kevin Sjostrand »

That is a purty beast!
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