jeremiah.peschka

This is all awesome information. Thank you both.
 

There's definitely no derailment here, I'm learning a lot from everything written above.

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hope something there helps.

Yes! I had to read your post a time or two, but it clicked!

I'm using a Shapeoko with limit switches and Carbide Motion has 9 pre-designated homing positions. Doesn't matter if they're an inch or a foot away from zero, it's a known reference point which then makes everything else easier.

Thank you!

Long time lurker, first time caller...

I've been learning CNC to build guitars, but one thing that's been a frustration is getting two-sided builds to come out with virtually no misalignment.

Historically, I've had a few missteps that have resulted in significant misalignment. Today's process is:

• Placing the blank on the CNC.
• Drilling two holes along the center line (ish)
• Placing the blank on a pair of fixturing pins in a fixture plate from Saunders Machine Works.
• Securing the blank so it doesn't wander.
• Setting zero based on the top and center of the material. I'm finding the center by going corner to corner.

Unfortunately, there's still 1/8" - 1/16" misalignment between the top and bottom of the body. It's not awful and can be taken off with a table router, but I'm wondering:

How do y'all ensure that you can reliably flip a guitar on the CNC so you can do two-sided work?