Drilling a hole before flipping

Hello everyone, what is the best way to be able to drill a hole to put a screw through and then flipping the piece over and finishing it on the other side? Is there a way to accurately do this?

@apeeler59

I have only cut a few projects by flipping them. I have a reference fence setup for the X/Y zeros that I use to ensure consistency when flipping.

I have thought thru the use of dowels for flips as well and in my case I determined a minimum of two would be required for alignment. YMMV.

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Either way is effective, as long as you ensure the index surface/point (the face used to align the part) is uniform in both setups.

If you use lower-left for both setups, you are using a different physical corner. i.e. If you flip front to back, the back-left corner becomes the front-left corner after the flip.
The best way to ensure a consistent alignment this way is to machine the back edge in the first setup. And make sure that the front & left edges are flat & perpendicular to start with, as well as the fences/guides you’re using to orient them.

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I have done a few flip jobs. Depending on the size of the piece, there are numerous options available.

Dowels work great. If you look at the images, you can see the holes for the alignment pins.

Here is a pic of my last double-sided job.
Side One:


Side two:

You need to verify if the flip is bottom to top or left to right.

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