2020-10-18 (Su) 80PercentArRifle

I thought one of the reasons my cutting lines were not even was that my XY slide clamp was not aligned to the drill press. I clamped a tall piece of wood to square it up and positioned it so that a paper scrap just barely fit between the bit and the wood. Then, I moved the clamp and checked that the paper fit as snugly at the other end of the wood.

The more I think about it; it shouldn't matter if the clamp is aligned. So long as the X and Y axes travel true, it should always cut straight lines.
Aligning the XY slide clamp

During the next pass, I focused on squaring up the sides, not actively milling lots of plastic, and the receiver came out a lot cleaner. The edges were neat, but I drilled too deeply. In the instructions and video, they talk about lining up the marking on the milling bit with the top of the jig, but the marking is 1/32" thick, and it wasn't obvious where I should position it.
Improved milling job

The plastic between the fire control area and the inside of the trigger guard was paper-thin. Even before I cut through this area with a drill bit, I could deform the plastic with my finger easily. I didn't know if this would destroy the receiver.
Thin trigger cavity floor

The rest of the posts for this project have been arranged by date. First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7

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