Posted 12 October 2019 - 10:02 PM
I started with.400 and it’s fine but the material is quite thin between the counterbore holes for the barrel mounting holes. I tried.385 on the second and the material between the holes was more stable but I got a little bit of chatter when boring the holes. Both of them displaced a lot of metal at the surface when drilling the holes requiring more deburring than I expected. I drilled pilot holes and finished with endmills on last one and it came out much better.
In retrospect, I should of made these first so the holes would be fully supported going into the aluminum fixture holding the part. I made the bolt carriers first so the holes are .420 and it caused a burr I had to remove on the barrel plate in all the barrel holes. Not a big deal but one more step that could of been avoided.
- Dave, bruski, Sparky_NY and 1 other like this
Posted 11 November 2019 - 07:29 PM
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Posted 03 February 2020 - 07:59 PM
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