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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Machining Question
I'm close to milling my AR lower receiver, this "95%" machined receiver needs a pocket for the fire control group and 3 holes cross drilled for 2 pins and a selector/safety. I found some instructions for machining the pocket using a DRO, they recommend drilling the selector switch hole, machining the pocket then drilling the trigger & hammer pin holes. Why not drill all 3 cross holes in that 1 setup and then machining the pocket? I would think the drill bits might be more likely to walk as they start through the 2nd side. I don't see a benefit to set up for drilling, turn turn the part for milling, then turn back to the first setup to drill 2 more holes, any idea why they would do, or recommend this? https://colfaxtactical.com/docs/Fire...%20a%20DRO.pdf RogerN |
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