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Posted: 8/3/2022 10:25:54 AM EDT
[#1]
0.1575" is the max end of spec.
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Posted: 8/3/2022 10:31:15 AM EDT
[#2]
.157 is w/in spec
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Posted: 8/3/2022 11:01:09 AM EDT
[#3]
if worse becomes worse you could drill them out to .174 and use some old Colt oversized pins and FCG.
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Posted: 8/3/2022 11:15:06 AM EDT
[#4]
Quote HistoryQuoted: 0.1575" is the max end of spec. Quote HistoryQuoted: 0.1575" is the max end of spec. Actually, no, unless he is getting the lower anodized per the drawing. You are forgetting that is the machining drawing and all dimension apply BEFORE final finish, aka anodizing. The anodizing adds to the substrate. So, with an anodizing thickness of 0.001 +/- .0002", the maximum hole diameter is 0.1558". All that said, it doesn't really matter that much, if you don't anodize it. |
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Posted: 8/3/2022 11:33:44 AM EDT
[#5]
Quote HistoryQuoted: Actually, no, unless he is getting the lower anodized per the drawing. You are forgetting that is the machining drawing and all dimension apply BEFORE final finish, aka anodizing. The anodizing adds to the substrate. So, with an anodizing thickness of 0.001 +/- .0002", the maximum hole diameter is 0.1558". All that said, it doesn't really matter that much, if you don't anodize it. Quote HistoryQuoted: Quoted: 0.1575" is the max end of spec. Actually, no, unless he is getting the lower anodized per the drawing. You are forgetting that is the machining drawing and all dimension apply BEFORE final finish, aka anodizing. The anodizing adds to the substrate. So, with an anodizing thickness of 0.001 +/- .0002", the maximum hole diameter is 0.1558". All that said, it doesn't really matter that much, if you don't anodize it. "All dimensions apply before finish". You are correct, I overlooked that. |
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Posted: 8/3/2022 12:52:04 PM EDT
[#6]
Quote HistoryOh, and that drawing has a few errors . . . Mainly in the area of the bolt catch slot, but there are others, and an omission or two that can get you into trouble. |
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Posted: 8/3/2022 1:07:34 PM EDT
[#7]
Quoted: Hi, I machined an 80% lower. When I drilled the hammer and trigger pin holes I forgot that twist drills don't necessarily produce true to size holes and mine measure .157+" with a pin gage. I bought some oversize hammer and trigger pins and the .156" pins fit through the the trigger and hammer. Or should I use normal spec. hammer and trigger pins? My question is will the oversize holes cause the lower to wear faster or cause tolerance stacking issues with the other parts? Thanks In the future if you continue to build 80% lowers and want to continue to improve, learn to drill undersize holes and then use reamers to final size for more perfect holes. |
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Posted: 8/3/2022 1:40:18 PM EDT
[#8]
Quoted:
Hi, I machined an 80% lower. When I drilled the hammer and trigger pin holes I forgot that twist drills don't necessarily produce true to size holes and mine measure .157+" with a pin gage. I bought some oversize hammer and trigger pins and the .156" pins fit through the the trigger and hammer. Or should I use normal spec. hammer and trigger pins? My question is will the oversize holes cause the lower to wear faster or cause tolerance stacking issues with the other parts? Thanks |
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