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Posted: 2/15/2024 8:16:32 PM EDT
[#1]
Quote HistoryOriginally Posted By maggiethecat: I meant polymer, dont know why i wrote P-80. Quote HistoryOriginally Posted By maggiethecat: Originally Posted By backbencher: Polymer AR 80%. Not a P80. Drop a polymer AR lower in a thumbhole stock & it should hold up. I just need to learn how to do it instead of casting a lower from epoxy. I meant polymer, dont know why i wrote P-80. EP Armory's are pretty cheap, no reinforcing metal like Tennessee Arms? Just cast nylon. They used to have a bulk buy deal that got em down to $12 each, IIRC. Now they're $25 before shipping & tax. You're probably not saving money by the time you buy a Vism thumbhole, but you're not cutting on the Vism. If you screw up, you throw away a $25 learning experience vs a $50 aluminum one. |
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TX, USA
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Posted: 2/17/2024 10:51:27 PM EDT
[#2]
Using OP's numbers and brand new endmills I cut out a gorgeous receiver. Pocket is a couple thou narrow for the trigger (2 different ones) and a few thou shy on the fwd edge, hammer wont rotate.
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Posted: 2/17/2024 11:01:38 PM EDT
[#3]
Quote HistoryOriginally Posted By maggiethecat: Using OP's numbers and brand new endmills I cut out a gorgeous receiver. Pocket is a couple thou narrow for the trigger (2 different ones) and a few thou shy on the fwd edge, hammer wont rotate. How much material did you cut in your last pass? 1.250 DOC plus enough stick out to clear the RE and I get a lot of deflection trying to clear more than .005 |
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TX, USA
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Posted: 2/18/2024 5:50:58 PM EDT
[Last Edit: maggiethecat]
[#4]
Quote HistoryOriginally Posted By AFCarbon15: How much material did you cut in your last pass? 1.250 DOC plus enough stick out to clear the RE and I get a lot of deflection trying to clear more than .005 I ran in one cut, so .065. seems I had some deflection. I put them back in, ran the same numbers but got some chips. All good now, parts fit well. finishing passes are a good thing. EDIT- brain dump, it'd be half of the .062 |
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Posted: 2/18/2024 6:05:13 PM EDT
[#5]
Quote HistoryOriginally Posted By maggiethecat: I ran in one cut, so .065. seems I had some deflection. I put them back in, ran the same numbers but got some chips. All good now, parts fit well. finishing passes are a good thing. So I cut to the final pass domensions with a 3/8 rougher. That leaves .031 to clean up with a finishing end mill. I then cut all but .005 short with the finisher is one pass, then run the final dimensions in 2 passes. Usually don't cut anything in the seconds, but it saves a lot of setup time if I had to do it again. Also, I always check with a hammer or trigger before removing from the mill. |
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TX, USA
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Posted: 2/19/2024 1:32:23 AM EDT
[#6]
Quote HistoryOriginally Posted By AFCarbon15: So I cut to the final pass domensions with a 3/8 rougher. That leaves .031 to clean up with a finishing end mill. I then cut all but .005 short with the finisher is one pass, then run the final dimensions in 2 passes. Usually don't cut anything in the seconds, but it saves a lot of setup time if I had to do it again. Also, I always check with a hammer or trigger before removing from the mill. yeah, brain dump, forgot to divide the difference by 2, so last pass was .031, not .062 |
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Posted: 4/18/2024 8:13:31 AM EDT
[#7]
Quote HistoryOriginally Posted By backbencher: This is the link provided by the Flat Spot for their weld-together DPMS pattern steel lowers: http://www.theflatspot.net/uploads/6/9/0/0/6900641/dpms_308.pdf 
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Posted: 4/18/2024 2:38:24 PM EDT
[Last Edit: backbencher]
[#8]
Quote HistoryOriginally Posted By OG1: Holy poop....that link has changed over the years lol. It is a porn link now lol. My co-worker was entertained by my fumbling to close it. Quote HistoryOriginally Posted By OG1: Originally Posted By backbencher: This is the link provided by the Flat Spot for their weld-together DPMS pattern steel lowers: http://www.theflatspot.net/uploads/6/9/0/0/6900641/dpms_308.pdf Holy poop....that link has changed over the years lol. It is a porn link now lol. My co-worker was entertained by my fumbling to close it. Lol, that's 8 years old. I got warnings from my browsers to not even connect. Thanks, I went back & removed the link. I suppose given enough time, all links ultimately resolve to porn websites. |
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