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Posted: 8/27/2004 7:42:04 AM EDT
[#1]
I also have that drawing and opened it up on ACAD. If it's drawn to scale (which it looks like it is), the demension in questions measures 0.096". |
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Posted: 8/27/2004 7:54:59 AM EDT
[#2]
... This issue came up at my "lower assy party" last Saturday night. The Colts. Tomix and Grizzys were measuring .105 and Ameetec was .082
... I have a 3D CAD parasolid model of an AR15 lower modeled from Colt data. I'll interrogate the web thickness and report back results. |
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Posted: 8/27/2004 11:04:38 AM EDT
[#3]
Edit: Ok, I checked measurements and the drawing is NOT to scale...
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Posted: 8/27/2004 2:08:55 PM EDT
[#4]
... OK, I looked at the CAD model and here is what I got for a nominal (basic) value on web thicknesses in the areas of concern.
MS Word document |
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Posted: 8/27/2004 2:21:24 PM EDT
[#5]
.100 Bushy
.074 Mega |
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Posted: 8/27/2004 9:34:19 PM EDT
[#6]
Hey Winston, how did you extrapolate the measurements? I found that the drawing (the PDF one) is not to scale (after measuring a few places and checking against the given measurement)...
If 0.0960 is correct, then with the deviation listed on the blueprint (+ or - 0.0075) the range would be 0.0885 to 0.1035....if the 0.0960 is correct, then that's funny cuz that would put my Bushmaster within spec (0.0890) and my Colt out of spec (0.0860)... 
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Posted: 8/27/2004 10:09:50 PM EDT
[#7]
... gs430, I did not use a drawing, I used a three dimensional (3D) para-solid Computer Aided Design (CAD) model. A model that is available on this site (here: ZIP CAD file ) if you have the hardware to open the file  ... The model was constructed with original Colt engineering loft data |
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Posted: 8/27/2004 10:39:14 PM EDT
[#8]
0.086 for my RRA, old logo
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Posted: 8/28/2004 6:07:46 PM EDT
[#9]
Ah....cool! Hmmm, I tried to donwload the ZIP file and it says that it's a corrupted archive....anyone got a good copy they can email to me? Now all I need is a CNC machine.... 
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Posted: 8/28/2004 10:47:56 PM EDT
[#10]
.087 on my mega,
according to Mr Digital caliper. |
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Posted: 8/29/2004 12:33:17 AM EDT
[#11]
I have 5 Mega lowers coming in next week...I have a good set of calipers too. I will give measurements for each of them when I get them.
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Posted: 8/29/2004 12:38:55 AM EDT
[#12]
Pre Ban Colt Sporter "Lightweight" = .085 Post Ban Colt Match Target Campetition "H-Bar" = .092 Seems in this case, they are making them BETTER than they used to.. See ya, JMS |
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Posted: 8/29/2004 12:48:54 AM EDT
[#13]
Latest Update:
06| 06|5578 07|04 07|555555 08|0001122222334 08|56677899 09|0001122 09|58 10|03 10|555 Lookin' like a roughly normal distribution. |
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Posted: 9/4/2004 7:55:50 PM EDT
[#14]
Old Colt SP1, '70s era, I think. .077 in the specified area. I've got probably 8-10k rounds through it, and I bought the gun well used, so probably 10-15k rds. No cracks, etc.
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Posted: 9/12/2004 11:10:19 PM EDT
[#15]
Another one to add to mix...
Bushmaster XM15-E2S Serial L144xxx 0.078 |
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Posted: 9/16/2004 4:02:47 PM EDT
[#16]
06| 06|5578 07|04 07|5555558 08|0001122222334 08|56677899 09|0001122 09|58 10|03 10|555 |
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