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The New Automag

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Phenry3 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phenry3 Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2017 at 1:43pm
The same goes for the reason we resigned the cocking piece.
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Phenry3 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phenry3 Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2017 at 1:46pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Nada Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2017 at 10:37pm
Very instructive pics, thanks.

But, would the flaws were caused by the design or the quality of the parts?
Maybe the same parts properly machined from billet would have been enough to stop the failures?
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Pasadena-Joe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasadena-Joe Quote  Post ReplyReply Direct Link To This Post Posted: 05 May 2017 at 12:07am
Not looking to knock you guys but 100 broken bolts out of 10,000 guns for a brand new design gun and assume some percentage were quality issues and some were owner issues and some maybe just final fitting and it doesn't sound that bad to me considering it was in the early 1970's from a bunch of guys taking their first pass at making guns. 

Wish you guys luck doing better in your first 10,000 guns.

I think they did pretty good all things considered.  Sure there is room for improvement and lots of lessons have been learned since then so you got a good chance of doing better.  just dont bet your last dollar on doing better than HS & his team.  I got no complaints about their product 45 years after they built it and I would buy another without a worry.  Just sayin.  -joe
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TRX302 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRX302 Quote  Post ReplyReply Direct Link To This Post Posted: 05 May 2017 at 12:12am
Early "A" bolts were Carpenter 455. El Monte "A" bolts were upgraded to Carpenter Custom 630, which was supposed to be the to be the same as 17-4PH stainless, after November 1974. B bolts were Carpenter 158. A handful of bolts (probably B models) were made of Carpenter H-13. Heat treat specs varied from 39 to 58 Rockwell C scale. (information per Kent Lomont)

I have a note about bolts shucking the cocking piece flanges after a few thousand rounds; I didn't note the source, but I'm fairly sure it was also Kent Lomont. The same note mentions the longitudinal fit of the cocking piece to the bolt was critical for longevity, with .000-.002" given, and that many bolts were machined with square bottoms in the flange grooves, which appeared to be where the cracks started. Both of mine are the early type and have a definite radius, so it could have been a running change or difference between parts vendors.

Looking at the lugs on mine I had assumed it was a casting, but several people with AMT factory connections insisted no cast bolts were ever used. A few years ago someone sold off a bunch of incompletely-finished bolts, all obviously made from bar stock.

Given AMT's commitment to investment castings, I'd be astonished if they didn't try castings at least once...

Max's first prototype used threads instead of lugs to join the cocking piece and bolt.



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Rumore View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rumore Quote  Post ReplyReply Direct Link To This Post Posted: 05 May 2017 at 12:45am
What I find interesting is that there are no bolts shown with ALL the lugs broken....almost as if some of the lugs took more load than others.

When we run loads up in big bore AR's to intentionally see where the lugs will break, they All come off.  We don't just bust off one or two.

Tony


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Callahan's Auto Mag
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRX302 Quote  Post ReplyReply Direct Link To This Post Posted: 05 May 2017 at 1:09pm
I think that's how the 000-002 end play spec came about - to prevent the cocking piece from levering at one lug.
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darrell View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote darrell Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2017 at 4:42pm
Tony, maybe it was in the mechanics of bolt operation. AM torque is loosey goosey out in the open compared to AR's. Somethings got to give, weakest link sort of thing. It is interesting that it's either top or bottom. One of those things that make you go hummmmm.
darrello
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Gerry View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerry Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2017 at 9:49pm
2018 right around the corner, no updates, no complete pistols, no word from Max on the new uppers.
Getting lonely here and losing interest.
Gerry
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Phenry3 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phenry3 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2017 at 12:32am
We expect to be shipping replacement uppers soon. Then we will start selling new uppers with original frames and shortly after that we will be shipping all new guns. All will be done before then end of the year. We just put up our shopping cart and started selling parts and magazines today. SBR is production ammunition at less than $50.00 per box for 240 gr JHP.

Patrick
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