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Post by Kev on Oct 18, 2011 0:03:28 GMT 1
Kevin, I have seen a copy of a mid 1950's CAL colour brochure which shows " rimless " Brens (among other things) as "some of our recent projects" Unfortunately I haven't been able to find it again, but I'm looking. That would be very interesting LE if you can find it  I would pressume it would refer to the CAL 7.62mm NATO conversion rather than any 7.92mm conversion though ? While on the subject of the 7.92mm 'sterile' Brens a live gun was for sale in Germany a few weks ago.   ATB Kevin |
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Post by britplumber on Oct 18, 2011 21:06:45 GMT 1
Kev, have you noticed the machining marks on the side of the body? The marks run vertical (Apart from the odd one long one, which i suspect is from a second pass of the tool) where as all the Mk2 body varients I've actually had a good look at have horizontal machine marks, could the resistence Brens been normal 7.92 Brens with the original markings milled off rather than being a new, unmarked body? Just a thought.
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Post by woodsy on Oct 19, 2011 0:41:25 GMT 1
I believe those marks are light chatter marks which occur when the feed rate is a smidge high, or the length of cut on the vertical cutter is deep. These cuts have been made on a vertical mill rather than a horizontal job which would leave tell-tale elongated marks.
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Post by Kev on Oct 19, 2011 19:41:16 GMT 1
Kev, have you noticed the machining marks on the side of the body? The marks run vertical (Apart from the odd one long one, which i suspect is from a second pass of the tool) where as all the Mk2 body varients I've actually had a good look at have horizontal machine marks, could the resistence Brens been normal 7.92 Brens with the original markings milled off rather than being a new, unmarked body? Just a thought. Chris,the widths are within manufacturing limits on both types (as is the rear of the body where the serial number is) so no material milled off. I am trying to get more info and pics but as woodsy has said it looks like 'chattering' .The bodies on all the 'sterile' Brens seems to be quite bad for this but the one in Germany seems quite prominent. Having said that have a look at the mag well side on this Inglis Chinese contract 7.92mm Bren.  ATB Kevin |
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Post by woodsy on Oct 19, 2011 20:52:50 GMT 1
Kev, if you study the marks you will see they are in a large arc. They would have been done by a large diameter facing cutter and were probably the intitial facing cuts on either side of the body to make it parallel for all subsequent operations.
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Post by leeenfield on Oct 21, 2011 3:35:01 GMT 1
Kevin, I have seen a copy of a mid 1950's CAL colour brochure which shows " rimless " Brens (among other things) as "some of our recent projects" Unfortunately I haven't been able to find it again, but I'm looking. That would be very interesting LE if you can find it I would pressume it would refer to the CAL 7.62mm NATO conversion rather than any 7.92mm conversion though ? While on the subject of the 7.92mm 'sterile' Brens a live gun was for sale in Germany a few weks ago. ATB Kevin No it was either a .30-06 or an 8mm |
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Post by Kev on Oct 21, 2011 20:39:26 GMT 1
Hi Rod,I'm not quite sure the lines are in a large arc ? Close up of lines -  If they were made by a large diameter cutter it would have probably also have cut into the cocking handle slide runway which sticks out a fair bit ?  Any ideas ? ATB Kevin |
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Post by Kev on Oct 21, 2011 20:43:26 GMT 1
LE hope you are not too busy this weekend  It would be very interesting to find the info on the CAL .30-06 or 8mm coverion work. ATB Kevin |
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Post by woodsy on Oct 22, 2011 2:05:54 GMT 1
Hi Kev. Yes, you are correct when you see it like that. They are definite machine marks though and not chatter. Perhaps a big slabbing cutter in a horizontal mill, but clearly going across the action rather than longitudinally. They almost look like shaper marks but that would be a very slow and inefficient way to do it.
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