fortyfivecal

Again, thank you for your business and the mention Mark. In the manner I construct them they can be taken apart readily and re-assembled, with both permanence in mind and for someone who wishes to display their fine firearm at a gunshow and needs to transport the stand easily. The only limit to what goes on the stand is the owners imagination, variations from basic paint and stencil, to different woods and other materials including both custom text or laser cut images. I have a good connection with a laser shop, and he does very nice work. The next project is to find the balance points for an MG34 and alter the stand to safely support the additional length and weight of a larger firearm. The stand made from sufficiently thick black plastic, and the upright support laser cut with a grey relief of the Wehrmacht/Heer symbol seen on the WWII issue helmets. My M1/M1A1 display Thompson needs a stand of it's own to, perhaps the base laser cut, with a period map of Normandy featuring St. Mere Eglise, with the " Kilroy was here " cartoon on the upright... Thanks again for your order Mark, you re-awakened my interest in these stands.

Mark- That is one nice 1921AC you've put together! Thank you for the mention on the stand(s), I'm looking forward to seeing photo's of your Thompson displayed on it. Dave

Ending has a nice tribute to the Thompson SMG, camera pulling back in a vertical view of the tank turret, spent .50cal casings from the M2, and a lone Thompson.

Hello and thank you for taking time to read this post. I'm looking for dimensional drawings for the MP40, I am particularly interested in the barrel dimensions, but, drawings for the lower frame/trigger assembly would also be useful. thank you!

some great photographs...

Jim- legal issues aside , while you could laser sinter metal TSMG parts, i can think of 2 issues that would make the concept problematic. first, laser sintering would not generate a part accurate to the smallest detail, it would require machining to achieve the close tolerances necessary for a Thompson to function, the receiver for example. and second, i'm not sure the finished part would stand up to the dynamic forces involved in firing the gun, the receiver could be prone to stress fatigue from the bolt cycling. there are many issues yet to be resolved with metal laser sintering, heat bloom for example. on intricate portions of the work piece, as the laser transits from one geometric dimension to another, the laser can spend more time in that area ( think the interior corners of a TSMG receiver ), the result being a different hardness than on the flat open areas, an overheated area, just where it would be prone to cracking. don't get me wrong, the technology is amazing, the hand held laser coordinate measuring device shown in the youtube video is a marvel in itself, imagine how handy that would be to make accurate measurements, although there is a bit of slight of hand in the video, the laser can only measure what it "see's", so a working crescent wrench, one that moves, would require more information than what a simple red laser scan would detect. stereo lithography, what the base concept for "printing" is called, has been around for about 20 years, my Dad was a pattern maker, and rapid prototyping was coming on line just as he retired, that where i first heard of it. the military also benefits in that laser sintering can also repair a part, rather than make a new one, cracks cen be repaired, a missing tooth on a gear can be replaced, as stated above, the metal is bonded at the molecular level so the new tooth becomes part of the gear....

the military has what they call a "mobile parts hospital", using a laser and powdered metal, they can create or repair parts in the field using CAD files with the correct dimensions, currently they still need to finish machine or grind the parts, as they say they are within .015 " tolerance of true size. one day the additive approach to machining will replace the method of removing steel to achieve the diesired part. laser sintering with metal is as mentioned, a very similar concept to the thread topic.

Hello and thanks for taking time to read this. Does anyone know or have the dimensions for the cleat on the bayonet lug, that the M-1917 bayonet locks on to? Width and thickness? thanks!

as stated, photos would clear up a lot of questions, particularly where the 1/8 inch piece is welded, and a photo of the rear of the receiver as its it viewed above the stock. a shot in the dark from your written description, an M1 series lower frame, bolt group, and stock, that was force matched to a 1928A1 receiver. just a guess...

thats a great display, David.

Dennis, at green mtn. is good people, and always helpful. perhaps over time they will fine tune their cnc programs to get the outer dimensions correct, they seem to be having trouble getting the cooling fins in the right place(s). their real selling points are the correctness of the barrel threads and chambering. for me, they are a good basis to re-process, in that i add the cooling fins for the ' 21 and ' 28 models, and remove the cnc turn lines prior to blueing.

for the price they are hard to beat. i've had my hands on several, they are out of spec' on some of the outer diameters and the contour, as they are using point to point cnc machining as their finish process, this is most noticeable on the types without fins, and they have the cnc turnlines. but again, there is no one else selling new barrels at this price and those that do, possibly are buying from green mtn.

impressive! congratulations!

how would a BATFE agent, with a full load of caffeine view, a 13.5 inch barrel with the compensator attached? technically, the compensator is removable, and the true barrel length is less than 16 inches, that is, regarding a gun that did not originate as a pistol...

congratulations on your acquisition, sounds like an interesting TSMG.