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First Cetme build Jig tolerances
Weaponeer Forums : G3 / CETME / MP5 / HK

Posted in G3 / CETME / MP5 / HK
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  TarRiverArms

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Posted: August 07 2017 at 4:40pm | IP Logged Quote TarRiverArms

Hello gents and thanks for all the help I've found in your files so far.

I'm building a flat bending jig. I've already turned the two pieces for the mandrel but have not cut and mated them yet. I am getting ready to assemble the plate using 1" round bars on the plate.

Using an RTG flat I am trying to figure the exterior width of the outside top round due to the stiffening folds that protrude outward along the receiver. Has anyone used one of these flats and had any problems with the folds being smashed while being pressed?

I plan on making a u bracket in order to push the sides in around the mandrel once the initial press has been made. I was wondering if I allowed myself a 0.005 space on either side of the flat for the initial press would their be any foreseeable issue getting the flat to bend to spec on the second pressing around the mandrel?

Once I figure the arc segment geometry I'd like to compare the depths to mill on each mandrel piece with someone who has made these calculations.

Gentlemen, I thank you for taking time to read this and for your input.





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  TarRiverArms

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Posted: August 15 2017 at 10:12am | IP Logged Quote TarRiverArms

So I did some calculations and the calulated geometry does not match up with the actual Measurements with the trunnion.

They're close but not exact. The trunion measurements are greater so if I err I will err on the side of caution. This will allow me to cut more off if the fit is too tight.

Still have no idea as to the width measurements of the bending parts as I have not taken any more measurements.
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