Done. I just fliped it around. measured one, twice and three times. put it in a vise and took a big hammer to it. ok kids, don't try this at home. This is for professional amateurs.
Can you explain how it works? SKShunter and Hotbarrel made a really simple one that can be used in a vice that is really simple. Here's one I made a while back that is pretty close to their design. They are really easy to make and use.
Here is the material list from lowes.
3' long 1" angle
3' long 1 1/4" X 1/4" bar (I used 3/16, it bent a little)
2 3" long 5/16 bolts
4 1 1/4" long 5/16 bolts
12 5/16 nuts
Or just use whatever angles,bars,bolts and nuts you have laying around.
Ok, this is how i did it.
Cut 2 pieces of 13" long angles and 2 pieces of 10.5" long bars
Clamp the angles together and drill 5/16 holes at each end. about .5" from the end. Put the 3" bolts in and you got a frame.
Put the flat over the 10.5" bar and center it as much as you can. Trace the Mag well, trigger, grip openings on the bar. Mark the alignment holes on the bar also. Now, you have a general idea on where to drill the holes
Measure to find the center of the bar for the alignment holes and center punch it. Put the flat over it to double check.
Clamp the 2 bars together and drill. I used 1/8" for the alignment holes and 5/16 for the rest. Drill 2 in the mag well, 1 in trigger and 1 in grip.
Use a dremel to clear out a space for the mag well indent and you are done with the bars.
Sandwich the flat between the bars. Use some finish nails to make sure the alignment holes are lined up. Bolt it tight.
I measured the trunnion to be a little over 1 1/4"(32mm) and adjusted the frame to 34mm (1mm flat) wide.
Tighten the nuts, spray on some Wonder Dew 40 and it is hammer time. I would have used a vice but it wouldn't fit in to mine.
I hope that helps.
My next Jig project is a Doct Taped rivet jig. ok Just kidding.
It has not been a problem for me. The only problem i can see is with the rear trunion and if you are building a pistol or folder. I just put the rear end again the angle and hammer it a few time. a little filing will fix it too. I am working on an upgrade that will make the top rail bending easier.
My first build is an AMD-65, and rounded corners at the bottom of the receiver would have been a problem. I used 1-1/4" bar stock ($12) from a local "Metals Supermarkets" (they're on the web, too); no Lowe's stores anywhere near me. The sharp-cornered bar stock made nice crisp bottom corners. Used one of the bars with an oak wedge underneath to bend the top rails. Came out practically perfect.
The info I got on this site made it possible to build a functional rifle my first try. Thanks to all you contributors for sharing the much appreciated info. Cadapult
4130 needs to be bent around at least a 1T radius, where T= the thickness of the material. Perfectly sharp corners are an invitation for cracking in service.
Grasshopper, Great jig! Especially for those who are too economically disadvantaged to buy a proper press and incapable of building or buy one of those heavy duty jigs. I've always figured if the Afgans can build an AK in their bicycle shops, I should be able to do it in my garage.
Please provide more details/photos on how to bend the top rails using your jig.
going GREAT here, Cephus, thanks for asking, buddy.....
I've been Crazy busy for the last couple of months with a new job, and trying to get my house spruced up to sell and relocate my family in the area of my new job.Hopefully I'll be back to my regular mischief here in the next couple of weeks.
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