Ok, I can't even believe this worked. I made it with some 1" angle and 1 1/4" bars from lowes. :headspin:
The inside dimensions of the yugo reciever are different than a standard receiver due to the thickness of the metal. The outside dimensions of the receiver should be the same. Inside of a standard receiver is 1.25" and a yugo is around 1.20".LonghunterCO said:I think that the inner measurments are the same 1.250". The change, on the Yugo, is in the thickness of the flat 1.50mm vs. 1.05mm. Which on this jig means that the angle iron sections would need to be an additional .45mm apart. Then you would have to remove a section from each angle iron to allow for clearance of the two "Bulged" side areas for the front trunnion. Someone on another board thought that placeing a wedge of oak in the bottom of the jig to limit the flat's (at the front trunnion end) travel into the jig. Therefore not messing up the receivers bulges. I think that some have said that the rails on the flat are already bent so you would not have to worry about that,
Any thoughts?
Brace it? Where? I was thinking of using a large "C" Clamp about mid point on the angle iron to keep it from bowing. Is this what you are talking about?Rikoshay said:I built one similar to JRoybal's, using 3 grade-8 bolts to pull the flat through the angle iron. The flat turned out good, but I'm going to brace it up some more to keep it from flexing on the next one. There were some waves in the sides, but after tapping the upper rails over while sandwiched in the vise the sides are nice and straight.
I used Turtle Wax on the sides of the angle iron and the flat. The ol "slicker than cat snot on a tile floor" approach worked well.
What thickness barstock are you using for the inner bars? What would be optimum 0.25''?LonghunterCO said:I could not find a thick enough piece for the inner bars so I tried using two with a third on the bottom. The bottom one was ever so slightly to the left so the inner was shifted too far to the right and therefore it was not leaving enough room for the flat to fold. So I am in the process of narrowing the lower plate to allow the bend. So a work in progress.
I only had access to the 3/16" stuff that he mentioned as bowing on page 1 or 2. 1/4" would be better.Thirdtxcav said:What thickness barstock are you using for the inner bars? What would be optimum 0.25''?
thanks
Let me see if we are on the same page, Are you talking about the angle iron that forms the sides, or are you talking about the two strips that are used to sandwich the flat and help form the bottom of the flat, where the mag well and trigger guard is mounted?LonghunterCO said:I only had access to the 3/16" stuff that he mentioned as bowing on page 1 or 2. 1/4" would be better.
I am trying to avoid welding if at all possible. I was thinking of backing up the interior of my male jig with a piece of Oak or similar hard wood, topped with another strip of barstock. This would then be used as a form for folding the top rails. It would also help to keep the jig straight as it is pulled through the outer jig.Rikoshay said:I used 2 strips of the 3/16th flat bar for the bottom section (3 total, 1 on top of the flat, 2 on bottom). I will be bracing the bottom 2 with some more flat strips welded at a 90 degree angle, running the whole length.