rdb241 Posted August 12, 2012 Report Share Posted August 12, 2012 Awhile back I purchased a 80% lower from Tactical Machining. I also bought there jig. Upon receiving my stuff, I put the lower in the jig. Clamped everything in a bench vise and started drilling the selector by hand. Well needless to say I messed it up. Not only was the hole not in the correct location but at an angle so the other side was way off. I work for a global airplane manufacturer and when a hole is drilled wrong they fix it with what is called a freeze plug. What a freeze plug is, it is a aluminum dowell that is slightly larger diameter than the hole you just drilled. Then they freeze the pug with liquid nitrogen or some other sud zero means. Then they press the cold plug into place and let it thaugh out. When it gets to ambient temp it swells for a super tight fit. Then the hole is redrilled correctly. If it works for airplane structure than why would it not work to repair the hole I drilled on the receiver? Well I did just that and it worked. I redrilled the selector hole using a drill prees and the hole is now perfect. I took some pics of the finshed hole and you can see where the bad hole was......I should have took pics before I started but did not think to. Enjoy the pics. I thought I would give everybody a heads up on repairing a bad hole.[img width=810 height=607]http://i473.photobucket.com/albums/rr97/rdb241/photobucket003.jpg Quote Link to comment Share on other sites More sharing options...
edgecrusher Posted August 12, 2012 Report Share Posted August 12, 2012 <thumbsup> , very cool and informative. Welcome to the forum. Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted August 12, 2012 Report Share Posted August 12, 2012 Welcome rdb241!Good fix on that.Jon Quote Link to comment Share on other sites More sharing options...
IM_JOHNNYV Posted August 12, 2012 Report Share Posted August 12, 2012 I also had a snafu when drilling a 0% raw forging, but mine was from not reading the drawing correctly - duhhhh...... My fix was with some aluminum dowels and Loc-Tite®, but I very much like the "Freeze Plug" approach... Great job Quote Link to comment Share on other sites More sharing options...
unforgiven Posted August 12, 2012 Report Share Posted August 12, 2012 Welcome from Indiana brother rdb,slick fix. <thumbsup> Quote Link to comment Share on other sites More sharing options...
rdb241 Posted August 13, 2012 Author Report Share Posted August 13, 2012 Thanx guys for the welcome. I have been building AK's for awhile and needed a different challenge. Quote Link to comment Share on other sites More sharing options...
SDDuc996 Posted August 19, 2012 Report Share Posted August 19, 2012 That was a great idea. Also, did you mill the sides of that lower (around selector and mag release) or do they come that way? Quote Link to comment Share on other sites More sharing options...
rdb241 Posted August 21, 2012 Author Report Share Posted August 21, 2012 That's the way the receiver came. I did take some 320 grit sand paper and kinda smoothed out the area around the new hole. Quote Link to comment Share on other sites More sharing options...
SDDuc996 Posted August 21, 2012 Report Share Posted August 21, 2012 Got it. Thanks bro. Quote Link to comment Share on other sites More sharing options...
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