Sam Salvati Posted October 17, 2010 Share Posted October 17, 2010 On Monday when I get back to my laptop, i'll try to take a video today also. I was forging anchors, one single piece and a two piece both single fluke. Quote Link to comment Share on other sites More sharing options...
Fosterob Posted October 17, 2010 Share Posted October 17, 2010 :D :D Thats a good one. Quote Link to comment Share on other sites More sharing options...
Sam Salvati Posted October 17, 2010 Share Posted October 17, 2010 Stewart, I agree 100%, like any punched hole done hot it's a touch sloppy. I would make my life even easier, hot punch the hole undersize then drill to the right size you'd take less time as you are drilling out less material, like a pilot hole. Quote Link to comment Share on other sites More sharing options...
bkforge Posted October 18, 2010 Share Posted October 18, 2010 Hot punch slightly undersized and drift from both sides as the metal cools to get a more accurate dimension. If you upset the drift slightly you can make up for the size change due to heat. Mark Aspery demo'd that, was pretty impressive--think he did three hammer blows for a half inch drift. Quote Link to comment Share on other sites More sharing options...
Nakedanvil - Grant Sarver Posted October 18, 2010 Share Posted October 18, 2010 Hot punch slightly undersized and drift from both sides as the metal cools to get a more accurate dimension. If you upset the drift slightly you can make up for the size change due to heat. Mark Aspery demo'd that, was pretty impressive--think he did three hammer blows for a half inch drift. I used to barrel drift holes out to size and could usually get 1-1/2" hole to size withing .005 +or-. Shrinkage is very close to .010 per inch from 1500F, so for a 1-1/2" hole I would make my barrel drift .015" big. Quote Link to comment Share on other sites More sharing options...
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