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If I read you correctly Ed you are saying to have stops for the dies on three sides but leave the fourth open instead of trapping the die completely in place on the quick change holder? I do not doubt you, I just want to make sure I understand it.
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Yes...and leave "slop" on the sides too! When I first started building dies for my first forging press, I had a mock-up of the die holders on the welding bench.... I made sure everything was nice and tightly fit, clamped in place with vise-grips before welding, and gently tack welded all around so things didn't "move" and then welded the snot outta everything.
The slipped onto the press like a key in a keyhole! WOOT!! What I didn't take into consideration was the dies heating up and expanding when on the press/in use...... even after cooling, they would not come off, until I took the crowbar to them. Lesson learned! "Slop" in how dies fit on a press is a GOOD THING.
And! You are absolutely right about the drawing! I had a DUH moment.... I was looking at the SECOND drawing when I thought about/wrote that..... so NIXX what I said there! Thanks for catching that!! Saying what I did surely muddied the waters. After going back.... they are both the way I'd say to do them!