straightening a shaft

I have a bent lead screw for a surface grinder which I would like to have
straightned. Does anyone have a recommendation for someone who could do
a superior job??
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Just a suggestion, homemade v blocks, hardwood and a heavy hammer? Once you get it close you can begin using your dial indicator to check for runout. How straight do you need the shaft? (humor not intended!)
John H.
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Much you don't say. How badly bent? How long? Hardened? What diameter? Bent in the threaded area or at the ends? IF bent in the threads, accuracy might be a thing of the past, bent end can be replaced if the screw isn't hard. If badly bent and hardened, chances of it cracking are good, if only a slight bend, it may come out. Straightening things in an arbor press isn't a black art, it's a PITA. How straight do you need it? Even the factory isn't perfect and have some tolerance for straightness. I can't name any right off hand, but there are places that do straightening, but depending on what you want, it might be cheaper than a new screw, or may be more expensive.
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Lennie the Lurker
A good dead-blow hammer would help you out... A little practice and it gets real easy...
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Kevin Beitz
They make shaft straightening presses. Like the arrow straightening jig already mentioned only capable of straightening shafts (barrels?) of much larger diameter. The press I have has a built in vee way, mounts a dial indicator, and has a screw press on top in the center. It is a one piece casting about two feet long. I had a much larger one a couple of years ago. It was about 4' long and had its own stand. These are purpose built machines which were somewhat common years ago. The screw press gives a better feel than hydraulic, and can apply a precise amount of movement. It would be relatively simple to make one to do 1/4" rod. Paul
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