Thread: Turning hard materials
I'm having difficulty turning the ends of my ball screws down. The material seems pretty hard and it seems to be a lot of hassle to get things to cut and then it turns out pretty sloppy and inaccurate with a terrible finish.
Am I best going with a toolpost grinder or is there some trick or other turning tool I could try?
Easiest way is just to anneal the end of the screw. Heat up the end and wrap a damp cloth round slightly further back to stop most of the heat conducting down the screw.
If you're careful you'll end up with maybe 10-20mm of the portion you're not machining no longer hard ... but if your ballnut doesn't go that far then it's nothing to worry about.
The Following User Says Thank You to Jonathan For This Useful Post:
as Jonathan says annealing is not that hard to do. if the screw is not too long, you can put the screw in a bucket of water with the part you want to anneal sticking out of the water. also remember that after annealing you will most likely need to straighten the screw and you will be best to use a collet rather than a chuck.
For the visual type:
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So, all you need is a convenient induction heating unit! I was a little surprised at the straightening that was done. Assuming that any distortion would occur in the annealed section or at the boundary between that and the "left hard" section, wouldn't any slight loss of straightness be taken care of in the machining? If you are using the untouched threads to hold the screw (decent collet, etc) then I would have centre-drilled, brought up my tailstock centre, and just turned to dimension, confident that the turned part was going to be concentric with the body of the screw. What have I missed?
Perhaps I should stop resisting....
I used my Mum's cooker to heat it - it's a gas hob. Better off using something with a bit more power output though.
https://github.com/joshcam/ReactorFo...ctorForge-Core but decided a good Mapi gas blow lamp would achieve the same result cheaper..Clive
I have a propane torch with range of burners from tiny to teenage dragon flame sizes. One should match "Mum's gas hob" plus a bit!
Thanks - always good to hear from someone who's actually done the job.
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