How long a thread can be rolled with a axial 3 roll style thread head on a screw machine? We tried but get a very poor looking start, and the pitch diameter varied too much to run successfully. Tried a 1.125-12 thread 1.75 long in 1144 CD. Thread size what right in the middle of what the manufacturer rated the head for. Has anyone tried this?
Shop Doc Forum » Screw Machine Issues
Axial threadrolling
(5 posts) (3 voices)-
Posted 2 years ago #
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Are you holding your diameter to size? You might try putting coolant to the cutting area because it gets extremely hot. You need a shave tool holder or ground stock. The feed to the cam in the gear ratio may be incorrect. You also should check whether the machine horsepower is adequate. That thread roll which must be a mighty big one.
I would suggest looking at a Wickman and do the part with a single point threading attachment off the cross slide. 1144 material is brutal to try to thread roll. Too abrasive and stringy.
Posted 2 years ago # -
Are you holding your diameter to size? You might try putting coolant to the cutting area because it gets extremely hot. You need a shave tool holder or ground stock. The feed to the cam in the gear ratio may be incorrect. You also should check whether the machine horsepower is adequate. That thread roll which must be a mighty big one.
I would suggest looking at a Wickman and do the part with a single point threading attachment off the cross slide. 1144 material is brutal to try to thread roll. Too abrasive and stringy.
Posted 2 years ago # -
The blank was shaved with carbide tooling, held well. The head although it was rated at 1.125 fine pitch seems a little small. Fette 233400, this head works fine on CNC lathes. I suppose the aux. feed cam was not exactly right, the mechanism flexs...
Posted 2 years ago # -
A thread of this size should not be a problem we have ran up 5"-6" long but you must have your cams and gears right.
Fette has the best customer support give Dick Hagenbach a call 216-403-4853Posted 2 years ago #
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