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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="vince998" data-source="post: 42346" data-attributes="member: 261"><p>I believe it´s called Galling?</p><p>Rolled to rolled or cut to cut threads work well. the problem starts when you mix a rolled with a cut thread. the rolled thread has a radius at the crest and the root of the thread. A cut thread should also have a small radius, but to different dimensions to a rolled/formed thread. The cut peak will sieze (gall) in a rolled root. (this applies to all materials)</p><p>Industrial produced nuts and bolts all have a tolerance range to maximise tool usage/life. A screw or bolt produced on old tooling (therefore at the upper range of its tolerance and larger in dia) has minimum clearance in a nut also produced on old tooling (smaller internal Dia)</p><p>Allways use matched taps and dies when cutting external/internal threads, as to close a flank tolerance will also cause this. If in doubt as to the nut/bolt finishing tolerance, run your cutters down/over them first.</p><p>I have tried fitting cylinder studs (cut thread) to new crankcases (formed threads as common practice (and stronger than cut threads in aluminium) in CNC production nowdays) in the past. The only way to get them in was to chase the case threads with a tap.</p></blockquote><p></p>
[QUOTE="vince998, post: 42346, member: 261"] I believe it´s called Galling? Rolled to rolled or cut to cut threads work well. the problem starts when you mix a rolled with a cut thread. the rolled thread has a radius at the crest and the root of the thread. A cut thread should also have a small radius, but to different dimensions to a rolled/formed thread. The cut peak will sieze (gall) in a rolled root. (this applies to all materials) Industrial produced nuts and bolts all have a tolerance range to maximise tool usage/life. A screw or bolt produced on old tooling (therefore at the upper range of its tolerance and larger in dia) has minimum clearance in a nut also produced on old tooling (smaller internal Dia) Allways use matched taps and dies when cutting external/internal threads, as to close a flank tolerance will also cause this. If in doubt as to the nut/bolt finishing tolerance, run your cutters down/over them first. I have tried fitting cylinder studs (cut thread) to new crankcases (formed threads as common practice (and stronger than cut threads in aluminium) in CNC production nowdays) in the past. The only way to get them in was to chase the case threads with a tap. [/QUOTE]
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