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| Swingup external threading tool |
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| bogstandard:
If you had read and inwardly digested my basic description on how it should work, you should have realised that the chuck is running in reverse. So how could it cut with the metal being turned away from the cutting edge? Rather than destoying the concept and jumping to conclusions before proven, wait for the results. Only then should suggestions and criticisms be brought forwards. Bogs |
| andyf:
To my mind, the best way to think of it is that it works like a simple hinged clapper box on a shaper. It lets the tool skid over the surface when the spindle is reversed to run the carriage back, just as the shaper tool does on the return stroke. At least, that's what it's supposed to do - I'll be sorry I ever mentioned the idea if Bogs finds it doesn't work now he has put so much additional thought and effort into it. Andy |
| Darren:
John, Bernd did say in his post that the chuck would be turning backwards :thumbup: On my mini lathe there was no backlash worth mentioning, so reversing the machine without retracting the tool was fine. On my old Union lathe there was plenty of backlash, if the tool wasn't retracted it would cut the thread off quite merrily even though only the back of the tool was in contact with the work. I think this is was Bernd was referring to? |
| Darren:
--- Quote from: andyf on December 08, 2009, 10:11:08 AM ---To my mind, the best way to think of it is that it works like a simple hinged clapper box on a shaper. It lets the tool skid over the surface when the spindle is reversed to run the carriage back, just as the shaper tool does on the return stroke. Andy --- End quote --- Nice comparison Andy :thumbup: |
| 75Plus:
--- Quote from: andyf on December 08, 2009, 10:11:08 AM --- I'll be sorry I ever mentioned the idea if Bogs finds it doesn't work now he has put so much additional thought and effort into it. Andy --- End quote --- My guess is that Bogs is NOT reinventing the wheel he is just finessing it a bit. :D :D Joe |
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