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| Swingup external threading tool |
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| sbwhart:
Penny dropped now John :thumbup: Great work Stew |
| Stilldrillin:
"I can see clearly now the rain has gone"....... ::) Gotcher..... Now! :thumbup: Great work John. David D |
| Bernd:
Like Marv, I had the same question as to how exactly it was supposed to function. What hasn't been mentioned is the backlash or gear wind up in the gearing system of the lathe. When reversing the lathe wouldn't there be a delay from the time that chuck starts to spin backwards to the time the lead screw starts moving the carriage backwards? Seems to me the tool would be cutting the backside of the thread you just cut or even maybe cut the thread in half depending on the gear train backlash. To me it would see that if there was "0" backlash through the whole gear train a swingup threading tool wouldn't be needed. Perhaps Marv is right in his assumption that the tool should be lifed clear of the work altogether! Bernd |
| Darren:
Bernd, I believe because the tool can lift then there will be no pressure to do any cutting (even with the back edge) The tool should simply ride the waves. |
| NickG:
Bernd, Good point about the backlash, I've wondered that too but I think as Darren says it will just ride up the thread a little and it's going in reverse so there isn't a cutting edge on the work. Might put minor marks on it but doubt it the pressure will be so light it would just be like a nut going up the thread. Nick |
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