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| screw cutting dial |
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| loply:
Personally I never use the threading dial when threading. Leave the half nuts engaged permanently until the entire job is done. When I get to the end of a pass I kill the motor, wind out the cross slide one turn, reverse the lathe on the motor till I'm back at the start point, then wind the cross slide back in and repeat. |
| BillTodd:
--- Quote ---One solution, if the construction of his lathe permits, would be to add an extension to his leadscrew at the tailstock end, threaded at the same pitch (though it needn't be the same diameter). Then, a threading dial could be mounted on the end of the bed, where he can get at it to change the worm wheel. --- End quote --- I believe the dial has to move with the carriage to maintain sync with the lead-screw position. |
| BillTodd:
Just read this in Tony's lathe site: --- Quote from: Lathes.co.uk ---The clutch and brake lever also doubled to control the forward and reverse return of the carriage - and for setting semi or fully-automatic screwcutting cycles (though the latter required extra equipment in the form of the d32* threading accessory). When used for the batch production of threaded components the four-times accelerated reverse was especially useful and, of course, eliminated the need to disengage the clasp nuts. Unfortunately the electrical controls were clustered in a vertical line low down on the front face of the tailstock end plinth -thus leaving them conveniently out of reach as the operator was wound into the mechanism. Screwcutting was by changewheels that, being fitted to large diameter studs and retained by quickly detachable locking discs, were easily dismounted and replaced. There was no option of a screwcutting gearbox, the makers deciding instead to offer the convenience of a well-thought-out power-feed system that enabled the operator to set the most appropriate cutting speed with the minimum of effort (a change in the power sliding or surfacing feed rate did not disturb the screwcutting setting) --- End quote --- This sounds like the machine has a Hardinge like screw cutting system :) You may not need a threading dial at all, just a user manual :). Bill |
| andyf:
--- Quote from: BillTodd on August 26, 2011, 11:53:17 AM ---I believe the dial has to move with the carriage to maintain sync with the lead-screw position. --- End quote --- I hadn't thought it through, Bill; you're quite right. Andy |
| AcieraF3:
Thanks all, :mmr: Did some practice thread cutting with the half nut engaged and using the electric brake to forward and reverse the machine.......works great. Actually I do have a manual but it is in German :bang: |
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