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| Swingup external threading tool |
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| Ned Ludd:
Hi Guys, Can't help but think that the tool will have to rise clear of the work, even if it doesn't cut there will surely be a side ways force trying to bend the pivot. Didn't want to be the first to bring this up, the last time I commented, about the retracting tool holder, Mr Standard stopped work on it. :( Ned Ludd PS now found camera and charger, so will soon post piccies, I hope. |
| NickG:
There won't be any sideways force, as the vertical component of the force (due to angle of thread and relief angle on tool) will push the tool upwards as there is nothing holding it down. So the tool should ride up a bit further on the thread flank. Lets wait and see. Nick |
| jim:
i'm really looking forward to a vid of this in action. looking real good :clap: |
| khand:
I made a holder for some carbide threading inserts about a month ago and was planning on making it retractable but I like your idea a lot better. Can't wait to see how this turns out. |
| Bernd:
Bogs, I'm not trying to destroy the concept. I'm wondering out loud about the backlash you have in the gearing between the chuck and the carriage moving so the tool will stay in the cut slot of the thread. It's the same principle as withdrawing the cross slide and having to go past your setting and then back in to take up the backlash. That's what I was thinking about. Bernd Note Added: Just did a test on my Logan lathe. Set up for 20 threads. Ran machine in forward, as if cutting threads. Then reversed the motor. It took a 1/4 of a turn on the chuck before the lead screw started to turn and one full turn of the chuck before the carriage started to move. I must have one sloppy lathe when it comes to back lash then. |
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