Gallery, Projects and General > Project Logs
Getting a tacho drive fixed on a classic racing bike
bogstandard:
Stew,
It is actually a fairly easy exercise.
Clamp the one half of the crankcase to the mill table. Centre up on the main bearing. Put the outer cover back on, and bore away to fit a new threaded bush. Spot on centre.
John,
I didn't want to do any single point cutting until I was properly prepared for it, and to really check everything out, and catalogue my findings. Unfortunately this job came along and I was forced to do it.
I had already given your charts a good dose of looking at, but as you know, sometimes there is a great deal of difference between theory and practice. This time, it looks like your theory is spot on, and I will have a lot less trepidation when it comes for me to do some more imperial threading. Nice one.
But one thing I must get done is the retracting toolpost. What I was doing today was a real PITA.
In fact this lathe has really surprised me. I have used all sorts of change geared lathes, and have spent hours setting up gear trains to get just what I wanted, but this one was so easy, with the built in selectable box and a couple of gear swaps, it was all done in about 5 minutes. The only problem is that now I have to get back in there and put it all back to how it was. I had set it up for really nice fine feeds.
Bogs
John Hill:
--- Quote from: bogstandard on September 10, 2009, 06:02:42 PM ---In fact this lathe has really surprised me. I have used all sorts of change geared lathes, and have spent hours setting up gear trains to get just what I wanted, but this one was so easy, with the built in selectable box and a couple of gear swaps, it was all done in about 5 minutes. The only problem is that now I have to get back in there and put it all back to how it was. I had set it up for really nice fine feeds.
Bogs
--- End quote ---
John, your comments give me great confidence that this, my first and doubtless only lathe, was a good choice.
I think my favourite handle on the gear head is the one marked 'I' 'II', instant change between fine and really fine! :med:
bogstandard:
John,
My favourite as well, but I wish it had synchromesh on the screw fwds/rev lever, it is a real pain stopping the machine to feed the other way.
John
Bernd:
John,
Very nice write up on threading. :thumbup:
You explained it exactley the way I learned it, except for the imperial thread cutting on a metric lathe. People should now be pointed in this direction when they ask how to single point threads.
Bernd
John Hill:
--- Quote from: bogstandard on September 10, 2009, 06:20:00 PM ---John,
My favourite as well, but I wish it had synchromesh on the screw fwds/rev lever, it is a real pain stopping the machine to feed the other way.
John
--- End quote ---
Fortunately the fwd/rev lever has a neutral position so maybe a cunning Madmodder could fit a seperate electric motor to drive the feed box? Cutting feeds only as that would not be practical for thread cutting.
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