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Tool post milling attachment

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shipto:

--- Quote from: vtsteam on December 25, 2024, 07:56:52 PM ---Can you fix the gear in the gearbox, shipto?

--- End quote ---
Probably but it would require stripping much of the front end of the lathe I think for a gear I will probably never use again. If it was something more important then I would give it a go but for this probably not.

shipto:

--- Quote from: BillTodd on December 26, 2024, 05:41:05 AM ---Could you try driving the spindle via the screw cutting box , rather than driving the spindle directly (as normal). This should take a lot of the load off of the SC gears, which might (with luck) just be springing apart?

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I am struggling to get what you mean, are you suggesting driving the screw cutting shaft? if so not sure how I would do this.

BillTodd:
Yes.  The problem cutting low tpi (long pitch) screws is that the gearbox has to spin faster, or almost  as fast as, than the spindle . This puts an enormous load on gears that are primarily designed to reduce the speed. If you can turn the lead screw and let the gears drive the spindle,  the gears and shaft are loaded far less.

shipto:

--- Quote from: BillTodd on December 26, 2024, 04:17:29 PM ---Yes.  The problem cutting low tpi (long pitch) screws is that the gearbox has to spin faster, or almost  as fast as, than the spindle . This puts an enormous load on gears that are primarily designed to reduce the speed. If you can turn the lead screw and let the gears drive the spindle,  the gears and shaft are loaded far less.

--- End quote ---
makes sense, will bear this in mind if I ever need to do this again. Thinking about it an extension to the end of the leadscrew run from a wormgear box would do it.

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