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| Metric threds |
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| Pete.:
Even with a gearbox, many lathes need changewheels especially the smaller ones and even more especially if you want to cut metric and imperial threads. The 127 tooth gear is required for perfect transposing though there are a couple of very close smaller alternatives. The Atlas uses 64 tooth gears (half of 128) which is very close. |
| DMIOM:
--- Quote from: AdeV on June 23, 2015, 04:34:53 AM ---..... how do you get the different sized gears to mesh properly, and why is a "tumble reverse" so called? Is that the same as the "tumbler" you mention in one of your posts above? --- End quote --- Ade - although the input (from motor) and output to leadscrew are fixed in space, the other pivot(s) aren't permanently fixed - typically there's a swinging, slotted arm (which can be known as the 'change gear bracket' or 'banjo') which allows you to position intermediate gear(s) to mesh with varying size drive- and driven- gears. Tumbler reverse is just inserting another pinion in between two existing gears so as reverse the drive direction. Dave |
| chipenter:
Ade the tumbler revese is the three gears in a triangle that pivot around the bottom gear , moving the second gear into contact with the lathe spindle reveses the drive to the lead screw , and leaving the left hand gear free , adjusting gears is just a thicnes of cartridge paper or untill they are quiet . |
| Jonny:
I haven't any change wheels with mine and regularly cut metric and imperial on same bar, just dial it in job done. Spindle 40T feeding 94T 94T feeds 44T 44T feeds 88T on Lead screw gives 56TPI to 3 1/4TPI or 0.2mm to 3.5mm pitch plus modular. Every things done with gearbox. Only have to swap round 44T to 88T and vice versa to cut from 4mm pitch to 14mm or 14TPI to 2TPI plus modular stuff. |
| chipenter:
--- Quote from: Jonny on June 24, 2015, 03:07:22 PM ---I haven't any change wheels with mine and regularly cut metric and imperial on same bar, just dial it in job done. Spindle 40T feeding 94T 94T feeds 44T 44T feeds 88T on Lead screw gives 56TPI to 3 1/4TPI or 0.2mm to 3.5mm pitch plus modular. Every things done with gearbox. Only have to swap round 44T to 88T and vice versa to cut from 4mm pitch to 14mm or 14TPI to 2TPI plus modular stuff. --- End quote --- My problem is the banjo spindle is fixed no groove to adjust for the gears . |
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