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plunger
06-25-2019, 03:41 AM
I am intersted in buying another emco v13. I have only seen pics of it. Missing are the change gears and follow and steady rest as well as the face plate and 4 jaw.

How difficult would it be to make the ten missing gears.? If they are not perfect does it really matter .By this I mean I have never made a gear so I dont know how much accuracy in terms of thread cutting could be lost if they are not perfect.
I have no gear cutting equipment but have a milling machine and a universal dividing head..I assume that one gear cutter would cut all ten gears irrespective of whether its a 40 tooth or 90 tooth.

Also I wonder how hard it would be to cast the follow rest and steady rest. I have no casting equipment. Could this be done in aluminium or is it not a suitable material.

MattiJ
06-25-2019, 04:33 AM
You need different cutter for 40 tooth and 90 tooth. ie. https://www.aliexpress.com/item/New-Arrival-Module-1-PA20-Degrees-Bore-22mm-1-8-HSS-Involute-Gear-Milling-Cutter-Gear/32853752370.html?spm=2114.search0104.3.1.6bed6c98U gZpQz&ws_ab_test=searchweb0_0,searchweb201602_8_10065_10 068_319_10059_10884_317_10887_10696_321_322_10084_ 453_10083_454_10103_10618_10304_10307_10820_10821_ 537_10302_536,searchweb201603_52,ppcSwitch_0&algo_expid=d11c9037-b09a-4455-9be5-33840cdc146c-0&algo_pvid=d11c9037-b09a-4455-9be5-33840cdc146c&transAbTest=ae803_3
I don't think accuracy is going to really be a problem with homemade gears but they can be lot noisier than quality gears. V13 probably uses standard metric module gears so you might be able to source these as a ready-made item. (possibly re-bore or install bushings)
Noise can also mean vibration and surface finish problems if you need to do precision work.

Do you ever need all of the 10 missing gears? IIRC V13 had pretty comprehensive threading/feeds gearbox so many of the change gears are only needed for strange pitches like MOD and DP.

No point of casting the steady or follow rest, for one-offs its easier/faster to fabricobble them from steel weldments. IE. cut and weld from heavy-wall 2" square RHS or solid pieces of 2" thick steel.

plunger
06-25-2019, 11:57 AM
You need different cutter for 40 tooth and 90 tooth. ie. https://www.aliexpress.com/item/New-Arrival-Module-1-PA20-Degrees-Bore-22mm-1-8-HSS-Involute-Gear-Milling-Cutter-Gear/32853752370.html?spm=2114.search0104.3.1.6bed6c98U gZpQz&ws_ab_test=searchweb0_0,searchweb201602_8_10065_10 068_319_10059_10884_317_10887_10696_321_322_10084_ 453_10083_454_10103_10618_10304_10307_10820_10821_ 537_10302_536,searchweb201603_52,ppcSwitch_0&algo_expid=d11c9037-b09a-4455-9be5-33840cdc146c-0&algo_pvid=d11c9037-b09a-4455-9be5-33840cdc146c&transAbTest=ae803_3
I don't think accuracy is going to really be a problem with homemade gears but they can be lot noisier than quality gears. V13 probably uses standard metric module gears so you might be able to source these as a ready-made item. (possibly re-bore or install bushings)
Noise can also mean vibration and surface finish problems if you need to do precision work.

Do you ever need all of the 10 missing gears? IIRC V13 had pretty comprehensive threading/feeds gearbox so many of the change gears are only needed for strange pitches like MOD and DP.

No point of casting the steady or follow rest, for one-offs its easier/faster to fabricobble them from steel weldments. IE. cut and weld from heavy-wall 2" square RHS or solid pieces of 2" thick steel.

I hear you about it being easier to do afab job but they are such nice lathes ,it would be nice to have something as close to original.Most of the metric threads are covered by 40,80 and 127/120t. Personally I only use imperial 14,11 and 18 and 19tpi. But it would be nice to have the whole lot.

wmgeorge
06-25-2019, 12:41 PM
When I had mine and it needed a gear I just ordered one. I had a Super 11, company in the Eastern US had parts on hand. They are still made.... I Think and sold mostly in Europe.

plunger
06-25-2019, 12:57 PM
When I had mine and it needed a gear I just ordered one. I had a Super 11, company in the Eastern US had parts on hand. They are still made.... I Think and sold mostly in Europe.

I think the gears will cost more than the lathe

wmgeorge
06-25-2019, 05:29 PM
I think the gears will cost more than the lathe

Well for my Super 11 that sells for about 12 k USD less the options the parts for the headstock gearbox, oil and gasket came to around $200 USD. This is not a Chinese made Enco but this http://www.lathes.co.uk/emco-v13-lathe/