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Ideal amateur lathe spindle nose?

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Michael Gilligan07/11/2019 20:26:54
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This is the general idea, Niels : **LINK**

https://forum.snipershide.com/threads/lathe-spider-chuck.5619/

... effectively, you are using the whole of the spindle like a watchmaker’s bell-chuck on steroids !!

See here: http://www.lathes.co.uk/george-adams/page12.html

MichaelG.

Edited By Michael Gilligan on 07/11/2019 20:30:42

Niels Abildgaard08/11/2019 06:48:29
260 forum posts
89 photos
Posted by Michael Gilligan on 07/11/2019 20:26:54:

This is the general idea, Niels : **LINK**

https://forum.snipershide.com/threads/lathe-spider-chuck.5619/

... effectively, you are using the whole of the spindle like a watchmaker’s bell-chuck on steroids !!

See here: **LINK**

MichaelG.

Edited By Michael Gilligan on 07/11/2019 20:30:42

Hello Michael

That was exactly what I needed to go on with my living room oilfield lathe.

Thank You very much

old mart08/11/2019 16:47:10
1101 forum posts
113 photos

If you were designing a lathe chuck mounting for a small to medium lathe, the screw thread takes a lot of beating. At the design stage, a positive spindle lock and a locking device for running safely in reverse would not be difficult to include. My second choice would be a variation of the bolt on flange which the mini lathes have, but with more room between the headstock and the rear of the spindle flange. The type with the keyholes in a loose plate has a lot going for it in terms of easy chuck changing.

I think the camlock system is more suitable for larger machines.

Edited By old mart on 08/11/2019 16:50:08

Niels Abildgaard08/11/2019 19:09:32
260 forum posts
89 photos
Posted by old mart on 08/11/2019 16:47:10:

If you were designing a lathe chuck mounting for a small to medium lathe, the screw thread takes a lot of beating. At the design stage, a positive spindle lock and a locking device for running safely in reverse would not be difficult to include. My second choice would be a variation of the bolt on flange which the mini lathes have, but with more room between the headstock and the rear of the spindle flange. The type with the keyholes in a loose plate has a lot going for it in terms of easy chuck changing.

I think the camlock system is more suitable for larger machines.

Edited By old mart on 08/11/2019 16:50:08

I have come to the conclusion after reading the late,great John Stevenson and having done some practical tests my self, that my chucks will be fastened with three or four M6 or M8 screws from front.

Short and very rigid.

Extreme accuracy by machining spindle register on site

For my former 30mm hole spindle it should have been made like this:New spindle

Edited By Niels Abildgaard on 08/11/2019 19:10:29

Edited By Niels Abildgaard on 08/11/2019 19:31:29

Niels Abildgaard08/11/2019 19:12:58
260 forum posts
89 photos

And for my next 50mm hole spindle something like this

mega.jpg

old mart08/11/2019 21:06:14
1101 forum posts
113 photos

Most three jaw rear mounting scroll chucks can have the holes drilled through to the front. If the original holes are 8mm, then drill them 6.2 through to the front and counterbore them for 6mm SHCS. You will find that is is possible to drill another three holes on the same pcd, usually so all the holes are spaced at 60 degrees, ( check first though for space). SIX holes are plenty for your threaded flange. Four jaw independent chucks are commonly front fixing and would be easier.

Niels Abildgaard03/12/2019 18:28:03
260 forum posts
89 photos

My latest 8*16 import lathe spindle phantasy:

Buy one of these.:

38mm bore lathe

 

and two 32912 bearings and make a spindle with 50mm hole and max88mm nose as picture.

You cannot buy suitable 3 or 4 jaw chucks with 50mm hole and is not really needed either.

Everything round up to 38mm is handled with ER collets.

Bigger and square by Harold Halls very nice faceplate /clamp combination.

Overhang is short and bending stiffnes between bearings is 65 for a 30/20mm ,201 for the 45/38mm as bougth and 671 for the ultimate 60/50mm shown.

Spindle Porn

Edited By Niels Abildgaard on 03/12/2019 18:37:30

Edited By Niels Abildgaard on 03/12/2019 18:39:12

old mart03/12/2019 19:13:15
1101 forum posts
113 photos

Having a tight tapered fitting is fine in theory, but allowing a small amount of radial adjustment means you can fine tune the runout to zero.

JasonB03/12/2019 19:27:24
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Posted by old mart on 03/12/2019 19:13:15:

Having a tight tapered fitting is fine in theory, but allowing a small amount of radial adjustment means you can fine tune the runout to zero.

That does not seemed to have bothered the likes of Hardinge who also have their collet taper machined directly into the spindle bore.

old mart03/12/2019 19:34:30
1101 forum posts
113 photos

So do a lot of lathes, including Smart & Brown, they rely on the collets being perfect.

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