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Bandersnatch20/01/2020 02:03:13
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Posted by Michael Gilligan on 19/01/2020 20:04:37:

First; there are two sets of jaws available

Second; the other features of the workpiece [length,weight, surface finish, etc] all need to be considered

Third; need to take into consideration the type of machining to be done.

In these litigious times, Suppliers may feel more comfortable simply avoiding the issue and letting the user make his/her own considered decision.



I don't doubt you're right. Seems a pity that they can't simply give a reliable OD for external holding with the "normal" jaws though and add a disclaimer that it depends on etc etc. Which would at least give potential buyers the basic information they need.

Michael Gilligan20/01/2020 05:38:04
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I did find someone quoting the basic numbers [for a larger and pricier chuck.] : **LINK**

https://www.mscdirect.com/product/details/08573065?fromRR=Y

But I don’t really feel much better-informed.

MichaelG.

JasonB20/01/2020 06:56:47
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Fairly common to find holding capacity for actual chucks,  but I have never seen it given in a lathe spec though they usually at least give the chuck diameter (at least on lathes supplied with a chuck)

Edited By JasonB on 20/01/2020 07:28:05

Hollowpoint20/01/2020 09:27:33
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Posted by Ron Laden on 19/01/2020 08:17:17:

Having had a mini lathe I think a couple of points worth considering is to go for one with a 100mm chuck, 400mm between centres and a 500 watt motor (ideally brushless direct drive)

If I was buying one now it is what I would aim for.

I agree, there are better versions of the mini lathe than the clarke, and they are much cheaper too. Warco, arc euro and amadeal seem to have the best price/performance ratios.

Edited By Hollowpoint on 20/01/2020 09:28:10

ega20/01/2020 11:01:07
1436 forum posts
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To their credit, some chuck makers mark the jaws to indicate how far they may safely be used when projecting from the body (by "safely" I mean without undue risk of tooth breakage).

Nicholas Farr20/01/2020 15:40:14
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Hi, I agree with ega's words of wisdom, which is how I uderstood the marks and I have a 100mm 3 jaw with such marks, which will allow 100mm diameter max solid bar to be held with the outside jaws or a 100mm inside diameter max, piece of tube with the inside jaws. My 80mm on my mini lathe however, will only allow 70mm with the above stated limits, although a near to chuck diameter could be done with only the lightest holding pressure, as the No. 3 jaw will be on its last tooth. Hope this helps.

Regards Nick.

P.S. the other limiting factor to consider, is the amount the jaws sticking out of the chuck, don't catch any part of the saddle in such occasions that the saddle passes under the chuck during the work progress.

Edited By Nicholas Farr on 20/01/2020 15:48:51

Michael Gilligan20/01/2020 16:02:12
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Posted by Nicholas Farr on 20/01/2020 15:40:14:

.

[...] My 80mm on my mini lathe however, will only allow 70mm with the above stated limits, although a near to chuck diameter could be done with only the lightest holding pressure, as the No. 3 jaw will be on its last tooth. Hope this helps.

Regards Nick.

.

... and it's perhaps worth noting that the 6" PBA chuck that I linked earlier only claims a maximum capacity of 5"

MichaelG.

JasonB20/01/2020 16:11:15
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Bison give quite a good idea of what the chucks will hold, see the second page of this PDF

Still does not show them being used like this though where you could hold work upto the max swing of your lathe.

Nicholas Farr20/01/2020 16:22:15
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Hi, that's just cheating Jason, point contact and all that wink 2 but I have done similar myselfangel 2

Regards Nick.

Michael Gilligan20/01/2020 18:06:32
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14764 forum posts
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Posted by JasonB on 20/01/2020 16:11:15:

[...]

Still does not show them being used like this though where you could hold work upto the max swing of your lathe.

.

... which, I think, nicely demonstrates the point I was making 19/01/2020 20:04:37:

MichaelG.

Howard Lewis20/01/2020 22:20:26
2730 forum posts
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The C3 mini lathe manual quotes a 180 mm maximum swing over the bed. The maximum DIAMETER over the Cross Slide is likely to be 100 mm, from memory.

With regard to the maximum size that can be held by a chuck will depend on whether bar or hollow.

100mm bar over the Cross Slide, but a ring upto 180 mm external diameter could be held by chuck jaws gripping the internal diameter, as long as it does not try to pass above the Cross Slide.

Personally, I am not a fan of Machine Mart. The local branch lost my confidence years ago. If I were buying a new lathe, I would rather deal with one of the Model Engineering suppliers.

Having had no experience of Axminster or or Amadeal, cannot comment. But ranked by my experience of other suppliers, my preference would be Arc Euro, Warco and then Chester. But these are purely my preferences, others may have had different experiences.

Howard

Edited By Howard Lewis on 20/01/2020 22:21:16

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