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Bantam metric leads crew & half nut

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Dan Shilling27/05/2021 12:28:52
6 forum posts

I've bought a Colchester Bantam, it's metric but I need a metric leadscrew & half nut to complete the machine.

I can get from a Colchester lathe Specialists a new leadscrew for £375+vat but though the machine's good it would not justify that price especially as I have already paid near on £400 for it.

Imperial is findable but metric seems impossible to find a good leadscrew & half nut.

So I was wondering on the off chance if anybody had a spare metric leadscrew and half nut for a Bantam or was breaking one?

Regards,

Simon

Dan Shilling30/05/2021 11:17:31
6 forum posts
Posted by Dan Shilling on 27/05/2021 12:28:52:

So I was wondering on the off chance if anybody had a spare metric leadscrew and half nut for a Bantam or was breaking one?

Any suggestions would be welcome.

Dave Wootton30/05/2021 13:15:04
196 forum posts
51 photos

Hi Dan

I bought lengths of Metric leadscrew from a company called Kingston engineering from hull, they also sold nut blanks, no idea of the cost as it was for work and they sorted out the grubby details of money. Was a while ago but i see they have a website. I'm sure there was a firm in Bristol that sold it as well.

Dave

There is a firm called Nobilla that breaks Colchester lathes, but their prices are not bargain basement! However I bought a used Bantam tailstock spindle from them described as good condition, but when it arrived it was as good as new , in fact I think it was unused, so I was delighted. The chap that told me of them said they are very fussy about the condition of what they sell.

Edited By Dave Wootton on 30/05/2021 13:29:03

Edited By Dave Wootton on 30/05/2021 13:34:04

not done it yet30/05/2021 19:17:49
6251 forum posts
20 photos

Do you already have a lead screw? If so, one possibility is to replace the threaded portion with a metric trapezoidal screw thread.. Half nuts might likely depend on the machine design.

Kingston engineering would quote you for a replacement lead screw with nuts, I expect. I have seen several mentions of Kingston, on this and other fora in the past. All reports have been favourable, but I’ve never needed to avail myself of their services....

Dan Shilling30/05/2021 20:27:52
6 forum posts
Posted by Dave Wootton on 30/05/2021 13:15:04:

There is a firm called Nobilla that breaks Colchester lathes, but their prices are not bargain basement!

yes they only have new and that's where the £ 375 and the nut £100 then vat on top! comes from. Would be fine if the machine was hardly used but as it's 45 years old a good second would be more suitable.

I'll look into the kingston option - I do have an imperail leadscrew and half nut

Dan Shilling30/05/2021 20:30:36
6 forum posts
Posted by not done it yet on 30/05/2021 19:17:49:

Do you already have a lead screw? If so, one possibility is to replace the threaded portion with a metric trapezoidal screw thread.. Half nuts might likely depend on the machine design.

Kingston engineering would quote you for a replacement lead screw with nuts, I expect. I have seen several mentions of Kingston, on this and other fora in the past. All reports have been favourable, but I’ve never needed to avail myself of their services....

I'll look into the kingston option though I have not fully given up finding a good second hand metric leadscew and half nut - seems rare as hens teeth!

Brian Wood30/05/2021 20:35:07
2435 forum posts
37 photos

Hello Dan,

I am surprised that no-one else has mentioned it before now , but surely there are change wheel arrangements that will give you metric threading using an imperial leadscrew. Are there no guidance set ups in a plate fastened to the change wheel cover or elsewhere on the lathe? It would save you a lot of money and the approximations are usually remarkably close.

Brian

Dan Shilling30/05/2021 20:54:50
6 forum posts
Posted by Brian Wood on 30/05/2021 20:35:07:

Hello Dan,

I am surprised that no-one else has mentioned it before now , but surely there are change wheel arrangements that will give you metric threading using an imperial leadscrew. Are there no guidance set ups in a plate fastened to the change wheel cover or elsewhere on the lathe? It would save you a lot of money and the approximations are usually remarkably close.

Brian

With the 127t change wheel -that I don't have - you can get approximately the metric back just like you can on an imperial machine but some threads such as modular won't work not that anybody tends to make these.

It's just if I could get a metric leadscrew it would complete the machine and I could set the machine straight from the plate without fussy calculations and approximations all the time.

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