12.5mm Collets

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Alan Bain - 22 Jan 2006 22:51 GMT

My Lorch-Schmidt lathe uses 12.5mm collets and I have a few missing
from the set -- I'm tentatively trying and find out how standard
these are as an item. After asking around at Alexandra Palace
juding from the blank looks most people seem to think I've got
the dimensions wrong! From my initial perusal of some catalogues they
aren't standard at all -- Schaublin seem to use 12mm as their standard.

The set I have are partially Lorch and some Crawford (CC).

Alan Bain

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Mark_Howard - 23 Jan 2006 20:20 GMT

> My Lorch-Schmidt lathe uses 12.5mm collets and I have a few missing
> from the set -- I'm tentatively trying and find out how standard
[quoted text clipped - 4 lines]
>
> The set I have are partially Lorch and some Crawford (CC).

Alan,

I'm that you've been through this already but where are you measuring the
12.5mm? Looking at the De Carle book on such things he lists Lorch collets
with a 12.5mm OD of the front face with an 8mm threaded portion. These would
normally be referred to as 8mm collets of which there should be a plentiful
supply. Just a thought.

Mark

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ticktock - 24 Jan 2006 08:43 GMT

Alan, I suspect that Mark is correct in his assumption.

I have various sized Lorch Lathes .. they are 6mm, 8mm and 10mm. 10mm
is the size for the bench, 8mm for the clock and watch, and 6mm is for
the watch Lathe.

I too suspect that you have standard 8mm collets and are just measuring
the wrong part of the 'part'.

What dimensions are the lathe that these collets fit?

IanB

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Alan Bain - 26 Jan 2006 22:56 GMT

>Alan, I suspect that Mark is correct in his assumption.
>
[quoted text clipped - 6 lines]
>
>What dimensions are the lathe that these collets fit?

It's a good idea, but they aren't 8mm collets; I've got a (very
incomplete) set of those for a smaller WW lathe. These are 12.5mm
diameter on the parallel part which goes inside the mandrel with a thread
on the end of about 11.5mm OD x 1mm pitch. I've never seen anything
like them before. CC code is 1580 (not that this helps me much).

Lathe is 4" centre height, 20" between centres. I suspect it is a
rather early specimen judging by the general style of construction
(round leather belt drive to headstock).

Alan

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David Harding - 31 Oct 2006 20:43 GMT

Alan, have just come across your post.

The lorch collets are pretty difficult to find and as you
state they are 12.5 mm across the plain portion with a length of about 97 mm.
I have spotted some occasionally on
ebay where I was lucky enough to obtain a reasonably complete set some years
ago. My Lorch is the plain toolmakers lathe, 100mm center height probably
dating from the 1920`s and has the outdated "backward" acting feedscrews on
the compound so needs to be used with caution.

Lorch designated this collet as their A1 spannzangen, a fact I only
discovered a little over a week ago during a visit to the Deutches museum
library where I was allowed access to some early Lorch catalogs they have.
You are probably aware of the excellent resource www.lathes.co.uk
which has quite a bit of information. My lathe is pictured on www.micprotech.
com.

good luck with your search

David Harding

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artificerjon - 26 Oct 2008 21:55 GMT

Alan, If you are still looking for some 12.5mm shank Lorch collets I have
just bought 15 of them in error when I wanted 10mm shank type. I am going to
sell the 15 I bought, let me know if your interested.

Jon' Lorton

>My Lorch-Schmidt lathe uses 12.5mm collets and I have a few missing
>from the set -- I'm tentatively trying and find out how standard
[quoted text clipped - 6 lines]
>
>Alan Bain

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Model Forum / General / Models / October 2008

12.5mm Collets