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Colchester Bantam lathe lead screw

Colchester Bantam lathe

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Pence25/06/2019 18:49:27
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A while back, I bought a Colchester Bantam metric lathe - the chap had changed the lead screw and lower sadle in order to have the thread dial lacking on the metric lathe.

He assured me that the lead screw was identical on the metric and imperial versions of the lathe, I was skeptical but thinking about it why would Colchester make two different threads at extra cost and surely he would have checked by measuring them first.

Now looking in the manual I see the Eagle and Condor have 4tpi and 6mm threads respectively.

I was wondering if somebody could be kind enough to measure the thread on the Eagle and presumably somebody else (unless you have both) the Condor to clear this up?

I dread the answer that they are in fact different (head ache tablets on the ready...

old mart25/06/2019 19:28:45
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Why don't you measure the length of 10 pitches of the thread? Then it will be obvious what leadscrew you have.

Pence25/06/2019 19:44:13
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Posted by old mart on 25/06/2019 19:28:45:

Why don't you measure the length of 10 pitches of the thread? Then it will be obvious what leadscrew you have.

its in storage at the moment but if both Eagle and Condor have 4tpi I still would not know I might wrongly assume its incorrect expecting mine should be 6mm. I'll try to measure it as soon as I can get to the lathe anyway.

Edited By Pence on 25/06/2019 19:44:57

Keith Rogers 226/06/2019 10:37:33
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Pence.

My imperial Bantam leadscrew is 4tpi.

Keith.

Pence26/06/2019 11:37:10
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Posted by Keith Rogers 2 on 26/06/2019 10:37:33:

Pence.

My imperial Bantam leadscrew is 4tpi.

Keith.

 

okay thanks that's very useful. Now all I need is somebody with a metric bantam to measure the leadscrew to see if its 4tpi too or disaster 6mm!

Edited By Pence on 26/06/2019 11:37:58

old mart27/06/2019 21:57:57
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I would expect a metric lathe to have a metric leadscrew. The guy I bought my 7 x 12 Chinese lathe from bought it from Warco and took it home in his car. He had pre-ordered a metric version, but by an oversight, Warco only had an imperial one. They gave him a metric leadscrew and nut. I have them, still greased and wrapped up.

John Haine27/06/2019 22:44:13
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Posted by old mart on 27/06/2019 21:57:57:

I would expect a metric lathe to have a metric leadscrew...

You obviously don't have a Myford!

Hopper28/06/2019 04:49:22
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Posted by John Haine on 27/06/2019 22:44:13:
Posted by old mart on 27/06/2019 21:57:57:

I would expect a metric lathe to have a metric leadscrew...

You obviously don't have a Myford!

Or inversely, some Chinese-made imperial lathes.

Pence28/06/2019 09:46:08
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the thing is if he did measure them for 6mm pitch there would be 4 in 24mm as oppose to 4 in 25.4mm a noticeable difference surely nobody could make such a mistake?

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