Operating manual for a Harrison 140 metric lathe

[Philip MajorParticipant @philipmajor52482]

Containing how to cut an imperial thread

[Philip MajorParticipant @philipmajor52482]

Hi, I am trying to cut a 20 tpi Unf thread on my lathe, anyone got a manual for it , or advice on first principles to work it out, lathe has a 6 cm leads crew

Many thanks

[DC31kParticipant @dc31k]

Type 'Harrison 140 imperial threading' into Google.

Inter alia, it will find

https://www.mig-welding.co.uk/forum/threads/gear-cutter.56392/page-2

and

https://www.mig-welding.co.uk/forum/threads/advice-on-lathe-purchase.62989/page-3

These may shed light onto your problem.

Most unlikely to have a 6cm leadscrew unless it has come from a dressmaking shop or is ex-Blue Peter.

[Philip MajorParticipant @philipmajor52482]

Posted by DC31k on 12/11/2019 14:52:22:

Type 'Harrison 140 imperial threading' into Google.

Inter alia, it will find

https://www.mig-welding.co.uk/forum/threads/gear-cutter.56392/page-2

and

https://www.mig-welding.co.uk/forum/threads/advice-on-lathe-purchase.62989/page-3

These may shed light onto your problem.

Most unlikely to have a 6cm leadscrew unless it has come from a dressmaking shop or is ex-Blue Peter.

That will be 6mm then! As you say

[Philip MajorParticipant @philipmajor52482]

Thanks for this . Answer found on Google as per above post. 3 nice pictures of the settings

[norm nortonParticipant @normnorton75434]

These imperial tables for a 140 were all on the Harrison Yahoo forum site, I am sure I put some there, but it is all shut down now by the recent Yahoo policy. There is a new Harrison site and I will have to see if the files of reference data have been transferred across.

I will post my simple .jpg of information here in the hope that it is readable. If not message me with your email and I will copy it to you.

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