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How to size up a quick change tool post

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dawesy:
I'd like to get a quick change tool post for my Churchill lathe but as its a rare one I need to know what measurements I need to get the right qctp.
Has anyone got any tips?
The current one is about 3" square with a 22mm or so groove round for the tool bits.
Any help gratefully received.

awemawson:
Well stating the obvious it needs to be able to present the tool tip on centre height and be able to accept the size of tools that you use. I suggest that a good starting point is to measure from the top of the top slide (ie where the tool post mounts) to centre height. Then select a post that puts its tool tip such that the height adjustment straddles centre height.

chipenter:
As yours is a 6" lathe go for Harrison / Colchester size , you could reduce the height if necessary , the chinees push piston type are the easiest to make holders for , but Dicenson Bison are the best but you do need deep pockets .

Joules:
If you got a Myford style Dickson toolpost cheap, you can always add packing below it to raise the centre height if needed.  As stated, what size tools do you generally use ? Do you use the full 22mm or smaller.

Pete W.:
If you go here:

http://www.mscdirect.co.uk/CGI/INPDFF?PMCTLG=00&PMPAGE=675&PMITEM=TQC-79020M

There's a useful table of dimensions for the standard sizes of Dickson style Quick Change tool-posts.  You might have to wait a few seconds for the page to open!

Usual disclaimer - no connection other than as an occasional satisfied customer. 

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