Square Centres?

Square Centres?

This topic has 6 replies, 5 voices, and was last updated 20 December 2011 at 22:12 by Alan Worland 1.

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18 December 2011 at 21:10 #80039
Alan Worland 1
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@alanworland1
Having a look for something today I came across some No1 dead centres which had been ground (accurately) into a now square point. The smallest of them has had the end reduced to about a quarter of an inch dia with the square ground on the tip.

What would they be used for? I have no idea!

Alan
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18 December 2011 at 21:10 #5802
Alan Worland 1
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@alanworland1
18 December 2011 at 21:31 #80043
Engine Builder
Participant
@enginebuilder
Could have been to turn a particular part that had a square recess at one end, between centres.

David
18 December 2011 at 22:40 #80054
MICHAEL WILLIAMS
Participant
@michaelwilliams41215
Hello again ,

This is a cutting centre . You will find references to them in old books on turning . In olden times the recommended method for making centres in the end of a bar for turning was to mark out and drill the ends with a small hole by hand . The work was then mounted in the lathe between one plain and one cutting centre whereon the cutting centre turned the original plain hole into a nice neat conical centre hole . Reverse ends to make another one and then swap cutting centre for an ordinary one and proceed with turning .

MW .
19 December 2011 at 17:24 #80114
Les Jones 1
Participant
@lesjones1
I have had this one for years and wondered what it was used for.

Les.
20 December 2011 at 19:08 #80184
Sub Mandrel
Participant
@submandrel
I’ve got one. It isn’t great but useful for centering something that won’t fit in a chuck easily.

Neil
20 December 2011 at 22:12 #80197
Alan Worland 1
Participant
@alanworland1
Thanks for identifying these for me!

I (like you Les!) have had them for years and not had a clue what they were for but thought they might come in handy one day!

Alan
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