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What size chuck key?

1/4" or 9/32"?

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Michael Wilde09/02/2011 22:42:26
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25 forum posts
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I've just received a Bernard 4 jaw chuck that I bought on ebay, minus a chuck key. Its the '34m' 6" model that has the words "made especially for the Myford Ml7 lathe."

I've used a piece of 1/4" square bar to remove the jaws and give it a good clean, polish and lube. The square bar was quite a sloppy fit in the square hole and, on measuring it, found it to be 0.280".

This works out at 9/32", is this the right size as it seems a bit of an 'odd-ball' size? or is the sloppy fit on the 1/4" bar right?

If anybody has this same chuck and wouldn't mind giving their chuck key a quick measure I'd greatly appreciate it!

I'm just trying to see if its worth buying one on ebay (1/4") or making an 'odd-ball' size. Also, what to make it from? I can get off-cuts of quite tuff stuff from work (we call it durehete, used a lot in the power generation industry).

Thanks in advance

Mike

Edited By Michael Wilde on 09/02/2011 23:00:20

David Clark 110/02/2011 08:02:57
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3357 forum posts
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10 articles
Hi There
Buy a 5/16 or 3/8 in. one from Ebay, Five minutes on the grinder and you have a 9/32 one.
regards David
 
 
Dave Tointon10/02/2011 10:13:26
49 forum posts
Michael,
I'd suggest you just turn one up!!! Must be one of the easiest turning jobs with a tee handle to suit. I made one out of mild steel and it has lasted years.
Regards
Dave Tointon
 
 
NJH10/02/2011 11:05:44
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2314 forum posts
139 photos
Hi Mike
 
I've just checked my Myford 6" PB 4 jaw. The socket measures 7.74mm and the key. which is a loose fit in the socket, is 7mm AF. Both chuck and key are in as new condition.
 
Regards
Norman
 
 
 
Gordon W10/02/2011 14:19:13
2011 forum posts
As mentioned before, a good source of square bar, in seemingly good quality, is old door locks, varies between 5/16" and 8mm, can beefiled to suit if needed.

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