cilorentson wrote:

Where can I see a 'dog clutch'? thanks

My Smithy 1/3 in one machine has a dog clutch that engages the power
feed/threading.

Take apart a synchromesh transmission -- the synchro rings are cone
clutches on one end and dog clutches on the other.

Arf arf.

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Tim Wescott
Wescott Design Services
http://www.wescottdesign.com