spur gears of the late 19th century ?? Halls lathe

[GT390Participant @gt390]

I am trying to identify a gear for a Halls lathe, its the one on the rear end of the spindle that drives the tumble reverse, going by info on Tony`s lathes.co.uk pages it appears the machine was made in Yarmouth c.1870 to 1890, although close to 12DP it is not seem to be. Were there gear standards back then ? or will this be an odd ball spec unique to this machine ?

Its got 16 teeth with an O.D. of 1.470"

PCD of about 1.297"

Root diameter of about 1.122

Any help or advise with gears of this era would be greatly appreciated

[GT390Participant @gt390]

[JasonBModerator @jasonb]

Have a look at this thread, yours too could be 1/4" Circular pitch

Edited By JasonB on 05/05/2017 13:35:34

[John Stevenson 1Participant @johnstevenson1]

Chances are it's a slightly undersize blank and it is 12DP.

PA is more than likely 14.5 given it's year.

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