You Need Hands........

[ftwizard]

 

Or rather, I need hands. I somehow managed to lose the minute hand from a Rotary wristwatch and need to order another.
Question is, what size do I order. I can measure the pinion, but clearly I need something a little smaller to allow the friction fit, but how much smaller, or is that allowed for in the stated bore measurement. I'm looking at the cousins site.

[rogart63]

best would be to find out which movement it is? And search for it on Ranfft movements?  But if you measure it with a good caliper you could come close enough. There is no need for a super tight fit. Minute is maybe 0,70 mm and the pinion is 0,70 and the minute hand has a inside dia of 0,68. Measure the pinion and that would be the size. 

[ftwizard]

It's an AS 1900/01. I've looked at the Ranfitt site, and I can't see where it states the info I need.

 

[Marc]

According to ranfft you need 0.9mm for the minute hand. The hour hand is 1.5mm and the seconds hand is 0.21mm.

[ftwizard]

Right, I see that now, thanks. 

So, I just order by pinion size, and the hands are slightly undersized to fit.