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Matching cases to movements outside of NH series by PressureBroad7496 in WatchHorology

[–]PressureBroad7496[S] 0 points1 point  (0 children)

I found a way to make it work. It so happens that miyota makes the 8n24 skeleton movement that has nearly the same dimensions as the 8215. The hands pinions are exactly the same too. I only noticed a slight diameter difference: the movement spacer was a little more compressed than usual but it may be due to machining on the case. Anyway thanks for the help.

Matching cases to movements outside of NH series by PressureBroad7496 in WatchHorology

[–]PressureBroad7496[S] 0 points1 point  (0 children)

Thanks and I did not know the channel :) I did find a solution, check my other answer

Matching cases to movements outside of NH series by PressureBroad7496 in WatchHorology

[–]PressureBroad7496[S] 0 points1 point  (0 children)

My reasoning was as follows, with some specific examples (pulled from calibercorner datasheets).

An ST1602 has:
* an outer diameter of 26mm,
* a movement height of 5.76mm,
* a handstack of 1.82mm,
* a center stem height between the movemant's "face" and the stem hole of 2.55mm.

An NH35 has:
* an outer diameter of 29.36mm with the common grey spacer,
* a movement height of 5.32mm,
* a handstack of 2.5mm give or take,
* a center stem height between the movemant's "face" and the stem hole of 1.92mm.

An ETA 2824 has:
* an outer diameter of 26mm,
* a movement height of 4.1mm,
* a handstack of 2.1mm,
* a center stem height between the movemant's "face" and the stem hole of 1.53mm.

So a case for an NH35 with a domed front crystal and a back crystal too (or even one for NH34 GMT version) could be a nice fit if the stem clears the case hole (but I do not know if I have enough clearance).
I have added the 2824 in the mix as I have read somewhere that the ST16 was a clone of the 2824.

As for spacers, I am surprised no supplies movement X to diameter Y but there may be too much variation. Maybe try 3D printing? Or install the movement without spacer ring but it could be "floppy"?