Tim Hughes responded to the "Great O ring" question:
> Here are measured values:
> ID 0.168? (4.26mm) (~ nearest US list 3/16)
>
> OD 0.268? ( 6.81mm ) (~ nearest list 1/4 -9/32?)
> So C/S thickness: ~ 0.05? (1.27mm) (= nom 3/64?)
>
> So in metric series this would nominally be: C/S 1.27mm by 4.26mm
>
> Here are some good o-ring information sites :
> http://www.frederickseal.com/NewFiles/tips.html
> http://www.vedovell.com/metric1.html
>
> If anybody can identify a source other than Olympus for the O-ring, I would
> be interested to hear about it.
Tim, et al,
Since O-rings are fairly tough and more importantly elastic, has anyone
tried stretching a smaller O-ring on to the shaft in question? Since it
is being used in a application other than the one intended, maybe the
larger cross section of a -006 or 7 will shrink while being stretched
over the shaft thus the stretched condition may end up just what is
required.
As far as Metric O-rings go, good 'ole McMaster Carr doesn't even list a
cross section smaller than 1.5mm. In the 1.5mm cross section the
smallest ID is 5mm, a bit too large for our uses. IF... a 1.6mm cross
section could be used there are smaller ID available but again it would
have to be stretched to fit.
I look forward to a solution, as I have a (touch glass) working Winder 2
that will one day need help.
Mike Butler
Dublin, California
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