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Re: Gas Sealing [message #1135 is a reply to message #1133] Mon, 24 September 2007 03:52 Go to previous messageGo to previous message
Messages: 23
Registered: September 2007
Location: University of Rostock / D...
... indeed here is a decision to take:

The trapezoidal groove provides absolute protection against the O-ring falling out. The price for this is more complex machining and decreased accessability (important for cleaning) of the O-ring.

The rectangular groove designed to the standards gives 50% "fall out prabability" if turned over by 180 and is likely to hold on sufficiently for the expected mounting procedures, when chosen a bit smaller or larger (2% maybe) in diameter than the groove.

The question now is, wether the trapezoidal groove could be machined with sufficient precision - especially regarding the surface. This is even more important for the trapezoidal groove than for the rectangular one because the concept of "four point contact" can not be applied in a sensible way here.
So the question is first of all a practical one for the manufacturer of the endplate (--> tools?).

The manufacturer comments on this: "[...]This groove shape is very uncommon and laborious to machine. It should only be applied, when it is absolutely needed[...]" So we should ask ourselves - do we really need it?
In case of ALEPH there where parts with complex geometries and probably handling was also more difficult, there a trapezoidal groove surely was a simplification for the assembly.
In our case handling will (hopefully) be much easier and controlled, so that we can (imho) lack the comfort of a trapezoidal groove for the assembly.

Cheers, Oliver.
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