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Tolerance

thread1616-57285

Tolerance

Tolerance

(OP)
Here is the hypothetical. We must drill a hole to mount a feed-thru terminal with a body diamter of .145 +/-.010. The feed-thru must be soldered in with a gap around the body of approximately .005 to ensure good capillary action to flow the solder. Taking into account tolerances, what size hole should be called out on the housing?

RE: Tolerance

Hi Billtati

Does the feedthru manufacture spec the proper hole to drill.  Most electrical components give you the required hole and mounting foot prints.

Having said this I would drill a 5/32" or .156.  This gives you the required .005 gap nominal, and in a worst case the feedthru still fits.

Tofflemire

RE: Tolerance

(OP)
Unfortunately the manufacturer (Tusonix) does not give a recommended mounting hole. Your answer makes sense but I think you understand my concern. If the feed-thru comes in on the high end (.155) and the hole in the housing is 5/32 (.156) the solder MAY not flow correctly. Thanks for the second opinion. I believe it is what I will do.

RE: Tolerance

billtati-

You know there are mfgrs who make solder preform rings.  All you have to do is slide them over the solder terminal and heat them with a heat gun.  I believe RAYCHEM (now part of TYCO) is one mfgr.

Tunalover

RE: Tolerance

(OP)
Yes. We are using preform rings. However, thanks for the heads-up!

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