[SEL] Tap & Die Set Help Needed--OT

[jerry]

During my working years I worked on the construction of many power 
substations which were mostly assembled using bolts however some portions 
were threaded ie insulator mounts occasionally we would have to fabricate 
some portion if it were to be threaded it was necessary to use oversize taps 
to accommodate the use of galvanized bolts to prevent rust  the tapped hole 
would be sprayed with a cold galvanize spray this is my first response to 
the list hope it works Jerry washington state----- Original Message ----- 
From: "Dave Rotigel" <rotigel at alltel.net>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Sunday, March 12, 2006 6:44 PM
Subject: Re: [SEL] Tap & Die Set Help Needed--OT


> At 05:53 PM 3/12/2006, you wrote:
>>Undersize or oversize taps will be marked with the nominal size and pitch, 
>>followed by the amount the minimum pitch diameter is over or under basic. 
>>For example, 1/2-13+.010".
>>More here >
>>http://www.unionbutterfield.com/tech/taps/Limits.asp
>
> Hi derek,
>         Thanks for that information. It was interesting! BUT what in the 
> hell was the purpose of over/undersized taps and dies?
>                 Dave
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