Sorry. I'm too used to yankee specs.
-----Original Message-----
From: Josh Putnam [mailto:josh@xxxxxxxxx]
Sent: Tuesday, September 03, 2002 11:17 AM
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] cross point screws follow up; JIS cross-point screws
Mark Dapoz writes:
>On Tue, 3 Sep 2002, Timpe, Jim wrote:
>> I think part of your descriptor is lacking. A 1.7x4 is 1.7mm x 4 threads
>> per mm, if I'm not mistaken. The depth of the screw is nowhere
enumerated
>> in a standard thread sizing.
>Perhaps Olympus is using a different notation then. The bottom plate uses
>two screws, a 2x4 and 2x3. The 2x4 is longer than the 2x3 but the thread
>pitch is the same. That wouldn't be the case using the interpretation
above.
Metric thread notation is different from US thread notation.
This same issue comes up a lot on bicycles. In the descriptions
above, M1.7 specifies both the diameter and the pitch of the
threads, while 4 is indeed the length of the screw. I don't know
what the pitch is for M1.7 screws, but it's part of the spec.
Likewise, on a bicycle, an M5x12 screw and an M5x20 screw have
the same pitch, just different lengths.
--
josh@xxxxxxxxx is Joshua Putnam
Putnam Financial Services
Voice: 206/992-2296
Fax: 425/793-3623
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