[LargeFormat] How to measure thread sizes?

[Ken Hough]

Get a thread guage from your local ACE hardware. Then a copy of the 
Machinist Handbook is handy. A lathe is handy too. American made 
shutters are measured in inches. So a dial caliper is needed. Make that an 
Electronic one since European and Copals are in metric and most Electronis 
calipers are English / Metric. Get a metric thread guage too!
Measure the OD of the threads and use the thread guage to determine the 
thread per inch / mm
Ken

From:           	"Marco Milazzo" <mmilazz1@elp.rr.com>
To:             	<largeformat@f32.net>
Subject:        	[LargeFormat] How to measure thread sizes?
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Date sent:      	Mon, 19 Aug 2002 14:16:17 -0600

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Ye gurus,

I've acquired a few lenses and lens boards, and now I'm trying to join them.
Seems like I never have the right flange or the right retaining ring, or the
hole in the board to too big or small.  So. . .

How do you measure these things? What tools are needed?   Using a ruler
doesn't seem that accurate, and I'd like to be able to say, "I need a 409mm
flange," not "It's about 4.5 inches." (Not saying those are equivalent -- I
just invented them).

How to measure the diameter of rings, flanges and other holes?   Same
issue -- I want an exact measurement, not "About 3 7/8."

How about threads per inch -- is that an issue?

By the way, if anyone has extra flanges or retaining rings they want to get
rid of (i.e. sell), email me.  I'm looking for a bunch.

Thanks in advance,

Marco
El Paso, Texas (104 degrees last Thursday)


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        ******Ken Hough Photographic Repair******
         Specializing in Deardorff Refinishing
          Lens Recementing and Shutter repair
          Contributor to McKeowns Price Guide
                   Deardorff Section
           Custom machined Photographic items
           Text Contents Copyright 1999 KHPR
          http://deardorffcameras.0catch.com/
                   Est. 1980