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lauriek Site Admin

Joined: 25 Nov 2007 Posts: 2404 Location: South East UK
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Posted: Sat Jun 25, 2011 10:03 am Post subject: Old Broken OM bellows wanted... |
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What I really need is one little screw - the one which holds the bellows to the front standard. Does anyone have one of these screws spare, or alternatively know the specifications of the screw? Cheers! _________________ Flickr | www.laurieknight.net | Blog |
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ChrisR Site Admin
Joined: 14 Mar 2009 Posts: 7619 Location: Near London, UK
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Posted: Sat Jun 25, 2011 12:34 pm Post subject: |
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Do you mean one of the 4 which go through a thin plate with a big hole in the middle?
You could invest in a whole box of watchmakers screws, something like
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=180627387606
The threads aren't actually critical. If they're tight they go in and stay in just fine! |
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rjlittlefield Site Admin

Joined: 01 Aug 2006 Posts: 18691 Location: Richland, Washington State, USA
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Posted: Sat Jun 25, 2011 2:05 pm Post subject: Re: Old Broken OM bellows wanted... |
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lauriek wrote: | or alternatively know the specifications of the screw? |
I just measured one. It's a small but standard metric thread: 2.50 mm outside diameter x 0.45 mm pitch.
--Rik |
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Mitch640
Joined: 15 Aug 2010 Posts: 2137
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Posted: Sat Jun 25, 2011 4:37 pm Post subject: |
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Rik, I'm interested in how you measured it? |
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rjlittlefield Site Admin

Joined: 01 Aug 2006 Posts: 18691 Location: Richland, Washington State, USA
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Posted: Sat Jun 25, 2011 5:33 pm Post subject: |
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Digital caliper. The thread pitch was a bit troublesome because my metric thread gauge only goes down to 0.5 mm. So I resorted to measuring 4.5 mm for 10 turns, viewing under a stereo dissecting scope at 10X or so. After that, some reassurance was provided by http://en.wikipedia.org/wiki/ISO_metric_screw_thread, which tells me that 2.5 mm diameter x 0.45 mm pitch is indeed a standard metric "coarse" thread.
--Rik |
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xys
Joined: 21 Apr 2011 Posts: 49
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