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Old Broken OM bellows wanted...

 
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lauriek
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Joined: 25 Nov 2007
Posts: 2404
Location: South East UK

PostPosted: Sat Jun 25, 2011 10:03 am    Post subject: Old Broken OM bellows wanted... Reply with quote

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!
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ChrisR
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Joined: 14 Mar 2009
Posts: 7359
Location: Near London, UK

PostPosted: Sat Jun 25, 2011 12:34 pm    Post subject: Reply with quote

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
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Joined: 01 Aug 2006
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Location: Richland, Washington State, USA

PostPosted: Sat Jun 25, 2011 2:05 pm    Post subject: Re: Old Broken OM bellows wanted... Reply with quote

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

PostPosted: Sat Jun 25, 2011 4:37 pm    Post subject: Reply with quote

Rik, I'm interested in how you measured it?
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 18362
Location: Richland, Washington State, USA

PostPosted: Sat Jun 25, 2011 5:33 pm    Post subject: Reply with quote

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

PostPosted: Sun Jun 26, 2011 6:19 pm    Post subject: Reply with quote

Also, Small Parts might be a good source, e.g. this is a pack of 100 16-mm long steel screws, M2.5-0.45 for about $5:

http://www.smallparts.com/dp/B000NHSAIO/ref=sp_dp_g2c_asin

(they have also other materials, e.g., nylon, etc.)

Rashid
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