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[OM] Re: OM-4 speed ring help needed

Subject: [OM] Re: OM-4 speed ring help needed
From: John Hermanson <omtech1@xxxxxxxxxxx>
Date: Thu, 05 Oct 2006 10:44:17 -0400
As noted.  New shutter speed dial from Olympus will run about $40 + 
shipping.

___________________________________
John Hermanson
Camtech Photo Services, Inc.
21 South Lane, Huntington NY 11743
631-424-2121 | Olympus OM Service since 1977
http://www.zuiko.com  |  omtech1 AT verizon.net


Mark Dapoz wrote:
> On Wed, 4 Oct 2006, S Revlis wrote:
> 
> 
>>Thanks for the tips guys. I did think that the detent notches looked worn.
>>You've got me wondering why that would made the ring harder to move, I
>>would have thought being rounded off would make it move more easily or
>>perhaps even slip out of position.
> 
> 
> As the ring detents wear the ball goes further up into the ring and you need
> more force to get it to go back into its hole.
> 
> 
>>Where is the friction comming from anyway? Is it from the small ball
>>bearing that goes into the notches or from the teeth in the gears, or
>>the pressure from the plate on top or where? Should I get some lube on
>>the offeding bit.
> 
> 
> The force is mostly from the spring under the ball.  It pushes the ring up
> and that causes the ring to ride against the frame.  If your ring is out
> of round then that could also be causing additional friction.  Try putting
> the ring in without the ball and spring.  It should rotate very easily.
> For grease I use a small amount of moly lube on the contact points.
> 
> 
>> Where can one buy a new dia?
> 
> 
> I'm sure Olympus still has some in stock.  Last time I bought one (a few
> years ago) they weren't too expensive.  You could also try picking up a
> parts body off eBay, they usually sell at a reasonable price and you get
> a lot of other spare parts as well :-)
>                                       -mark
> 
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