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Old 6th Dec 2017, 2:37 pm   #1
SurreyNick
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Default Cog for Ormond Slow Motion Dial

I am in need of a small cog for an Ormond Slow Motion Dial.

It is missing one of its original cogs and the replacement which is made of plastic (see pic) doesn't work properly. I don't have the tools to fabricate a replacement and it would be a shame to throw the dial away for the sake of a cog.

Does anyone have one in a box of loose parts?

I'm happy to pay.

Thanks

Nick.
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Old 6th Dec 2017, 5:56 pm   #2
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Default Re: Cog for Ormond Slow Motion Dial

Hi Nick, if all else fails I believe there are some clockmakers in your locality, they should be able to make one up pretty easily out of brass sheet.

Ed
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Old 6th Dec 2017, 8:56 pm   #3
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Default Re: Cog for Ormond Slow Motion Dial

Hi
You could try a tight fitting rubber gromet
Cheers Pete
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Old 6th Dec 2017, 10:41 pm   #4
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Default Re: Cog for Ormond Slow Motion Dial

Pete, soon grommets will be in demand !
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Old 6th Dec 2017, 11:18 pm   #5
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Default Re: Cog for Ormond Slow Motion Dial

Must get Wallace on board !
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Old 6th Dec 2017, 11:20 pm   #6
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Default Re: Cog for Ormond Slow Motion Dial

Boom! Boom!
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Old 7th Dec 2017, 11:36 am   #7
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Default Re: Cog for Ormond Slow Motion Dial

My experience of slow motion drives says that that's a simple grooved pulley rather than a "cog" with teeth.

Given an accurate drawing I could make one for you. The only tricky bit could be the cutting of the groove if it's very narrow.
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Old 7th Dec 2017, 2:22 pm   #8
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Default Re: Cog for Ormond Slow Motion Dial

That is very kind of you Graham and I would love to take you up on the offer.
You are quite right, it is a grooved pulley and not a cog and if it will help I can send you the remaining one to copy. I will of course pay you for your time, trouble and materials etc.
Thank you
Nick
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Old 7th Dec 2017, 2:34 pm   #9
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Default Re: Cog for Ormond Slow Motion Dial

I'll PM you.
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Old 8th Dec 2017, 3:11 pm   #10
60 oldjohn
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Default Re: Cog for Ormond Slow Motion Dial

Hi Graham, I have taken some photos of the wheel needed, might help, and the 1.5mm hole has a slight chamfer on one side only so it don't bind on the wire support. Yes there is an Ormond slo mo version that has teeth, this is the toothless version. I don't believe the measurements are critical to 0.01mm as shown as it is spring loaded.


John.
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Old 8th Dec 2017, 3:15 pm   #11
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Default Re: Cog for Ormond Slow Motion Dial

Thanks John.

Nick is sending me an original pulley as a pattern.

I can see that some tool grinding will be needed to cut the groove.
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Old 8th Dec 2017, 3:22 pm   #12
60 oldjohn
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Default Re: Cog for Ormond Slow Motion Dial

Quote:
Originally Posted by Station X View Post
Thanks John.



I can see that some tool grinding will be needed to cut the groove.


The last one I made I just used a junior hacksaw blade. Looking at my photo close up it appears to be flat in the bottom of groove. The wheels in my photos are originals.


John.
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Old 8th Dec 2017, 3:53 pm   #13
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Default Re: Cog for Ormond Slow Motion Dial

I think the groove needs to be vee shaped, as the big disc contacts the sides of the groove rather than the bottom to give increased contact pressure.

I'll grind a bit of power hacksaw blade, or possibly a 1/16" wide parting tool blade. My late father left me his lathe tool grinder where you can set a multitude of angles, but Ill do this by hand.
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Old 11th Dec 2017, 4:44 pm   #14
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Default Re: Cog for Ormond Slow Motion Dial

I received the pulley from Nick today. First thing I did was to thread it on a loop of wire so I don't lose it!

It has a parallel sided flat bottomed groove which will make things easier. I notice that there's a black sticky substance in the bottom of the groove. Is this the remains of an 'O' Ring or just accumulated grease and dirt?
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Old 11th Dec 2017, 7:17 pm   #15
60 oldjohn
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Default Re: Cog for Ormond Slow Motion Dial

My guess is years of dirt, all mine are clean. I did no cleaning before taking photo.

John.
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Old 12th Dec 2017, 9:24 pm   #16
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Default Re: Cog for Ormond Slow Motion Dial

It is old grease deposits. The dial innards had been smothered in the stuff, much of which was almost wax-like from age/impregnated dust etc. it would seem the degreasing solution didn't quite complete the task. Sorry I missed it Graham, the eyesight isn't quite what it used to be.
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Old 15th Dec 2017, 4:02 pm   #17
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Default Re: Cog for Ormond Slow Motion Dial

The original pulley and two new ones are now on their way to Nick.

Fiddly little things, but I managed not to lose any.
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Old 15th Dec 2017, 9:27 pm   #18
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Default Re: Cog for Ormond Slow Motion Dial

Nick, out of interest, is the dial part of a bigger project or just for restoration?
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Old 17th Dec 2017, 12:44 pm   #19
SurreyNick
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Default Re: Cog for Ormond Slow Motion Dial

A couple of years ago I picked up a partially complete cabinet belonging to an original 1927 Cossor Melody Maker and since then I have been collecting exact original components (those specified in the construction broadsheet) with the intention of re-constructing it. With a bit of luck it will one day re-surface complete and working

Are you after one? I ask because I do have a few other slow motion dials, including a lovely matching pair of Polar Slow Mos

Nick
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Old 18th Dec 2017, 12:05 pm   #20
SurreyNick
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Default Re: Cog for Ormond Slow Motion Dial

This morning, through the post, I received a set of expertly fabricated pulley wheels for my Ormond Dial. Reassembled the dial now works perfectly again.

Thank you Graham, you're a real Gent.

The spare wheel is in my store of little parts. If anyone ever needs it to repair a dial of theirs just ping me a message and it's yours.

Nick.
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