Olympus CH2 replacement focus gear

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Pitufo
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Joined: Sun Jun 21, 2015 4:32 am
Location: United Kingdom

Olympus CH2 replacement focus gear

Post by Pitufo »

Does anyone know if replacement focus gears are available for the CH2 anywhere? I think this is part number ZJ808700

I have had a look around but haven't come across anything yet.

Image
Image

carlh6902
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Location: Olathe, KS

Post by carlh6902 »

I think I have some ch2 parts. Let me look around. How many teeth are on the two diameters?

Carl

carlh6902
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Post by carlh6902 »

I do have a gear that I think is a match, but I need the tooth count to be sure.

Carl

Pitufo
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Post by Pitufo »

Sorry for the delay.

12 and 44 teeth.

carlh6902
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Post by carlh6902 »

The gear I have is 12 and 45. I will recount it to be sure.

Carl

carlh6902
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Post by carlh6902 »

I double checked the count, and it is 12 and 45. Here is the eBay item number:

183254141397

If you check the listing, one of the pictures has a red mark at 12:00, which is the 45 gear. There are smaller marks (counting clockwise) every 5 teeth.

Please double check your gear. If it looks to be a match, shoot me an offer of $15 for it, and I'll accept it. If it doesn't work for you, I do accept returns.

Carl

Pitufo
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Post by Pitufo »

Thanks Carl - I clearly can't count.

There are in fact 45 teeth. I've put an offer in on ebay as you suggested.

Kind regards,

John

Pitufo
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Location: United Kingdom

Post by Pitufo »

In future, if I wanted to get some of these made (i.e. to keep a fleet of CH2's on the road) - does anyone know the best method and approximate cost?

Is 3D printing up to this job? Or is it more a job for a traditional engineering company?

This particular part has to be very strong (there is a lot of pressure on it and these teeth seem to be the weak point, leading to a slipping focus and rendering the microscopes useless - otherwise they should last another 20+ years).

carlh6902
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Location: Olathe, KS

Post by carlh6902 »

I looked into making gears for the BH-2. The killer here is they are .45 module gears and nobody makes them. So, to get the ball rolling, they have to buy in a custom tool to cut .45 mod gears. This makes it expensive. I think the CH-2 uses the same module.

There is a seller on eBay, who also has his own site, that makes custom gears, including some for the BH-2. I can provide a link if you're interested.

Carl

carlh6902
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Location: Olathe, KS

Post by carlh6902 »

I gave the gear a quick acetone wash to remove the red ink and packaged it up. It goes to the USPS in the morning.

If you're interested, I can watch our for more of these.

Carl

Pitufo
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Post by Pitufo »

Thank you very much Carl

Yes, if you do come accross any others please let me know. Also if you have the link to the person who makes custom gears, that you be really helpful.

Cheers,

John

carlh6902
Posts: 89
Joined: Mon Feb 24, 2014 2:31 pm
Location: Olathe, KS

Post by carlh6902 »

Check out:
www.gearsmade.com

This guy sells BH-2 gears on eBay from time to time. I've never dealt with him, so keep that in mind.

I'll check with a few buddies to see if I can come up with anymore 12/45 gears. If so, I'll PM you.

Carl

Chris S.
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Post by Chris S. »

carlh6902 wrote:Check out:
www.gearsmade.com

. . . I've never dealt with him, so keep that in mind.
Even though you haven't dealt with him, Carl, this fellow seems like a potentially valuable resource for our community. Thanks for passing this along!

--Chris S.

carlh6902
Posts: 89
Joined: Mon Feb 24, 2014 2:31 pm
Location: Olathe, KS

Post by carlh6902 »

He's been selling bh2 gears on eBay for years now, and seems to have good feedback numbers. So I personally would not hesitate to buy from him. And yes, I'm glad he's available to supply these parts.

Carl

Pitufo
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Location: United Kingdom

Post by Pitufo »

Thanks Carl - the gear arrived today and works perfectly :)

Thank you also for the link.

Kind regards,

John

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