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Hi group,

Recently I received a Gemini 2 retrofit kit for my HGM200 mount.

On examining the contents I find that I am missing two crucial spur

gears, one for the RA gearbox and one for the Dec. gearbox.

I am waiting to hear back from Losmandy in regards to this, but in

the meantime I was wondering how other Titan mount owners or

HGM owners fared. Were those spur gears included in your kit, and

if not, is it the norm to remove the spur gear from the Gemini 1 gearbox

and install it onto the gearbox of the Gemini 2.

I don't really want to start pulling the Gemini 1 apart as it's been a stellar

performer, and still is ( parden the pun ).?

I couldn't see these spur gears listed on the Losmandy Accessories page

either.

Any thoughts please.

Thanking you

George.?

I spoke to George about this that Losmandy would have some but did say if the gears pitch, TPI, PA and material can be identified by an another owner ….that maybe he can get one from these . ??

Cnc motion control store ebay

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Who are a great place for gears. ?But he needs to know info on the gear, hub diameter etc?

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anyone??

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cheers

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Brendan

Hi George,

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As far as I know, Losmandy uses the same spur gear in all their mounts, with the Titan having 3 and the G11 and others having two. They don't list every single part on their website, and this is one of those. To get that one, you need to fill out the special replacement form so Tanya can go into the shop and ask Mr. Losmandy to pull one off the shelf. This can take a number of weeks and then the time shipping to you in AU. I looked for a replacement several years ago and I think the one in the attached pdf was close enough, with 1.5 inch PD. If you can find a local supplier, you need to make sure the pitch angle is the same as Losmandy's which is 20 PA, if I am remembering right. But if you don't have the same PA, you can have the same hub, shaft hole, gear diameter and teeth count, but the wrong PA will not mesh correctly with the Losmandy original. Another option may be to order all new gears from your local supplier to make sure they are all the same PA. But be careful when removing these gears as the set screw is easily stripped and rounded out inside unless you have the correct 1/20 inch. precision hex tool, not just a random Allen wrench. Once the hex socket is stripped your only option is to drill out the screw which rarely works.

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Good luck,

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John

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Losmandy G11G2 on pier; refurbed Losmandy G11 with OnStep controller; SkyShed design roll-off observatory; ZWO ASI2600MM-P; ZWO ASI071MC; Sky-Watcher Esprit 100 ED with field flattener; Celestron C925 Edge HD with 0.7XFR, William Optics Zenithstar 61 APO; PHD2, Sequence Generator Pro and PixInsight user

Hi John,

Thanks for the detailed reply.

Tanya doesn't know much about these particular spur gears, and

Scott is currently on holidays for another two weeks.

It gives me hope that they may have the parts, even though they

are not listed?on the?spares web site.

The dealer who I went through for this is on the case, and

will report back to me when Scott returns.

I know that the specs. for the gears need to be spot on, so I'll just

wait and see what Scott comes up with, as he may be able to supply

me with the specifications that I need...fingers crossed.

Thanks to all who chimed in on this, especially Brendan in the good

old land of Oz.

Cheers and all the best to all.

George?

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