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I just up-graded my older G-11 to the tucked motor design w spring loaded worms. During setup a problem and a question came up
1. I stripped the head out of one of my cap screws shown below, Red arrow. Could anyone tell me what the specs are for this screw, Home Depot doesn't carry it's like.
2. In the image of the servo motor is installed with a 180 degree rotation from the pictures on the Losmandy web site, note the position of the plug in for the DEC cord from Gemini. Is there a known problem with this orientation?



Would appreciate any help.
Thanks Tim

1. I stripped the head out of one of my cap screws shown below, Red arrow. Could anyone tell me what the specs are for this screw, Home Depot doesn't carry it's like.

10-32 x 1/2 socket head cap screw. Most Ace Hardware stores will have these. NB: It should never be necessary to tighten those screws to the point where you round them out. If you don't have a good 5/32" hex key, they carry those at Ace as well.

2. In the image of the servo motor is installed with a 180 degree rotation from the pictures on the Losmandy web site, note the position of the plug in for the DEC cord from Gemini. Is there a known problem with this orientation?

? I don't think the picture on the website is correct, as there would be no way to route the cable past the worm mounting screw. My mount doesn't have the SLW upgrade, however the motor is mounted exactly as shown in your photo. There is no issue having the connector in that orientation.

Tim.
The red arrow screw is Motor to Gearbox screw. It is #4-40UNC x 5/8" Stainless steel Socket Cap screw. Do not over tighten it can strip the GB plastic thread. This topic comes up often, last time Jun 12 on Gemini.IO group. That's why the database was done (years back), see below.. Anyone can do an entry or ask someone to update more entries (I just fixed a few entries on 13 Jun 24), if they see an error ....tell mods or someone to fix. Its there to be used by all.

There is a list of screws etc over at: Gemini Users.IO group/ Database/Parts Screws Aftermarket, here (if the link works).

I think M.Collins identified the "green arrow screw", not the "red arrow screw". As far as I know its fine to orientate the motor this way.

Cheers
Brendan




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Brendan

Paul,David. Are common screws and threads etc a good Gemini FAQs topic?

Yes I know Losmandy sells these but not all members are close to Losmandy, let alone USA!

We can include reference to the losmandy web shop!. I just did some topic searches same topic on this screw alone has multiple threads (pardon the pin) in last 4 years in a few IO forums, alone

FWIW
Cheers
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Brendan

On Fri, Jul 12, 2024 at 02:28 PM, <tshelley@...> wrote:

I just up-graded my older G-11 to the tucked motor design w spring loaded worms. During setup a problem and a question came up
1. I stripped the head out of one of my cap screws shown below, Red arrow. Could anyone tell me what the specs are for this screw, Home Depot doesn't carry it's like.
2. In the image of the servo motor is installed with a 180 degree rotation from the pictures on the Losmandy web site, note the position of the plug in for the DEC cord from Gemini. Is there a known problem with this orientation?

The 4-40 size is what has worked for me. Just beware that you are tightening this screw into plastic threads. Just a snug with the proper sized (3/32") Allen key will do enough to keep the motor seated well. Often a ball head end works better because the access is on a bit of an angle, not straight in. But if you overtighten, you'll strip out the plastic threads with the metal screw, and only replacing the whole gearbox will fix that.

Good luck,

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

Thanks to everyone, for your quick responses. This information should do it.

Don’t want to “dis” anyone but as John said don’t over tighten. Also ball headed hex have a tendency to snap the balls off in the head. I know I’ve done it on a Moonlite in a hidden deep hex grub screw.

Took over a week to finally get it out. Never again. But yes I hear ya John on access to these hex heads. It’s pain.

cheers FWIW
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Brendan