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Hi Brian and all, I finally took some clear photos of my RA and DEC motors for my Gemini 1 on my MI-250. My goal is to swap these out for new Losmandy motors, so any help in whether the new ones would fit or not would be appreciated! Clear Skies, Paul
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Hi Paul, I have two brand new Losmandy motors for sale (latest generation) if it’s good for you. ?Need to be use with Gemini2. Mario
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Hi Brian and all, I finally took some clear photos of my RA and DEC motors for my Gemini 1 on my MI-250. My goal is to swap these out for new Losmandy motors, so any help in whether the new ones would fit or not would be appreciated! Clear Skies, Paul
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<MI-250 DEC bolt pattern.jpg><MI-250 DEC motor angle.jpg><MI-250 RA Bolt pattern.jpg><MI-250 RA motor angle.jpg>
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Hi Mario,
I like new!
But I need to find out if I can use them without machining with my MI-250 gearboxes first.
Paul
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Hi guys,
Those original Gemini-1 motors in your photos have the early version rectangular motor cable.
There is likely nothing wrong with those motors, or the Gemini version that drives those motors.? I fix those Geminis.? But I cannot fix the motors.??
But those new motors in the later photos have the more modern round DIN cable connectors.?? So those new motors will not, in general, work unless a suitable conversion cord is made up.?
?(I recently tried to make up a conversion cord from a CAT5 internet cable to my round DIN motor type.? The connections were correct in a DC sense, but the new motors vibrated a lot and the Gemini motor chips were getting hot.? So there is more to the conversion cable puzzle than I first thought.? Does someone in this group know what magic is needed to get a new motor to work properly in an old Gemini with rectangular motor connector?)
The old motors you show are still bolted to their stock gearbox. And you still show the end of the Oldham coupler attached.??
So I'll ask:
?Is it really a new gearbox you are seeking, not the motor?? A new gearbox is only about $35.??
The motor and gearbox pinion gear is the same, so any stock Losmandy gearbox should work with any Losmandy motor of any version.? So a Gemini-2 (only came with round DIN motor cable connectors) can replace a Gemini-1 with the same motor connectors.??
(Incidentally, the newer "hi torque" motors are stronger than the earlier DC motors.? But you can increase the motor torque anyway by increasing the DC supply voltage toward 18V.? The torque of the DC motor is directly proportional to the DC voltage supply.? )
Best of luck!
Michael
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Hi Mario,
I like new!
But I need to find out if I can use them without machining with my MI-250 gearboxes first.
Paul
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Hi Micheal,
Ive hit the jackpot tonight with all the info! Thank you for letting me know if the gearbox and motor will fit in my MI-250. It looks like the Oldman coupler is the only question mark at this point. I assume I can place it on the new motors. I went to our neighbors house, and explained to him the problem with the diode you helped me with earlier, I asked him if he had an opinion, and he said he would go ahead and get a whole new retrofit kit. As my finances have become better since last week, I will be buying a Gemini 2 retrofit kick, instead of repairing the Gemini 1. Thank you for your offer of service, however! Losmandy will be in possession of my RJ 45 motors in a few weeks.
Clear Skies,
Paul
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Good for you to upgrade your system.
Some notes:
The Oldham coupler has 3 parts: the two metal ends and a plastic center part.? You want to keep that entire coupler as the new system you will need new motors and cables and Gemini, but won't have the coupler.? (If you are trading in your G-1 for a reduced price on a G-2).? You definitely need the new cables and motors for the G-2.)
The coupler metal ends...one fits the gearbox drive output shaft that's 3/16 inch diameter, the other end fits the worm's 1/4 inch shaft.??
The gearboxes you can re-use, but its probably a good idea for you to order 2 new ones.? The new gearboxes have screws to allow you to open the gearbox to clean it or re-lube it. Over a long time the plastic rear panel can crack from the weight of the motor.? It's always good to have a spare gearbox in case of trouble.? Your existing gearboxes are probably quite old.?
Have fun, Michael
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I am seeking a rectangukar type motor, just to use for testing my repairs if those older G-1 units.??
Hi Micheal,
Ive hit the jackpot tonight with all the info! Thank you for letting me know if the gearbox and motor will fit in my MI-250. It looks like the Oldman coupler is the only question mark at this point. I assume I can place it on the new motors. I went to our neighbors house, and explained to him the problem with the diode you helped me with earlier, I asked him if he had an opinion, and he said he would go ahead and get a whole new retrofit kit. As my finances have become better since last week, I will be buying a Gemini 2 retrofit kick, instead of repairing the Gemini 1. Thank you for your offer of service, however! Losmandy will be in possession of my RJ 45 motors in a few weeks.
Clear Skies,
Paul
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I note that with a pair of replacement gearboxes, we had to put a couple of spacer washers when mounting the gearbox on the MI-250 – the shaft was fractionally too long for the Oldham coupler – not sure if it will apply for you, but just one thing to be aware of. ? Graeme ?
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From: [email protected] <[email protected]> On Behalf Of Michael Herman
Sent: 07 February 2022 02:35
To: [email protected]
Subject: Re: [Gemini_users_io] RA and DEC motors? Good for you to upgrade your system. Some notes: The Oldham coupler has 3 parts: the two metal ends and a plastic center part.? You want to keep that entire coupler as the new system you will need new motors and cables and Gemini, but won't have the coupler.? (If you are trading in your G-1 for a reduced price on a G-2).? You definitely need the new cables and motors for the G-2.) The coupler metal ends...one fits the gearbox drive output shaft that's 3/16 inch diameter, the other end fits the worm's 1/4 inch shaft.?? The gearboxes you can re-use, but its probably a good idea for you to order 2 new ones.? The new gearboxes have screws to allow you to open the gearbox to clean it or re-lube it. Over a long time the plastic rear panel can crack from the weight of the motor.? It's always good to have a spare gearbox in case of trouble.? Your existing gearboxes are probably quite old.? ? I am seeking a rectangukar type motor, just to use for testing my repairs if those older G-1 units.?? ? Hi Micheal,
Ive hit the jackpot tonight with all the info! Thank you for letting me know if the gearbox and motor will fit in my MI-250. It looks like the Oldman coupler is the only question mark at this point. I assume I can place it on the new motors. I went to our neighbors house, and explained to him the problem with the diode you helped me with earlier, I asked him if he had an opinion, and he said he would go ahead and get a whole new retrofit kit. As my finances have become better since last week, I will be buying a Gemini 2 retrofit kick, instead of repairing the Gemini 1. Thank you for your offer of service, however! Losmandy will be in possession of my RJ 45 motors in a few weeks.
Clear Skies,
Paul
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Yes, the Mi-250 gearbox has a small amount removed from the output shaft length - sorry but I forget how much you need to remove off the top of my head.
Mark
I note that with a pair of replacement gearboxes, we had to put a couple of spacer washers when mounting the gearbox on the MI-250 – the shaft was fractionally too long for the Oldham coupler – not sure if it will apply for you, but just one thing to be aware of. ? Graeme ? ? Good for you to upgrade your system. Some notes: The Oldham coupler has 3 parts: the two metal ends and a plastic center part.? You want to keep that entire coupler as the new system you will need new motors and cables and Gemini, but won't have the coupler.? (If you are trading in your G-1 for a reduced price on a G-2).? You definitely need the new cables and motors for the G-2.) The coupler metal ends...one fits the gearbox drive output shaft that's 3/16 inch diameter, the other end fits the worm's 1/4 inch shaft.?? The gearboxes you can re-use, but its probably a good idea for you to order 2 new ones.? The new gearboxes have screws to allow you to open the gearbox to clean it or re-lube it. Over a long time the plastic rear panel can crack from the weight of the motor.? It's always good to have a spare gearbox in case of trouble.? Your existing gearboxes are probably quite old.? ? I am seeking a rectangukar type motor, just to use for testing my repairs if those older G-1 units.?? ? Hi Micheal,
Ive hit the jackpot tonight with all the info! Thank you for letting me know if the gearbox and motor will fit in my MI-250. It looks like the Oldman coupler is the only question mark at this point. I assume I can place it on the new motors. I went to our neighbors house, and explained to him the problem with the diode you helped me with earlier, I asked him if he had an opinion, and he said he would go ahead and get a whole new retrofit kit. As my finances have become better since last week, I will be buying a Gemini 2 retrofit kick, instead of repairing the Gemini 1. Thank you for your offer of service, however! Losmandy will be in possession of my RJ 45 motors in a few weeks.
Clear Skies,
Paul
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> I forget how much you need to remove off the top of my head. ? Don’t worry I’ll get the trepanning saw and we’ll get to work! ? D.
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If you find anything,?let me know!
> I forget how much you need to remove off the top of my head. ? Don’t worry I’ll get the trepanning saw and we’ll get to work! ? D.
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Michael Herman
David C. Partridge