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Restoring a Fullerscopes MK-IV mount

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#1 xavier

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Posted 28 November 2012 - 03:29 PM

Hello
From a local observatory I picked up a heavy Fullerscopes MK-IV mount.

It's a heavy duty mount with a low pier for a 10" newton. the scope wasn't there.

After some googling and contacting users I decided to restore the mount use it again.

Some pics of the actual state can be seen on my sit www.debeerst.com

The controller and hand box are included. The RA motor makes a very strange noise. Recorded it on video
It clearly needs some cleaning. It should perhaps be better to replace the motors?

The worm gears also need some cleaning.

Since there is no Newton and I'm using a C11 a higher pier will be necessary. Anyone a higher Fullerscopes pier? ;-)

All suggestions and advice are mostly welcome,

Xavier

I'll take my time to restore it.

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#2 desertrefugee

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Posted 28 November 2012 - 04:18 PM

Wow! Even though it has legs, that beast belongs in an observatory. I would bet it is pushing what, 75 kilos?

Nice project.

#3 xavier

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Posted 28 November 2012 - 05:39 PM

Right, Darell, it isn't a portable setup :-)

#4 MikeMS

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Posted 29 November 2012 - 12:39 PM

Hello,

I have had two of these on loan from my local club. They are very stable mounts and thought of well. A useful conversion is the awr control system and on the website are pictures of the modern motors. You did not say if the mount is now yours, but the conversion is expensive, but cheaper than a new mount of this stableness.
http://www.awrtech.co.uk/retrofit.htm
The existing motors are mains driven and probably not the way to go, with mains voltage in a damp environment.
Fullerscope did a 16" F20 cassigrain to go on the mount.
kind regards,
Mike.

#5 tim53

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Posted 29 November 2012 - 12:49 PM

You could add something like a Sidereal Technology goto kit with Pittman servo motors to that mount for ~$1K or less.

-Tim.

#6 xavier

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Posted 29 November 2012 - 04:51 PM

Thank your for the advice.
Now it's my mount that I received from the local observatory.
My idea is to restore the mount in several steps.
The goal is to replace an old EQ6 with this mount. But first I must be sure that the mount can be fully operational. Now sits a C11 and (of course) a Polarex 3" on the EQ6. It's ok but over the limit. I've upgraded the EQ6 with other motors, FS2 controller and new gears.
I hope that the C11 and the Polarex will be more relax on the MK-IV.
First is to check if the gears still work. The way the mount looks now there must some rust inside. So the mount must be completely taken apart, cleaned and greased again.
Then control the motion of the mount and the worm.
Therefore the original motors must be repaired. I don't think that will be a big problem.
If the mount work I'll consider to replace the original motors with a solution from AWR in combination with the existing FS2.
I've already contacted Alan Buckman from AWR. He's very helpful. He suggested a pulley drive reduction system.
BTW on his website there is also a solution for Unitron/Polarex mounts (http://www.awrtech.co.uk/motors.htm)

I didn't know Sidereal Technology. It looks like a great.
Need to take a close look at it. any experiences with it?
Xavier

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#7 starman876

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Posted 29 November 2012 - 06:12 PM

http://www.awrtech.co.uk/motors.htm
Checking the website it is interesting they mention a drive system for a Unitron, but I really do not see how they do it in their drawings. Will have to study them some more. Thanks for the great link.

#8 tim53

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Posted 29 November 2012 - 06:29 PM

Yes, I had a sitech servo kit on my Takahashi EM-500 for about a year or so. When Dave Groski repaired the drive for the Tak (non goto), I put that back in.

They've got a yahoo group with pix of various conversions. I was able to fit the pittman motors in the Tak mount, and just ran the cables through a temporary cover I made out of a sheet of fiberglass I had laying around:

Posted Image

Not shown is the small control box and the hand controller. The cables from the motors send encoder signals to the control box and get power from it.

-Tim

#9 xavier

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Posted 30 November 2012 - 02:30 AM

Wonderful setup you have. Have to reconsider the Sideral technology solution. Thanks, Tim.

#10 philjay

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Posted 30 November 2012 - 10:30 AM

Wow you lucky chap, Ive been looking for one of those for ages.

I have a similar RA drive on one of my mounts and it should be quiet or give a regular low tick but that sounds like a gear skipping to me.

#11 xavier

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Posted 01 December 2012 - 05:02 AM

Congratulations with your find of the OO setup. Great find.

Yes, I know that I've been very lucky. The local observatory announced in their newsletter that they were cleaning out the old telescopes they don't use them anymore. No one was interested in the Fullerscopes and the Polarex rain pipe refractor.

They still have a 10" Newton by Fullerscopes. Perhaps I'll pick it up this evening.

The sound of the motor is due to the dirt and the paint job. The mount has been painted after it was completely assembled. All the screws are painted in the same way.
Some paint entered the motor. I think after removing it the motor will be fine.

#12 xavier

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Posted 26 December 2012 - 05:19 PM

Hello,

Finally found the time to finish cleaning the Fullerscopes mount.
Was a very nice project. You can see some photos on my website

Ordered two new motors at AWR technology in the UK.

Next step is a pier extension. The pier comes from a Newton. Is much to low for refractors.

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#13 John Carruthers

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Posted 27 December 2012 - 05:27 AM

Dudley seldom made 2 mounts exactly the same. ;-)
The little loose ball bearings in the worms are easily replaced, and the journals can be lightly refaced to help smooth things out.
The original (non export) 240V mains VFO is rugged but a bit long in the tooth now, there are still a few around.

#14 xavier

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Posted 28 December 2012 - 07:08 AM

Thank you, John, for this information.
The mount is completely cleaned and reassembled.
Ready to order the new motors.
Will use a FS2 as controller.
Xavier

#15 xavier

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Posted 13 May 2013 - 03:56 PM

The Fullerscopes IV mount is ready for installation in the observatory.

The mount has been powder coated, new motors, latitude screw and higher pier.

A Polarex 4" is on the mount.
Solid as a rock... Very, very heavy.

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#16 xavier

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Posted 13 May 2013 - 03:57 PM

Detail of the mount and the motors

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#17 xavier

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Posted 13 May 2013 - 03:58 PM

The belt drive

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#18 xavier

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Posted 13 May 2013 - 03:58 PM

The latitude screw

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#19 starman876

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Posted 13 May 2013 - 04:08 PM

Beautiful work. :bow: :bow:

#20 terraclarke

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Posted 13 May 2013 - 04:13 PM

Wow, what a handsome setup. Scope and mount are perfect together. Just beautiful.

#21 Masvingo

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Posted 13 May 2013 - 04:15 PM

Very nice, Xavier, you've done an excellent job!

James

#22 xavier

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Posted 13 May 2013 - 04:19 PM

Thank you, Lady and Gentlemen , for the compliments.

Now waiting for better weather to install the beast in the observatory...

#23 R Botero

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Posted 13 May 2013 - 04:23 PM

Very nice "grab & go" Xavier! :roflmao: :roflmao:

Roberto

#24 xavier

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Posted 13 May 2013 - 04:24 PM

I think, Roberto, that the mount will take me for a walk...

#25 bremms

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Posted 13 May 2013 - 07:35 PM

That mount is a beauty. It should be enough for a 6 or even 8" refractor.






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