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Topic: GS1200 Green guides

Jason Smith
Master Film Handler

Posts: 358
From: Tohoku, Japan
Registered: Oct 2015

posted October 05, 2017 08:58 PM

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quote:
I simply wrapped the tensioner with a teflon tape, a low friction material that easily adapts itself without bonding it.

I really like that idea. I heard of using aluminum adhesive tape to cover the parts that wear on the GS-1200 on another forum. I always wanted to try it out but was a little afraid to. I heard that the aluminum tape wears but at a slow rate. I would like to try your idea Renzo.

I have tried a lot of different solutions for that lower tensioner. As suggested on another forum, I reshaped the lower tensioner where it had worn with a soldering iron back to its original shape. After using my GS-1200 for a year and a half though, I noticed where the lower tensioner was starting to wear again.

I hear that Leon Norris also sells a lower tensioner roller mod for the GS-1200. That might be a solution for anyone who wants a more permanent solution.

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Graham Ritchie
Film God

Posts: 4001
From: New Zealand
Registered: Feb 2006

posted October 08, 2017 01:28 AM

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Well I made an effort to do something about that tensioner.

I think what Jason has done is the way I want to go, I do like the roller idea.

Anyway I had a look through my junk box, but could only find this old roller, that got me thinking, why not drill it out and slip it over the tensioner as its length is spot on. The problem came up against was fitting it, in that on start up for the first few seconds it was just touching the sprocket. In the end , not giving up and unable to move the tensioner to the right, I ground the white roller down, used a small amount of Arladite only the top surface of the black tensioner to the white roller, or what was left of it. Thinking that someday I want to get to the original black guide I was carefull with the Arlidite...just a we bit not to much.

Well its a temporary fix that should last for a while, until I can come up with Jason roller idea which is much better, however the tensioner worked well, kept position nice and steady..

After running my favorite film through a few times, I am happy...

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Graham Ritchie
Film God

Posts: 4001
From: New Zealand
Registered: Feb 2006

posted October 23, 2017 10:50 PM

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Well I have been a busy little bee on this GS1200 [Roll Eyes]

[Roll Eyes]

although what I did to the black tensioner worked fine, I still felt I could do better, so removed it and fitted a rotating rubber roller I found from an old ST1200.

It took a while to change things over, but the end result and after a lot of testing.. threading.. stopping and starting it seems to work fine. After a couple of seconds on start up the roller finds its own position and stays in the one spot happily turning away. I think thats all the mods I need to do on this machine, better get back to watching films [Smile]

[Smile]

I fitted shims to either side of the roller and altered them in or out just a we bit to get the roller in the right spot running on the film..

I could trim the lenght of shaft back, but its fine and does not get in the way of the projector side cover... I might just leave it [Smile]

[Smile]

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Thomas Knappstein
Expert Film Handler

Posts: 124
From: Erwitte, Germany
Registered: Oct 2017

posted October 26, 2017 11:20 AM

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Hello Graham!

Very Very good Work youve done on your GS. I had put in this second little Roller in the green Guide over the Sprocket over 25 Years ago when i started with collecting full feature Films in 1991. The Machine makes no Scratches on every Print in my Collection. The lover tensider Roller from an old ST 1200 HD I have in my Machines to. Interesting is the fixing of this worn out Sound head Part. I have repaired this Part for a machine with the backwards Loop. Next Time I will upload some Picture here. Do you have long Arms and Focus remute on your Machine?

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Graham Ritchie
Film God

Posts: 4001
From: New Zealand
Registered: Feb 2006

posted October 26, 2017 03:00 PM

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Thanks Thomas [Smile]

[Smile]

I dont have long arms or focus remote, although years ago I did make a long play unit and large reels that clamped onto the GS handle that could easily take 2-3hrs of film non-stop.

Look forward to seeing your photos...your focus remote sounds very interesting. [Cool]

[Cool]

Graham.

[Smile]

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Steven J Kirk
Jedi Master Film Handler

Posts: 873
From: Southern England
Registered: Apr 2008

posted October 26, 2017 03:23 PM

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But surely if the 'kick-start' on the flywheel is set properly the film doesn't touch the lower tensioner but runs like a 3rd loop. You can only see this when the machine is running. Where the film is when stopped isn't an indication of if the tensioner is touching.

--------------------
VistaVision
Motion Picture High-Fidelity

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted October 26, 2017 05:01 PM

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On both my GS1200'S the tensioner is pulled up by the film, so the film is always in contact with the tensioner during forward projection. The tensioner should be steady and not float up and down, which can produce WOW on these machines. It really is a complex film path compared with, say, Eumig's, and I sometimes wonder if that sprung tensioner was a 'fix' of some kind. I still don't understand how the GS'S set the 18 frames picture to sound separation during auto threading.

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Thomas Knappstein
Expert Film Handler

Posts: 124
From: Erwitte, Germany
Registered: Oct 2017

posted October 27, 2017 11:54 AM

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Here is one Picture of my focus remute Motor.
It is a Stepper Motor with a Worm Gear for präcise focusing.
And one pic from my Machine with 3200ft Reels on.

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Thomas Knappstein
Expert Film Handler

Posts: 124
From: Erwitte, Germany
Registered: Oct 2017

posted October 28, 2017 12:29 AM

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Here are some other Pictures from
repaired and modificated Parts of the GS1200
The last Picture shows an alternate Main Motor wich comes from Dunkermotoren. A Factory in Germany. The Speed control Tachometer I have changed by a wheel ith 24 Holes in and an optical IR Light Sensor.

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Graham Ritchie
Film God

Posts: 4001
From: New Zealand
Registered: Feb 2006

posted October 28, 2017 12:49 PM

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Thomas those are amazing mods you have done to the GS1200 [Cool]

[Cool]

In particular the main motor...can you still vary the speed from 24fps to 18fps? [Smile]

[Smile]

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Thomas Knappstein
Expert Film Handler

Posts: 124
From: Erwitte, Germany
Registered: Oct 2017

posted October 28, 2017 12:58 PM

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Hi Graham!
Yes the Speed can be switched from 18 to 24 and variable.
But ll my GS have two blade shutters so there is flickering on 18 frames per second. My 18 frames own made films I played on a ST 1200. I have one Pic. from repairing the Calw Mechanic of a GS 1200 . There you can see the two blade shutter. Your little rollers on the upper Sprocket guide are very good. I dont have a machine to make those Parts.

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Graham Ritchie
Film God

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From: New Zealand
Registered: Feb 2006

posted October 29, 2017 03:08 AM

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Thanks Thomas [Smile]

[Smile]

I also fitted a two blade shutter to this particular GS1200 and use other Elmo three bladed projectors for the 18fps. [Cool]

[Cool]

I made my own two bladed from a old B/H 16mm a few years ago..

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Thomas Knappstein
Expert Film Handler

Posts: 124
From: Erwitte, Germany
Registered: Oct 2017

posted October 29, 2017 05:23 AM

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Very nice work. Its much brighter with the two blade shutter and the Elmo 1:1,0 Zoom Lens.
What do you say about my focus remute?

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Graham Ritchie
Film God

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From: New Zealand
Registered: Feb 2006

posted October 29, 2017 12:50 PM

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Your focus remote is really something [Cool]

[Cool]

does it clamp onto the focus knob? The great thing about your remote is that you can sit and watch the film without getting up to adjust things even slightly.

Thomas you need to make a short video one day showing all this working [Cool]

[Cool]

[Smile]

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted October 29, 2017 02:15 PM

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Graham...very nice DIY two blade shutter [Smile]

[Smile]

--------------------
Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted October 30, 2017 12:53 AM

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Hello Thomas,

Very interesting modification that you introduce for main motor.

Could you tell me more for alternate motor parameters (means : Maxi Voltage, I max, Power max, speed max.....as possible).

Also, Speed Control conversion (From Tacho to Infra Red) is the future when a motor fails now, as it is more and more difficult to find a small motor with "Tacho Generator" integrated.
(I have this improvement "on left" for my Beaulieu's machines)
Moreover, using a brushless motor should be a nice improvement too.
So, before former motor replacement done, did you record tacho frequency in the aim to determine holes pattern for Infra Red Disk ?

Is aleternate Motor used is brushless or not ?

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Thomas Knappstein
Expert Film Handler

Posts: 124
From: Erwitte, Germany
Registered: Oct 2017

posted October 30, 2017 01:30 AM

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Hello Graham! I dont know how I can upload a video here.
Please check your private Messages on Facebook. Ihave send two Pics about my Projection Booth.

Hello Phil! The Infrared Tachometer you only need if there is no original Motor avalaible. If you have the old original Elmo Motor you can cut it of and take the original Tacho out. Than mount it on the new Dunker Motor. My English is not so good tho explain every Detail. So look at he folowing Pictures. I must take some Photos of the IR Version. The Wheel must have 24 Holes in it. And you must get 6V from the Pulse conector of the Elmo. And than Pulse Rec is out of Funktion. I take a look into the Service Manuel of the GS 1200. There you can read that this Tachometer gives 24 Pulses per Round. Also I drilled 24 Holes in my Disc and check the Waves on an Oszilloscope. They are nearly the same as the original Tacho gives out. With a few resistors you can manage this.

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Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted October 30, 2017 12:38 PM

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Hi Thomas,

Thanks for the pictures.

I found this for this Motor family :
ALTERNATE MOTOR

Moreover, It includes a front Ball Bearing, this is much better than original ELMO motor.

I assume Infra Red solution is also much better due to the "Square Signal" generated (instead of a classical waves generated by Tacho).

BEAULIEU"s Tacho Main motor generates around 800 Hz (24 fps Mode).
So, I assume a 15 Holes disk will work.
Infra Red modules I use are supposed to work under 5V.

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Thomas Knappstein
Expert Film Handler

Posts: 124
From: Erwitte, Germany
Registered: Oct 2017

posted October 30, 2017 12:59 PM

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Hi Phil!
The Motor I use has Ball bearing on both sides. This Motor runs in all of my GS machines over 10 Years now without any Problem.

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Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted October 30, 2017 01:34 PM

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You are certainly a breath of fresh air Thomas, with your innovative ideas and add on's for the GS. I see you have the long play arms on your GS projectors, how are the motor holding up, or have you found an alternative motor for this too.....

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted October 30, 2017 08:01 PM

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That's a very ingenious focusing system that Thomas has come up with, but I wonder just how well it works, as the 'backlash' in the GS1200 focusing knob is pretty significant.

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Thomas Knappstein
Expert Film Handler

Posts: 124
From: Erwitte, Germany
Registered: Oct 2017

posted October 31, 2017 01:45 AM

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Hi Paul!
You can turn the Focus remute Poti (special one) and the Motor gives it 1:1 on the Focus Knob on the Elmo. So you have the same feeling as you turn the Knob itself. I have one Poti nearly to the Screen. So I can turn the Sharpness very exactly.

Paul Browning!
The take up and rewinding Motors are still the original ones. They did a good Job over 25 Years now. Bu I dont rewind My Films on the GS. I have a seperate Motor Rewinder.

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Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted October 31, 2017 01:58 PM

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Fair comment Thomas, perhaps someone will find a new motor for the GS that can do both, the long play arms don't look out of place on the machine, and 25 years of use not bad, and a simple design that works, no complicated clutches and ratchets that no one understands.....

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Burton Sundquist
Master Film Handler

Posts: 318
From: Burnaby, B.C. Canada
Registered: Feb 2017

posted August 24, 2019 01:10 AM

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I have read the thread and realize that these mods are essential. Let's face it. The Top of the line Super 8 projector WILL scratch film. I previously blamed the Van eck guide. This was wrong. His roller did not cause a green emulsion scratch.
GS related issue I WILL deal with.

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Leon Norris
Jedi Master Film Handler

Posts: 958
From: Elkins Park, PA, USA
Registered: Jun 2012

posted August 24, 2019 09:12 AM

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Just remember I have plenty of new green guides in stock! For the GS1200 projector! Always check those guides!

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