8mm Forum: Eumig S 807D running to fast

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Topic: Eumig S 807D running to fast

Jason Moffatt
Expert Film Handler

Posts: 104
From: Denham, Buckinghamshire, UK
Registered: Aug 2014

posted March 21, 2017 01:43 PM

Hi, i know the usual problem with the eumig 800 series is they run slow but my 807 seems to be running slightly to fast ie voices on sound films are slightly to high pitched.Is there any way to slow it down a bit ?.

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted March 21, 2017 03:25 PM

Jason
Slow down the mechanism.

1) Motor running
2) Main switch at STOP
3) Slide the 24-18 knob to a slightly lower position

This should slow down the drive.

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Maurice

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Jason Moffatt
Expert Film Handler

Posts: 104
From: Denham, Buckinghamshire, UK
Registered: Aug 2014

posted March 21, 2017 03:56 PM

Right, i didn't realize.I thought they only ran at the 18 or the 24 setting and not inbetween.

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Joseph Randall
Master Film Handler

Posts: 437
From: Wyckoff, NJ, USA
Registered: Jun 2015

posted March 21, 2017 06:35 PM

Also, check the 50hz/60hz frequency setting.

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted March 22, 2017 06:02 AM

Jason
The Motor in the Eumig runs at a constant speed. The speed of the actual drive varies by means of the sliding movement of the drive pulley wheel onto the large black disc/s which drive the mechanism.
Therefore, the film running speed is variable between 24 and 18 fps.
As Joseph said, you can check that the 50/60 Hz flag is set correctly, although if it is set to 60Hz on our 50Hz mains I think that would make the motor run considerably slower and not faster.

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Maurice

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted March 22, 2017 10:50 AM

NEVER move the speed knob when the projector is in forward, reverse, or rewind, you will damage the rubber discs.
Maurice, does that flag actually do anything? It seems to just sit there, not connected to anything at all.

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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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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted March 22, 2017 03:49 PM

I wonder that too, Paul, although I have never really examined it.
When I buy such a Eumig I always take off the back and if the flag shows 50 horizontally I just replace the back!

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Maurice

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Joseph Randall
Master Film Handler

Posts: 437
From: Wyckoff, NJ, USA
Registered: Jun 2015

posted March 22, 2017 07:46 PM

The 50/60 flag changes the upper and lower limits of the speed slider.

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted March 23, 2017 03:46 AM

Thanks to the reply from Joseph which obviously shows that the motor keeps the same speed whether on a 50Hz or 60Hz supply.

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Maurice

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted March 23, 2017 05:08 AM

Actually the reason the lower and upper limits are changed is because the motor speed is following the line frequency. This way the extremes of your FPS adjustment are still roughly 18-24 FPS at either line frequency.

Otherwise:

-a 50 Hz set machine wouldn't be able to reach 18FPS on a 60 Hz line.

-a 60 Hz set machine wouldn't be able to reach 24FPS on a 50 Hz line.

[ March 23, 2017, 05:12 PM: Message edited by: Steve Klare ]

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All I ask is a wide screen and a projector to light her by...

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted March 23, 2017 05:12 AM

It seems I was wrong for which I apologise.

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Maurice

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted March 23, 2017 05:22 AM

Please don't apologize!

We've had a lot of things said here over the years that are a lot more apology worthy than that!

As I understand it, the frequency setting on these makes different ranges of the drive disk available so you have a different range of (umm..) "gear ratios" to match the motor speeds to the desired shaft speeds for the two FPSs.

I think it's a wonderfully simple system. Today you couldn't do something like this without spending a couple of weeks coding.

Yes, it has it's troubles this far down the road. -still doing better than my left knee!

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All I ask is a wide screen and a projector to light her by...

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted March 23, 2017 10:41 AM

Otherwise known as a continuously variable transmission (CVT). Just like my Honda Accord! [Big Grin]

--------------------
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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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted March 23, 2017 11:08 AM

Exactly!

I did 217,000 miles with a five speed manual. Now I find myself manual shifting my Civic even with the automatic. (It would be a hoot with a stick!)

I know CVT is a great thing, but it might be a bridge too far for me!

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All I ask is a wide screen and a projector to light her by...

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted March 23, 2017 11:31 AM

I have mixed feelings about CVT Steve. On my Accord the CVT is absolutely flawless with no feeling at all that anything is going on, unless you watch the tachometer. In fact I have read in motor trade journals that Honda have the best CVT on the market. And it saves on gas.
On the other hand I sometimes miss the change surges you get with a traditional automatic transmission, and nothing beats a manual transmission if you really want to get a driving experience.
I just home my Honda CVT does not start slipping like the Eumig CVT! [Big Grin]

--------------------
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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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted March 23, 2017 02:46 PM

OK, off topic....(apologies.)

The transmission of the future is electric propulsion, whether full electric or hybrid.

-smooth as silk and the engine (-if any) operating at the exact right speed for power or efficiency.

The Ferraris and Maseratis of the world are in kind of a bind right now. You can go faster with a generator, a battery and four motors on the wheels, but the driver experience is better with that third pedal and a stick shift. (What'll it be?)

My Mustang GT could smoke the tires going into first, and second a little too.

-kind of barbaric propulsion, but we should be young at some time in our lives!

My own Eumig 800 series hasn't slipped once in 14 years. I hope it never does.

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All I ask is a wide screen and a projector to light her by...

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