8mm Forum: Elf Running speed help please. NT1

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Topic: Elf Running speed help please. NT1

Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003

posted November 12, 2017 07:42 AM

Hi all,
my NT1 is all up and running and has been for a few months now. Although everything seems ok it does appear to be running very slightly slow. everything is well oiled and greased where it should be, and the belts are fitted correctly, its only slight, possibly 21fps ish, noticed on some films not others, no wow or flutter,
I recently had it stripped down due to the problem of old grease etc, cleaned it all up nice and re oiled and greased everything up.
Belts all ok, quite baffling. Any Idea's please?

BTW, The motor belt is on the correct pulley [Wink]

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David Fouracre
Expert Film Handler

Posts: 123
From: Staffordshire, United Kingdom
Registered: Aug 2013

posted November 12, 2017 07:55 AM

Check motor capacitor by substitution.
Perhaps worth a try.

David

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David Guest
Phenomenal Film Handler

Posts: 1704
From: Lancashire, UK
Registered: Oct 2011

posted November 12, 2017 01:23 PM

yes motor cap and also cam tank

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Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003

posted November 12, 2017 02:39 PM

Thank you.
I know the cam tanks fine now. By motor cap is that the capacitor?

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Robert Tucker
Jedi Master Film Handler

Posts: 688
From: Essex, UK
Registered: May 2005

posted November 12, 2017 05:02 PM

Yes that would be correct. These tend to dry out and need to be replaced as with most capacitors over time.

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Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003

posted November 14, 2017 12:44 PM

Thank you all, i will give this a go. [Wink]

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Kevin Clark
Jedi Master Film Handler

Posts: 978
From: Bapchild, Kent, UK
Registered: May 2004

posted November 14, 2017 01:00 PM

If it is about 20% slower and running that speed constantly Tom I would personally have thought it may have a 60hz motor pulley fitted instead of the 50hz one it should have for UK use?
When the AC motor capacitors develop problems it is more likely the motor won't start at all or run weakly / uneven speeds and possibly get hot too.

If it is the motor pulley Grahame Newnham sells them for £8 each, on his list as follows:

***** Motor pulleys for Elf/Eiki projectors, 24/18fps £8 each *****
* Replaces 60Hz pulley on machines (mostly 110volt), that run slow in UK! *

Kevin

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Maurice Leakey
Film God

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

posted November 15, 2017 03:32 AM

Tom
I understand that the capacitor provides a "strike" surge to start the motor. If the capacitor is faulty it is probable that the motor will not run at all.
You say the motor belt is on the correct pulley. However, both belts must be on their correct pulleys.
For sound speed the belt must be on the large pulley from the motor, and directly opposite the small pulley on the shutter spindle.
Have you checked the plate to see if it is a 60 Hertz (Cycles) model as suggested?

--------------------
Maurice

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Kevin Clark
Jedi Master Film Handler

Posts: 978
From: Bapchild, Kent, UK
Registered: May 2004

posted November 15, 2017 04:25 AM

Tom - If this is the extra projector you were sent as a parts machine then. knowing its source, it could very well have bits and pieces from other machines in it hence there could well be a 60hz motor with 60hz pulley fitted regardless of the plate on the back of the projector. Constant speed drops are not the usual effect of duff AC motor capacitors as I said in my post above.

Kevin.

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Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003

posted November 18, 2017 10:14 AM

Thank you all again for the replies,
All the pulleys are correct, the motor and capacitor are actually from my spare machine, (i bought a new capacitor and this one is now fitted to my original motor as a spare).

Here's something strange, i put Blue Thunder through last night, all was perfect, it appears that only one or two films are noticed at the slightly slower speed, is there such a thing as this, (without sounding stupid?) [Confused]

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Maurice Leakey
Film God

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

posted November 18, 2017 02:42 PM

Tom
You could check the speed by running a known length of film (in feet) against a stop watch, or a watch with a second hand.
100 feet of 16mm running at 24fps should take 2 minutes and 47 seconds.

--------------------
Maurice

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Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003

posted November 18, 2017 03:32 PM

thanks Maurice, i will try that tomorrow evening.

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