8mm Forum: Eiki speed variation

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Topic: Eiki speed variation

Jason Moffatt
Expert Film Handler

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

posted August 15, 2018 03:20 PM

Hi, i have two eiki st/m projectors and one seems to run slightly faster than the other, while its not a major problem its a bit annoying.Both machines are set at 24fpm and with the same 15 min film one plays it about a min faster than the other and every now and again you notice the voice tones seem a bit high on the faster one so i would assume the slower one is running at the correct speed as they sound ok.Is there any way to slightly adjust the motor speed?.Could it be something to do with the motor belt thickness?.

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Nantawat Kittiwarakul
Master Film Handler

Posts: 280
From: Rajburana, Bangkok, Thailand
Registered: Aug 2017

posted August 15, 2018 08:11 PM

+- 1-2% speed error would be totally common,but not in this case (6.7% fast? [Roll Eyes]

). That is still however not enough for 50/60 Hz issue.
So yes,if it's me I'd try the simplest solution by swapping the belt first. The next suspect would be the motor pulley itself.

BTW if you can somehow find a tachometer to check the actual motor speed,that would give a lot more hints to this problem. [Razz]