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1M Hand Cranked


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#1 Paul Bruening

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Posted 08 January 2010 - 06:14 PM

As I understand it, The gray bodied 1Ms have a governor in them that regulate speed on the spring motors. Do they do the same for hand cranking or does the operator have to monitor speed while cranking?
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#2 daniel mahlknecht

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Posted 09 January 2010 - 04:05 AM

As I had understood it, in handcranked filming, the Handcranker has to keep the right speed, what helped him was a musictune with a corect beat to crank folowing this rythm.
No guarantee that this in 100% thru...

daniel
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#3 James Steven Beverly

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Posted 09 January 2010 - 06:12 AM

As I understand it, The gray bodied 1Ms have a governor in them that regulate speed on the spring motors. Do they do the same for hand cranking or does the operator have to monitor speed while cranking?


Not that I noticed but the handle is short so it's hard to crank fast. My needs to be serviced and greased so once I have that done, it might crank more smoothly.

Edited by James Steven Beverly, 09 January 2010 - 06:13 AM.

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#4 Paul Bruening

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Posted 09 January 2010 - 02:35 PM

Specifically, the 1M with built-in governor.
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#5 Paul Bruening

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Posted 12 January 2010 - 01:57 AM

Holy smokes. Is this a question without a known answer?
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#6 John Sprung

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Posted 12 January 2010 - 02:04 AM

Holy smokes. Is this a question without a known answer?


Maybe, if Olex hasn't answered it yet. I wouldn't know about the 1M, but I do know that on the Eyemo, the governor works both for spring drive and hand cranking. If Meredith Viera was asking, I'd guess that they both work the same way..... ;-)





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#7 Olex Kalynychenko

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Posted 12 January 2010 - 03:16 AM

Maybe, if Olex hasn't answered it yet. I wouldn't know about the 1M, but I do know that on the Eyemo, the governor works both for spring drive and hand cranking. If Meredith Viera was asking, I'd guess that they both work the same way..... ;-)
-- J.S.



Yes, the ideas about mechanical speed control similar at many type of cameras.
Eyemo and Konvas-1 had similar devices.

I wrote about Konvas system of mechanical speed control at

http://www.cinematog...showtopic=40847

The mechanical system of speed control do not important, what kinds of device of rotation you will use.
The camera can have DC motor, spring motor or hand cranked.
The important - the speed of turn of main axis of claw mechanism must be more high from value of final speed, because, the mechanical speed control device must have spare speed for control.

This is like of electronic system of speed control.
The battery give of 12 v to DC motor, through power transistor of speed control.
If the power transistor set IN, 12 v give to DC motor
and DC motor l run at 6000 rpm.
We will have speed near 50 fps.
But, we need 24 fps.

That's why, the electronic give pulses on power transistor and transistor give to motor 8 v (
root-mean-square current ) and we have 24 fps.
The speed control system have spare voltage on speed control ( 12v - 8v ) and can control of final speed at fixed value.

The similar idea at mechanical system of speed control.
We must receive torsion torque for speed 40..50 fps
from rotation device.
The mechanical system of speed control give of brake resistance and we will have speed at final 24 fps.
And, the system will have spare torque force for control of final speed at fixed value ( 24 fps ).

As of hand cranking,
You do not need control of speed at speed meter at time of shooting.
You need turn of hand crank with more high speed from need value.
The mechanical speed control system will give of additional brake resistance and final speed of shooting will 24 fps.
The value of additional brake resistance can be adjust by change a position of lever on body of speed meter device.
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#8 Olex Kalynychenko

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Posted 12 January 2010 - 04:04 AM

P.S
As of mechanical diagram of Konvas-1 ( KSR-1, KSR-1M ) camera.
The speed of rotation of hand crank must be 178,6 turns per minute ( near 3 turns per second ) and you will have speed of camera 24 fps. ( 1440 turns per minute).

The axis speed of speed control device will 2880 turns per minute.
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