Re: Cirkut calibration

[Steve Shapiro <sgshiya@xxxxxxxxxxxx>]

Subject: Re: Cirkut calibration


> Get ready for a round of true frustration.
>
> Actually it isn't too hard to adjust the governor on a #10 cirkut.  First
> you should totally disassemble and clean the entire camera, but if you are
> in a hurry, this is what I would do:
>
> Run down the motor and check the end play in the governor.  This is
adjusted
> by loosening the nut on top of the governor and screwing in or out the
screw
> on top.  Don't tighten it too much.  The original factory setting was
quite
> loose (noticeable end play).  Toward the top of the ball springs you will
> notice a small collar with two set screws.  This allows the ball spring
> assembly to move up and down.  First, set the speed selector to the
slowest
> speed (one half second).  Then slightly loosen the set screws on the
collar
> and move it up or down to achieve the right speed for one half second.
This
> is trial and error with a lot of tries.  It is a good idea to adjust the
> speed selector up and down after making an adjustment and start and stop
the
> motor a couple of times before timing the speed.
>
> Determining the speed is easily done by timing say three revolutions to
get
> a good one drum revolution speed. Then use this simple formula for
> calculating the speed:
>
>         drum circumference             slit width
>         -------------------             =       -------------
>         time one revolution               effective shutter speed
>
> The drum diameter of a #10 camera is usually 3 5/8 inches or 11.39 inches.
> The slit width is usually 1/4 inch or .25 inches.
>
> In other words,  (time of one drum revolution) times .25 divided by 11.39
=
> effective shutter speed.
>
> The real frustration comes after getting the 1/2 second speed adjusted
> properly.  It is then that you notice that the other speeds are not
correct.
> The problem is not easily fixable.  The ball springs have lost the
original
> tension and allow the balls to spin at a different speed.  This can be
fixed
> by making new springs, but only with great difficulty.  For myself, I need
a
> good slow 1/2 second, and anything after that is negotiable.  If you know
> that 1/10 is actually 1/15 is that so bad?  And you might get lucky and
have
> a camera that will actually adjust to ALL speeds correctly.  Most cameras
> are within 20% of the right time, and you should be able to hone that to
10%
> if you're fussy.
>
> I cannot over emphisize that in order for a #10 camera to run right, it
must
> be thoughly cleaned and oiled or you don't have a chance of keeping the
> previous adjustments.
>
> good luck
>
> Ron Klein
>
>
>
>
>
>
> ----- Original Message -----
> From: Scott Davis <sddavis@xxxxxxxx>
> To: <panorama-l@xxxxxxxxxxxxxxxxx>
> Sent: Monday, August 02, 1999 4:37 AM
> Subject: Cirkut calibration
>
>
> > Does anyone know how to adjust the governor in a Cirkut to the correct
> > speed?  I would like to get it to agree with the speed setting on the
> > magazine.  We're talking about a #10 camera with key wound system.
> >
> >
>
Just finished cleaning my #8 for the second time; and minor pecuneriaties
need answers.

You wrote, Oiled.  Didn't previous discussions describe in threatenoning
detail about grafite powder, never oil?

When reassembling the spring housing there's a plate on top, held by three
posts, be sure to grafite that, too?  ... when it slips over the spring
housing ... ?

There's a break shoe on tip of the governor spindle that rides over the
gear-speed adjustment.  BE SURE IT'S NOT TWISTED!

Okay ... what's the reccomended libricant for the gears?

Steve Shapiro, Carmel, CA