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  1. #11

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    My timer is a standard DeVere unit with three time controls 10 secs, 1 sec, .1 sec connected to a DeVere 240V control unit. The fans come on when the power is turned on via the control unit; exposure seems to operate as a separate function. I would have thought it was advantageous to have the fans running constantly when the unit is on to dissipate heat from the head and bulbs.

  2. #12
    Ian Grant's Avatar
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    OK, my colour head has an adjustable relay that allows me to set a delay so the fan turns off immediately or up to 10 or 15 seconds after the lamps. This is probably non standard. It's an RS components relay I'll see what the circuit is in Sept/Oct.

    Again some slide projectors had something similar built in to protect the lamp.

    Ian

  3. #13

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    Just measure that lip on the flange, that has to fit inside the hole you drill. Drill just under-size then file it out until it fits. Then With those rear elements unscrewed (as in the photo) you should be able to mark and drill the flange and secure it.
    Ian,

    How did you go about drilling the hole?

    Tom.

  4. #14
    Ian Grant's Avatar
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    Tom I used a hole cutter, slightly under the final size, the type that fits a drill, I clamped the panel to a piece of old wood as it requires a pilot hole, then I filed the panel to fit with a medium/coarse half round file.

    Ian

  5. #15

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    Tom I used a hole cutter, slightly under the final size, the type that fits a drill, I clamped the panel to a piece of old wood as it requires a pilot hole, then I filed the panel to fit with a medium/coarse half round file.
    A standard electric power drill? I wasn't sure if the hole would need to be machined out...

    Are you referring to this type of hole cutter?:

    http://www.screwfix.com/prods/26065/...t-Holesaw-76mm

  6. #16
    Ian Grant's Avatar
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    Yes, the secret is in the final filing, that's what should be reasonably neat & precise. The holes on camera & enlarger lens boards are often quite crude because the lens flange forms the light seal, and the screws or nuts & bolts secure the flange & lens to the board.

    Ian

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