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Thread: Rack and pinion for 20x24

  1. #1

    Rack and pinion for 20x24

    Iím working on a new 20x24 camera and Iíd like to build in a rack and pinion for rear standard focus. Does anyone have any ideas where something applicable might be found or how to source? It isnít the end of the world if I canít find it and it becomes a fixed rear but it would be nice. Any ideas appreciated.
    Francesco Fragomeni

  2. #2

    Join Date
    Aug 2018

    Re: Rack and pinion for 20x24

    Something like this, ebay item 333941702654

    And this 294228484531

    These will not fit together I believe.

    Sent fra min SM-G975F via Tapatalk

  3. #3

    Join Date
    May 2015
    SooooCal/LA USA

    Re: Rack and pinion for 20x24

    Maybe rack & pinion not needed???

    I made a camera that standards just slid on smooth metal to teflon to wood surfaces with a precision T-slot underneath where guide rollers kept it moving straight and a lock... Another locking block with a threaded rod that threaded into base of standards had a knob to turn to focus pushing/pulling...

    You would open up camera, slide standards to about correct positions, lock down screw block, and turn focus knob for fine focus... Works well, and much cheaper/easier to make...

    Sorry, no pix as camera is in deep storage now. :-(

    Good luck!!!

    Steve K

  4. #4

    Join Date
    Jun 2001
    North of Chicago

    Re: Rack and pinion for 20x24


    Richard Wasserman

  5. #5

    Join Date
    Jan 2009

    Re: Rack and pinion for 20x24

    Many continental large format cameras used a central long ACME thread with an attractive end brass turn handle and a fixed threaded brass block at the base of the rear standard. Obviously, both sides of the standard run in slots and the ACME threaded rod is allowed no movement.

    Lots of lengths available. There would be some amateur “mechanical “ work necessary to add on the turn handle and the interior non precision bearing.

  6. #6
    Tin Can's Avatar
    Join Date
    Dec 2011

    Re: Rack and pinion for 20x24

    Japan and USA also

    As I have posted I am working on AF screw drive using things like this with stepper drive

    for AF Studio camera conversion

  7. #7

    Re: Rack and pinion for 20x24

    I don't have the equipment for machining or making any kind of precision T cuts or anything like that. I make all of my cameras using fairly basic hand tools. I think the rack and pinions from McMaster that Richard linked may be what I'm looking for if I go with rear focus. I matching set from them would make a fairly straight forward job of it.

    Thanks for the replies all. Much appreciated.
    Francesco Fragomeni

  8. #8
    Tracy Storer's Avatar
    Join Date
    Nov 2001
    Oakland CA

    Re: Rack and pinion for 20x24

    24 pitch, 20į pressure angle is probably a good size. The face width of the rack and pinion / spur gears is typically 1/4". If you are in EU, then you might want to source metric gearing which is measured differently ("Module" rather than "pitch"). Wikipedia has a good page on gearing.
    Tracy Storer
    Mammoth Camera Company tm

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