broken spring on an SP-15

hi all

I’m calling on the fount of collective knowledge here with a technical question. I’m refurbishing an sp-15, and as I was cleaning up the underside of the cylinder carriage I noticed that a rocking lever arm (what is I assume part of the trip mechanism) was sprung with a flat spring on one side – the operator side – but not on the other side. Closer inspection revealed that the spring on the far side had snapped off at some point. My question is – it appears a very complicated operation to replace the spring, is it essential for the press operation?

with thanks and best wishes

john christopher
arcane device press

9 thoughts on “broken spring on an SP-15

  1. Fritz Klinke - May 16, 2007

    Don’t worry about the part number–I know what you need. We just need your information.

    Fritz
    nagraph@ekiva.net

  2. The Arm NYC - May 15, 2007

    Paul,
    The tool was custom made from the drawing in the manual by Perry Tymeson. Not a Vandercook original, but it works flawlessly.

    Daniel

  3. john christopher - May 15, 2007

    Thanks again for all your comments – I’ve now chiselled the broken spring off with ease – just need the part number…

  4. john christopher - May 15, 2007

    Thanks for all your help everyone – i’m in the uk – unfortunately a bit far for the repairman! If someone could post the part number for the spring I’ll order one from Fritz together with the (half-tone) manual. When I looked at it I assumed I would have to take the whole carriage apart to repair it – please say that isn’t necessary…..

  5. Paul Moxon, Moderator - May 14, 2007

    Dan: Is this tool the original J-19553 Assembly Tool? Whether it is or isn’t, could you please post a pic.

  6. The Arm NYC - May 14, 2007

    John,
    Where are you located? I know someone with a tool to change this spring.

    Daniel Morris
    The Arm Letterpress
    Brooklyn, NY

  7. Eric Holub - May 14, 2007

    I should have said, it is in one version of the SP-15 manual. I have two entirely different versions; one with line drawings and halftones, and one with halftones only.
    The spring repair is shown in the version with halftones only. The same sheet is in the SP-20 manual.

  8. Eric Holub - May 14, 2007

    That spring, and instructions for removing it, are in the SP-15 manual. The side of the cylinder without the spring will stay right where it is and will not raise and lower as the opposite side does. It is a necessary repair.
    I’ve already mentioned here the possibility of pulling off the stub of the spring with a hook, rather than chiselling it off as per Vandercook instructions, but with the carriage off the press it should be a rather simple task.

  9. john christopher - May 14, 2007

    ps you can see what i’m talking about at http://www.flickr.com/photos/8286330@N03/497998636/

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