Saturday, 19 December 2015

Unimat SL slow speed motor bracket.

One of the many accessories available for the SL is a replacement motor bracket fitted with an additional idler pulley set (part number 1280). This is used to give two additional slower speeds, these being 155rpm and 300rpm (with the standard bracket fitted the slowest speed is 365rpm).

Fitting is a straightforward swap, but another small standard belt is needed. Removing the bracket is covered here.

Here's the standard bracket;


Note that I've had to cut away part of the wooden base to clear the new bracket.

Both parts side by side;


And the new bracket fitted;


In the above photo the machine is set at 155rpm.

Paul.
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5 comments:

  1. Julias Modelopolis19 December 2015 at 16:44

    Thats a useful little addition. You just need to develop a screwcutting attachment now, the unimat one isnt the best idea in the world.

    Julia.

    ReplyDelete
    Replies
    1. Paul B.19 December 2015 at 17:45

      Usefull it certainly is, I've just been drilling and reaming EN1a ready to make a couple of tool holders.

      The Unimat screwcutting attachment seems to be well liked on the SL Yahoo group. I can't imagine needing to screwcut anything at the moment, in fact any thread size over 10BA looks massive when you're working on our kind of models!

      Delete
    2. Simon Dunkley20 December 2015 at 02:34

      The screw cutting attachment is a thread follower, as the SL does not have back gearing, so the auto traverse cannot be linked directly to the spindle rotation speed. I think that for most modelling needs, standard taps and dies are sufficient.

      Delete
  2. Julias Modelopolis22 December 2015 at 12:53

    True, a screwcutting attachment is not an everyday thing, I wanted to have a go at some worms for some gearboxes. It would be nice to have the ability to make some to a desired diameter.
    not essential, just a nice to have.

    Julia.

    ReplyDelete
    Replies
    1. Paul B.22 December 2015 at 13:46

      I see your point Julia. One of the reasons that I wanted a lathe is the freedom to make things to to own ideas and specifications and not be restricted to standard off the shelf parts. And to make nicer chimneys! I haven't wanted to make gears yet, but it would be nice to have the knowledge and tooling to do so if I wish.

      Delete

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