Incorporated January 2006
Using A Tortoise in a tight space
When one has several dozen turnouts in a layout, at least one will inevitably fall directly over a bench support girder or other obstruction.I had one just off center over a 2x4 beam that joined two pieces of plywood. While there are various clever ways to remote mount the motor, including one sold specifically for the tortoise, most, if not all, of them would have required some cutting of the beam.
I decided that since I had the cutting tools out anyway, I should find a way to extend the throw wire horizontally away from the machine itself. This would allow me to mount the machine next to the beam and not use any additional linkages. Here is my simple solution.
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A) I always substitute
a length of 0.039" piano wire for the supplied throw wire (which is too short
and too weak to use through plywood plus extruded foam sheets). The
extra offset is clearly visable and can be a lot larger if necessary, but
keep it as small as practical for the situation at hand. B) I have begun to rout out the beam with a small foerstner bit to half of its depth.. The piano wire locates the throwbar of the turnout above. After this step, I squared off the hole with a sharp wood chisel. I only needed enough room for the wire, pivot and fulcrum to fit inside of the beam. Sorry, I forgot to photograph that step. C) This is the tortoise in place almost touching the beam. Caution! Connect wires and adjust the fulcrum before installing the mounting screws. It's easy to slip the fulcrum out of the groves if you cannot see what you are doing. I used double stick tape as a temporary mount. D) The entire mechanism has worked fine from the start. |