My MARVELOUS MACHINE is 'driven' by steam. To properly control suck a divide we needed a mechanical throttle, much like what one would find in an old steam train engine. I had built a similar throttle for our train steam engine last year. I had considered using the same file but I didn't need a reverse on this machine.
To build the throttle I first needed a segment of a cogged wheel. I built the teeth which I would use to cut out the sprocket. I then used the jigsaw tool to create this vector.
I then drew up some lines using the drawing tools. This would form the outline of the base of the unit. I positioned this over the partial sprocket I had previously created. By adding the various circles and sections and using the jigsaw tool I created the final shape.
I built up various shapes using the drawing tools and then combined them to create the long handle, pull lever and various other bots and pieces.
I was originally going to use a tapered base but opted for a box design because of space considerations. In the screen shot below the shapes for the pieces are created. A few last pieces still need to be merged together.
The throttle lever was assembled with a combination of bolts and welding. It too went together in a hurry. There is a bolt on access panel in the bottom box to facilitate mounting an electric micro switch inside which will be actuated by the lever.