Crank details

Having a heavy load at work this past week, I wasn't able to get much done on the project, but I did play around with the crank parts to get them closer to being finished.


Consulting the plans, I figured out the length of the shaft assembly and cut it to size, then laid out all the parts I thought I'd need:

I first figured out where the mitre gear needed to be, then drilled through it and into the steel shaft to allow the insertion of a roll pin to keep it locked to the shaft:

I had decided to use a knurled steel collar for the drive/friction wheel instead of the wood/emery cloth arrangement specified in the original plans. For the wheel, I went with a knurled microphone base adapter (which measured exactly 18mm in diameter), cut off the threaded end, drilled it out to fit the shaft, and pressed two nylon shaft spacers into the piece.

In order to lock it to the shaft, I drilled a hole partway into the end crank web and inserted a roll pin that would stick out halfway. Then I drilled a corresponding hole into the end of the knurled drive wheel so that the pin would lock the wheel to the end crank (which would lock to the shaft with a set screw).

Here's all the components put together:

It's probably a little more complicated than it needs to be, but once I got started it was almost like playing with legos or tinkertoys...