One of the key components in the Stain Dipper Machine is the top pulley assembly. It is crucial that it normalizes the unspooling location of the cable so it does not put lateral forces on the slider rod below. To this end, we designed and created 3 components out of UHMW (Ultra High Molecular Weight Polyethylene). It’s a nice plastic to work with, and super tough. It cuts like butter but has a lot of strength too. This is a 10mm hardened shaft with two bearings pressed into the UHMW.
Here is a picture of the 3D model. As you can see I haven’t trimmed the shaft yet.
In my last post I had an image of one of the guides and the slider in the background. The slider is an aluminum extrusion and the guide is 0.75″ thick Oil Filled Nylon. Nylon is resistant to stain and other chemicals we are using as well as having a low friction coefficient.
Here is a close up of the 3D Assembly taken straight from my computer screen.
Here is a photograph taken with my phone of the actual part that has been machined and installed. There is something satisfying about designing something and then making it exactly (within tolerance) to the size and shape you wanted.