I am trying to make a Predicta Holiday Volume/on/off knob out of wood as a prototype for making some reproductions on a 3-D printer (and to use on mine until I find something better). Since I don't have one, I'm having to guess at some of the dimensions and scale based on a few pictures I've seen on the internet. To confirm what I'm found/figured out so far, can someone who has one of these please provide the following measurements in inches and millimeters if possible?
1. length of the shaft up to the bottom of the wide "disc" that has the metal disc embedded in it? 1/2"?
2. diameter of the shaft? 7/16"?
3. diameter of the disk at the end (outside of the plastic)? 1/2"?
4. diameter of the metal disk embedded in the end? 7/16"?
5. Exact or approximate amount of "Teeth" or grooves etched into the edge of the plastic disc on the end? 80?
6. How much of a gap is there (if any) between the bottom of the shaft and the edge of the contrast knob that sticks out the farthest? In other words if you look down from above, directly over the two knobs, how much of a gap is there in their normal positions?
I'm working with a friend who is building a 3-D printer and thought this would be a good first project to test it out and maybe provide a product at a much more reasonable price than the real ones that rarely come up on ebay.
I'm working on how to assemble it the easiest way and how to incorporate the brass colored disc on the front. I have a method for the "blade" that goes in the split shaft that works well on my wood prototype.
Once I get the dimensions, I will model it with some software that will generate the file needed to run on the 3-D printer.
What other colors does this knob come in? I've only seen brown and black?
Are there Predicta models other than the Holiday that use the same size knob?
Pictures are of the prototype I think is close pending getting final measurements.
Thanks
Rick
