The tachometer came in yesterday. Now, I’m ready to start working on determining the pulley sizes.
I did read, understand and follow all the instructions that came with the my tachometer. After putting the refective sticker on the flywheel of the motor, I was able to determine that the maximum speed of the motor is 6200 RPM’s. That speed is about twice as fast as I need it so my pulley ratio should be around 1:2. I found a pulley calculator online and I have an idea of the sizes I want for the pulleys.
Now we get to the pulleys. I did consider cutting a V shape groove in the drive pulley but I am now oping to put a V pulley on the motor’s flywheel. I found some 3/4” bore pulleys that will work fine so I needed to work on attaching this pulley. I tried to file the built-in pulley on the flywheel but I found that the pulley was winning that battle. So, as most of you would do, I went to Harbor Freight for my free tarp. At HF, a revelation came to me… use my angle grinder to rough out the flywheel and finish it off with a file. I did just that. Here is the results:
I took the flywheel off the motor I planned to use on the lathe and mounted it on the other treadmill motor I have. The grinder worked very well and then disaster struck. I told you in the earlier blog that if you reverse the motor there was a chance the flywheel would come off. It will; especially if you have taken the set screw out. That sucker hit the floor; spinning at an incredible speed. It ran across the shop and into the bathroom hitting the toilet and cracking the base. This is what I envisioned my face looked like as the free flywheel streaked across the floor:
And thinking back, it is exactly what I looked like. 5 minute epoxy. I hope I got it repaired.
The business that sells pulleys will be open in the morning so I’m off to buy pulleys. More tomorrow.
-- The more skilled you are at something, the worse you are at it when someone is watching.