- Joined
- May 20, 2013
- Messages
- 390
I've seen a couple different sets of plans that could be bought to build a belt drive conversion. I decided to try my hand and designing and building my own. I purchased some XL series timing pulleys and a belt from Econobelt to work with. The driven pulley for the spindle is a 36 tooth metric bore (8mm) with a 45 mm hub. That works out to be the same diameter as the G0704 spindle, which simplifies mounting the tach wheel. The driven pulley is machined to fit over the end of the spindle in place of the tach wheel and is mounted by the same holes that held the tach wheel in place. I'll either draw this up or post more detailed dimensions once I get a little farther. Here is what i have so far.
Here are the parts that I started with. The largest one is the 36 tooth pulley. The other three are pulleys that I intend to select a drive pulley for the motor from. The black ones are 25 and 27 tooth nylon with aluminum hubs and 10mm bore, which is very close to the motor shaft size. The flanged aluminum is a 25 tooth with an 8mm bore that i would need to bore out.
These three views just show the un-machined pulley with the tach wheel sitting on the hub - since it is the same diameter as the top of the spindle, it will need no further machining.
These views show the enlarged bore of the pulley (to clear the drawbar), the recess to center the pulley on the spindle (bored into the flat side of the pulley), the shortened hub, and the mounting holes drilled to match the holes in the spindle and the tach wheel. They also show how the tach wheel and pickup will sit on the new pulley.
Here are the pulley and tach wheel mounted in place on the spindle. I bored the recess that sits over the spindle to a nice snug fit so that it transfers any side force tot eh spindle directly instead of to the two 3mm socket head cap screws. Out of time right now, so I'll post more later.
Here are the parts that I started with. The largest one is the 36 tooth pulley. The other three are pulleys that I intend to select a drive pulley for the motor from. The black ones are 25 and 27 tooth nylon with aluminum hubs and 10mm bore, which is very close to the motor shaft size. The flanged aluminum is a 25 tooth with an 8mm bore that i would need to bore out.
These three views just show the un-machined pulley with the tach wheel sitting on the hub - since it is the same diameter as the top of the spindle, it will need no further machining.
These views show the enlarged bore of the pulley (to clear the drawbar), the recess to center the pulley on the spindle (bored into the flat side of the pulley), the shortened hub, and the mounting holes drilled to match the holes in the spindle and the tach wheel. They also show how the tach wheel and pickup will sit on the new pulley.
Here are the pulley and tach wheel mounted in place on the spindle. I bored the recess that sits over the spindle to a nice snug fit so that it transfers any side force tot eh spindle directly instead of to the two 3mm socket head cap screws. Out of time right now, so I'll post more later.