Jerome Hanby
01-24-2012, 8:53 AM
Want to make sure I'm thinking this through correctly. On the Shopnotes router mill, the router carriage rides on a 1" acme threaded rod. Looks like that size rod is 5 TPI. If I want to cut a 2 TPI V notch spiral on the blank loaded on the mill then the gear on the blank's shaft needs 2.5 times as many teeth as the gear on the acme shaft? So if the acme drive gear has 10 teeth then the blank drive gear needs 25 teeth? And if I need to change the direction of rotation, I add an additional 10 tooth gear between the two?
I'm also seeing that it would be very convenient to be able to change the drive gears. As presented, they are epoxied on to the drive shafts. Do they make a threaded insert small enough for these wooden gears that would allow a set screw to be installed (and a flat filed on the drive shafts)? None of this stuff spins very fast, so balance isn't a big issue, I suppose I could rig up some slot in the gear and shaft and use some type of wedge...
I'm also seeing that it would be very convenient to be able to change the drive gears. As presented, they are epoxied on to the drive shafts. Do they make a threaded insert small enough for these wooden gears that would allow a set screw to be installed (and a flat filed on the drive shafts)? None of this stuff spins very fast, so balance isn't a big issue, I suppose I could rig up some slot in the gear and shaft and use some type of wedge...