dnalot
Project of the Month Winner !!!
Sorry guys but this is my last post for the year.
Took the time to fix my rotary table. Almost no backlash, what a difference that makes. The small gearbox is mostly just a repeat of the big one. Also made the five bearings for the camshaft and three bearings for the small gear box. And a roughed out blank for the camshaft. The photo of the camshaft shows it being marked for the layout. for cutting I kept most of the shaft in the collet to start with and would work near the chuck. As I completed a section I would expose anther inch or so until all the detail was cut.
Time to make some gears now. It has been a while sense I cut any gears. This time I have the hardware to make it easier. I have an indexer with a stepper motor and a controller.
See https://www.homemodelenginemachinis...y-table-for-dummies.26744/page-18#post-331050
I made my setup near the beginning of this thread. You can see my setup at post 53. I have used it a lot and it works very well. Well except for gears that is. The limiting factor is that the number of teeth must divide into 360 with no more than 2 decimal places. If there are more than two there will be an error that will accumulate. I needed a 32 tooth gear and that was no problem the indexer worked great. But I Also needed a 64 tooth gear. 360 divided by 64 gives you 5.625 degrees per tooth. The indexer would round that to 5.63, and that will leave you with a very skinny 64th tooth. To get around this I first made 32 cuts. next I would setup for 64 cuts but only made one cut before resetting for 32 cuts. That gives a serviceable gear with every other tooth being a little fat and the others a bit skinny.
Everything fit together nicely and turns smoothly.
Mark T
Took the time to fix my rotary table. Almost no backlash, what a difference that makes. The small gearbox is mostly just a repeat of the big one. Also made the five bearings for the camshaft and three bearings for the small gear box. And a roughed out blank for the camshaft. The photo of the camshaft shows it being marked for the layout. for cutting I kept most of the shaft in the collet to start with and would work near the chuck. As I completed a section I would expose anther inch or so until all the detail was cut.
Time to make some gears now. It has been a while sense I cut any gears. This time I have the hardware to make it easier. I have an indexer with a stepper motor and a controller.
See https://www.homemodelenginemachinis...y-table-for-dummies.26744/page-18#post-331050
I made my setup near the beginning of this thread. You can see my setup at post 53. I have used it a lot and it works very well. Well except for gears that is. The limiting factor is that the number of teeth must divide into 360 with no more than 2 decimal places. If there are more than two there will be an error that will accumulate. I needed a 32 tooth gear and that was no problem the indexer worked great. But I Also needed a 64 tooth gear. 360 divided by 64 gives you 5.625 degrees per tooth. The indexer would round that to 5.63, and that will leave you with a very skinny 64th tooth. To get around this I first made 32 cuts. next I would setup for 64 cuts but only made one cut before resetting for 32 cuts. That gives a serviceable gear with every other tooth being a little fat and the others a bit skinny.
Everything fit together nicely and turns smoothly.
Mark T
