Home |
Search |
Today's Posts |
|
Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters. |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Opinion wanted on this variable speed option.
I am looking for a little input in case I have missed something. I found
an old J-line bowl lathe and bought it. I am have been looking for a motor to power it. I have looked at a bunch of motors, controllers, AC, DC, 3-phase, single phase etc. I think I have settled on a DC motor largely because of cost. After some searching and a lot of scrap paper math I think I have made my choice. I have found a 1 HP totally enclosed motor, 1725 RPM, sealed unit and rated for continuous duty. It costs more than some of the other DC motors but it seems the better choice in a dusty environment like a lathe. It Having no experience with DC motors I have some concerns about the loss of low speed torque. My plan is to run a variable speed control and since my lathe came with a 3 step pulley on it and I I have decided to use pulleys with a 3", 4" and 5" diameter and a second one with a 1 5/16", 2 9/16" and 3 3/8" dia. That way If I need to I can run the motor at a higher speed and keep the spindle speed down and torque up. On the lowest setting my max. spindle speed would be 455 RPM and I have close to a 4 to 1 multiplication factor in my favor, so even at very slow speeds I should still have plenty of torque. The next step provides for 1120 RPM and a 2 to 3 ratio. The highest setting is almost 1 to 1 and would be way faster than I think I would ever need. While I hope to just set it and not have to change the belt location at least if I find that at slow speeds on larger items that I am lacking torque I have the option to gear it down and speed up the motor. Or have I missed something here? |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
OPTION ARM EXPLAINED: Pay what you want monthly mortgage. | Home Ownership | |||
Option ARM Basic Description: | Home Ownership | |||
OPTION ARM EXPLAINED: Pay what you want each month mortgage. | Home Ownership | |||
Using VFD to power variable speed lathe. | Metalworking | |||
Central A/C cooling fine but humidity seems high | Home Repair |