Ron Altier 7,978 Posted January 13 Report Share Posted January 13 (edited) I'm interested in lowering the speed on my mini lathe for applying friction finish evenly with no drip or flying finish. I think this will allow max finish saturation at low rpm and ease application. Then as my friction finish drys, I can speed it up. The minimum speed is 500 rpm at the lowest the speed rheostat and belt configuration. The label on my Jet mini motor shows half horse 60 Hertz and below shows 162 vdc 3 amp. A contradiction of info. Is it a dc motor that gets is source from the speed controller? Edited January 13 by Ron Altier HARO50, FlGatorwood and Cal 1 1 1 Quote Link to post Share on other sites
Larry Buskirk 14,759 Posted January 13 Report Share Posted January 13 You're right Ron, the label is a contradiction. If it's a DC motor it should not have a 60 Hz. rating. HARO50, Cal and FlGatorwood 3 Quote Link to post Share on other sites
Ron Altier 7,978 Posted January 13 Author Report Share Posted January 13 Thank Larry. I figured that is what it was. Do you have any ideas on lowering my speed? FlGatorwood and Cal 2 Quote Link to post Share on other sites
lew 18,747 Posted January 14 Report Share Posted January 14 Lathe model number? Larry Buskirk, FlGatorwood and Cal 3 Quote Link to post Share on other sites
lew 18,747 Posted January 14 Report Share Posted January 14 Looking at the Jet schematic, it appears that it might be a DC motor DuckSoup, FlGatorwood, p_toad and 1 other 4 Quote Link to post Share on other sites
Larry Buskirk 14,759 Posted January 14 Report Share Posted January 14 Very strange they would list a DC motor as single phase 60 Hz. Cal, p_toad and FlGatorwood 3 Quote Link to post Share on other sites
DuckSoup 3,713 Posted January 14 Report Share Posted January 14 I think maybe the single phase 60hz is in reference to the potentiometer. The AC to DC conversion is happening somewhere within the circuit board. Cal, HARO50, FlGatorwood and 1 other 4 Quote Link to post Share on other sites
lew 18,747 Posted January 14 Report Share Posted January 14 Not sure if this is Ron's lathe model, but this one is definitely a DC motor- Cal, p_toad and FlGatorwood 3 Quote Link to post Share on other sites
Larry Buskirk 14,759 Posted January 14 Report Share Posted January 14 Without a complete schematic it is hard to determine if it would be possible to lower the voltages to the motor so speed could be reduced. There has to be some sort of diode rectification to convert the AC to DC. May or may not be possible to change the value of the potentiometer to lower the output voltage. Cal, FlGatorwood and lew 3 Quote Link to post Share on other sites
Gerald 12,198 Posted January 14 Report Share Posted January 14 I have seen people try this before and the AAW Forum has many such Discussions. I think the bottom line is if input voltage is too low it will burn up the windings or something like that. These motors are not designed to be lowered that much due probably to the cost of those windings. So I guess you could say your dog is chasing a blind squirrel. FlGatorwood, Gunny, lew and 1 other 4 Quote Link to post Share on other sites
FlGatorwood 9,677 Posted January 14 Report Share Posted January 14 Is it possible, given what Gerald has just posted, that you can put step pulleys on the shaft and change speeds that way? HARO50, Larry Buskirk and Cal 3 Quote Link to post Share on other sites
Larry Buskirk 14,759 Posted January 14 Report Share Posted January 14 Ron, If this is your lathe the manual states the lowest speed possible is 200 RPM. http://content.jettools.com/assets/manuals/719100_man_EN.pdf FlGatorwood and Cal 2 Quote Link to post Share on other sites
Popular Post lew 18,747 Posted January 15 Popular Post Report Share Posted January 15 Then there might be this method- HARO50, Artie, Larry Buskirk and 3 others 6 Quote Link to post Share on other sites
Popular Post Ron Altier 7,978 Posted January 15 Author Popular Post Report Share Posted January 15 I did locate the model number 1014VS and tomorrow I'll search for the manual Artie, lew, Gunny and 3 others 6 Quote Link to post Share on other sites
RustyFN 1,493 Posted January 15 Report Share Posted January 15 It is already variable speed. Not much more you can do other than change pulleys. Gunny, FlGatorwood, Cal and 1 other 4 Quote Link to post Share on other sites
Popular Post Gunny 56,323 Posted January 15 Popular Post Report Share Posted January 15 HandyDan, Cal, HARO50 and 5 others 8 Quote Link to post Share on other sites
Popular Post Ron Altier 7,978 Posted January 15 Author Popular Post Report Share Posted January 15 Yep I knew it was at its lowest RPM, but thought there may be a trick or work around that someone may know. I did have a gig set up using my variable speed drill like the lathe gadget pictured above. It worked, but I was hoping some would say "Its easy, just do this, add this resistor, etc and you'll have what you want." FlGatorwood, Gunny, HARO50 and 2 others 5 Quote Link to post Share on other sites
Popular Post Gerald 12,198 Posted January 15 Popular Post Report Share Posted January 15 Amazing the answers a problem can produce. That drill gadget is amazing, but I do have a old rotisserie motor. FlGatorwood, HARO50, lew and 3 others 6 Quote Link to post Share on other sites
Popular Post Gunny 56,323 Posted January 15 Popular Post Report Share Posted January 15 20 minutes ago, Gerald said: That drill gadget is amazing, I made one for my Jet 10x12, works great. HARO50, Cal, lew and 2 others 5 Quote Link to post Share on other sites
Artie 9,553 Posted January 15 Report Share Posted January 15 16 hours ago, Gerald said: I have seen people try this before and the AAW Forum has many such Discussions. I think the bottom line is if input voltage is too low it will burn up the windings or something like that. These motors are not designed to be lowered that much due probably to the cost of those windings. So I guess you could say your dog is chasing a blind squirrel. Ohms law. You lower the voltage, you increase the amperage. It’s linear. Amperage is what burns up the wire. FlGatorwood, Cal, HARO50 and 1 other 3 1 Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.