territorialmillworks Posted March 20, 2016 Share Posted March 20, 2016 I have a 25 year old Grizzly lathe that has been worked hard. The motor fried and took some of the control relays with it. DOA... So now I need to wire a replacement motor with the ability to reverse the rotation by means of a transformer/contactor and switch. I've considered using two knife switches for KISS purposes. Any help would be greatly appreciated. Thx , Keith Quote Link to comment Share on other sites More sharing options...
CMS3900 Posted March 21, 2016 Share Posted March 21, 2016 What model is it? Do you have a manual or a wiring schematic for it? What is fried in it? Pretty much anything that could be in that lathe should be available through Grainger or one of the electronics parts houses. Quote Link to comment Share on other sites More sharing options...
rockstar.esq Posted August 23, 2016 Share Posted August 23, 2016 Territorialironworks, So long as you're not controlling the speed of the motor, you could potentially use a reversible motor starter.https://www.superbreakers.net/2601ag2.html?gclid=COe_0KrH2M4CFQataQod6PsMWA I would strongly encourage you to find an electrician to help with this. Here's a schematic that shows how it would be hooked up. http://www.exman.com/rms.html Knife switches are a very bad idea because they are an electrocution, arc, and flash hazard. Quote Link to comment Share on other sites More sharing options...
Kozzy Posted August 23, 2016 Share Posted August 23, 2016 3 wire or 4 wire?..and I assume it's single phase. In any case, there are a lot of diagrams on google images for the basic set-ups. It appears you can also get into a lot of funky variations and "extras" so YMMV. And of course remember it's the internet and Abraham Lincoln once reminded us that not everything you read on the internet is true. Double source or more. Here's a simple one for a 4 wire but you'd need to figure out the relay switching of the leads: Quote Link to comment Share on other sites More sharing options...
BIGGUNDOCTOR Posted August 23, 2016 Share Posted August 23, 2016 Grainger is a great option for researching electric motors and switches. A rotary drum switch would be much safer then knife switches. Quote Link to comment Share on other sites More sharing options...
turbo7 Posted August 24, 2016 Share Posted August 24, 2016 Stay away from knife switchs, absolutely no reason to go with something that prehistoric or downright dangerous. Quote Link to comment Share on other sites More sharing options...
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