08 Aug, 2010

3 Phase Motor with Variable Speed Inverter Control.

Posted by: Raynerd In: Boxford Model A Lathe

I`ve stripped off the old single phase motor from the Boxford and all that nasty painted buttons and bell wire. Rather than rewire it, I`m going to replace it with a 3 phase motor and inverter to give me variable speed control and a fresh wiring for the lathe which needed doing anyway! Luckly I had a 3 phase motor from a Boxford shaper which is a direct replacement.

Here is the old single phase motor at the back with the newer 3 phase motor.

I`ve had to re-wire the 3 phase motor from “star” to “delta” or mesh as it calls it on the motor backing plate

When the inverter arrived from Gavin off homeworkshop, I was chuffed with the condition of it but shocked when I found the pendant was just parts and you needed to put them together yourself. OK OK, maybe I`m being greedy but I was kind of expecting it to be built and although a simple circuit, I can imagine some could be a little confused by the build, let alone having the equipment. Anyway, enough on that. I connected it all up which took several hours…I know I know …I didn`t want to blow it up! Oh and of course I had to go to maplin to get a nice green start button :ddb: :ddb:

Why the hell I choose to video this I don`t know…I think we have all seen a variable speed motor running but here you go! For your viewing pleasure, in HD and in 3D!! With extra loud volume!

The only thing I dislike is when you change from rev to fwd, when you make that selection the motor starts. You can then stop and start using the correct button but again when you stop the motor and go to change direction, it kicks the motor back up in the new direction.

I`ve just managed to get in running on the lathe so pictures to follow…

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  • Steve Richardson: Pretty cool stuff! I work with some real talented machinists and they are gonna dig your website!
  • Mike: Hi.where did you purchase the plate from. Been looking for a good stockist. I love your idea and would like to make one for my boxford. Also, sorry
  • Don bath: Thanks for the reply,currently I am making the escape wheel arbour and back cock plate ready for the next phase of testing .Your comments regarding th

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I`ve always wanted to learn more about engineering and electronics and my list of projects both complete and ongoing has been growing over the past few years. I like to document my progress more for my own understanding as much as anything, it helps keep me on track. I hope you can find something of interest to you, my clock building project is my priority but as you can see, I have many other builds I`m working on. Please leave a comment, it is nice to see people are reading!