To count the turns I picked up a magnetic switch and wrote a Arduino program that would count up every time the switch was closed. I planned on doing more turns than that because my winding would be more random than my mathematical model. I did some math on the coil and decided that I needed about 4500 turns in my coil. Looking at the bad coil I could see that there were an uncountable number of turns in the coil. I looked up the resistance per length of the wire to figure out how much wire would be in the coil. I measured the resistance of the other coil and found it to be 944 ohms.
#What is the electrical voltage for a hardinge hlv h lathe how to#
I also made some drawings of the coil and thought about how to wind it. The wire was 34 gauge magnet wire and I was able to get a spool off of eBay. Sure, I’ve never wound a coil before but it can’t be that hard right?įirst, I took some measurements of the bad coil. Me, being cheap, though about possibly winding the coil myself. One did but said they wanted $250 + parts to fix it. I took the motor around to a couple of motor shops but most didn’t work on motors this small. So, I started trying to figure out how to fix it. Other than the bad coil the rest of the motor looked fine. Electrical contact between the coil and the motor frame will also cause problems as it shorts to ground. As the coil is a continuous wire, any break in the wire means the coil won’t work any more. Here’s a better view of the charred area. Once I opened the motor I quickly found a charred area.
When electricity is connected it generates a magnetic field. A field coil is just a continuous piece of coated wire folded into a bunch of loops. Since I had continuity between the field coils and case I knew that I was looking for some kind of contact between the two.
So, I decided to dig into it and see what was wrong. This isn’t a motor that would be easy to buy a replacement for. The motor is a right angle 240V DC motor that moves the carriage and cross slide. I started checking out the motor a discovered that one of the field motor wires had continuity with the motor’s case. I checked it out with my multimeters and found that the switch worked fine and was reversing the voltage. When I hooked it up previously, I was disturbed to find that the motor only ran in one direction despite the direction switch being changed. This time I’m addressing the feed motor on the carriage.
I’ve finally gotten back to working on the Hardinge.
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