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HELP!!! I think my speed controller on my mini lathe died! HELP!!!

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Forum topic by RetiredCoastie posted 12-24-2010 06:58 AM 2215 views 0 times favorited 6 replies Add to Favorites Watch
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RetiredCoastie

999 posts in 1934 days


12-24-2010 06:58 AM

I have a jet mini lathe model # JML-1014VS. I was turning today and my lathe all of a sudden went into warp drive. Do any of you folks know if it’s the circuit board or maybe the potentiometer (rheostat)? Will I have to replace the control assembly? If I run this without the controller working on the low belt settings will this damage the motor? I was right in the middle of finishing up some Christmas gifts when this happened. The lathe still runs at a lower speed if I move the belt to the lowest setting.

If anyone can help I would sure appreciate it.

-- www.thepatriotwoodworker.com Proud Supporter of Homes For Our Troops


6 replies so far

View TopamaxSurvivor's profile

TopamaxSurvivor

15088 posts in 2427 days


#1 posted 12-24-2010 08:31 AM

I don’t know anything about yiour mini jet but running it shoiuld not hurt the motor. You can feel it once in a while. If it is too hot to leave you hand on it, it is probably getting too hot.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View EEngineer's profile

EEngineer

906 posts in 2364 days


#2 posted 12-24-2010 03:52 PM

I worked on one variable speed drive for a friend’s lathe. That one was a DC drive with a PWM output for the motor. The pass transistor had failed shorted. This is really no different than running with the pot set to 100% on the speed control so, no, you shouldn’t damage the motor by running in this condition.

The pass transistor gets the most stress and is what usually fails. If you know someone with electronics experience, the fix is simple and cheap. If not, you are going to need a new circuit board, most likely not the pot.

Topamax had good advice, just check the motor once in a while to make sure it isn’t getting too hot.

-- "Find out what you cannot do and then go do it!"

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hairy

2109 posts in 2283 days


#3 posted 12-24-2010 04:39 PM

I had that same problem with my Jet 1220VS. If you bought it new, warranty will cover the repairs. When I called customer service, I was asked if I wanted to do the repairs myself, or have it done. I did it myself.

I believe the controls for your lathe are the same as for mine.

The biggest problem is getting the wiring out of your way, to get to the board. The on/off switch and speed control are held on with nuts. The wiring and circuit breaker are attached with plastic clips. That’s the problem. Those clips are usually considered one time use. They can be coaxed apart and put back on, if you have the patience.

You will have to separate the pc board from the heat sink;aggravating, but doable. I did have an issue with the blue and white wires. The connectors on the new board did not match the old board. It a simple replacement.

I worked on things such as this for 39 years before I retired. It took me about 2 hours to change the board, with the majority of it spent on those #$%$&**ing plastic connectors.

Open the box, look it over and decide for yourself. It is a PITA, but not impossible. It did fix the problem.

-- in the confusion, I mighta grabbed the gold ...

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RetiredCoastie

999 posts in 1934 days


#4 posted 12-24-2010 08:59 PM

Thanks all for your responses. Hairy you are correct this is the same speed controller that is on mine and thanks for the tips. My lathe is out of warranty. Ive had it sense 2004 so I’ll be footing the bill on this one
Topomax and EEngineer thanks for your input as well, I have some folks in our Avionics shop that should be able to swap out the components. The one thing I don’t understand is my lathe was already at the highest speed that it normally runs at with the rheostat on max and the belt set to the highest pulley arrangement when the speed controller malfunctioned, and the motor went way higher than normal max. Scary fast, It was running so fast that the lathe started to slide off of the stand before I shut it off. Does the controller govern the motor lower than the motors rated capability? If not then why would it over-speed? Thanks Guys and have a Merry Christmas!

-- www.thepatriotwoodworker.com Proud Supporter of Homes For Our Troops

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EEngineer

906 posts in 2364 days


#5 posted 12-25-2010 01:55 AM

Whoa! Now that’s a horse of a different color. Be aware the speed controller I repaired was not a Jet – it was a cheap Chiwanese import and I didn’t think very much of the overall design.

Based on your further comments, I would have to say that running the unit without repairing it is not a good idea.

-- "Find out what you cannot do and then go do it!"

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TopamaxSurvivor

15088 posts in 2427 days


#6 posted 12-25-2010 02:32 AM

That sounds like a DC motor with out a field!! I would think small motors like a mini-late would be series wound if they were DC. I assumed you had a small universal motor running on AC. Anytime you have a motor that seems to be going way over speed, shut it down before it comes apart!! Even a little one will be ugly if that happens ;-((

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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