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Thread: Another failed G0704 motor controller

  1. #25
    Community Moderator Al_The_Man's Avatar
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    Quote Originally Posted by SgtSpyder View Post
    Got the KBMM-125 this week, going to put in tomorrow. Iíve been looking over the Grizzly wiring diagrams and it doesnít look like they have the tach signal inputted back in too the SCR controller. That was a little surprising, Iíd like to bring the tach signal in to the KBMM-125 but the manual seems to lack some of the info about the sensor. Does anyone have details on the sensor?
    You need a DC tach on the motor, the J2 jumper has to be set for tach and the tach voltage /1k rev should either be 7v or 50v, if between these two then the output has to be tailored with a resistor, the manual shows how.
    You can check the motor with an automotive battery, the motor should spin up and be steady rpm and no excessive current, once up to speed, in both directions.
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    ďLogic will get you from A to B. Imagination will take you everywhere.Ē
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    Couple questions. Were you in high gear or low gear and does your spindle feel like it has too much resistance? Mine was the same way - it would pull 8 amps right off the bat but if I ran it in low for 10 minutes, the bearings would warm up and the no-load draw would go down to 3 or so.

    Sent from my iPhone using Tapatalk



  3. #27
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    Quote Originally Posted by Al_The_Man View Post
    You need a DC tach on the motor, the J2 jumper has to be set for tach and the tach voltage /1k rev should either be 7v or 50v, if between these two then the output has to be tailored with a resistor, the manual shows how.
    You can check the motor with an automotive battery, the motor should spin up and be steady rpm and no excessive current, once up to speed, in both directions.
    Al.
    I wanted to try use the tach signal that the G0704 has on the spindle. I just donít have any info on the signal for the tach sensor or what signal comes out of the little controller it has.

    Quote Originally Posted by mrcodewiz View Post
    Couple questions. Were you in high gear or low gear and does your spindle feel like it has too much resistance? Mine was the same way - it would pull 8 amps right off the bat but if I ran it in low for 10 minutes, the bearings would warm up and the no-load draw would go down to 3 or so.

    Sent from my iPhone using Tapatalk
    I didn't connect the belt to the spindle, its just free spinning.



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    Quote Originally Posted by mrcodewiz View Post
    Couple questions. Were you in high gear or low gear and does your spindle feel like it has too much resistance? Mine was the same way - it would pull 8 amps right off the bat but if I ran it in low for 10 minutes, the bearings would warm up and the no-load draw would go down to 3 or so.
    Are the bearings in your spindle or the motor heating up... I'm assuming the spindle since you referenced it above. Just want to make sure.

    -Dave


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    Quote Originally Posted by RX-Heven View Post
    Are the bearings in your spindle or the motor heating up... I'm assuming the spindle since you referenced it above. Just want to make sure.
    Unrelated to Sgt's problem as I missed that he didn't even have it engaged to anything (that is absolutely not right) but on mine it was the big bearing that is outside the quill sleeve - not the spindle bearing.



  6. #30
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    Well the mill is still not running. Called grizzly to get an ETA on the replacement motor, they said around the beginning of May.
    Picked up a brand new tread mill motor off eBay for 60 bucks. Trying to figure out a way to securely mount it without having the mill running to make parts.
    Maybe its time for duck tape and safety wire.



  7. #31
    Registered Thomasn's Avatar
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    Quote Originally Posted by SgtSpyder View Post
    Well the mill is still not running. Called grizzly to get an ETA on the replacement motor, they said around the beginning of May.
    Picked up a brand new tread mill motor off eBay for 60 bucks. Trying to figure out a way to securely mount it without having the mill running to make parts.
    Maybe its time for duck tape and safety wire.

    I got an email Tuesday saying mine should be in late May. It also said "The new motors and circuits boards should be of an improved design once they arrive from the factory."

    I have too much in this thing to send it back now so I'm just moving forward with the parts of the conversion that do not need a functional mill.



  8. #32
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    Default A Grizzly Motor Quick Fix

    I just received my new G0704 and there are warning labels and an addendum sheet to the manual warning the operator not to run the motor at full RPM for extended periods of time or they will risk burning out the motor.

    How's that for a fix?!?!?!?!?



  9. #33
    Gold Member hoss2006's Avatar
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    Quote Originally Posted by TimGS View Post
    I just received my new G0704 and there are warning labels and an addendum sheet to the manual warning the operator not to run the motor at full RPM for extended periods of time or they will risk burning out the motor.

    How's that for a fix?!?!?!?!?
    They added that warning many months ago long before this new batch of machines with a supposedly new supplier of motors.
    Hoss

    http://www.hossmachine.info - Gosh, you've... really got some nice toys here. - Roy Batty -- http://www.g0704.com - http://www.bf20.com - http://www.g0602.com


  10. #34
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    No matter how you spin the facts the idea of adding the label as some kind of fix to the motor issue is just a big joke. If the motor canít handle the advertised speed then Grizzly needs own up to it and take action. At the beginning of this motor ordeal I was on Grizzlyís side and was sure they would make things right I just needed to be patient. Time has worn away those patients. Donít think Iím going to buy anything else from Grizzly.

    Grizzly didnít say anything to me about going with a different motor supplier. They said they were looking at modifying the ends of the motor and the fan inside so it flowed air a little better. But Iím sure someone else can call them and get a completely different story about the motors.

    What I do know is that my mill motor blew back in March and I still havenít gotten a replacement.



  11. #35
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    Ok in the attempt to add real data to the G0704 motor issues Iím posting some pictures of my old blown motor next to my new motor that I finely received from Grizzly this week. Iíve been told by Grizzly and also read here in a few places that the motors were going to be changed in some way or come from a different supplier.
    They look the same to me except for the labels and part numbers being different. It also looks like theyíve moved the that little POS fan in the motor closer to the vent holes.
    Decide for yourself.

    Old motor on the Left, New motor on the right.










  12. #36
    Registered arizonavideo's Avatar
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    From what I have seen I don't think the motors are not up to the job but some were just defective. Something put too much pressure on the windings and they shorted.

    If they fixed that they should never fail under light to normal use.

    Under max power over a long run things may be different but this is not the kind of failures people have posted about.

    You could drill out the holes in the top motor plate to allow more air in and adding a 120mm fan to the back side of the motor housing cover would be a nice thing too.



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Another failed G0704 motor controller
Another failed G0704 motor controller