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Shocks From Grinder

Discussion in 'Grinders' started by donnymac250, Mar 24, 2014.

  1. donnymac250

    donnymac250 Member

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    hello all ,
    i have been getting a ton of shocks from my grinder . i tried to ground the grinder and the motor but still getting shocks . i even got a shock of the motor housing while touching the grinder at the same time . i seem to get most of them while grinding small items when my fingers are very close to the platen . i wondering if its the motor . i opened the motor and did not see any bare or grounded wires . i did see some blackness on a couple places of the windings , could that be the problem ? .so im thinking its has to be a bad ground ? has this happened to anyone else , and does any one have a solution . thanks don
     
  2. dancom

    dancom Dust Maker Best Shop Tool

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    Don,

    Could it be static? I've got a little brass brush almost touching the back of the belt (grinding belt) and connected to the frame. This drains the charge from the belt. Also, I've heard fabric anti-static spray works well.

    One way to check for bad electrical grounding is to connect a voltmeter on AC volts from your receptacle ground to your grinder frame. Should be 0V with the motor running. I am thinking it's static you are feeling.

    Dan
     
  3. Duncan Tipton

    Duncan Tipton New Member

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    I had static issues. I grounded my push stick which is aluminum,and made it go away. Some one told me to spray the inside of my belts with anti static spray, for laundry. They said you will never have a static issue with that belt again. I haven't tried it yet.
     
  4. Duncan Tipton

    Duncan Tipton New Member

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    Dan sorry for not reading you post before replying. You already got that one covered!
     
  5. Grayzer86

    Grayzer86 Active Member

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    Pretty sure it's static. I don't have the issue much with my current grinder, but used to deal with it every day with my 1x30. I found that it was also usually the higher grits giving me the blasts, to the point I could watch the sparks jump from my fingers. I actualy tried a grounding strap for my wrist for a while, which worked. Before anyone panics the strap has multiple light pressure break away points on the lead, as well as several at and on the wrist strap so it would easily pop off it it ever got snagged by something. We use them when working on equipment that has highly static sensitive electronics in it. With that all said, I don't seem to need it any longer so I don't use it on my big grinder.
     
  6. donnymac250

    donnymac250 Member

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    ok thanks guys , will go a try the anti static spray , seems like an easy way to try first . and will get a brass brush and mount it .will metal tape be ok to mount the brush. or will i have to drill through the wood handle and bolt it .
     
  7. dancom

    dancom Dust Maker Best Shop Tool

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    According to a veteran on Knife Network, a shot of anti-static spray on the back of a belt will last the life of the belt. No mention as to what kind, scented or not. ;) Try that first.

    I guess as long as it conducting. Most of those adhesives are not conductive, so make sure some metal is touching metal. Give it a try and once your satisfied with the performance you can make a more permanent solution. I used a plastic handled brass brush from Princess. Looks sort of like a bent toothbrush. I drilled a hole through the brush head and put a small machine screw so that it was touching the brass bristles. Then I cut the handle off. This is mounted to an L bracket that connects to the grinder frame. The bristles do not need to touch the back of the belt. Position them so that they are very close, say 1 to 2 mm away and the charge will be attracted to the points of the bristles (like tiny lightning rods) and drain away to the frame, which (hopefully) is grounded. Big machines such as printing presses use this concept to manage static charges.

    Rubber sole boots + spinning belts + dry air = ZAP!

    Good luck!

    Dan
     
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  8. Rob W

    Rob W Active Member

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  9. dancom

    dancom Dust Maker Best Shop Tool

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    [​IMG]
    FYI :)
     
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  10. donnymac250

    donnymac250 Member

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    well my bench is an old counter top . it is secured to the 2x4s to my shed wall . will that be grounded enough . or will i have to run a wire from the base to the ground on the electrical plug in ? thanks again dan .i will head to p-a to get a brush also . so i can have a dancom super- duper statical dischargenator . tired of feeling like frankenstein with all that electricity going into me .lol
     
  11. dancom

    dancom Dust Maker Best Shop Tool

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    The green wire on your grinder's power cord (starting at the plug end) should:

    1. tie into your switch box
    AND
    2. continue out of the switch box down to the motor
    AND
    3. continue to the grinder frame.
    [​IMG]

    This will give a path for any built up charge to drain away.

    Dan
     
  12. donnymac250

    donnymac250 Member

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    ok thanks again dan.will do , also picked up my dancom discharger brush today .
     
  13. dancom

    dancom Dust Maker Best Shop Tool

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    Awesome. The only reason I put a wire from the motor down to the frame is that there may be rubber mounts on the motor, paint could be thick or what-have-you add resistance to the path.

    Princess Auto has some groovy neck bolts in their surplus area. :eek:
     
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  14. donnymac250

    donnymac250 Member

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    well dan , your brush did not work for me . also attached a wire from the motor wall beside the ground wire , then to a alligator clip then attached that to the bolt thats holds the motor to base .will do the ground check from wall socket to base tomorrow , just have to get my multimeter from rv . then will get some anti static fabric spray if that dont work then .
     
  15. dancom

    dancom Dust Maker Best Shop Tool

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    Don, did you ever get the shocking issue sorted out?

    I've been spinning my new grinder for a few hours and haven't received a shock. Maybe that is because the recent two days of rain ensures that I am standing in a puddle while working. :(

    D
     
  16. donnymac250

    donnymac250 Member

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    some what . the spray seem to help a bit . but every once in a while i still get a shock while grinding bolsters . and still here the odd snap noise coming from the motor area .much better though so far . im no longer sitting there waiting for the shocks to arrive and attack me .i was getting zapped so many that it was driving me crazy just waiting and knowing they were gonna hit any second .
     
  17. dancom

    dancom Dust Maker Best Shop Tool

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    Sounds like it may be a combination of things. Did you use spray like Staticide or Static Guard?

    I am like you when it comes to static shocks. The it's the thought of getting zapped that sometimes hurts more than the shock.

    D
     
  18. donnymac250

    donnymac250 Member

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    ya dan im using static guard .and ya waiting for the shock sucks , its like frying bacon shirt less and waiting for the hot splatter to hit ya .
     
  19. BigUglyMan

    BigUglyMan Active Member

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    The shocks keep me tuned into the barometric pressure. Just like this guy...
    [​IMG]
     
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