The wrong way to test tempering

K

Kim Breed

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Mar 1, 2005
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I was doing the final grinding on a damascus fighter, you know nice and slow. I brought the edge down to where a few strokes on the stone and its sharp. The grinder zapped me and I dropped the blade. After I regained my footing from the hail mary jump so you don't get pinned to the floor move, I heard that tick of point hiting the concrete. That bad feeling came over me as I looked down and saw a large chunck of concrete and a 1/4 inch hole in the floor. I guess I flung it a little, oops. I wiped off the tip to find out that all I did was dull the tip, no curlled over tip. Talk about luck. Will have to charge extra to repair hole in the floor.
Back to the zapping. Is this static electricity or what? and how can I stop it. :mad: :mad:
 
Ground the metallic component you touched when it zapped you. BTW, there was a discussion about this very subject here not long ago (a couple of months perhaps), IIRC the issue was with the ceramic platter on the grinder or something ... perhaps you can look it up or somebody else will remember what it was and chime in.
 
Tryed that. Will have to ground out myself instead. Watch the comments.
It won't fit anyways. :p
 
the problem is you are not grounded to the floor/ or though to it by dry air
you are building the charge within in you and then you touch or come close to a ground then SNAP

try different shoes,, if YOU are insulated from ground you'll get shocked

everyone is grounding everything but them selves from the static electricity
look up the diode method to fix it,( like with computer work)
if you are gounded you can't biuld a charge with-in you..


just in case you get a amp/volt short from the grinder
it self use the diode method

do that so you won't get a lot dead
 
You might try using a "recto-ground". Just hang a chain out of your fanny to the floor.... :eek: :eek: :eek:
 
had the same thing happening, even when i touched the arm of the kmg. I changed shoes and no more zaps.
 
You never want to be grounded to earth ground. It's a good way to insure death if you get attached to a loose wire, a faulty ground on an appliance, etc.
You want a path to ground, yes, but a high resistance (1 megohm or so), to bleed off static charges so they won't build up.
A wrist strap with a resistor to ground will do it, and it won't allow you to fry yourself if you do get hold of line voltage by accident.
 
Roosko said:
You might try using a "recto-ground". Just hang a chain out of your fanny to the floor.... :eek: :eek: :eek:
Click to expand...

This makes me feel foolish because although I have not went to that extreme, believe it or not I have slung a chain over my drill press frame and tucked one end into my waistband. I do a lot of heavy work on swords using the slack belt, this basically turns the blade and the grinder into a big VanDegraff(sp?) generator. On swords it can build up enough of a charge to be rather painful when the little blue lightning bolts fly from your hand to a ground (some of them get out to around 3/4" long :eek: )
 
Kevin R. Cashen said:
This makes me feel foolish because although I have not went to that extreme, believe it or not I have slung a chain over my drill press frame and tucked one end into my waistband. I do a lot of heavy work on swords using the slack belt, this basically turns the blade and the grinder into a big VanDegraff(sp?) generator. On swords it can build up enough of a charge to be rather painful when the little blue lightning bolts fly from your hand to a ground (some of them get out to around 3/4" long :eek: )[/QUOTE
SWEET! you're going to have to show me that next time at your shop !!
I'll take pics !
Click to expand...
 
Howie's got the important info here.USE A 1 MEGOHM RESISTOR ON THE GROUND STRAP.We used to use a wrist strap doing electronics back in the CMOS days.A length of braided coper wire clipped to a good ground (like your grinder if you grounded it properly),an in line 1meg -1 watt resistor,and the end having a piece of cheap light weight link chain (like from a cheap costume necklace) is all you need.Drop the chain in your waist band (on the side or back of your pants) and it will get a good body ground.
Stacy

Note to Mark Williams: Mark ,if you are forging and grinding in the nude again,you will have to find your own attachment point for the ground strap.
 
howiesatwork said:
You never want to be grounded to earth ground. It's a good way to insure death if you get attached to a loose wire, a faulty ground on an appliance, etc.
You want a path to ground, yes, but a high resistance (1 megohm or so), to bleed off static charges so they won't build up.
A wrist strap with a resistor to ground will do it, and it won't allow you to fry yourself if you do get hold of line voltage by accident.
Click to expand...

bleed off static charges so they won't build up. <case and point
static,, lacking the Amp's of household voltage can be bled with wire the thickness of one hair ,, again...
you are grounded to earth by the very means of air it self ,,
at voltages as low as 440 hydro power you do not have to have any ground other than the air it self, don't test this out, you will die ...

static electricity on the other hand is up in the thousands of volts,
BUT less the (killing)Amp's but same volt problem as the 440 , voltage wise not Amp wise,,, you are grounded by moist air hence why there's more of a problem in the winter time, less ground by the air.. you are not bleeding off the Static charge as well therefore it builds in you.

how well you are grounded is the question.. if your equipment is grounded properly you shouldn't have to worry about the power from it ( line voltage).

my grinder is grounded properly and grounded to my full steel grinder bench
thus grounded to the cement floor just by setting on it by means of the steel legs, but I can still get a (Static) shock in the winter depending on the shoes I'm wearing.. I have used a small bead chain to ground myself from
static build up..
just make sure the equipment is grounded better than you are :eek:
the juice will follow the best ground..

remember house currant at 1 Amp and you at "full ground" can kill you
static electricity at thousands of voltage has no harmful Amps (to most people, pace-makers are one of the exceptions I think)
in the case of Lightening it's the heat that kills you.

while you grind the less charge building up in you the less the snap :eek: that snap causing you to drop, drive a blade into the grinder or to throw something is not good..
under the hood of a car grabbing a plug wire is high voltage ele but low DC amp not AC amp big diferance, the smacking the back of your head on the hood pin from the reaction of the shock will hurt you much more than the static shock,,,, ask me how I know :(
 
bladsmth said:
Note to Mark Williams: Mark ,if you are forging and grinding in the nude again,you will have to find your own attachment point for the ground strap.
Click to expand...

I only forge necked, grinding sparks hurt my peepee :D
 
Exactly what Howie said then - ground yourself and use a resistor. You ground yourself now when you touch (actually come very close to, before making any contact) the grinder but since there's no resistor in series the current doesn't "bleed out" slowly and zaps you instead.

The bigger the resistance of the resistor you use the lower the current passing from you to the ground will be, when it's low enough it's not even noticable (but takes proportionally longer to bleed the entire charge off).
 
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