Or you could just eyeball it and do it by hand like most of the world does it.
I did a calculation to determine how much rotation would be on the tungsten if it were spun against a grinding wheel.
Grinding wheel surface speed in inches per minute > 6 inch wheel, 3450 rpm.
TT X 6" X 3450 rpm = 65031 inches per minute
Tungsten spin drill rotation in degrees per minute > 950 rpm, 360 degrees per revolution.
950 rpm X 360° = 342,000 degrees per minute
Grinding wheel travel per degree of tungsten rotation
65031 "/min ÷ 342,000 °/min = 0.190 inches per degree of tungsten rotation.
So if you are putting a 3 to 1 taper on a 1/16 tungsten you will have only 1 degree of spiral (rotation) on the grind.
Or you could just eyeball it and do it by hand like most of the world does it.
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I had my uncle make me some split collets for my die grinder...12,500 rpm at 90psi...my air pressure is 150 so I honestly figure 14000-15000 rpm
I can't see any spiral angle and seems to work pretty good, just like to do short pieces with the die grinders though
Last edited by MinnesotaDave; 09-22-2016 at 07:09 AM.
Dave J.
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Tried being normal once, didn't take....I think it was a Tuesday.
I want a smaller chuck for short tungsten. How do others solve that? I lay the grinder on its back turning away from me. My brain imagines contamination being pulled off at the point rather than pushed up the shaft. Also I imagine the tungsten kicking through my hand when grinding toward me.
Willie
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Hold it like a dart and aim it at the friend that has to stand over you while you work so when it bites the wheel and takes off its heading towards the friend that likes to bury his nose up your rear while your busy.....
Had one of those friends stop by yesterday and just wasn't in the mood for a lost puppy following me
I took a chuck off a cheap cordless drill that doesn't use a key and like to use it for a holder while sharpening tungsten...just made a free easy to hold piece that won't burn your finger
I use a rather different system....
Picked up most of a Belsaw brand sawblade sharpener at auction a few years ago.
One side has a bed like a disk sander with the grinding wheel poking through it.
Just lay the tungsten on the bed parallel with the rotation of the wheel. Roll it slowly back and forth while gently pushing it onto the wheel. Grind angle is set by how much wheel is above the bed.
Easy, neat, consistent!
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Diamond Ground sells a short collet kit for their Piranha gr. I have it, and it allows me to sharpen very short pieces. They advertise the components as a kit, but they do sell each piece individually:
http://www.diamondground.com/piranha...-upgrade-kits/
-Chris
Dave J.
Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~
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Tried being normal once, didn't take....I think it was a Tuesday.
thats how i roll.
i would say great math to the op, but there is no way im going to double check it!!!!! nice skills there, could have used you today when i had to rotate a staircase that once came up perpendicular to the catwalk, all the way to a few degrees past parallel to a platform that was set prior to considering this. . . . .and maintain tread level, and fix uneven tread heights. . . .
ugh, im disappointed in myself, i caved into the "forget math, lets just cut it up, hang it, and piece it in" mindset of my co-workers. . . . . .rough day
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Yea diamond ground products and some other companies made nice grinders ,pointer ,cutoff combo tools the old drill and belt sander or grinder was what I was taught. May not be the approved way . Most guys also cut the tungsten in half and sharpened both ends of both pieces . any one have a tungsten carrier that they made?
Last edited by gxbxc; 09-22-2016 at 11:52 PM.
lol at holding the tungsten with your hand...
use a cordless drill and actually get it straight and centered in 2-8 seconds.
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You really aren't trying to get a spiral grind on tungsten, so using a drill is counterproductive.
Use you're fingers and rotate slowly. You will have a much more stable arc at low amps than that spirally bull**** ever will
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Old mechanical pencil lead holder works OK on 3/32.
Ernie F.
i use the collet and holder off an old torch..once the heads no good cut the rubber off and viola..a holder to grind tungsten....or the tungsten grinder shown in the video..thats best way
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That's what I do is hold it with my finger a hold the 4.5" grinder "1 handed" and twist the tungsten in my fingers. Grabbing the drill that has to be found takes time, getting the drill bit out of the drill takes time. Chucking up the tungsten takes time. And so does getting it out of the drill takes time. But ends in a nice tungsten
Done for years on shutdowns. All that's needed for pressure welds. Grinder station gets set up in some out of the way area. 1/8th inch tungsten, cut down for short back cap. Modern times would see keyless chuck.
That's why you grind your tungsten all at once. You are already wasting your time sharpening one tungsten as you go. Chucking a tungsten takes all of half a second. I actually just sharpened a bunch of 3/32 this morning. Turned 3 sticks into 12 pieces all sharpened on both ends in about 10 minutes using a battery drill and grinder with diamond blade. Good luck trying to do that in 10 minutes with your fingers.