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Old 06-10-2004, 12:39 PM
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Default 4 1/2" grinder

So I got an el cheapo 4 1/2 inch grinder, in fact I got 3 for $10 off ebay. In the directions it says that I need to change the gear oil every once in a while on it. I oulled the head off, and it is more like grease than it is like oil. Should I just use regular old moly grease, or should I use white grease, or would just shooting it with a little W-D 40 every once in a while be sufficient?
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Old 06-10-2004, 12:54 PM
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I'd put some kind of grease. WD-40 is a water based lubricant and would burn up quickly at the high rpm's that a grinder produces. Everyone I've been into has had that white grease in it ...
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Old 06-10-2004, 01:04 PM
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Put a good quality grease in there, the "oil" is probably a mis-print.
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Old 06-10-2004, 01:51 PM
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I'd imagine the "oil" in the manual/directions is a translation issue.
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Old 06-10-2004, 03:11 PM
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Are you saying that it has something to do rif poor engrish?
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Old 06-10-2004, 03:30 PM
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It's grot nufring do wif mih engrish, I speeks purfrect engrish !
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Old 06-10-2004, 04:48 PM
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Let me see if I heard this right...

The advice was to put about a dollar's worth of grease into a $3 grinder?
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Old 06-10-2004, 04:59 PM
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LOL, well, sure, if you look at it that way it is a little strange, but I have buzzed quite a bit on one of them, and they work pretty darn good. I don't trust their version of grease though, so I am changing it out.

I just wanted to know if it would work to use moly grease, or if I should hit it with white grease.

and I need grease for some other stuff...

lol
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Old 06-10-2004, 05:00 PM
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Gears like the ones in that grinder typically need a real grease rather than a lubricant like funky WD-40 which is really a water displacing compound not intended to be used as a lubricant. That thin stuff will trash your grinder. Many of the white greases are Kaolin based, which is a clay with lubricating properties (it's also used in making Kaopectate, thought you'd always want to know that). Lubriplate is one brand. This is good for low temp applications like garage door opener acme screws, car door hinges, etc.

Other white greases are lithium based and water resistant. These are good for the wheel bearings on Cripthy's boat trailer which gets backed into the swamp frequently.

My favorite all-around grease is Mobil 28, a red colored grease used in the aviation industry for years. It has good high pressure characteristics for heavily loaded spindles, bearings and gears and it also has a wide uesable temp range from -50 to 400 F.

Extreme pressure greases usually contain additives like molybdenum disulfide. That's the black stuff that stains your hands. It's also expensive, mined in Climax CO, and you only get 3 lbs of moly per ton of ore. But I digress.

Shade Tree has a lot of experience with lubricants and I'm sure he can expound even more.
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Old 06-10-2004, 05:16 PM
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Allow me to sum it up, especially for the new people who aren't acquainted with Jack;
Not only "It's grot nufring do wif mih engrish, I speeks purfrect engrish " is Jack emminently equipped to verbally communicate, he's a putcummer gramproger too.

OP, since we're dealing with potential newbys here, lets just advise them to swallow a fistful of Lubriplate when they have the sh!ts. If it don't plug em up, it will lubricate the outflow.

After all, people are coming here to ShopFloorTalk because we are the Xpurtz, and dey wann gudd adivc.
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