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Thread: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

  1. #51
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    It appears yours is not governed. It appears very similar to an old Chicago Pneumatics I have. I know I assembled one wrong at one point and did not align the ports properly, and it ran poorly if at all. If you have time try to work out the allignment or even try different orientations if you are not sure. Also verify that the vanes were indeed changed when it was "rebuilt". A soap test will tell you if the housing is leaking.
    I lived on the west side of Winnipeg, right on the Assiniboine River. Lots of cross country skiing. i live in the tropical Pacific islands now, never going back.
    Last edited by bakodiver; 01-20-2021 at 05:06 PM.

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  3. #52
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Any idea what that weep hole to the front is supposed to do? Let oil move to the gear mechanisms?
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Quote Originally Posted by whtbaron View Post
    Any idea what that weep hole to the front is supposed to do? Let oil move to the gear mechanisms?
    I'm not sure what you mean, but it's probably a fitting to grease the gear train.

  5. #54
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    It's not for grease, I can't see it would even let much air born oil into the gears.... maybe a little into the first bearing. If you look at my middle picture, it's drilled right into the top groove of the motor at the far right... on the splined end going to the gear head.
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  7. #55
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Quote Originally Posted by whtbaron View Post
    It's not for grease, I can't see it would even let much air born oil into the gears.... maybe a little into the first bearing. If you look at my middle picture, it's drilled right into the top groove of the motor at the far right... on the splined end going to the gear head.
    Without seeing the motor firsthand I can only guess.... is it for a pin access or a drill access for a deeper hole inline with it? or could be like you say a weep hole but designed to weep air pressure so it won't exceed pressures in the next chamber if you get too much air bypassing the first seals???

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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    I'm not sure .... the only U tubes I can find are for air impact wrenches and die grinders... and nothing on this old Snap On version. Like I said, it really wasn't what I had expected to find inside.
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  10. #57
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Funny you mention impacts I have an old import 1" inline I ripped apart after it was sitting for a year it had 'froze up' impeller vanes rusted in place... so I cleaned it up put it back together and it worked like yours wouldn't even turn... I was kinda mad at that point so I ordered up a new 4000 ft/lb inline and threw it under a cabinet.... after seeing your post the other day I 'almost' grabbed it to rip into it again but was too beat today to even do anything in the shop so it'll have to wait

  11. #58
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    In 1985 a Snap On dealer was quiting, and he had 3 1/2" impacts he had taken in trade for rebuilding and had never gotten around to it. He said there was enough parts in the 3 to make one good one, and sold them to me for $25. I'm still running on the 2nd rebuild from the original parts.
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  13. #59
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    3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Quote Originally Posted by whtbaron View Post
    In 1985 a Snap On dealer was quiting, and he had 3 1/2" impacts he had taken in trade for rebuilding and had never gotten around to it. He said there was enough parts in the 3 to make one good one, and sold them to me for $25. I'm still running on the 2nd rebuild from the original parts.
    That's about the time where I loaded up on Snap-on stuff that the Feds reimbursed half invoice cost back to the buyer for the METRIC program.

    I got metric punches , chisels etc AND a half priced roll cab cause I needed more storage for my metric stuff.


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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Quote Originally Posted by Lis2323 View Post
    Youíll want to add a drop or two into the air inlet each time you use.

    If you plan to use a dedicated outlet(s)/branch for air tools then you may consider installing an automatic oiler. Just donít hook up your paint pot to it. LOL.




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    Iím not sure I believe thatís your shop in the picture.

    Drops cluttering the floor and sheet goods hastily leaned against a wall and not in a rack.


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  17. #61
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Quote Originally Posted by Mike_L View Post


    Iím not sure I believe thatís your shop in the picture.

    Drops cluttering the floor and sheet goods hastily leaned against a wall and not in a rack.

    Professionally staged to make me look like a real weldor type....


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  19. #62
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Quote Originally Posted by tackit View Post
    Nice tool but I would have to invest in a new air compressor to run one, and my Hitachi's have always answered their call to duty for around $125 a piece. I don't buy air tools because unlike your shop, my much to loud air compressor lives only 10' away from my welding table, and I hate to listen to it turning on and off. Good luck with your cool tool and enjoy using that beauty.
    Thank you. It's so nice, I just bought another one.
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  21. #63
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Quote Originally Posted by Oscar View Post
    Thank you. It's so nice, I just bought another one.
    Geeeeez!!!!! One for each hand I have a hard enough time using one of the big ones with two hands on it

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  23. #64
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Look ma'! Twins!








    Quote Originally Posted by Stick-man View Post
    Also, if you don't mind, where did you purchase and how much?

    Stickman, I hadn't seen the question in your edited post. EBay. $200 for the first one, $300 for the 2nd one. Slightly different models, one is the 28826 which is listed as a cut-off tool, but the only thing I can see different is the guard, it has a full semi-circle enclosing the disc, where as the 28824 (which is listed as a grinding tool) has the more traditional open-area on the underside like most any other grinder guard.
    Last edited by Oscar; 1 Week Ago at 07:02 PM.
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  25. #65
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    I hope moto sees this thread!!
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  27. #66
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Quote Originally Posted by mla2ofus View Post
    I hope moto sees this thread!!
    I'm not following...
    Last edited by Oscar; 1 Week Ago at 07:35 PM.
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  29. #67
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Quote Originally Posted by Oscar View Post
    I'm not following...
    He's looking for a die grinder 90 degree... similar but I think he wants to keep a bit more compact.... and wallet friendly


    Over in this thread ---> https://weldingweb.com/vbb/showthrea...46#post8803746
    Last edited by ronsii; 1 Week Ago at 10:41 PM.

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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    Quote Originally Posted by ronsii View Post
    He's looking for a die grinder 90 degree... similar but I think he wants to keep a bit more compact.... and wallet friendly


    Over in this thread ---> https://weldingweb.com/vbb/showthrea...46#post8803746
    oh ok, I see now. Yea those are quite a bit different. For those I usually buy harbor freight, lol. I do have some of their "Chief" line of air tools, and I have to admit, they are really, really nice! They are ultra, ultra smooth. As smooth as those $1200 3M grinders! Not the same level of power of course, but I was pleasantly surprised. Seem to be made by the same place that makes some of the Northern Tool Klutch air tools (the 4Ĺ" pneumatic angle grinders are identical).
    Last edited by Oscar; 1 Week Ago at 11:10 PM.
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  32. #69
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    Re: 3M 1.5HP Air Grinder - The Rolls Royce of air grinders

    A guy at work has the 4.5” chief and it is smooth but extremely heavy and the throttle will act like it’s sticking even tho it’s not being pressed but the wheel will still spin

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