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

[12V71]

I like Parker Push-Lok fittings and hose for whips, no clamps or crimp sleeves. I have them on all my air tools.

[Lis2323]

I'm a swivel and whip type...





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[Oscar]

quadruplets!

[Sberry]

Those are super nice. As much as I like them for grinding we use electric on 4 1/2 hard wheel. I do use right angle for cut off and 4 inch wire wheel. They allow for feathering the power. I likely toss the handles in the box where they are in the way for the next decade. I should get along reach 90 like Lis has, had one and wore it out but,,,, I really am not jammed up so much any more. Should have one more straight for pencil type brush.
I have an older IR (I need a chuck collet for,,, I going to get a pic and see if someone has it in a box.
I kind of suspect at some point those 4 hoses will turn in to one with a connector at the tool.

[Sberry]

I also use a heavy 74 cfm connector. They make easier now days and would change cept for I have so much stuff and fairly elaborate system. I dont use anything but a straight, I can somehow seem to manage but its not my first spin with these tools either. The automotive back in the day was kind of limited and the H I use works on 3/4 drive and 1/2 hose too. I see the ratings on more compact and easier to use fittings is really hi now. While its nice in theory doesnt mean a lot in this class of tool.

[Sberry]

In our type of shop settings a connector doesnt hurt a tool much. Especially where a well designed system only requires 1 at the tool. I was on a power plant with lots of air grind and the hoes were random, just find an air hose near and T in. Never really knew where they came and went and could have lots of splices so they used a big connector with this type of tool.

[Oscar]

Quintuplets!

[smithdoor]

Looks great set of grinders.

Dave

Quintuplets!

[whtbaron]

So now you need a custom made glove that would allow you to hold a grinder with each finger... the Edward Scissorhands of the grinder world...

[smithdoor]

My finish is 24 grit .
I did one time buy 36 grit and it was to slow 🐌.

I think 16 grit would be faster but finish would look ruff .

If some said I want finder finish no problem you need hire a painter that is his job.

Dave

So now you need a custom made glove that would allow you to hold a grinder with each finger... the Edward Scissorhands of the grinder world...

[ToolFanGeoff]

Oscar, that is a very fine brood of Quints you have there!
As a fellow grinder fan, could you share your grinder disk logic?
I am guessing you have five tethered for a reason.
Like Lis2323 I keep several at my bench(es). different sizes, 2" to 9" diameter.
Different power - battery, corded, Air.
Different attachments, wire wheel - knotted, cup, straight wire..
Hard grinding disks of different grits and materials. Flap disks of different grits. Sanding disks of different grits with different stiffness backing pads.
Drum sanding attachments... I live a lot of chaos with my grinders.
Oscar, you put a lot of thought into your tools, what are your thoughts?
Anyone else have some insight?

Thank you, and I hope this is not too far off topic.
When you upgrade your compressor, let us know what you did - I am still interested.
Geoff

[Oscar]

Oscar, that is a very fine brood of Quints you have there!
As a fellow grinder fan, could you share your grinder disk logic?
I am guessing you have five tethered for a reason.
Like Lis2323 I keep several at my bench(es). different sizes, 2" to 9" diameter.
Different power - battery, corded, Air.
Different attachments, wire wheel - knotted, cup, straight wire..
Hard grinding disks of different grits and materials. Flap disks of different grits. Sanding disks of different grits with different stiffness backing pads.
Drum sanding attachments... I live a lot of chaos with my grinders.
Oscar, you put a lot of thought into your tools, what are your thoughts?
Anyone else have some insight?

Thank you, and I hope this is not too far off topic.
When you upgrade your compressor, let us know what you did - I am still interested.
Geoff

Geoff,

Such deep and profound questions you ask. It's all good.

Well I think it's obvious that I really liked the 1st 3M grinder, hence why he had to get siblings to play with. My grinder logic for that quintuplet set is as follows: I asked myself which abrasives/attachments I use most. In no particular order:

• ¼" hard grinding disc
• flap disc
• cut off wheel
• ⅛" grinding disc
• knotted wire wheel

I do use a small, I think it's 3", cup knotted wheel, but not so much that I would need it on one permanently (I have it on one of my cheapie Ryobi swivel rat-tail corded grinders). Although, I have been using the flat fiber discs 987c's with backing pads more and more often, so I will end up putting on that attachment to another 3M grinder (there's two more that I have that are not pictured here yet ) I do have drum sanding attachments, small cut-off wheels, file belt sanders, and such, but I have those on other die grinders that I bought before I discovered the awesomeness of the 3M stuff. I think eventually I'll replace most of my stuff with the heavy duty 3M counterpart if I can find them at a decent price pre-owned. As for my compressor, I don't think I want to decommission my current set-up yet. I've got nearly 50 CFM available for minimal investment. If I do ever upgrade, I'm thinking I will simply buy a 7.5HP variable-speed rotary-screw cabinet to add onto my current Polar Air compressor. Speaking of compressors, I need to order a soft-starter for mine. I think it will reduced operating costs a little bit; kick-starting a 10HP 1-phase motor eats up juice!

[Sberry]

You cant throttle it down for a 3 to keep up, it will simply keep running lower and lower. You could throttle it to last longer from a charge.

[Oscar]

I promise these are the last two!


Even though they're in pretty good shape, I removed the push-lock buttons and put in a few drops (3-4) of Amsoil 75w-140 gear oil in there to not have to worry about it later on.

[ToolFanGeoff]

Septuplets!
Congratulations. Fiber reinforced sanding discs? Different grits?
Back up to the back up?
Just curious...

[Oscar]

Yep pretty much. I only use 36 grit for the 3M fibre discs 987c though, so I'm just picking all sorts of stuff up before this inflation thing gets any worse. I kinda regret not deciding on adding more airflow, even though I don't need it. I still don't know what to put on the Seventh Son of a Seventh Son (my Iron Maiden nickname for the one that doesn't have anything on it).