Have 3 Bench grinders now, which to use as buffer?

[BikerDad]

I now find myself the owner of three Craftsman Bench Grinders. A relatively recent (i.e. 21st century) Variable Speed 6" unit, a NOS 6" Blockhead, and a well used 1/2hp 7" Blockhead.

Which would best be dedicated to buffing duty?

 

[larryq]

You need to lean in when buffing, so the strongest motor of the three makes sense I'd say.

 

[crab]

I would say the one with adjustable speed, a buffer needs to run slower than a grinder. You shouldn't need to lean into what you're buffing, you're not sanding you're buffing. There are different wheels, rouge, and prep methods. I guess it depends on whether you're after a show polish or just want it shiny.

 

[Davefr]

I would say the one with adjustable speed, a buffer needs to run slower than a grinder. You shouldn't need to lean into what you're buffing, you're not sanding you're buffing. There are different wheels, rouge, and prep methods. I guess it depends on whether you're after a show polish or just want it shiny.

No, that's not accurate.

Buffing speed is measured by LFM (lineal feet/minute) vs RPM.

The factors that determine optimal LFM are the diameter of the wheel, type of compound and material being buffed. There's a "sweet spot" range depending on your task.

I believe Caswell plating has the charts somewhere on their website.

A good buffer has long shafts and lots of power.

CM Block grinder aren't very good buffers because the motor's are large size. Lower profile cylindrical motors give you more versatility.

 

[nine4gmc]

I used a Craftsman grinder before finding a Baldor buffer, use the most powerful one you have and remove the inner/outer guards for easier access. Just make sure you replace the guards if you ever decide to put a grinding wheel back on.

 

[torqueman2002]

I used a Craftsman grinder before finding a Baldor buffer, use the most powerful one you have and remove the inner/outer guards for easier access. Just make sure you replace the guards if you ever decide to put a grinding wheel back on.

Well said, nine!