motor bracket pattern for Tru Grit disc sander base

ashwinearl

ashwinearl

Joined
Nov 9, 2006
Messages
521
I'm looking at the Tru Grit Disc sander system. I'm considering getting just the table/disc and looking for motor/vfd separate. This system needs a motor with a bracket on the base. Is there a standard hole pattern for this type of motor or name of the mount? I'm trying to narrow down motor search.

thanks

products-TG92-BASE.jpg
 
The motor is called 56C with FOOT PLATE.

Most motors in motor-VFD packages have them.

For a simple horizontal or vertical disc grinder the Beaumont Metal Works motor mounting plate is simple and easy to bolt on the side of a workbench or grinder table. You can also make one like it yourself from a piece of 1/2" aluminum.

BTW, 3/4HP is pretty much all you need for a disc grinder. I have one at 1/3HP that is hard to stall. VS is far more important than high power.

1668685887775.png
 
looks like the same base as what Pheer is offering with their disc grinder. You might want to give them a shout. It may literally be the same and that Tru-Grit is working with them.
 
Stacy E. Apelt - Bladesmith said:
VS is far more important than high power.
Click to expand...
That is very true for a disk grinder. You might take a look at "Universal Bench Grinder Stand" on Harbor Freight site. For $30 you've got a stand to mount motor on for a horizontal disk grinder. You might have to drill a hole or two in the stand to mount the motor's footplate to, but that's no problem. I find perhaps 90% of my disk grinder use is with the table moved out of the way.
 
A 56C footed may also be referred to as 56HC. The foot is a NEMA standard and will fit that base. It will have slots to bolt to.
 
NEMA is a standardizing organization that sets specs for electrical things.
National Electrical Manufacturers Association (NEMA) is an organization that defines standards used in North America for various grades of electrical equipment and medical imaging products.

It's why your plugs fit into outlets.

Motor Frame size specs will get you plenty of diagrams.

the C face specs are really standardized.

The foot mounts seem to be more varied, but you can ask for specs, measurement hole layout for any motor you buy.
 
I'd rather have a platform that uses the face of the motor (56c bolt hole pattern) instead of the side mount.

From what I see in industrial use, 56c is more common, and it won't limit your options on available motors.......
 
Just for reference, the driver for me towards the Tru grit is their table design where the surface continues back past the disc. This combined with the angled taper on the disc thickness allows detailed work in the back square of a slip joint.

The only other off-the-shelf work rest I have seen that wraps around is the becksarmory DIY kit. Supposedly, there is a legacy work rest for the AMK system that also wraps around. All the other ones, like Beaumont, knife dogs kit, current AMK are just flat to the disc.

I know making a table would not be the hardest thing, but am looking for tool ready to go and not another project.
 
IMHO a rest on a disc grinder is way over rated. I've used a disc for 8 years or so, and have never had or felt the need for a rest. The only time I would think it could come in handy is doing segmented scales, and for that it would be cheaper to just buy a dedicated disc sander from Harbor Freight.
 
Allow me to second the 1800 rpm motor - the vast majority of use tends to be in the <900 RPM range. Only occasionally do I exceed that speed.

As I mentioned before, the rest isn't used all that much - nice having it there when needed, but I do want the rest completely removed from disk rest of time. Looks like that would be difficult to totally remove from the Tru-Grit base.
 
I use my rest on my TG sander with every slipjoint knife.
I have the mitre guide as well that comes in real handy at squaring things up.

The biggest improvement is the Nielson Disc system. It is pricey but I have 5 discs from 100 grit up to a 600 grit rubber backed disc.

I can change discs in a few seconds and saves a lot of time and not having to deal with sticky disc sheets.
 
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