Can you tell me what kind of grinder this is?

I don't know, but that guy sure did things the hard way. Knife turned out pretty nice considering what he was working with.

Craftsman 2x42 is a good place to start for a small workbench and low budget.
 
yep the Craftsman 2x42 is about $40 cheaper than the 2x36" attachment that guy is using and that doesn't include the cost of motor or disc grinder you would have to have to put the attachment on. The one big advantage to this 2x36 belt grinder attachment would be if you used it on a variable speed disc grinder with a more powerful motor than the Craftman. That would still run you about twice the cost of the Craftsman though if you don't already have the grinder. There's also no work rest and it could sling a knife right at you if you're not careful.
 
Would this be powerful enough to do some serious shaping on some 1/4" steel?

Not really, but neither would the trick tools one. With a good 36 grit ceramic on the craftsman, you could eventually profile and grind a knife out of 1/4 steel. I made 150 knives with my craftsman,, including a bunch out of 3/16. On the other hand, you can stall it out with a little pressure, as there's no real replacement for horsepower. If you want "serious shaping on 1/4" steel", there's nothing small and affordable that will do that without some patience. If you want small and affordable, but a servicable starting grinder, the craftsman's the way to go.
 
The MultiTool grinder in the picture sure runs smoother than mine! I have mine on a Craftsman variable speed bench grinder.
 
The PB Multitool is a bench grinder attachment, so the power is really down to the bench grinder it's mounted on.

On a 3/4 HP (550W) bench grinder, it can be a fairly useful machine. On a 900W (1 1/5th HP) grinder, it can actually shift a pretty significant amount of metal.

A number of us got the 2 x 36 Multitool attachments in a group buy on British Blades 2 or 3 years back. At around a hundred bucks equivalent, they were good value in a market that does not cater well to knifemakers.

There have been a number of "improved" machines built around the Multitools bought in that group buy, with some being adapted to standard motors with a simple adaptor plate. On a variable-speed motor of 1 or 1 1/2 HP (European motor sizing; these are as big as you can go and still have a standard shaft (19mm) that fits the 3/4" bore drive wheel of the multitool) they make an excellent compact grinder.

With a contact wheel mounted directly onto the motor shaft, the Multitool and an adaptor plate can be used to provide a very easy and effective tensioning/tracking system for a surface grinder belt conversion.

If you are comfortable making your own equipment, the Multitool is something that you will be able to repurpose after you have bought/built something better at doing the job you originally bought it for.

Realistically though, if your main concern is having a grinder that will do what you need to do now, it is an expensive way to get a rather low-spec grinder, assuming you have to pay full price.
 
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