OK I just looked at the video. So I am going to go thru a few things!!
My motor is a 1.5hp with a pulley system. And my belts are moving on all my attachments now. I'll post a video
One is that my motor gets bog down really easy when I'm grinding on my.
First you say you have the 1.5 hp motor! Is it wired for 110-120V or is it wired for 210-220V?? I went with the2hp and it is wired for 210-220V so you may be slightly underpowered. Please let us know how you have the motor wired,120V or 220V??
As for the small wheel attachment I can't help you as I don't have one or have I ever used one!
OK as to the vibration, it is bad! So going to ask a few questions.
Is the whole set-up from KMG??
Have you tried another belt?? I don't really think that is the issue but have seen bad belts that can cause a vibration!!
Do you own a framing square?? When you have the belt on, tensioned and adjusted for tracking, lay the framing square with one leg on the table and use the other leg to square up to pulleys.
Do the pulleys set square at that point?? Also the square will give you a reference point to look at the sanding belt and how it relates to the line-up of the drive pulley, tracking pulley and the 10" grinding wheel! In other words they should all appear square and in-line with one another!! The tracking pulley is the only one that may be cantered slightly!
Is that 10" wheel a KMG wheel??
I have a grizzly that I had pocketed by a machine shop to accept bearings! After it was pocketed I had to re-true. Think a wheel on a vehicle has to be balanced or it will vibrate.
Have you checked each of the wheels without a belt on to see if you can notice any wobble or play??
That vibration could be a bad bearing! I
Speaking of my small wheel attachment that's another problem the belt is shaken all over the place when I use my small wheel attachment.
Since you are having the same problem with the small wheel attachment. That kind of tells me the vibration may be in the bearings at the drive wheel. Since the vibration is there when using the 10" wheel and their when using the small wheel attachment, it almost has to be something that is common to both set-ups!!
Last thing. Have you contacted KMG??
The short video could tell volumes if they can see it! Call their tech support and see what they have to say!!
Andrew, had posted and he has some good points as well!!