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This 'feature' came up with my grinder at the Texas meet. The person who brought it up was used to changing belts by depressing the arm without loosening the tool bar, which would be very difficult...

That should work great. 267lbs/in. I wouldn't be surprised if my spring was close to that.

I use a valve spring along with the spring seats on a KMG clone. The spring is much stiffer than 30lbs per inch. I don't think that the rate is very important, though it seems to me that a stiffer...

This is the way I did my layout also. Great minds and all that.

Your going to want to move the tooling arm laterally so that the contact wheel lines up with the drive wheel without a large overhang in the contact wheel shaft.

I used a valve spring along with it's end caps. The throw on the spring is very short but it is a strong spring and works perfectly. I located it very close on the arm to where the tracking pulley is...

This depends on the size and placement of the drive and tracking wheels, in relation to the receiver tube, and the size of your smallest contact wheel. I use a 2" drive wheel and often a 2" contact...

What are the two pieces of large square tubing for?

I used 3/8" x 1-1/2" hot roll flat bar for the box receiver and
1/2" x 1-1/2" for the tension arm. I used 1-1/4" cold roll for the tool arm.
198717

Plus it will really tune up your metric to English conversion skills.:) I spent a lot of time studying that thread, thanks to this same tip from Charlie.

Buy steel first. The wheels are useless without something to mount them on. Getting the steel will allow you to start moving forward.

If your going without the VFD, you are looking for a 1.5 hp, 1725 rpm, single phase, TEFC, motor.