photo credit: becksarmory.com
The base of this project is parts cut from a build your own kit tracking mechanism for a 2 by 72 grinder. Not all the parts seen here will be used, the only addition is an 11-inch piece of square tube 1.5" by 1.5" with a 1/4 inch wall thickness.
Here is the tube steel prior to assembly/welding with the required holes drilled.