THE TOOL GRINDER

If you need to do tool making in the shop, you will need a tool post grinder. It is a simple matter to make
a small grinder for small tools. You will have to do a little looking around in some appliance shops to find
a motor that will run at a speed of 15,000 to 20,000 RPM. You can also find new high-speed electric
motors sold by W.W. Granger. Most large cities have a store, or an appliance store will be able to give
you an address of the nearest store.

Most vacuum cleaner motors will run at this speed. It will require a bit of work to cut down the housing to
be able to make one work.

There are several types of small motors that will run at this speed, and they will mount directly to the
base with very little alternations.

The bearing housing is made from a piece of mild steel shafting, bored and turned as indicated. You
might be able to find a ready built mandrel from some bearing supply business, or a tool supplier. This
piece cannot be held in a chuck while boring, as it projects too far out. Hold the head end in the
three-jaw chuck and support the tail end in the steady rest. This means that the ends must be centered
and the outside finished before you bore and finish the inside.

The recess for the bearings should be a good push fit on the outer races.

The pulleys are made from mild steel. Since it is desired to use a flat belt, they should have a crown