Band Saw Vibration

I've got quite a bit finished on the Atlas 912 Band Saw restoration project.  Lately, I've been working on all the driven components rather than just cosmetic restoration.

I bought new "tires" and installed them onto the wheels.  The new thing is urethane over rubber - they supposedly wear better and work smoother.  The only thing I don't like about them is the pumpkin orange color.  They went on a bit tight, but it was easier than advertised.

I modified the hub from the original roller chain sprocket to fit a large diameter V-belt pulley.  It's nice to be able to use the tools at work for this.  I used the newly acquired CNC mill to drill in a bolt hole pattern.

Then I tapped 1/4-28 fine threads.  I like fine threads because it's easier to tap - - the threads are not as deep.  And the bolt is a slightly larger diameter for more strength.

That hub attaches to the driven spindle shaft, and then I attached my modified V-belt pulley.  The sticker on it shows it's an Allis Chalmers pulley, and it's a bit out true.  While it is concentric, I had no power to straighten the wobble from side to side.  My awesome new Starrett indicator came in handy to show my variance is 0.062 inches.  That might as well be a mile in my world.  I marked the run-out in thousandths of an inch every 15 degrees or so around the perimeter of the pulley.

Here's a close up of that Starrett 196A indicator with it's cantilever rod option in play.  What a great tool.

Regardless of insane pulley wobble, I did install a brand new blade.  It tracks and runs smooth and true on the two wheels.  It should, for new bearings and new tires should make it smooth as silk.

Here's a couple of overall shots of how things stand.

Things to do:
1.  Fix the wobbly pulley, or rather just buy new.
2.  Figure out a better motor mount
3.  Make a center cutout for the table.
4.  Paint the last 2 covers.