I have an old Sears Contractor saw circa 1955 that I've been using trouble
free for many years. I have a WWII blade with stiffener and a link belt,
etc. All has been well in woodcuttingland. Then - I decided to cut an
additional zero clearance insert for a thicker blade that I use
occasionally. All I did was remove the WWII and the balance plate, remove
the old ZCI, install the new blade without the balancer and slowly raise the
blade through the ZCI. All was well.
Reversed the procedure so I had the WWII and balancer installed. Fired up
the saw and gat one helluva vibration. Seems the link belt was vibrating
pretty badly. Thought that by raising the blade to full height to cut the
ZCI, I might have stretched the link belt ( do they stretch?) so I removed a
link and tried again. Same problem - I can see and feel the link belt
bouncing. Usually I just leave the weight of the big motor to keep the belt
taught but something isn't right. I'll try removing additional links but
wondered if anyone has run into this before. AS I said, prior to my ZCI
cutting, the saw hummed.
Of course, I may be wrong, I thought I was wrong once but I was mistaken.