My Rockwell/Beaver band saw needs attention
I was cutting a straight line in some 3/4" ply with my bandsaw yesterday, when it began to make some thumping noises from inside. I finished the cut I was making, but came back to the saw later and made another small cut, when the machine thumped a couple more times, then jammed, and the fuse blew. SO, I quit for the night, and came back to it today. I took the covers off, looked around for anything that could have caused the saw to jam without finding anything.
Next, I tried to move the wheels by hand and found them very stiff. I was able to rotate them backwards, however and in a while that freed up the wheels to where I could run the saw without any thumping. As I have taken off the table and the covers, I didn't try to cut anything. The thumping stopped after I removed the lower blade guide, and one of the guide blocks looked pretty beat up.I've turned the blocks around, but I haven't reinstalled the guide, for reasons I will go into below.I vacuumed out any sawdust and crap that was lying around in the saw case, and ran the saw for a few secods to make sure it is running like a new saw at the moment. There is no apparent damage to either of my blades, BTW, in spite of the condition of the block. I am pretty sure I reset the blocks, and certain that I adjusted the lower guide when I installed the 3/8" blade. I was using a 3/16" yesterday and I don't think I moved it when I put the 3/16" blade in.
So, I am wondering if any part of that could have caused the thumping that I heard, or been related to the reason the saw jammed.
Some more details. The lower guide block, when I set up the 3/8" blade a year ago, only just reached the back of the blade and it was as far forward as it would go. I adjusted the blade on the upper wheel and came up with a compromise between having the blade run between the blocks, and cutting at a 45º angle because of the blade drift. The upper guide is OK for position and gap. When I installed the 3/16" blade, the blade actually sat forward of the lower guide, and I couldn't move it, so I left it alone. It has done a fair bit of cutting with this blade since I put it in so I didn't worry much.
Next, if you look at the photos below, you will see that the blade runs about the centre of the upper wheel, but within ¼" of the front of the lower wheel. With the 3/8" blade in place, the blade was almost on the edge of the lower wheel. This will be an issue if I try to put a ½" blade on it, and I want to do some resawing. So, what do I need to adjust, and how, to get the blade in the right position on the lower wheel?
Thank you in advance for your experience, perspicacity and erudition.
Last edited by Roger Tulk; 05-10-2012 at 04:01 AM.
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