Question about Saws
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Posted on Jan 02, 2017
SOURCE: Porta Band saw blade jumps off
I had this problem on a used model 725 that I bought. Apparently the rubber tires on the drive wheels develop a bit of a memory after sitting for a while with tension on the blade. I tried cleaning the tires to no avail. Then I removed both tires, flipped them over and re-installed. Still not fixed. Then I put only one back to the original position and the problem was solved. Other than the frustration of trying several times, I was out nothing and I got quite proficient at taking the blade in and out. The saw has worked fine ever since. I hope this simple (and free) solution works for you.
Posted on Jan 12, 2009
SOURCE: Band Saw Blade won't stay on
A lot of the larger band saws, and I don't know about your particular model, has an ajustment on the bottom wheel that tilts the wheel in order to track the blade. It is right at the axle and tilts it from there. If the back guide is a roller bearing I woud think you would want to roll all of the time. If a solid bearing block natually a small space where it will not hit is enough.
Posted on Jan 18, 2009
Does it look like this? Unfortunately, they don't have a manual that I could find. But you might like to post your request in the forums there, as they get some traffic from aficionados of old tools with wile and know how.
It might help you also to google Dunlap & PowerKing for the manual.
As far as tuning it up goes...
Check each of the wheels' "bearings" to begin with, to ensure they are running smoothly and as true as possible, without end play or wobble. Then use straightedges and flat jointed boards to line up the three pulleys as much in a single flat plane as possible, by shifting shims, etc. (It may behoove you to remove the table out of the picture to begin with, if possible, so you can get the wheels lined up well with one another, then replace the table once the blade will track.)
The adjustments on a three wheel system can be a little more delicate and temperamental than on a standard 14" bandsaw, so be moderate in your tracking adjustments, and crank the wheels by hand to begin with as you work the tension up on the blade, checking constantly to keep the blade running as close to the center of all three tires as possible. Don't worry about the blade guides at all until you get the blade running on the wheels well. Then move the backed off guide blocks and backing bearings into place. They are meant, after all, to keep the blade from deflecting, not to force it into position.
That's my quick advice for how to tune it up.
Good luck. It looks like a beaut!
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Posted on Sep 03, 2009
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