Creative Woodworks & crafts 1998-09, страница 29

SCROLL SAW ARTIST EXTRAORDINAIRE DIRK BOELMAN IS CUTTING A GREAT DEAL FOR YOU!

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The catalog features hundreds of terrific patterns, including Native American, Western-Frontier, Wildlife, and Religious silhouettes, clocks of all

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bushings can tolerate a dry surface. Soon, friction will generate heat, a flat spot will develop, and then you have a problem.

Further examination Check where your blade clamps are attached to the arms (see Fig. 2). See if you can feel the slightest bit of vertical play where they

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collecting nonessential infor-| mation. She's right of course, : but by keeping track of how much time I spend culling, I can determine the proper maintenance schedule for my l|| saw.

V If all else fails, read the < instructions

If your saw has developed a problem, take out your o wner's manual and check to see if you've been following Lhe manufacturer's recommended maintenance instructions. I Perhaps you should have been I applying a lubricant on a iff periodic basis, or making some sort of adjustment. If you haven't, try it now and run I the saw again. If the problem diminishes, you may have bought some time.

If the trouble persists or is only marginally better, go back to the manual and examine the I diagram(s) of the interior workings of the saw. Study | the drive line—that's where the ^ \ rotational motion of the molor S is eventually converted to the ¹ linear motion of Lhe blade. Become familiar with the placement of any joint where the direction of motion changes on the way to the blade clamps (see Fig. 1). These are the places where bushings or sealed bearings are likely to wear out.

September. 1998

The trouble with bearings and bushings

On most saws, only the drive shaft bearings or bushings make a complete rotation. That motion serves to distribute its lubrication. The remainder only make a short back and forth motion (about a quarter turn each way) which does not allow for equal distribution of lubricant.

As you become familiar with the inner workings of your saw, you will see how tension on the blade is transmitted through the drive line. Usually, as tension increases, saw life decreases. The additional force of blade tension will tend to press whatever lubricant is present away from the bearing surface. Neither bearings nor