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Old 12-10-2013, 05:31 PM   #1
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Default Delta 40-695 blade tension

Hi everyone. I recently upgraded to a Delta 40-695 (clone of Dewalt 788) from a Skil 3335. On the skil, you turned a knob to tension and the Delta has a much more specific tensioning mechanism only allowing certain settings. I ALWAYS tension it as high as it will go on the Delta and wonder if that is normal...it would seem as though your average tension requirement ought to be somewhere in the middle of available settings rather than always as tight as it gets. And perhaps I should really have the blade tighter than I am getting it. Any thoughts would be appreciated :-)
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Old 12-10-2013, 05:56 PM   #2
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I tension my DeWalt as high as it will go. You want to hear a high "plink" when you pluck the blade. If after you tension the blade and still don't get the high plink, release the tension, push down on the upper arm slightly and you will see that there is slack in the blade. Loosen the top thumb screw till the slack is gone then re-tighten the thumb screw, then re-tension.

P.S. There is a coating of oil on most blades to keep them from rusting. After a while, your blades will start slipping in the clamps causing the blades to lose tension.
I always sand the ends of the blades to remove this oil with a folded piece of 220 grit sandpaper.
Dan in So.Ca.

Last edited by dgman; 12-10-2013 at 06:07 PM.
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Old 12-10-2013, 08:01 PM   #3
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Dan, you are right about the DW788. All the way tight. You can tell the minute you touch the wood to the blade if it is ok.
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Old 12-10-2013, 08:13 PM   #4
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I give my blades a little sanding also. It sure does make a difference. Have a great day Fay
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Old 12-10-2013, 09:16 PM   #5
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I feed from the top with my 788, when I put the blade in or change holes , I pull the tension as far as it will go, then release it completely and most of the time I will see slack (a little bow) in the blade , so I un fasten the bottom screw and pull the blade a tad and then fasten it back, then when I pull the tensioner it doesn't go as far as it did the first time .
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