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Reply by Gofor

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Posted on Table saw alignment

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Gofor

470 posts in 4292 days


#1 posted 02-03-2011 05:05 AM

First: Validate your technique: Using a machinist scale laying flat on the table and the end square and flush to the fence or edge of miter slot, measure the corner of the selected tooth to the fence. Rotate blade to back and remeasure. If it does not show almost 1/4” difference with the blade at 45 degrees, your technique with the dial indicator is flawed. Any change in the elevation of the dial indicator tip when moved will throw a major discrepancy in your measurement.

If the blade is indeed out, then back off the 45 degree stop so that it is not inducing any stress wracking in the trunnion. Do the same with the 90. If the trunnion is wracked against either stop, your measurements relative to each other are not reliable, as the wracking is in opposite directions. Redo the measurements, setting the blade angle with a wixey guage (Set vertical to the table over the arbor for both measurements) or with a handle piece of a combination square setting against the flat of the blade and over the arbor. Use the machinist scale to validate the dial indicator measurements somewhat. (accuracy with a machinist scale is only about .005”)

If wracking is the problem, forget the stops. You will have to reset the angle by measurement every time you change the bevel. Age and wear have taken their toll. Set them to where they apply no stress when the bevel is achieved.

If it is still out, then shimming the trunnion may or may not help. It depends on if the guides that the trunnion registers on when beveling are worn, mal-machined, or just crudded up with debris. Debris can be cleaned, the others probably cannot be corrected. (Don’t know without seeing the saw)

Good luck.

Go

PS. I noticed this is a right tilt saw and you aligned the blade to the left miter slot. If this is the primary slot in which you use the miter gauge, good on ya. If not, realign to the one you most commonly use. The only reason for aligning the blade to the miter slot is for the use of the miter gauge. Most slots are not exactly parallel. I see many people who have left tilt saws who align their saws to the right slot, because that is where the fence sits, so they then align the fence. They then wonder why the miter gauge seems to be off a smidgeon when they use it in the left slot, which was never referenced in any of the adjustments.

-- Go http://ncwoodworker.net/pp/showgallery.php?cat=500&ppuser=730


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