Table saw blade/table alignment, bad luck or underlying issue?

[James Legan]

Would appreciate some insight from those that have ventured down the road of aligning a pivot point based cabinet saw or even specifically a Sawstop PCS on what I am seeing.

Scenario: 6mo machine, new, set it up when I first received it but have not had time to use it or even look at alignment until last night. It was off a good 0.01 front to back on the blade from the miter slot (Woodpecker gauge), so I set out to adjust it. Initial alignment performed against the already installed (new) Woodworker II blade which has maybe seen 10 cuts to date. Following instructions I was able to get it within 0.002 front to back on the blade, but with some significant deviation in the blade center (towards gauge). I then started the process of testing two other blades (OEM blade which shipped with the saw as well as an unopened thin kerf blade, also from Forrest. All 3 blade produce significantly different results, both in comparison to each other as well as themselves when rotating 1/4 turn, until returning to starting position. I am fine with chalking this up to me having bad luck on blade manufacturing tolerances and may even have something machined like the old MasterPlate to rule that out but before I do, I took a series of photos and videos demonstrating what I am seeing, hoping someone will either point out something I am overlooking or supporting the working theory that I may need to stay indoors this weekend or at a minimum, stay off any street where a piano is being hoisted.... I would also have to keep an eye out for Acme safes if that was the case. Thank you in advance for any insight.

1: Woodworker II Post alignment, front to back on the blade, showing variance in the blade center over length of travel (https://youtu.be/Q0TVnLKFzTs).

2: Woodworker II Post alignment, gauge in static position (front), blade rotating 360 degrees (https://youtu.be/7jrsOs_EVvE).

3: Woodworker II Post alignment, gauge in static position (rear), blade rotating 360 degrees (https://youtu.be/kBmef6dNwoo).

4: Sawstop OEM Swap blades, alignment check (https://youtu.be/ldRAqBSFJ_s).

5: Sawstop OEM Swap blades, alignment check after 1/4 rotation from #4 (https://youtu.be/Dxo8TSs6uFw).

Blade perpendicular to table:

406614406615

[Ben Zara]

Saw blades may not be perfectly flat. I use a flat plate for set up, I think infinity tools makes it. https://www.infinitytools.com/10-sanding-discs-with-5-8-arbor

[glenn bradley]

True enough about blade plates. They can also be distorted by spoil on the washers or plate during tightening. Regardless, the practice is, for example, to check (and mark) one tooth at the front, measure at that tooth, rotate the tooth to the rear and check in that position. That is your delta.

I am one of those guys that shoots for 'perfect' but, have learned when to stop due to importance of that 'perfection'. If you miter gauge to marked tooth in the front and rear positions is within tolerance, I would move on. There can be a lot more effort expended assuring that the measurements are consistent with the blade beveled.

[James Legan]

Thank you both. I will try the blade rotation method today and report back.