Blade alignment

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Forum topic by scvwood27 posted 12-07-2013 06:51 AM 957 views 0 times favorited 6 replies Add to Favorites Watch
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117 posts in 1946 days

12-07-2013 06:51 AM

Trying to align my table saw blade to the miter slots on my Delta contractor saw, but unable to. I loosened all four or my trunion bolts but unable to get the blade to shift over. I am checking the alignment with a dial calibrator. Once the bolts are loose, I am hitting the trunion with a hammer and wood block. I have seen videos in the past and it seems like a tap should so the job. I am hitting harder then a tap and still no movement. Any suggestions?

6 replies so far

View unbob's profile


810 posts in 1898 days

#1 posted 12-07-2013 07:46 AM

On mine, first I remove the motor assembly, makes things easier.
If the four bolts are backed off, you should be able to shake the works, if not, its somehow stuck or has a twist in it. That may require loosening the rod supports to relieve the possible bind between the front and rear trunions, and the mounting holes on the tables bottom.

Once the works will shake when the bolts are loose. I found having one of the front bolts just lightly snug, the works will pivot on that one front lightly tightened bolt. Then using a C clamp at the rear of the saw “easy not too tight” should be able to pull it true, then tighten the other bolts-checking and adjusting along the way.
A good thing I did, was lock-tite studs in the table, and use nuts to hold the works to the table. It has not drifted out of true since.

If none of that works, I would flip the saw on its top, to find out why.

View Skippy906's profile


121 posts in 1982 days

#2 posted 12-07-2013 03:05 PM

In another thread I saw, that the holes needed filed out a little bit to get the trunion bolts to move far enough to be square with the blade. I am thinking the bolts holes on the truinions was what he was referring to. It meant turning the saw over and removing the table all together for this to take place. Worth a try if you cant find out why it wont square up. (shrugs shoulders)

-- Making progress

View ajosephg's profile


1880 posts in 3556 days

#3 posted 12-07-2013 03:09 PM

If it won’t move at all the trunnion mounting washers may have dished/deformed into the trunnion slots. Replace them (one at a time).

If it will move, but not far enough in the desired direction, you will have to flip it on its back, take it apart and length the trunnion slots with a file.

-- Joe

View knotscott's profile


8008 posts in 3371 days

#4 posted 12-07-2013 03:43 PM

Great suggestions above. It’s definitely more work, but tipping the saw upside down can you give a better look at what’s going on if nothing else is working. You may find damaged hardware or trunnion bracket holes that need to be elongated.

It’s even possible that the connecting rods between the trunnion brackets are slighted twisted. To check that you’ll need a flat plate wide enough to lay across the rods. A plate of glass or ceramic floor tile work well. If the plate rocks, the trunnions are twisted. Loosen the rear nuts on the rods and move the rear trunnion so the plate sits flat on the rods. Be careful not to twist the trunnion out of alignment again when retightening, but be sure they’re very snug.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

View scvwood27's profile


117 posts in 1946 days

#5 posted 12-07-2013 05:26 PM

Thanks guys, sounds complicated. I will give it a try. I fairly new at this and would hate to really mess things up. Has anybody ever heard of a home table saw service, where somebody will come to your house to fix / service saws. I called my local Rockler and they said they did not know of any type of service.

View SCOTSMAN's profile


5849 posts in 3580 days

#6 posted 12-07-2013 07:14 PM

If your so unsure watch some videos on youtube. There are many ,and or read some books.Whilst it is not rocket science I agree with your cautious approach your obviously a clever man and not willing to rush ahead without a complete knowledge of the workings of the saw.
I did mine as I bought a new massive sixteen inch blade saw with a sliding table around 700 killo’s .
It just fit when completely dismantled down to the last bolts throught the doorway as said in tiny but heavy pieces.Puting it all back together was not really difficult as I marked and video’d it beforehand just to check Have fun but rightly keep it safe brother. Alistair

-- excuse my typing as I have a form of parkinsons disease

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