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Table saw blade moves out of alignment

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Forum topic by Woodhed posted 11-27-2011 02:40 AM 3048 views 0 times favorited 4 replies Add to Favorites Watch
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Woodhed

2 posts in 1834 days


11-27-2011 02:40 AM

Topic tags/keywords: tablesaw question

Hi all,

I fine tuned my Delta (36-714) table saw according to John White’s book, “Care and Repair of Shop Machines: A Complete Guide to Setup, Troubleshooting, and Maintenance”. I used a Master Plate instead of a piece of plywood.

I brought the arbor up all the way and then back down about a 1/4 inch. Squared the master plate against the miter slot by loosening the trunnion bolts, re-tightening the bolts and rechecking as I go. I then squared the miter gauge to the plate & squared the fence to the miter slot.

So far so good. I put my brand new blade on and then lower the arbor to cutting height. I rip and cut two boards to the same dimensions about 6 X 8”. I hold them together flush on their ends and then turn one around left to right to see if they are square to one another.

They’re not.

It seems that square is true at the position of the arbor when fine tuning but as soon as I raise or lower the blade, the alignment has changed. Does anyone know why the blade would not be parallel to the miter slot at different arbor positions?

Thanks to all replies.

Woodhed

-- Woodhed, Miami, FL


4 replies so far

View ajosephg's profile

ajosephg

1878 posts in 3021 days


#1 posted 11-27-2011 06:16 AM

The trunnion mounting bosses on the bottom of the table are probably not co-plane with each other. The low one/s will need to be shimmed between the boss and the trunnion.

Another common problem is that the trunnion bars are not parallel with each other.

Edit: Also, you should make the alignment adjustments with the belt on.

-- Joe

View IrreverentJack's profile

IrreverentJack

724 posts in 2303 days


#2 posted 11-27-2011 06:53 AM

Hi Woodhed, Your saw is a hybrid. Check if the brackets (that hold the trunnions) are flush with the bottom of the saw top. You might have caught something between them when you adjusted it. Never read John White and I can’t imagine how using a Master Plate wouldn’t introduce all kinds of inaccuracies over just putting a spot on your blade and rotating it. That said, Matthias Wandel at WoodGears.ca owns a Delta Hybrid and has posted on it. I feel TableSawAlignment.com is well worth the registering hassle. I also recommend Ed Bennett's TS Aligner Jr but it might be very frustrating to try and get one. Good luck. -Jack

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ajosephg

1878 posts in 3021 days


#3 posted 11-27-2011 11:56 AM

Woodhed – I didn’t realize your’s was a hybrid, so what I said may not be true. In any case what Jack said about TableSawAlignment.com is spot on.

Probably you can’t buy any of Bennett’s products, but his methodology is correct.

-- Joe

View IrreverentJack's profile

IrreverentJack

724 posts in 2303 days


#4 posted 11-27-2011 04:00 PM

I used a Master Plate instead of a piece of plywood.

Woodhed, I’m puzzled. Having your boards be off like that is probably due to your miter gauge and blade angle not being at 90 degrees. Like Joe said, having the blade alignment change when the blade height changes is a (non) coplanar issue. Blade alignment is on two planes, vertically parallel to the miter slot and horizontally with the surface of the top. Aligning the blade to the top is complicated by the method most table saws use to adjust blade height. On contractor saws (and I think your hybrid too) the assembly that holds the blade (and hangs/rides on the trunnions) pivots on an arc to change blade height. The axis of that pivot (basically the whole assembly) needs to be perpendicular to the miter slot and parallel to the top surface. The front and rear trunnions also have to be level/parallel with the table surface too. If the front and rear trunnions (the assembly) are not on the same plane(level), tilting the blade (to say a 45 degrees) will take it out of alignment with the miter slot. I thought you might have put a splinter of wood under your trunnion bracket using a block of wood to adjust it. I found http://www.in-lineindustries.com/saw_pals.html to be very helpful aligning my saws. They might work on your hybrid.

I don’t understand why any one would recommend using a Master (magic) Plate. Using the plywood might be just as accurate and using your blade would be more accurate and cheaper. Good luck. -Jack

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