table alignment

[JPG40504]

I am not going to take my table apart for an investigation but I think that I would prefer that the pivot hole to be tight and the others loose. I don't see a reason for the whole table to float all over the place when trying to do an adjustment. If alignment can not be achieved without opening the pivot hole then manufacturing tolerances and assembly procedures need to be checked.
Bill V

A sleeve over the bolt(pivot) will do that!

[wa2crk]

JPG
Exactly!!
Bill

[JPG40504]

JPG
Exactly!!
Bill
A removable sleeve with all 4 holes 'big' will allow you to 'pick' the pivot point. It does not have to be one of the two 'accessible' ones. A loose screw will keep the sleeve captive and provide the pivot.

P.S. I did not mind 'taking apart' the 510 trunion, since I have not yet aligned it myself(WIP on back burner as noted below!).

[dusty]

I am not going to take my table apart for an investigation but I think that I would prefer that the pivot hole to be tight and the others loose. I don't see a reason for the whole table to float all over the place when trying to do an adjustment. If alignment can not be achieved without opening the pivot hole then manufacturing tolerances and assembly procedures need to be checked.
Bill V

I have drilled out three rear trunnions now and performing table alignment on these three tables is now a very simple task. Before doing that the alignments were something of a chore.

However, I would recommend doing this only to a table that is declared difficult to align. In other words, if it ain't broke - don't fix it (but please don't complain about the procedure being difficult).

Bill V: I know that you did not complain.

[algale]

I am not going to take my table apart for an investigation but I think that I would prefer that the pivot hole to be tight and the others loose. I don't see a reason for the whole table to float all over the place when trying to do an adjustment. If alignment can not be achieved without opening the pivot hole then manufacturing tolerances and assembly procedures need to be checked.
Bill V

That's what I thought. So I initially left the pivot point (right rear) at 3/8 and remounted the trunnoin. With the table upside down I tried to pivot things. It was better than before with just the one hole drilled out to 1/2 but I was leary of another 4 hour alignment party! So, I took the trunnion off again and redrilled that last hole to 1/2 just to be sure. Remounted the trunnion and alignment was a breeze, relatively speaking.

Now I'm not an expert on manufacturing so I can't comment on whether the tolerances and procedures need to be checked. But I can say that table does not "float all over the place" even with all 4 holes at 1/2 inch. The procedure Nick recommends in the first Sawdust session works well. Loosen both front trunnion bolts and the left rear trunnion bolt and snug them back up. As for the rear right trunnion bolt, make that one a bit tighter than snug and it works like a pivot point. In this configuration the table can be moved for alignment but it doesn't slide around all sloppy.

Your mileage may vary.

Alan

[robinson46176]

Tossing this out for thought. What if you mount an extension table on the right end at the same height as the main table, then loosen the trunnion bolts and slid the main table over close to the extension table and lock the carriage. Align the main table 90° to the quill then slip in wedges or shims between the main and the extension and clamp them together to hold the main in place and re-tighten the bolts.

????


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