DLB wrote: ↑Thu Nov 25, 2021 8:29 am
dusty wrote: ↑Thu Nov 25, 2021 6:37 am
...
Loosen the four trunnion bolts, push the trunnions hard against the bolts ( in any direction ), secure the bolts, and check alignments.
This will produce significantly different results on 510 and on tables with the 'old-style' trunnions compared to those with four trunnion holes the same size! With four 1/2" holes this gives you a good close starting point, but with two 3/8" holes and two 1/2" holes (like the OP has) it won't. If you have even one 3/8" hole, isn't the end result of alignment going to be all four bolts essentially centered (within a few thou) in their holes?
- David
I am seeking a trunnion that has not been drilled to 1/2" so that I can assemble and test this scenario but I don't expect a lot of change.
If only one trunnion bolt is 3/8", yes, That trunnion bolt becomes a pivot point and everything rotates around ot but the rotation is still limited to about .2 degree.
If either trunnion has two 3/8" holes, the amount of rotation is significantly limited. This was the contention when the recommendation to drill the trunnions first arose.
This sketch, however, was prepared by measuring each of the items in the assembly and transferring those measurements to the drawing. I did each part independently and then assembled the final drawing one piece at a time. The final is a collection of five different drawing superimposed and positioned according to my measurements. My model was my 520 fully assembled and critically aligned.
I believe that a 510/520 full table assembly could be aligned and mounted with no need for further tweaking. The Shopsmith is an assembled of well designed individual parts that when assembled properly produces a fine home multi-function tool.
I left dimensions off of this sketch on purpose. The intention is to highlight the fact that all of the parts that contribute to alignment are assembled either parallel to or perpendicular to other parts. If you would measure everything in the sketch, you would find that 1/16" increments prevail throughout. There are no extreme precision items involved.