I am attaching some pics to illustrate what I am doing. The first two are exploded views of the "elevator" mechanism from the Grizzly 1026 shaper. After I removed mine, I found that it weighed about 40 lbs. The spindle yoke casting is machined into a dovetail shape and it slides very well. Furthermore, if there is any play in the dovetail, two adjustment bolts are there to take out any sloppiness. This is all original to the design.
The next pic should me my "elevator, removed. I put a wooden desc in the spindle area to determine exactly where I want my router bits to exist. The original spindle was about 1/8" off from the center of the drop-in inserts. I am hoping that my router mounting will be more precise than this. The original spindle is about 2.5" dis.
In the next pic, I severed the casting using a grinder and a cutting disc, The cast iron cut very easily.
The next pic is a closeup I think.
Finally, I ground an filed the casting flat, so that those long lines of the casting (stained blue) would be perfectly co-planar with the part that WAS the yoke. Then I drilled and tapped in six places. These 1/4" 20tpi tapped holes will simply be used to secure a precision steel plate to the face of the casting. I would like to go with a 3/8" plate, but there may only be room for 5/16" or 1/4".
This is because I want to use a precision made router mount that I found through a CNC parts site. (I am mounting a Bosch 1617. I believe these measure 3.5" in diameter)
So the next pics, next week, should show how the plate attaches and the 2" thick aluminum router mount bolts to that. Vertical travel should be about 4", so I hope to do "above the table" bit changes.
More soon. I do apologize if I am posting some of this incorrectly- I am new to the forum, and I do not completely understand the posting process.