Completed the bearing blocks for the crank. The crank will be 3/8 so I used a pair of 3/8 X 9?16 X 1/2 needle bearings.
Squaring up the 1/2" stock for the two blocks.
Drilled and reamed to 9/16 for the bearings.
Needed to use the rotary table for the tops of the two blocks.
At one point in the past I made a taper fitting for the centre of the RT that will accept a 3/8 pin.
The centre pin makes set up of the bearing straight forward. I now have a set of pins that step up or down from the 3/8 in the taper plug.
Used the side of the block to set up square at the 0 degree point.
I had to get an extended length mill from KBC to reach all the way through the 1/2" material. Decided on double ended and ordered two to cover my uncertainty milling with a 1/8 cutter 1/2" deep.
Turned out that I didn't need the three extra cutting surfaces - the first one lasted and I didn't break it!
Plunge cut in and around the 90 degree arc and out the other side and then did a cleanup climb milling pass to take off the last 5 thou.
Blocks finished and fit to the base.
Cross head guides next.