The aluminum Z carriage goes together as outlined in the book. The pockets in the risers should be done the just like you did on the aluminum Y carriage plates.
Attach the templates to the risers and the Z carriage plate as shown here.
In addition I added the Z Carriage Tool Holder Hole template from Volume 2. It is not required, but may save you some time later.
Drill the holes holes into the two risers as shown here. Add the 1/2” pockets. Note that only two pockets per truck are actually required.
Shown here is the risers attached to the trucks. The other truck mounting screws will be added later through the Z carriage plate.
Drill the holes into the Z carriage plate as outlined in the book. Notice the four 1/4” holes at the bottom. These will be used later to attach various tool holders.
Attach the Z carriage plate as outlined in the book. No real difference for an aluminum carriage, it’s just heaver.
The X carriage will be removed at the beginning of book 2. So to save you some time, remove it now and place it on a table.
You can then attach the Z carriage for testing as shown here.
Be very careful, with the heaver aluminum, it is much easier to dislodge a bearing ball in one of the trucks. If this happens don’t panic. I have run machines for years on trucks missing a few bearing balls without effect.
Making the Pockets
Here is a little video of me making the pockets.