Originally, this Y carriage design was meant for the plasma build. After building it, I decided it would work well as a starting point for all builds with only slight modifications.
Y Carriage Plate Adapter
The Y Carriage Adapter Plate, is the key behind the Y carriage. It is designed be be milled out of 1/2" aluminum, but I will be starting with 1/2" Corian.
The Y carriage plate has to be at least 1/2" thick so that the bearing truck bolts heads can be recessed below the top surface.
Eight 6mm screws are used to attach the Y carriage plate adapter to the two extended 20 mm trucks.
I used two extended trucks in stead of the standard trucks for more rigidity. This gets twice the bearings against the rails.
I found it easyer to just place the trucks on one of the Y rails and install the plate in place.
Y Carriage Riser Block
Next, I added the 8 T-nuts for the Y carriage Riser block as shown here.
I'm using 1/4-20 bolts and T-nuts.
With the carriage in place the T-nuts are placed on the inside edge of the carriage.
A 14" long piece of 2040 series 1 extrusion is slipped over the T-nuts.
I make sure the extrusion is flush with the outside edge of the Y carriage adapter. The end should be flush with the end of the Y carriage adapter.
With the extrusion flush with the front edge of the carriage, it will be overhanging 2" on the back, as shown here.
I created two carriages, one is a mirror of the other. They will be placed on the Y rails in this orentation.
The finished carriage blocks look like this.
From this point I will start to add components for the X axis.