Final Machining of the  Alpha and Beta  Boards
         -------------------------==============---------


                                                       Date  5-Dec-2022


       This note describes the final machining that is required
       for the new   Alpha and Beta  printed circuit boards.

       This work is similar to the machining work that you did on the
       Original Cold Board  and  the NV Board  back in October 2020.

       The finished shape of both the current  Alpha Brd and Beta Brd
       is circular, just like the original Cold Brd, but these two
       new boards have a larger diameter.

       In all cases the 0,0 origin of the coordinate system for all of
       these cards is in their center and all dimensions are in mm.


       Alpha Board:
       ------------

           Finished Diameter:           61.00 mm

           Chip Trench Design:          new design  6 mm x 6 mm

           Alignment Pin Locations:     30.00,   30.00 mm
           X,Y                         -30.00,   30.00
                                       -30.00,  -30.00
                                        30.00,  -30.00

           Hold-Down Screw Holes:       14.85,   14.85 mm
           X,Y                         -14.85,   14.85
                                       -14.85,  -14.85
                                        14.85,  -14.85


       Beta Board:
       -----------

           Finished Diameter:           61.00 mm

           Chip Trench Design:          original design  2 mm x 7 mm

           Alignment Pin Locations:     30.00,   30.00 mm
           X,Y                         -30.00,   30.00
                                       -30.00,  -30.00
                                        30.00,  -30.00

           Hold-Down Screw Holes:       14.85,   14.85 mm
           X,Y                         -14.85,   14.85
                                       -14.85,  -14.85
                                        14.85,  -14.85


       Notes:
       ------

           The diameter of the  Original Cold Board  does NOT match
           the diameter of the new  Alpha and Beta  boards.
             56.00 mm diameter for the original Cold Brd  vs
             61.00 mm diameter for the new Alpha and Beta


           The  location of the Alignment Pin Holes in the  Original Cold
           Board  does NOT match the location of the Alignment Pin Holes
           in the new  Alpha and Beta  boards.
             31 mm for the original Cold Brd  vs
             30 mm for the new Alpha and Beta


           The location of the Hold-Down Screws Holes in the Original
           Cold Board  does NOT match the location of the Hold-Down
           Screw Holes in the new  Alpha and Beta  boards.
             16.62 mm for the original Cold Brd  vs
             14.85 mm for the new Alpha and Beta


           The design of the  2 mm x 7 mm Chip Trench  in the Original
           Cold Board   DOES exactly match the design of the  2 mm x 7 mm
           Chip Trench in the new BETA board.


           The new Alpha board has a new 6 mm x 6 mm Chip Trench design.