Hub Module    FPGA Heat Sink
              --------------

Rev.  7-April-2017


Please manufacture the Hub Module  FPGA Heat Sink.

This work is for Wade Fisher and is on account:  RC104022

The FPGA Heat Sink consists of 2 parts:

  - the heat sink extrusion itself with 10 holes in it   and

  - a Filler Block with 6 holes in it that goes between
    the FPGA and the heat sink extrusion.


Quantity:

  -  I would like just  1  complete FPGA Heat Sink  (a drilled
     heat sink extrusion plus Filler Block)  at this time so
     that I can verify that the design is correct.

  -  Then I would like  9  complete FPGA Heat Sinks for the
     proto-type Hub Modules.  This will be in about one month
     or so.

  -  Then later this year Wade anticipates that we will be
     making about 20 more Hub Modules and they will require
     another  20  complete FPGA Heat Sinks.


Current Assembly Plan:

  - Manufacture the bare heat sink extrusion with its
    10 holes  and  the Filler Block with its 6 holes.

  - Send out just the heat sink extrusion out for
    black anodizing.

  - Press 6 of the 8-32 5/8" Pem studs into the Filler Block.

  - Put thermal paste between them and bolt the heat sink
    extrusion and the Filler Block together as tight as
    possible.

  - Flatten the bottom surface of the not anodized Filler
    Block so that it is smooth and flat and thus can make
    a good thermal contact with the FPGA.

  - This makes a complete Hub Module FPGA Heat Sink that
    is ready to install on to a Hub circuit board.

The details of the FPGA Heat Sink are indicated in the
attached 4 drawings.

  -->  Note that in late 2013 and early 2014 Rob made similar
       heat sinks for the CMX circuit board.  He developed a
       technique using the Hurco to cut the heat sink fins
       without bending them around too much.

       Tom Hudson did a very nice job of making a smooth flat
       surface on the bottom of the CMX heat sinks so that
       they were in good thermal contact with the devices
       that they cool.  After these new Hub Module heat sink
       assemblies are bolted together I hope that it is
       possible to flatten and smooth the bottom of the
       Filler Block.

Please call me when you are ready to discuss any of
the details about this FPGA Heat Sink part.

Thank you for your work on these parts,   Dan Edmunds