[Halld-tracking-hw] Stand-off sketch ...

[Curtis A. Meyer]

Attached is a rough sketch showing the proposed stand-off scheme. 

1) A 6/32 blind threaded hole is drilled in the endplate.

2) A 6/32 set screw is screwed into the hole. We can use conducting
    epoxy to improve the connection if needed.

3) A 1/4 inch electrical standoff with a 6/32 tapped hole is screwed onto
    the set screw. There are three possible variations on this for the end
    in contact with the endplate.
    i) There is room for the 1/4 inch, nothing specicial
    ii) There is not quite enough room for the 1/4 inch due to the  heads of
         the feedthrus extending 1/10" above the surface of the plate.
         We can order a standard 1/4 standoff that has a diameter of 188 
for the
         last .133 inches. This comes from McMaster-Carr.
    iii) Or we can make in house modifications:
          a) we can (in house as needed) taper the end of the standof 
down to ~188
              from 250 so it will fit,
          b) we can (in house) as needed remove some material from the head
              of the feed throughs so that the 1/4 in can reach the 
endplate.

4) A .156 inch hole is drilled through the lucite plate.

5) A 6/32 set screw goes through the lucite plate and screws into the 
standoff.

6) Epoxy, or conducting epoxy in placed around the 6/32 set screw.

7) A  1/4 inch electrical standoff with blind 6/32 holes is screwed

8) The connector is attached to the standoff.

We also would like to propose the standoffs that hold the HV card be on 
opposite
 sides of the card, rather than both on the same side. This gives less 
chance that the
card will tilt during installation and removal.

@===  High-voltage board
O          Standoff/set screw of installation/removal.

                                   O
                                @=============================@
                                                                                                   
O

Curtis, Gary and Yves

-- 
Prof. Curtis A. Meyer		Department of Physics
Phone:	(412) 268-2745		Carnegie Mellon University
Fax:	(412) 681-0648		Pittsburgh PA 15213-3890 
cmeyer at ernest.phys.cmu.edu	http://www.curtismeyer.com/      


-------------- next part --------------
A non-text attachment was scrubbed...
Name: Standoff.pdf
Type: application/pdf
Size: 15185 bytes
Desc: not available
Url : https://mailman.jlab.org/pipermail/halld-tracking-hw/attachments/20090930/1434c5da/attachment.pdf