[Halld-tracking-hw] Final drawings feedthrus

[Tim Whitlatch]

Correction (as Slava has just pointed out)

Feedthru ID 0.250 +.002/-.000

It is correct on the drawing.

Tim

Tim Whitlatch wrote:
> Hi Curtis,
>
>  Slava has completed what we hope are the final drawings for the 
> feedthru, donuts, crimp pins and inserts.
>
> The dimensions and tolerances are as follows;
>
> Straw OD 0.622 (max) (inches)
>           ID 0.611 +.002/-.000
>
> Donut ID 0.4375 +.0020/-.0000 inches
>           OD  0.611 + .000/-.002
>        concentricity of  two diameters of .002 inched (on diameter)
>
> Feedthru  ID 0.250 +.000/-.002
>                 OD 0.4375 +.000/-.002
>        Concentricity .002
>
> Insert  ID 0.039 ±.0004
>           OD 0.250 +.000/-.003
>
> Crimp pin OD 0.039±.0004
>
> The ID of the feedthru will be specially made so the crimp pin stays in 
> from slight friction.
>
> End plate straight holes have a true position of 0.005 on the diameter 
> (±.0025 essentially)
>
> These dimensions leave .000 to .002 radial clearance at each glue joint.
>
> If all the tolerances were to add up in the wrong direction, there is a 
> possibility of straw to straw interference on the straight holes by 
> about .006 inches. The nominal clearance straw to straw is .009 inches 
> (238 microns). I believe the interferences will not be an issue as the 
> likelihood of all the tolerances being in the wrong direction are low.
>
> The drawings can be found at;
>
> http://www.jlab.org/~vgr/CDC%20Small%20Parts%20Final%20Dwg-14Aug2009/
>
> The endplates will be ready Monday.
>
> Please review them so we can discuss Monday and get the parts out on the 
> street.
>
> Thanks,
>
>        Tim
>
>
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