[Hallicrafters] Spline key size for s-38c

[Chuck McGregor]

Alan,
According to Machinery's Handbook,  a #5 or #6 set screw takes a 
0.072 inch outside diameter spline.  A #8 set screw takes a 0.096 
inch outside diameter spline.  In the McMaster Carr catalog both of 
these sizes are in the six-flute series of spline (Bristol) wrenches. 
So, they "should" be the two smallest keys in your 10-key set.

So much for theory.  The knobs on my SX-42 have #6-32 setscrews, and 
a Xcelite #99-63 driver fits them.  That is supposedly a 0.069 inch 
diameter, 4-flute spline.  (That spline also works on my SX-71).  and 
it should be the smaller of the two 4 spline keys in your 10-key 
set.  Sorry I don't have an S-38 to check.

  IF somebody has previously buggered the setscrew, trying to turn it 
with a hex wrench, the correct spline wrench may no longer fit.

73 & Good luck,
Chuck N7RHU

At 04:19 PM 6/2/2007, you wrote:

>I have 2 spline key sets (9 and 10 key) from McMaster-Carr.  Neither 
>of these has a key which will fit the knobs on my S-38C, nor will 
>any allen wrench come close enough.  Allegedly the 10 key set fits 
>Halli and Collins.  If anybody would kindly let me know what size 
>and number of flutes fits their S-38C, I would appreciate it.
>
>Thanks -- Alan, wb2erj
>aadelma at yahoo.com
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