[GreenKeys] Tape sprocket pitch?

[COURYHOUSE at aol.com]

It is always    great to  share  this   stuff... because eventually   the  
same  problems   appear  for  others  too!
 
I am pretty good at  remembering a solve  but  I   also , when I  see 
something like  this   odd  problem,   save it aside in a  mail   folder   called 
 "Problem solving" 
 
This one is  really  curious   I am looking   forward to the solve  for it!
 
Ed#
 
 
In a message dated 11/10/2013 9:10:04 A.M. Mountain Standard Time,  
duncanancy at earthlink.net writes:

When  all else fails, read the manual!

Looking the manual for the Single  Magnet Reperf, I found that there is an 
adjustment for the feed pitch (an  eccentric on the star wheel detent lever) 
that affects the feed pitch.   There is even a gauge (p/n 2215) to help in 
measuring the pitch (10 feed holes  per inch).  I'll have to look in my 
Teletype Repairman's Toolbox to see  if I have one.

So when I get back to the Museum on Tuesday, I can  adjust the pitch and 
more importantly, try to figure out why it is  occasionally failing to punch 
the 4th & 5th  bits.

Duncan


On 07-Nov-13 23:05, Duncan Brown wrote:


Did the TTY  tape sprocket pitch change between the 1930s and the 1940s? Or 
would you  typically see some variation in pitch between two machines? 

I made  my Christmas Music tape on a AN/FGC-9 (M19) punch and then made a 
copy with  a "Single Magnet" reperforator that sits on the little dolly under 
the  M19.  The reperf had worked fine the last time I used it (a year or 
two  ago) but this time it was missing (not punching) a few holes in the 4th  
& 5th rows. Luckily, I had my Pettey "Perfect Poultry Punch" with me, so  I 
just put the original tape and the new tape together, looked for missing  
holes and then punched them.  But as I moved down the tape, I had  trouble 
keeping them aligned. When I finished punching the missing holes, I  held the 
two tapes together with the same starting points and found that one  tape had 
four more characters than the other! Four characters difference in  about 
three feet of tape.  Is that typical or was there a change in the  pitch 
between the two different machines?  The M19 is WWII vintage and  the "Single 
Magnet" is probably not much older. 

Any thoughts??  

Duncan 
K2OEQ 







 
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