[GreenKeys] Tape sprocket pitch?

[Duncan Brown]

*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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