[GreenKeys] Help with Model 15 Adjustment - bouncing carriage return

[Richard Knoppow]

----- Original Message ----- 
From: "Paul Baggenstoss" <baggens at yahoo.com>
To: <greenkeys at mailman.qth.net>
Sent: Sunday, January 27, 2013 8:45 PM
Subject: [GreenKeys] Help with Model 15 Adjustment - 
bouncing carriage return


> Hi, I'm new to the group. I have a Model 15 (actually 
> TG-7B)  that I have been using as a printer for all kinds 
> of internet applications like weather and news. I have 
> written an interface program and built a loop supply and 
> terminal unit. It's a fantastic piece of machinery!
>
> I wonder if anyone in the greenkeys group has some 
> experience with a
> bouncing carriage return.  My Model 15 seems in all other 
> aspects to be in great shape. But recently I took the type 
> bar carriage off to do some oiling and put it back on, and 
> put a drop of oil on the carriage return dashpot piston. 
> Ever since then, it prints without being able to find the 
> start of the page.  It looks like this:
>
> Sometimes is starts here...
>   But sometimes here...
>  and sometimes here...
> And back to here.....
>
> It seems to bounce when it hits the dashpot, but not 
> always. Perhaps it is not a dashpot bounce, but a hard 
> bounce - not sure.   It depends how far it travels - that 
> is how long the last line was.  The dashpot seems to work 
> if I hit it hard with my hand, it gives a satisfying hiss 
> and absorbs the shock.
>
> The manual talks about adjusting the dashpot vent screw so 
> that there is "no bounce and minmum shock".  But his does 
> not seem to be enough information.
> I have tried the full range of settings for the dashpot 
> vent and have set the spring drum for the 4 pound setting 
> to move the type carriage. I also have tried as low as 1 
> pound spring tension. I can't seem to get it right.  What 
> drives me crazy is that it started happening all of a 
> sudden - having only put a drop of oil on the dashpot 
> piston and re-set the spring drum tension. For the time 
> being, I have set the software to do always 3 carriage 
> returns so that it finishes bouncing before the next line 
> starts.  Any help is appreciated.
>
> Paul Baggenstoss AI1F
>
    I am not an expert on Teletypes...  Why did you oil the 
dashpot, is it specified in the service instructions?  If 
not perhaps cleaning the oil out will help. I've had 
experience with dashpots in sound recording equipment but 
don't remember any that required oiling.
    There are real experts here (not kidding) so we will see 
if I am full of oil.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com