[GreenKeys] Spacing problem on a model 15

[drlegendre .]

What an interesting pattern. It seems that (on a given line) there are high
probabilities that it errs in the first few chars, then the few middle-line
chars, and then again for the final chars. Chars in the two, wide "clean"
ranges seem almost immune to the errors.

So here's a question - and we'll just focus on the end-of-line errors. When
it makes these errors, what exactly is going on:

 - Is the carriage failing to regularly advance, that is stalling, and
hence multi-striking?
 - Is the carriage advancing correctly, and then returning (partially) on
the same line to re-strike the given range?

It makes a big difference, as the two modes would seem to be distinct
failures. One mode might be called "sticky" (stalling) carriage, the other
might be called "stuttering" (oscillating) carriage.

On Tue, Nov 1, 2016 at 12:58 PM, Audin Malmin <amalmin at okb-1.org> wrote:

> Hello,
>
> A friend and I are restoring a 15-KSR.  We got it in a partially
> disassembled state and have reassembled it enough to get it running.
> Initially it had a very severe spacing problem; it would only space about
> half the time (an example of this is the page on the right in this photo):
>
> https://goo.gl/photos/589hRU55aBSiNEwF6
>
> After disassembling, cleaning, and reinstalling the main shaft and
> cleaning the vertical spacing shaft (not sure of the term there) it now
> types as in the page on the left of that photo.
>
> But, there is still a spacing problem at two portions of each line.  The
> carriage assembly slides very smoothly, we have not been able to feel any
> drag at any point (including those two areas).  The supporting rods and the
> rack all look straight.  The gears that drive the spacing all seem to be
> nice and round.  We've played around with different return-spring tensions,
> up to the point where there isn't enough tension to consistently trip the
> carriage release return, to no avail.
>
> So, does anyone have any suggestions?
>
> There are more photos and videos of the thing here:
>
> https://goo.gl/photos/mVkLL51odaXKfb4c8
>
> Thanks!
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> 2002-to-present greenkeys archive: http://mailman.qth.net/
> pipermail/greenkeys/
> 1998-to-2001 greenkeys archive: http://mailman.qth.net/
> archive/greenkeys/greenkeys.html
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to drlegendre at gmail.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20161101/deb3a0ed/attachment.html>