Re: Commodore 1520 supplies + programs

A success-story with the gears: http://www.lemon64.com/forum/viewtopic.php?t=52589

--
Ville L.


MikeS <dm561@torfree.net> kirjoitti 25.6.2014 kello 19.56:

> > ...as we know - not only the directly adjacent gear can be affected.
> 
> Oh? How could a badly made gear affect anything other than the gear with 
> which it mates (assuming they can even rotate in the first place)?
> 
> As I said, instead of speculating on the various reasons why it can't be 
> done, why not just mail Gene a pair of split gears from one of your several 
> units that all have this problem and see what he can do?
> 
> Re the pens:
> 
> As you probably know, the Alps mechanism used in the 1520 was also used in 
> various other printers, eg. Tandy CGP-115 and the PC-2 printer, Atari 1020, 
> several Sharp models etc.
> 
> But they were apparently also used in some medical equipment and several years ago a German company made replacement pens; it might be worth while to follow up and see if by chance they are still available:
>  
> ---
> "The pens correspond actually accurately to the defaults of the models 
> EA850C and EA850B including the crucial ball point. We worked at the project 
> nearly 1 year; and first we experimented with a fiber tip, but this wasn't 
> acceptable by the technical examination of international medical technology 
> manufacturers. We now sell the current version to Scandinavia and into the 
> USA with no objection. Our actual emphasis lies in the medical technology 
> but the pens are also useable for computer plotters.
> 
> The company sells the pen sets internationally and has 2,000 sets at its 
> stock. Contact Christane Lass by email: Christiane.Lass@t-online.de if you 
> want to get more info or if you want to order the set(s)."
> 
> 
> ---
> 
>  
> Paper should not be a problem, although a single roll at a reasonable price might be hard to find; it's just an ordinary calculator/cash register roll, 4 1/2" x 2 1/2" diameter.
>  
> m
> 
> ----- Original Message ----- 
> From: <silverdr@wfmh.org.pl>
> To: <cbm-hackers@musoftware.de>
> Sent: Wednesday, June 25, 2014 5:37 AM
> Subject: Re: Commodore 1520 supplies + programs
> 
> 
> On 2014-06-25 at 00:53:26, geneb (geneb@deltasoft.com) wrote:
> 
> > Send me an STL file of the gear and I'll give it a shot.
> 
> Somebody would have to make one first. I didn't do it yet.
> 
> > Worst case, it doesn't work.
> 
> No. Worst case is that the rest of the mechanism degrades quickly.
> 
> Please don't get me wrong. I am sure you or Shapeways can print something 
> that will somehow fit and turn and maybe even drive the other gears ;-) What 
> I wouldn't like to risk is having it somehow work for some time, only to 
> discover that more damage has been done to other parts due to inaccuracies 
> (centering, teeth shapes, tooth walls smoothness, etc). And as we know - not 
> only the directly adjacent gear can be affected.
> 
> Having said that - I am still very curious what would be the output. It is 
> so small that maybe you can try just a quick shot of a generic gear that has 
> the (I don't know the English terms for the gear parameters) outer diameter 
> of 3.7mm and 1.5xx (don't remember exactly - maybe somebody can check it 
> directly with his device) inner hole. There should be some generic designs 
> with appropriate number of teeth that one could resize. Not to work with 
> this one later but just to have a kind of POC if spending time on exact 
> reversing the actual gear makes sense as of now.
> 
> --
> SD!
> 
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