Homebrew PCBs

Stefan,
I used hexagon bar, like the bar used for making nuts and bolts, for the rails. I have uploaded a pdf into the files area under the folder JLC that shows a cross section of the setup. It uses roller-skate bearings and 3/4" or 19mm hexagon rail. The entire unit can be constructed using only a drill press. My table is 1 metre * 600mm. It can be scaled up or down quite easily. the critical thing is the size of the bearings relative to the hexagon bar. I have used 12mm bar with 12mm bearings and 16mm bar with 17mm bearings also. The feed screws are 10mm * 1.5mm pitch stainless threaded rod with bronze nuts that are split and cross screwed to take up the backlash. These screws turn in 10mmID * 30mmOD deep groove bearings SKF number 6200VVCM. They cost AU$3.2 each; that is about 1.1EU. The roller-skate bearings were really inexpensive.
Hope this gives you another idea.
Regards
John C


-----Original Message-----
From: Stefan Trethan [mailto:stefan_trethan@gmx.at]
Sent: Sunday, 3 August 2003 8:01 AM
To: homebrew_pcbs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Re: re : sqare steel "pipes" as rails?


ok, i will read further...

in fact i asked a friend (who has adsl and no stupid 56k modem) to download 
this "offline package with all messages"..
first i only saw some very special not too interesting posts....

regards
stefan

On Sat, 02 Aug 2003 23:52:22 +0200, Markus Zingg <m.zingg@...> wrote:

>> the postings i read were not too interesting to me but i only viewed a 
>> couple...
>
> Uhh, Stefan, here you are (IMHO) very wrong. I alredy found a lot of
> very interesting information by reading posts there.
>
> Dave, thanks for this link. I did not knew that such a group existed.
>
> Markus
>
>
> Be sure to visit the group home and check for new Bookmarks and files:
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