RE: [CAD_CAM_EDM_DRO] electrical code?

Grounding, grounding, grounding! Make sure all your metal components are
bolted together. If the bolts are over paint, put in bonding jumpers. Make
sure your machine is bonded to your control cabinet. Make sure your D.C.
negatives are all grounded. Make sure none of your high voltage side is
near the chassis, or else put an insulator between them.



Regards,
Jeff

-----Original Message-----
From: Harvey White [mailto:madyn@...]
Sent: Thursday, April 17, 2003 10:14 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] electrical code?

On Thu, 17 Apr 2003 13:27:30 -0000, you wrote:

>Hi all,
>
>Thanks to this list and helpful members, I have now acquired skills
>and knowledge and have cobbled together working stepper drivers, etc.
> I have learned to use things like using heat shrik tubes to
>isolate exposed live wires, etc. However, while the drivers work, I
>am not so happy with the state of the wirings, which seem a little
>messy.
>
>Now I want to aim a little higher - to make the driver a bit more
>professional, especially from the aspect of electrical and other
>safety. What are the things one would need to think about? What
>should one to to make the driver more "professional" and fullfill all
>aspect of electrical code?

Construction techniques can be improved. Cable ties can bundle wires so
they don't go everywhere. Good soldering is important, both for reliability
and for appearance. Good mechanical finish on the enclosures and laying out
all the holes in a regular pattern is also helpful. Using the right size
wires and using disconnects and good quality connectors to the boards (if
not hard wired) is also good.

Electrically, good heatsinks, proper part spacing, good quality parts, good
mechanical mounting, properly rated connectors, proper use of fuses, those
help too....

One trick you can do for a front panel is to use a laser printer or an
inkjet on transparent film (or photo style paper if you want opaque), then
place that under a layer of plastic. The metal panel, transparency, and
plastic become a somewhat thick, but very artistic front panel.

Some projects, both mechanical, and electronic, can be found at
www.netcom.com/~madyn and go to the electronics or the metal links for
various ideas. You can also reach the metalworking pages directly by going
to www.netcom.com/~madynmetal

Harvey




>
>BTW is there a code for electrical items like stepper driver one can
>refer to?

Electrical codes, but those can be less than useful.

If you can find a piece of military gear, check to see how it is wired...
Also, find a piece of equipment that you think is neatly wired and see what
they did...

Neat may just be the major key.

H.


>
>Many thanks
>
>Andrew




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