Re: [CAD_CAM_EDM_DRO] Re: plasma accuracy

Hi, I am new to the list but have spent years building and painting custom
cars & street rods as a hobby. Water in your air causes many unwanted paint
problems. Not all that different from plasma cutting. There are several
very good dryers, filters, etc. available in the auto body industry. Some
are quite expensive, while others are inexpensive. One of the best and
least expensive is a simple cannister that holds a roll of bathroom tissue.
I believe they are made by Motor Guard. I have several and have used them
for over 20 years with great success. If you change the tissue regularly.
I also use water traps and coalescing filters(oil removal). I also have
several desiccant dryers. These have beads or pellets that are
rechargeable(remove & dry in an oven to remove the moisture). The more
expensive have built in dryers that automatically take the unit out of
service, the dryer then kicks in and regenerates the pellets, when the
pellets are recharged it's ready to go back on line. The refrigerated
dryers are the most expensive. Any or all of these work well if maintained.

What is needed will depend upon the volume of air that is being consumed.

Bruce

-------Original Message-------

From: CAD_CAM_EDM_DRO@yahoogroups.com
Date: 12/21/04 01:26:51
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: plasma accuracy


--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
wrote:

> Oh ok, well that makes sense. moisture in the air being conductive.

Could one use an inert gas such as Co2 with better results than air
regarding tip failure? Argon would be better probably but much more
expensive.

>
> Ron

I'm not sure of the air volume, but you can solve the compressed air
moisture pretty easily. Albeit with some work.

A post compressor heat exchanger would help drop the compressed air
temperature somewhat.

A simple refrigerator with airline coiled inside would offer a
mechanical cooling of the air line.

The exit air of the refrigerator could then be used as the pre-
cooling side of the heat exchanger. Warming the air to the torch,
but using some of the colder refrigerated air to pre-cool the air
entering the refrigerator. This would reduce the load on the
refrigerator.

Putting a bucket of water in the frige and the coil in tht would add
a signifigant thermal mass also.

Just some ideas.

Dave





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