Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

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GMasterman
 
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Default Tried E machine today

Two 1/4" 6061 aluminum disc 7" in diameter, nothing more complicated than
cutting them out with hydrojet-$147 a pair. Sound reasonable to ya'll? Not to
me
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Jon Elson
 
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GMasterman wrote:
Two 1/4" 6061 aluminum disc 7" in diameter, nothing more complicated than
cutting them out with hydrojet-$147 a pair. Sound reasonable to ya'll? Not to
me

A CNC milling machine could do this in a couple of minutes. That is
probably the most cost effective tool to just do a few of these parts.
There is no sense using water jet for simple jobs in easily-cut
materials. If this was 1/4" hastelloy, water jet could be the tool
of choice.

Jon

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Doug Goncz
 
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It all depends on whether you can take a pilot hole or diimple in the center.

Two 1/4" 6061 aluminum disc 7" in diameter, nothing more complicated than
cutting them out with hydrojet-$147 a pair. Sound reasonable to ya'll? Not to
me


NC hydrojet? I guess so, given amortization, scrap, and programming and
operator time.

But they could be trepanned on somebody's mill at far lower cost, or bandsawed
to the line and turned with a center dimple.

For raw productivity, though, you'd take a center hole and do it on a drill
press at near materials cost.


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Carl
 
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It would only be about a couple of minutes with a waterjet. Just to
see how much time it would take, I went ahead and programmed up my
waterjet to make a 7" disk. It took about 30 seconds for me to make a
program for a 7" disk, and it will take just under 1 minute to
actually cut it. The long part of the job would be lifiting the plate
into and out of the machine, which would probably take 2 more minutes.
So, a job like this should be done in under 5 minutes and easily in
10. Making two of them would only take 1 more minute.

At $147 I would say that someone just does not want to be bothered
with a small job. There are a gazillion shops out there that can do
the work for you. See:

http://www.waterjets.org/waterjet_jobshops.html

or

http://www.omax.com/job_shop_match.html

Carl.
http://www.waterjets.org

Jon Elson wrote in message ervers.com...
GMasterman wrote:
Two 1/4" 6061 aluminum disc 7" in diameter, nothing more complicated than
cutting them out with hydrojet-$147 a pair. Sound reasonable to ya'll? Not to
me

A CNC milling machine could do this in a couple of minutes. That is
probably the most cost effective tool to just do a few of these parts.
There is no sense using water jet for simple jobs in easily-cut
materials. If this was 1/4" hastelloy, water jet could be the tool
of choice.

Jon

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