Have you tried water only - no abrasive?
On Oct 21, 2012 2:24 PM, "Viesturs Lācis" <[email protected]> wrote:

> Hello!
>
> I have a problem with cutting thin (0,5 mm) metal sheet on waterjet -
> it creates a sharp barb (sorry, I do not know correct word in English)
> on the bottom side of the cut all along the cut path. I have seen this
> only on thin metals. For 3 mm thick metal bottom side is fine and
> beautiful.
>
> The thing is that these parts have to be placed atop on each other in
> blocks of 200 parts and even more, so the bottom side has to be
> smooth. Currently they are cutting those parts by hand, but they want
> to reduce the amount of hand labor. Laser and plasma have been
> rejected as they burn off the protective coating on material, but test
> cuts on waterjet have that sharp barb on the bottom that I have seen
> also in other cases, when I was cutting sheets of thin metal.
>
> I know that some LinuxCNC users have experience with waterjets. Can
> anyone suggest me something to fix that? Is it depending on garment
> size of abrasive?
> Slower feedrates have already been tried.
>
> --
> Viesturs
>
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
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