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Unread 04-01-2014, 06:09
Navid Shafa Navid Shafa is offline
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Re: pic: 2014 Offseason CAD

Quote:
Originally Posted by Johnny_5 View Post
Careful with waterjetting that thin of material, depending on what kind of machine you are using, you can end up with some pretty bad cuts.

When the machine begins the cut, it uses a much high pressure to first pierce the material and then it lowers it to actually run the cut. Sometimes the back of the sheet metal can blow out with that initial jump.

However, this can be pretty easily solved with the Omax jets (I'm sure Flow does this stuff too) they have a drill attachment that goes on the head to first drill through the sheet. Or you could opt to drill it yourself and then use the camera locating tool to tell it where to begin the cut.
I would not be concerned about cutting material this thin. I've cut plenty of thin aluminum to high precision, even 1/32" thick carbon fiber comes out nice.

It all depends on your fixturing methods. It's imperative to properly clamp and weight your material in place. Even plastics and low-density materials are not a problem.

As an OMAX employee and FIRST participant, I've never had to use a drill attachment before. If piercing is an issue, you can easily adjust the pressure ramping in software to achieve smoother piercing. Optical locating is also overkill...

If material blow-out or frosting is an issue, don't be afraid to throw a piece of wood or other sacrificial material underneath. It's a quick way to ensure a nice surface finish.
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