Operation
OMAX JetMachining® Center Operator’s Guide
400433D-EN
3 - 3
3.
The pump control has a “Low PreSet” RPM mode for low pressure operations with the OMAX
JetMachining Center. This is useful for piercing brittle materials or etching and scribing materials
at reduced pressure.
4.
The “Low PreSet” RPM value is set by pressing and holding the keypad’s
Reset
button while also
pressing either the
up
or
down
arrow button. Attempts to set the RPM lower than 700 RPM
causes the display to repeatedly flash the message “@MIN”. The low RPM mode can be activated
only by a signal from the JetMachining Center controller.
Pump Operating Characteristics
1.
The electric motor should always be operated at or above the minimum RPM to ensure sufficient
lubrication of the pump crank within the crankcase. The pump control will not permit sustained
operation below the minimum RPM.
2.
The maximum design output pressure is limited to 40,000, 50,000, or 55,000 psi, depending on
the specific pump model. The pump control does not allow sustained operation above these limits.
3.
Low PreSet
is the factory set value of motor RPM for low-pressure operation and can be changed
at anytime by the user. When operating with the OMAX JetMachining Center, this is the operating
pressure for piercing and etching and is activated from the JetMachining controller.
4.
Hi PreSet
is the factory set motor RPM value for high-pressure operation and also can be
changed at anytime by the user until the maximum allowed output pressure of the pump is
reached. The Hi PreSet value can be adjusted up to, but not above, the Operating Point output
pressure value, or a maximum of 2000 RPM. Hi PreSet is the motor RPM value that the pump
normally returns to when started. When operated with the JetMachining Center, it is the high-
pressure mode.
5.
Operating Point
is the motor RPM corresponding to maximum performance and maximum
horsepower available.
OMAX JetMachining Center Overview
About Abrasivejet Machining
Industrial abrasivejets have been in use since 1982. An abrasivejet uses water that is pressurized to more
than 40,000 pounds per square inch (psi) (2760 bar). This high-pressure water enters at the top of the
cutting nozzle and is forced through an orifice assembly containing a round jewel with a small hole in it (see
Figure 3-1). Forcing the water through the hole in the jewel accelerates the stream of water up to 2500 feet
per second (760 m/s). This fast moving stream moves into a larger chamber, where the speed of the water
creates a suction that draws in the flow of abrasive. The abrasive is stored in a hopper on the moving head
of the X-Y table. An air-controlled valve in the Bimba valve releases a stream of abrasive into a feed tube
where it flows to the nozzle. This stream then moves into the mixing tube. The mixing tube has a small hole
through the center that serves to contain the water and abrasive as they mix to form an abrasivejet. The
mixing tube is made from a hard, brittle material designed to resist abrasion. The water and abrasive are
combined into a high-speed slurry at the bottom of the mixing tube. This slurry becomes the cutting tool as
the tube focuses the jet stream at high velocity out of the bottom of the tube and onto the material being
machined.
Summary of Contents for JetMachining Center 2626
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Page 12: ...OMAX JetMachining Center Operator s Guide xii 400433D EN ...
Page 22: ...OMAX JetMachining Center Operator s Guide Safety First 1 10 400433D EN ...
Page 140: ...OMAX JetMachining Center Operator s Guide OMAX Glossary 6 16 400433D EN ...
Page 144: ...OMAX JetMachining Center Operator s Guide Index 4 400433D EN ...