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Waterjet Group -> Tips and Questions -> Chipping Glass
Post Info TOPIC: Chipping Glass
JWaterhouse


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Chipping Glass
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How do you prevent glass from chipping during the piercing process?

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J. Waterhouse
Jake


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Typically the best way to pierce glass is to use a vacuum assist assembly and set the pump at low pressure. A low pressure pierce of 15-20K will help reduce the possibility of chipping.  Use the pierce then cut or pierce all holes first setting in the software to automatically turn on the vacuum assist eductor.

If you do not have a vacuum assist installed on your machine try this:  Ensure the "Abrasive on then jet" is set in the jet setup screen and change the settings so your abrasive comes on about .6 seconds before the jet fires. Next replace the abrasive metering disc to a .154 size.  Finally, set your pump low pressure to 15K or lower and select pierce all holes first.  After you have pierced all holes, replace the metering disc to your normal disc size, set your pressure to your normal high pressure and re-run the program normally.  This takes much longer to do than using a vacuum assist and may not be perfect but should get the job done.

Happy Cutting!

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sailwa66


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Adding to what Jake said, lengthen your lead-ins so if it does chip, it does so completely on the drop.

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Spruk805


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You can also try 120-220 mesh media.

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jake 123


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Im having trouble with calibrating our vacuum assist, We had it installed by flow but the calibration guage didnt work so we had to wait for a new one. Once had arrived i attached the guage to the abrasive inlet port but i am unable to adjust the vacuum level. So its still blowing chunks out of foamalux. Any solutions will be appreciated.

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jake
TFabian


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I know there are some Flow Applications guys on here, I'm guessing they know the ropes on it and will chime in.

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kellyhofer


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In our shop we usually have lead in's from the outside of the glass sheet. That guarantees no chipping.

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LabradorBob


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another way i pierce glass successfully ,and it is a timed technique, is to turn the pump off, open the nozzle to drain the pressure off the cutting head.

setup your zero point to cut,start the pump from the controller and hit the button to start the cutting.

The object being to pierce as the pump is just beginning to build pressure,usually in low first.

Pierce time can be increased to get a bit longer pierce position.

I have great success with this,but would be slow to pierce several holes.



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Waterjet Group -> Tips and Questions -> Chipping Glass
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