Tapping acrylic (plexiglas, methyl methacrylate) - diyAudio
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Old 21st September 2006, 05:30 PM   #1
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Default Tapping acrylic (plexiglas, methyl methacrylate)

saw this on Machine Shop Swarf -- when tapping plexi do not use alcohol or cutting oil -- instead use water with a little dissolved soap or detergent -- the user had observed that even small residual amounts of solvent resulted in "crazing" and spider cracks radiating from the tapped hole if alcohol or cutting oil were used.
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Old 21st September 2006, 09:43 PM   #2
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I've used plain water as a coolant/lubricant when milling acrylic, and it works very well.

For tapping, I usually tap dry, and slow.
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Old 21st September 2006, 09:47 PM   #3
poobah is offline poobah  United States
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Good ole' animal lard is still used as tapping lube for some plastics and metals... always worth a shot.

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Old 21st September 2006, 10:24 PM   #4
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Quote:
Originally posted by poobah
Good ole' animal lard
Is chewie fat a good one?

dave
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Old 21st September 2006, 10:32 PM   #5
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Poo

I am probably the only person on DIYAUDIO (at least stateside) whose families members actually rendered the poor little lambies (within my own lifetime). anyone else know how to make lanolin?

Click the image to open in full size.
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Old 21st September 2006, 10:33 PM   #6
poobah is offline poobah  United States
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Boy, how I wish it were that easy... You guys would be tapping up a storm... I could recoup some foolish investments... and look and feel to better to boot!

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Old 21st September 2006, 10:35 PM   #7
poobah is offline poobah  United States
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Damn.. that's cool lookin' Jack. Are you a Flyer?

Oh yeah... lard, lye, and fire,... right?

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Old 22nd September 2006, 01:31 AM   #8
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Quote:
Originally posted by jackinnj
anyone else know how to make lanolin?
I don't know about making it, but it sure is a pain to wash out of the wool i get from the old sheep's home.

dave
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Old 22nd September 2006, 03:26 PM   #9
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The hot setup for any machining operation in plexi is one of the spray cleaners... either Formula 409 or Fantastik. Back it up with a dead sharp tool and you have a winner.
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Old 22nd September 2006, 05:43 PM   #10
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I use one of the generic glass cleaners, blue liquid in a spritzer bottle like Windex. Blow out after tapping with compressed air.

Yes, stay away from alcohol, it will craze some plastics like plexy in a zillion tny cracks. A real mess.
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