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Thread: drilling perspex.
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18th August 2007, 09:51 AM #1
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drilling perspex.
I read in another thread that when drilling through perspex you should "put negative rake on the drill's cutting edges". Can someone explain what this means. Cheers.
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18th August 2007, 10:33 AM #2
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This link probably explains it better than I could (has a pic too), go down to the section on dubbed drills.
http://www.mmsonline.com/articles/068901.html#fig5Dan
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18th August 2007, 04:39 PM #3
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Fantastic link, Dan, a really good analysis of the topic. Thanks
The beatings will continue until morale improves.
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18th August 2007, 05:13 PM #4
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Thanks for the link Dan. Have filed that one away.
Reality is no background music.
Cheers John
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18th August 2007, 05:26 PM #5
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Dan
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19th August 2007, 08:38 AM #6
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Having just blown out the bottoms of two acrylic pen blanks, despite having a brand-new sharp bit, and drilling slowly, and clearing the bit frequently, I googled "drilling acrylic".
Seems much like what you're looking for:
http://www.bertram31.com/proj/tips/drill_acrylic.htm
http://www.hawkfish.org/snailman/acrdrill.htm
http://www.sdplastics.com/acrylic.html
http://www.ultimatehandyman.co.uk/AC..._MACHINING.htm
I also wondered about using a masonry bit, as they seem to have zero rake...
Anyone tried that?
Cheers,
AndrewLast edited by arose62; 19th August 2007 at 08:40 AM. Reason: New website found
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24th September 2007, 06:06 PM #7
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Enjoyed reading the Drill Point Geometry article linked to above, here is another link to a longer version of the article, for others interested loike moi.
Cheers.................Sean
The beatings will continue until morale improves.
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