View Full Version : drilling perspex.
mako
18th August 2007, 09:51 AM
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.
Dan
18th August 2007, 10:33 AM
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#fig5
scooter
18th August 2007, 04:39 PM
Fantastic link, Dan, a really good analysis of the topic. Thanks :2tsup:
munruben
18th August 2007, 05:13 PM
Thanks for the link Dan. Have filed that one away.:2tsup:
Dan
18th August 2007, 05:26 PM
:google2:
arose62
19th August 2007, 08:38 AM
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/ACRYLIC_DRILLING_MACHINING.htm
I also wondered about using a masonry bit, as they seem to have zero rake...
Anyone tried that?
Cheers,
Andrew
scooter
24th September 2007, 06:06 PM
Enjoyed reading the Drill Point Geometry article linked to above, here is another link (http://www.newmantools.com/machines/drillpoint.html) to a longer version of the article, for others interested loike moi. :D
Cheers.................Sean