upper.us.edu — A bit that drills square holes ... it defies common sense. How can a revolving edge cut anything but a circular hole? Not only do such bits exist (as well as bits for pentagonal, hexagonal and octagonal holes), but they derive their shape from a simple geometric construction known as a Reuleaux triangle (after Franz Reuleaux, 1829-1905).
Nov 30, 2006 View in Crawl 4
willis77Nov 30, 2006
exactly, the description misleads:"it defies common sense. How can a revolving edge cut anything but a circular hole?"a centered, revolving edge only cuts circular holes, as intuition suggests.
anagogeNov 30, 2006
Personally, I enjoy screwing, rather than drilling.
zidulNov 30, 2006
My african skull is too think to understand this. could someone make it simpler?
ebcreasonerDec 1, 2006
You mean square pegs
strangelessDec 1, 2006
@ willis... I thought that was the point of the comment digging system... I've been doing that from the very beggining. Here's my method: someone has +1 that means (on the surface) no one has agreed or disagreed, leave it alone. someone has -1, well that person should really have a 0, to make a nice round number. someone has more than +5 well nothing really can be gained here, leave it alone. someone has -4 one more to be below the default threshold!! thumbs down. someone has -5 or less, well at that point I just jump on the bandwagon and thumbs down. hopefully many people will and the commenter will post later saying why did you digg me down I had a valid point? And then you can digg down again and it stays funny. [edit] well obviously any time you can get them back to +1 it is a bonus.Tell me if this was not the intended result.
mistressroninsDec 1, 2006
Spiro-graphs were to expensive when I was a kid so we jerry rigged some other circular things like parts from toys and drew circles inside of plastic gears with a marker instead..
redchannelDec 6, 2006
Too hard, too much math.
qchessFeb 21, 2008
This video lets you see how to make a square hole: <a class="user" href="http://www.slatertools.com/video.htm">http://www.slatertools.com/video.htm</a>
polygonsolutionMar 19, 2011
This process is called rotary broaching. You can learn more about the rotary broach process here: http://www.polygonsolutions.com