What is Digg?83 Comments
- afex, on 10/12/2007, -1/+228look at the nice rounded corners, must be a drill2.0
- canadianguy33, on 10/12/2007, -0/+220That's pretty cool but kind of a long read considering the concept can be explained a lot better with a simplie animated gif like so: http://mathworld.wolfram.com/ReuleauxTriangle.html
- falstaff, on 10/12/2007, -2/+32Animation is nice, but somebody needs to get a video on YouTube of one of these bits in action.
- conedude13, on 10/12/2007, -1/+30I second that. Doesn't anyone watch The New Yankee Workshop anymore? (Shout out to my man Norm!)
- sonik3, on 10/12/2007, -0/+26I don't know about all this math. How about just using a mortising bit on a drill press... http://en.wikipedia.org/wiki/Mortiser
- ostracize, on 10/12/2007, -0/+25Looks like Spirograph!
- Mootabolife, on 10/12/2007, -1/+23Your links was much easier to grasp. Especially considering the original page is dead.
- nthpro, on 10/12/2007, -1/+22Math...Early...Morning....Brain...Ow.
- crawfishsoul, on 10/12/2007, -1/+21"early" is in the eye of the hung-over.
- negativefx, on 10/12/2007, -2/+22Anyone with a spirograph already knows this!
edit: damn, ostracize beat me to it. hey ostracize: wanna come over and play spirograph with me? - inactive, on 10/12/2007, -1/+20There are two flaws with this idea which is probably why most pros use mortising bits or broaches.
1. Not easy to center the bit or line it up squarely since there is not a center point on the bit
2. While it removes most of the material in a hole, it still leaves remnants in the corners that would have to be chiseled or broached out, something that a mortiser or broach does in one pass.
In short, there are reasons that we don't see these in mass use. - ij00mini, on 10/12/2007, -1/+20You really don't need to sign off with your name (as noted in the last story you posted in...)
- Roger, on 10/12/2007, -4/+21No.
- anti_hax0r, on 10/12/2007, -1/+17You mean Wankel or rotary engine. Renesis is a brand name like Kleenex.
beat by NSMike - bleonard, on 10/12/2007, -1/+15Renesis Engine.
- stevievep, on 10/12/2007, -1/+15That *was* pretty cool...I enjoyed the inclusion of the math to reaffirm that people can still think in these terms.
- IEatHamburgers, on 10/12/2007, -2/+16Now I have a use for all those round pegs I had lying around in my basement.
- Ghost_MH, on 10/12/2007, -0/+12You have people that click on the "digg it" button to the left of the article title. After a number of people click on this button, the article then gets promoted to the front page of digg. This whole social web 2.0 thing is amazing =p
No matter...This was actually pretty cool. I've never heard of this and I would love to see it in action. It's not exactly new, but new enough to me and it left more than a few people over here in the office scratching their heads at the idea. I digg. - Odiwan, on 10/12/2007, -0/+11Thanks, your link was just so much easier to grasp. After reading through all those equations in the original link, my lunch hour was over.
- trylleklovn, on 10/12/2007, -0/+11So what desides where the corners go?
- NSMike, on 10/12/2007, -1/+11Same concept as the rotary combustion engine in the Mazda RX8, for those unfamiliar with the term Renesis.
- monkeyrobot, on 10/12/2007, -1/+10wankel it is
- SgtBeavis, on 10/12/2007, -1/+10Because a mortising bit generates more heat, can get stuck in the wood stock, tend to break the drill bits on occasion, and utilize the chisels to take out a much larger percentage of the wood stock than something like this would. Mortising machines also tend to require a significant amount of elbow grease which is why they have long levers. A bit like this would allow the machine to do more of the work. How many times have woodworkers been coached to let the machine do the work?
Honestly I would love to use my drill press with a bit like this than have to use my Jet Mortising Machine. - NSMike, on 10/12/2007, -0/+7Dude, you suck. It makes it because it's cool.
You have that attitude because you either:
A. Didn't know about how something like this could work, nor do you care (in which case you should take a moment to not waste your time being a troll), or
B. You consider yourself a supernerd who knows all and is commenting in this way to belittle those of us who are interested in learning something we didn't know before.
Now go away and hide under a rock. - sacherjj, on 10/12/2007, -0/+5It looks like the drills almost square holes. You would still have to round over the edges of the tenon going into a mortise. It would be difficult (read: expensive) to make a bit that doesn't have a great deal of runout when drilling this hole, because of the moving pivot point, unless you are doing very large holes. I'll stick with my mortiser.
- inactive, on 10/12/2007, -0/+5I have never found the need for a square hole.
Oh I am sure there are uses.. just all my screws are rounded - LiquidPenguin, on 10/12/2007, -2/+7I don't know why the original poster was dugg down. Anybody with any inkling of carpentry skills would know about this bit. You would think all the guys hacking together plexiglass boxes for their custom rigs would be aware of it. SgtBeavis's point is excellent, but it doesn't escape the fact such a bit exists. And from the tone of the article, it sounds like the article writer have never heard of such a thing.
Conceptually, this is interesting math. Might even have practical use in some field in the future (if it doesn't already).
But then again, this is Digg. A lot of people with a lot of opinion, and not enough people with solid knowledge. - willis77, on 10/12/2007, -1/+4exactly, 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. - crawfishsoul, on 10/12/2007, -1/+5Also called rotary broaching. Get your square hole drill bits here fella's!
http://www.slatertools.com/rotarybroachingtools.htm - lustre, on 10/12/2007, -0/+4Or an epitrochoid enclosure.
- inactive, on 10/12/2007, -0/+3@trylleklovn
A few possible methods.
the first is to set one part of the triangle in one corner of the square. The bit will naturally follow that pattern although I would imagine that it is difficult to line up perfectly. An alternative to this would be to chisel out a square for it to start in.
http://www.integerspin.co.uk/polygon.htm
The second would be to have a following template (read as: a metal square mounted above the workpiece that the bit rotates within)
A final method would be to use a cnc and have the computer control the placement of the bit. Most newer machines can do advanced bit placement in 3d and change those coordinates as the spindle rotates. In that case all that would be necessary would be a tringular bit. However there are much simpler ways to make a square hole than to use one of these bits. (router with a broach, laser cut, water jet, drill bit with broach)
Another point to consider is that the cutting angle of the bit changes as it rotates, so it is not an optimized way to cut. Most tools have a cutting angle that is most efficient, and I would imagine that the varying angle of these tools would be hard on the cutter. - tripm, on 10/12/2007, -0/+3Jeeze, Norm "the caapenda" showed us these bits years ago on The New Yankee Workshop, except the bits he uses are just traditional round bits housed in a very sharp, square chiseled sleeve.
- Kinmar, on 10/12/2007, -1/+3The Renesis Engines rotors rotate inside a oval rather than a square.
- MistressRoninS, on 10/12/2007, -0/+2Spiro-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..
- willis77, on 10/12/2007, -5/+7the best we can collectively do to these people is keep the post at exactly +1 digg.
modded up means we like what you say
modded down means we dislike what you say
+1 digg means nobody cares about your post - krinthekuz, on 09/16/2008, -0/+2and the material's strength would have an effect on the curvature as it would resistance to the bit. i've always done square holes just by using a drill and then a jigsaw, and i'd beautiful squares in no time.
- ebcreasoner, on 10/12/2007, -1/+2You mean square pegs
- kjinx, on 10/12/2007, -0/+1This is fascinating. I enjoyed the very well done mathematics explanation on the Wolfram site ... that said ... when I want to drill a square hole I use this
http://en.wikipedia.org/wiki/Mortiser
which I have in the garage :-) - z0iid, on 10/12/2007, -0/+1every try to fit a square peg in a round hole?
- beerfart, on 10/12/2007, -0/+1..or use a wire EDM
- joesmeat, on 10/12/2007, -0/+1You mean Wankel rotary engine. Renisis is just a particular model.
It's like saying RB26 engine instead of piston engine. - etx313, on 10/12/2007, -1/+2Looks like the rotor from a Mazda RX7!
- dangsta, on 10/12/2007, -0/+1kinda reminds me of a rotary engine
- aussiebuddha, on 10/12/2007, -0/+1Yup, Same thing as the cylinder of a rotary engine.
- anagoge, on 10/12/2007, -1/+2Personally, I enjoy screwing, rather than drilling.
- Redchannel, on 10/12/2007, -0/+1Too hard, too much math.
- willcode4beer, on 10/12/2007, -0/+1my school had either college prep OR shop
the shop classes were taught by the local tech school
so, if you were planning on college, you never got exposed to it. - klitscher, on 10/12/2007, -0/+1@SgtBeavis: Why don't they make the mortise bits have the Watt Drill bit inside of them instead of a standard round bit? Seems like it solves the biggest problem with each of them...the mortise chisel would clearly define the outer edges of the hole, eliminating the problem of having no center point, and the mortise chisel would not need so much elbow grease as the bit would remove more material than a round one.
- Niro, on 10/12/2007, -1/+2Yup canadianguy33, pretty much said it clear enough !!!
- strangeless, on 10/12/2007, -1/+2@ 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. -
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