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For you machinist out there...
Posted: Oct 31st, '11, 10:26
by CaptPatrick
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DIJET Wesite
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Posted: Oct 31st, '11, 10:39
by Brewster Minton
New meaning to a square peg in a round hole.
Posted: Oct 31st, '11, 15:27
by Harry Babb
Now being able to drill a square hole....ON PURPOSE.....opens up a whole new world! ! !
I am the king of drilling a triangular hole with a round bit! ! ! LOL
Several years ago I had to make some parts and supply Socket Head Cap Screws with the order.....these bolts were 1'' thread size and made of XM-19.....due to the alloy I had to have them custom made.
I found a place in South Florida that could produce them. I thought the "Hex" had to be Hot Formed, but when they came in it was obvious that they had been machined......blew my mind.......no significant radius in the corners either.
I am thinking that if these guys can do a Square hole they probably can do a Hex hole.....
Good one Capt
hb
Posted: Oct 31st, '11, 16:55
by Carl
Harry,
You can do a Hex, Spline, Key, Square pretty much any shape with a Wobble Broach in the lathe, mill or even a drill press.
Real simple tool in theory, Cutter looks like a punch with a sharp concave face, and a good deal of draft. Cutter goes into a head and tool bit spins freely with the work, the head is offset. After you have hole to spec you introduce cutter to hole and as tool spins with the piece, the front face cuts/ shears the shape. Works pretty good...although the heads are pricey and tools are not cheap, but with the right job...
Capt Pat that is a pretty cool clip.
Wanna see something mind blowing...at least to me it is. I understand how it works yet it still escapes me how its done. After the 2 minute mark is where it gets interesting
http://www.youtube.com/watch?v=FfPGGVceO6g&NR=1
Posted: Oct 31st, '11, 17:29
by randall
that is cool......usually i can visualize how things work....this time time....not so much.
Posted: Oct 31st, '11, 17:38
by ianupton
This might help.
The bit does not rotate on its' center, and the corners of the square are not really squared off.
From Wikipedia - "The Harry Watt square drill bit has the shape of a Reuleaux triangle and can, if mounted in a special chuck which allows for the bit not having a fixed centre of rotation, drill a hole that is nearly square."
Ian.
Posted: Oct 31st, '11, 18:55
by Capt.Frank
Amazing.
Posted: Oct 31st, '11, 22:42
by mike ohlstein
Saw it done many years ago, but you still had to clean up the corners.
You can draw a cross section of the drill bit pretty easily.
Draw any line. Use a compas to span the length of the line, and then use it to draw an equilateral triangle. Put the point of the compas on any corner and scribe the arc between the other two points. Repeat for the other two points. Have Harry mill up the bit, and put it in a wobble chuck.
Of course some folks can drill square holes with a standard drill bit, but most of us would call that wallerin'......
Posted: Nov 1st, '11, 10:01
by Rawleigh
Square drilling has been around since the turn of the century. Those old guys were pretty smart.
Harry: Google "Rotary broaching" and you will see how they may have done it. Any shape you want! Tool stays stationary to the work and the rotation of the chuck makes it wobble to do the broaching.
http://www.youtube.com/watch?v=gUEcagEmmZo
It also works on a mill and you can really see the wobbling action.
http://www.youtube.com/watch?v=uTsPXFy7 ... re=related
Posted: Nov 1st, '11, 21:51
by coolair
That is awesome. there are way to many cool things i know way to little about
Posted: Nov 2nd, '11, 16:58
by scot
I believe they call that a Mazda Rotary (Wankle) engine.
Posted: Nov 2nd, '11, 19:08
by Harry Babb
Several years ago a guy came in the shop and need a bearing pressed off of a shaft.
This shaft was part of a Gear Reduction that he used on his barge and tug.
The inner workings were eccentrics, plates, and pins that would act as a gear reduction and would not free wheel at all.....there was not the first gear inside of this thing and looked as like a very simple device.....but had some pretty complicated geometry.
for the life of me i cannot remember the name of the reduction or the manufacturer.....From what i remember he told me it was not very expensive.
It worked on what looks like the same principle as the square drilling hole.
I know the description is rather vague....but have you guys ever ran across a gear reduction like I tried to describe??
hb
Posted: Nov 3rd, '11, 07:36
by jspiezio
Posted: Nov 3rd, '11, 17:33
by Harry Babb
Well Joe I got real curious also and could not get it out of my mind.....so I did a little digging and found what I am talking about.
Take a look
http://www.youtube.com/watch?v=YRATbJs6 ... re=related
http://www.youtube.com/watch?v=EFni742p ... re=related
hb
Posted: Nov 3rd, '11, 21:16
by jspiezio
Wild stuff!
Posted: Nov 3rd, '11, 22:04
by BCBertie
Man, that is beautiful. There is genius in this world...