Milling A Square Hole

D

DScott

Member

• Oct 31, 2011

• #1

I have never seen this before. Pretty clever.

http://smg.photobucket.com/albums/v244/tsiya/VIDEO/?action=view&current=ChineseDrill.mp4

 

M

Mike M

Well-known Member

• Oct 31, 2011

• #1

I see it and I still don't believe it ?

That is pretty neat. I suspose the Chineese thought of it ?

 

O

oldtanker

Well-known Member

• Oct 31, 2011

• #1

(quoted from post at 07:04:21 10/31/11) I see it and I still don't believe it ?

That is pretty neat. I suspose the Chineese thought of it ?

Click to expand...

Pretty clever but if the Chineese are doing it I'd bet they are just copying someone else.

Rick

 

A

Anonymous-0

Well-known Member

• Oct 31, 2011

• #1

What do you mean suppose ?
looks like Chineese writing to me...

 

O

oldtanker

Well-known Member

• Oct 31, 2011

• #1

It means that while the Chinese are very industrious coming up with cutting edge (pun intended) technology is not their strong point.

Rick

 

O

ohiojim

Well-known Member

• Oct 31, 2011

• #1

those other countries have the best technology they can steal from us....

 

B

big fred

Well-known Member

• Oct 31, 2011

• #1

Nothing new here. It's the same concept as the Harry Watt square drill that's been around for decades. Patented in 1917 or thereabouts.

 

B

big fred

Well-known Member

• Oct 31, 2011

• #1

Patent info here
patent 1241176 Sept 25 1917

 

3

37chief

Well-known Member

Location

California

• Oct 31, 2011

• #1

Looks like it takes a special machine also. When I needed to mill a square hole I would use a small cutter for the sides and dril out the corners. Stan

 

3

37chief

Well-known Member

Location

California

• Oct 31, 2011

• #1

Looks like it takes a special machine also. When I needed to mill a square hole I would use a small cutter for the sides and dril out the corners. Stan

 

G

Gun guru

Well-known Member

• Oct 31, 2011

• #1

I use a square broach.
Drill a pilot hole first.

A High speed steel broach is waaaay cheaper than that contraption.

 

J

johndeerefan

Member

• Oct 31, 2011

• #1

It takes a special machine. The centerline of the bit changes locations as it moves around the square.

 

R

rustyfarmall

Well-known Member

• Oct 31, 2011

• #1

The resulting hole is still not square. A ROUND tool will NOT make a square hole.

Maybe that's why some of the stuff we get from China is inferior, because the Chinese still haven't figured out that a square peg will not fit a round hole.

 

Absent Minded Farmer

Well-known Member

Location

Gehl Country, Wis.

• Oct 31, 2011

• #1

Where do I find one & how are they used? Sounds like I could use one of those to put square holes in the chamber of my baler. Might be cheaper & easier to move than a BF'n punch-press, too.

Mike

 

A

Anonymous-0

Well-known Member

• Oct 31, 2011

• #1

It's not a round tool and is a square hole.

 

D

dave9252

Member

• Oct 31, 2011

• #1

Can't ya just go down the hardware store and get a square drill bit, then theres no need for 1 of them special machines. :twisted: :twisted:

 

R

rustyfarmall

Well-known Member

• Oct 31, 2011

• #1

(quoted from post at 11:55:36 10/31/11) It's not a round tool and is a square hole.

Click to expand...

The 4 corners all have a radius. The radius may be miniscule, but unless you take a flat file to those corners, they are not square.

 

B

big fred

Well-known Member

• Oct 31, 2011

• #1

As a practical matter, it's extremely poor design practice to have a sharp inside corner.

 

G

Gun guru

Well-known Member

• Oct 31, 2011

• #1

You can buy them from a place that sells industrial cutting tools. You will also need an arbor press to push the broach threw the workpiece. Oil the pizz out of the tool and workpiece and start pushing. Be sure to keep it straight and take your time. What size hole do you have to put in it?
Remember to only buy a High speed steel broach, dont get carbide, too expensive and too brittle. I dont think I have ever seen a carbide broach.

 

B

barnE

Member

• Oct 31, 2011

• #1

Saw this years ago in Popular Science, I think. For drilling wood. Dave

 

B

Bob Collins

Well-known Member

• Oct 31, 2011

• #1

Easy enough to Google Dijet and see they are worldwide, including China.

 

H

huntingreen2day2

Member

• Oct 31, 2011

• #1

Not a true square hole. A rotating tool can only
make corners with a radius.

 

F

flying belgian

Well-known Member

• Oct 31, 2011

• #1

It looks square to me.

 

J

JMS/.MN

Well-known Member

• Oct 31, 2011

• #1

If you look at the video closely, it looks like the tool holder is rotating in an elliptical pattern, and thus the tool can get into the corner, cut it square, then retract before the next cutting edge takes a bite.

 

A

Anonymous-0

Well-known Member

• Nov 1, 2011

• #1

Yep, A sharp corner with no radius is a perfect place for a crack to start.

 

F

Fred Martin

Member

• Nov 1, 2011

• #1

Yep, used them in the navy. If I remember right the drill had three flutes and was flat bottom ground like an end mill and it just followed a square guide mounted above it. And for the non-believers, that radius in the corners wasn't much of a radius at all. ohfred

 

3

36 Coupe

Well-known Member

• Nov 1, 2011

• #1

I worked on a plastics injection machine in the 50s that made square push buttons for radios.The die had 6 cavitys that had a dead end.Foreman said the die was very expensive.

 

O

oldironman

Member

• Nov 1, 2011

• #1

I used one of these back in the 60s. We made industrial scales. Worked good.