origin of the diamond toolholder.

[J Tiers]

Picked up a 100+ year old shop book at a sale. One of the illustrations was a diamond toolholder. Very much the same as the modern one that is advertised (or used to be, seems to be gone now). Showed a square cutter held at an angle to form a diamond face, ground flat.

Angle was such as to allow the cutter to be a 60 deg threading cutter.

I had thought these were relatively new...... But there it was in a 100 year old book, represented as already a well-known item.

[John Stevenson]

Yes the tangential tool holder.
I believe there is some guy in Oz with a web page selling these for silly money as a new invention.

If you do a search in Model Engineer it crops up at various points in the history of the magazine.

Here's a link to the index for the last 108 years.

http://www.colinusher.info/Indexes/meindex.html

.

[Rich Carlstedt]

It was also advertised in a 1893 issue of
American Machinist
makes it at least 114 years old.
Some ideas never die !

Rich

[Lew Hartswick]

I did some playing around with the idea / design and posted some of the
results at http://home.earthlink.net/~lhartswick if anyone is intrested.
...lew...

[Weston Bye]

I saw someone selling them at NAMES. Bay-Com, I think.

[japcas]

Bay Com does sell them and they had some of them at the NAMES show. I ordered one about a 2 years ago and I like it a lot. It cuts very well and is very easy to sharpen and hone. You can rough or do finish work with it also.

[lane]

Had one for a few years they work good . And with a piece of 1/4 square carbide they are even better.

[franco]

http://www.eccentricengineering.com.au/

franco

[John Stevenson]

http://www.eccentricengineering.com.au/

franco

"This is a unique patented versatile tool designed to work with small to medium lathes for the professional. home hobbyist and model engineers."

?? How can you get a patent on past art? Bull**** or what ?

.

[wbleeker]

I thought the same thing about the patent BS, a couple of years ago I was at our local college doing a baking course ( for our business) learning how to make all sorts of things that make you fat! Well MacDonalds over here stated advertising Kaiser Rolls with one of their products and they had their little TM beside it, for those of you who don't know a Kaiser Roll just has a pattern in it like a swirl and all you do to get the pattern is push a cutter into the dough before you prove it (let it rise before baking).
I spotted the ad on TV with the TM bit and asked my teacher how do you think they got away with that? He had no idea but I think he made some inquiries through the baking industry and the TM bit disappeared quickly!
Will