Member postings for Rubin

I have only just realised that the Jig Van Royen describes is actually a "worcester" drill grinder made in the USA. Somewhere along the line the design seems to have been actually ascribed to Van Royen, at least that is the impression I have been under. Below is a more industrial version from 1907.

1907 Image-Washburn Shops, Universal Twist Drill Grinder

Marcus,

Looking on the net I saw that "Stephen A. Morse" patented the twist drill in 1863, but It didn't

become widely accepted until the advent of high speed steel. But it must have had a fairly sensible

tip geometry in that first patent. But it probably wasn't worth spending a huge amount of time with

exotic geometry if it turned to mush quite quickly.

HSS was patented in 1910.

If the above is true, then Van Royen (1865-1946) is pretty close to the beginning.

The fact that his article was "published" in 1913, and he must have been working

on the problem for some time before being published.

Just some guesses...Tim

Hi Marcus,

I do actually already have Hugel's pdf files & xls sheet, but thanks for the tip.

It was the fact that Hugel left out the potts caliper angle from the paper

that originaly piqued my curiosity, but his 3D cone and parabola view

are beyond my ability to internalise. However I found Van Royen's comment

about viewing the "grind" with a stationary drill and rotating grinder very helpful.

(Much like peeling a potato)

Mattew J. Russel's paper (link below) pretty much nailed the sliding offset

question for me. ( I found it a very lucid explanation.)

http://wiki.vintagemachinery.org/(S(x0441pyeb030jg45asaohr45))/GetFile.aspx?File=%2FDrillPresses%2FDrillSharpening.pdf

I am still digesting at the moment and probably will be for sometime, but i'm

starting to come to the conclusion that there is no such beast as a perfect cone

grind, but if all of the angles & offsets remain adjustable a useful lookup table

could be created for a number sizes and situations.

Regards.. Tim

Hi Paul,

You are a scholar and a gentleman, and I couldn't be more pleased.

Thank you very much, I really appreciate the photo's.

Best regards... Tim

Hi People,

I have been looking for the article by L.A.Van Royen

published in The Model Engineer on 14th August 1913,

Volume 29 - issue 642 - Page 153

I've been trying for years to get a copy from eBay

or digital copy from M.E. all to no avail.

All I want to do is read his article and see what he actually said, as

he's always being referenced, quoted and interpreted.

If anyone has the article and could email me some photo's or scans of it

I would be really greatful.

With thanks... Tim