Drill Sharpening using the Quorn

[Johs- Line 1Participant @johs-line1]

[Johs- Line 1Participant @johs-line1]

DAG Brown had a good series about sharpening drills by the 4 and 6 facet method. Later on he developed a better way (I think) to grind a drill. I can not find this artikel. Can anyone point me to the right M.E. number?

Thanks.

[EmgeeParticipant @emgee]

Posted by Johs- Line 1 on 14/12/2020 13:24:12:

DAG Brown had a good series about sharpening drills by the 4 and 6 facet method. Later on he developed a better way (I think) to grind a drill. I can not find this artikel. Can anyone point me to the right M.E. number?

Thanks.

An article by Derek Brown appeared in Model Engineer issue #4025 describing some additional jigs for the Quorn to facilitate "6 facet" sharpening.

Emgee

Volume 177, Number 4025, 20 Sep-3 Oct, 1996, p313.

Edited By Emgee on 14/12/2020 14:02:31

[Johs- Line 1Participant @johs-line1]

Thanks Emgee.

Yes, I have that article, but he had a later article on grinding drills using the same equipment.

Johs.

Edited By Johs- Line 1 on 14/12/2020 14:07:35

[peak4Participant @peak4]

Is this article on Model Engine News of assistance.
http://modelenginenews.org/meng/quorn/drilljig.html#fn

Personally I've been using the 4 facet method described in the Footnote.

I didn't build my Quorn myself, and wasn't able to achieve the 31° angle due to various bits fouling each other.
I recently bent a bar by 20° to hold the head at an angle; I'd intended 10° but got carried away.

Bill

[Johs- Line 1Participant @johs-line1]

I think grinding the drill is named "step rake". Anybody know the M.E. volum the article by Drown appeared?

Johs

[peak4Participant @peak4]

It's difficult for me to find myself, as I'm not familiar with the article, but you may well find it mentioned on the Quorn iO group HERE

https://groups.io/g/Quorn-Owners

Bill

[Johs- Line 1Participant @johs-line1]

Yes, I found it!

"Further developments in drill sharpening" by D.A.G. Brown. M.E. vol 215 No 4513 page 184.

This is a superior way to grind a drill. Try it!

Johs

Edited By Johs- Line 1 on 15/12/2020 17:55:10

[Howard LewisParticipant @howardlewis46836]

Originally, I wanted to make a Quorn, but it looked so complicated that I opted for a second hand only just started Worden.

Most of the time it is used, with a Hemingway kit, (plus my own accessories&nbsp for 4 facet drill grinding.

Reading the recent MEW reprint of Giles Parke's article on 4 facet grinding, I realised that using ER collets to hold drills for grinding was, like mine, one of his techniques.

It is also used for grinding lathe tools, (HSS and with a diamond wheel Carbide ) and have even been brave enough to try sharpening a couple of end mills.

The Worden is a less complicated machine, and so less versatile, than the Quorn, but is easier to make, and the accessories are simpler. So it satisfies my minimal needs.

D A G Brown makes a superb, and quick, job of 4 facet grinding on his Quorn, when you see him in action.

Howard

[Johs- Line 1Participant @johs-line1]

Quote: "However I seem to remember that amongst much commentary and even the book itself that the Quorn does not actually sharpen drills"

On page 113-114 in the Quorn book it is all explained. (4 facet method).

Johs

[peak4Participant @peak4]

Posted by Howard Lewis on 16/12/2020 09:51:43:

…………………..

Reading the recent MEW reprint of Giles Parke's article on 4 facet grinding, I realised that using ER collets to hold drills for grinding was, like mine, one of his techniques.

………………….

Howard

Howard, which edition was that in please?
I still have quite a pile of unread subscription copies.

I've just started the journey of tidying up me workshop, now it's relocated from a house move; current project is a full drill set re-sharpen of everything that needs it.
I've started at 7/8" and working down, from the MT2 to MT1 drills

For these larger sizes I'm using a No2 Reliance, which works well to provide the conventional conical rake; I'll swap to the No2 Reliance and maybe the genuine Picador as the size decreases.

Maintenance of 10mm and below, I've more recently been using the 4 facet method on the second hand Quorn I bought a while ago. I use J.Hugel's method for that, which seems to work well.
I linked to it earlier.

Bill

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