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Potts Drill Grinding Jig

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Michael Gilligan21/03/2016 07:27:48
8829 forum posts
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Posted by Clive Foster on 20/03/2016 22:50:52:

I seem to recall a mention by Hemingway, possibly in one of their catalogues, that the geometry of the sharpener produced from their castings had been verified by Professor Hugel.

.

**LINK**

Steven Vine21/03/2016 09:03:48
282 forum posts
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Posted by Michael Gilligan on 21/03/2016 07:27:48:
Posted by Clive Foster on 20/03/2016 22:50:52:

I seem to recall a mention by Hemingway, possibly in one of their catalogues, that the geometry of the sharpener produced from their castings had been verified by Professor Hugel.

.

**LINK**

Hi Michael

I have the set of PDFs by J Hugel. Only one of the files mentions the Potts The file set appear to be still available over on the Quorn users group, but there is one or two missing there (they are in the Files section). I don't know if they are copyrighted at all, else I would place them here.

Steve

Neil Wyatt21/03/2016 11:51:22
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I have been sent a copy of the pdf, and am checking to see if we can put it on this website.

Neil

Neil Wyatt21/03/2016 11:57:09
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Jörg was showing a demonstration of drill grinding on the Quorn at MEX 2014. This was part of his exhibit on the SMEE stand.

Neil

tools at mex (37).jpg

Jss08/06/2016 16:38:23
8 forum posts
10 photos

In MEW issue No. 241, on the contents page, there is a reference to J Hugel's drill grinding tables being available on this website. Does anyone know where they are as I can't seem to find them?

John.

Roger Head09/06/2016 07:56:49
206 forum posts
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Jss, not sure if this is what you are after. There are several pdf files and 18 XLS files on the QUORN_OWNERS group at:

https://groups.yahoo.com/neo/groups/QUORN_OWNERS/files/Analytical%20methods%20by%20J.%20Hugel/

Roger

peak409/06/2016 21:46:44
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163 forum posts
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Posted by Jss on 18/03/2016 15:06:08:

Peak4, did you manage to sort your problems? I have the set up instructions if you're still looking for them. Can someone who has one of these tell me where I'm going wrong?

John

John, sorry for not replying, I've only just re-found this thread now that it's been rejuvenated. Been having a rather busy time tying up my Dad's estate and trying to purchase a new house ourselves, so sharpening drills has been rather on the back burner.

A set of instructions would be appreciated for the Potts, along with a photo/diagram of what the drill locating detent should look like. I've tried a variety of shapes and sizes, but the issue seems to be;

A detent which sticks up far enough to locate a 1/2" drill, fouls the flutes of a 3/16" one.

Similarly a shorter detent for a 3/16" drill doesn't stick up far enough for a large drill..

The cheapo Picador style, die cast monkey metal, ones have an adjustable detent to allow for this, but my factory made Potts one has a fixed detent held in place by a 7BA screw. I can't imagine one is expected to have a box of different detents, so I must be missing something somewhere.

On the up side, it does seem to give a good sharp even drill, but with rather too much relief.

Regards

Bill

p.s. does anyone know how to configure a permanant signature on this message board?

Björn Bursell14/06/2016 17:24:52
5 forum posts

Made one this last winter

**LINK**

peak414/06/2016 21:02:36
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163 forum posts
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Posted by Bj�rn Bursell on 14/06/2016 17:24:52:

Made one this last winter

**LINK**

Looks like it makes a nice job of the sharpening, but unfortunately that's the only photo on that thread that I can see.

Any chance of a pic of the location detent on the business end?

Many thanks, and welcome to the forum

Bill

Björn Bursell17/06/2016 16:54:22
5 forum posts

Guess you need to be registered to wiew the rest of the photos...

The plans don't really give a good clue as how advanced the front end should be in respect to the pivot point where it intersects the platform. went for the conclusion that a zero diameter drill would be ground at a zero radius with a zero degree relief angle..

Just took a few photos of the business end, can be found in my flickr album: https://www.flickr.com/photos/139032632@N06/albums/72157664126081755/with/27730070505/

 

 

Edited By Björn Bursell on 17/06/2016 16:57:02

peak417/06/2016 17:33:38
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163 forum posts
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Thanks Bjorn, much appreciated. I remembered I has an account with that forum and re-set my password.

Pretty much the same as my original one, but I was finding that the spring steel detent on mine was catching on the core of the flute on small drills, if the detent was long enough to set 13mm ones.

Can't get your link to work yet, maybe it's still uploading.

Cheers

Bill

Björn Bursell17/06/2016 18:01:32
5 forum posts

Hm.. this link works maybe?

**LINK**

peak418/06/2016 15:12:41
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163 forum posts
10 photos

Thanks Bjorn, much appreciated.

For some reason, your Potts album wasn't showing previously. I may have been too quick off the mark and tried to view it whilst you were still uploading it.

The link in your earlier post now works fine. smiley

I'll have another go at making a detent later on and see how I go.

 

All the best

Bill

Edited By peak4 on 18/06/2016 15:12:49

Edited By peak4 on 18/06/2016 15:13:40

Jss20/06/2016 17:05:28
8 forum posts
10 photos

Hi Roger/Bill, my apologies for not responding sooner. I tidied away the drawings for the Potts jig some time ago and it's take a while to find them. Also this is my third attempt at posting this reply.

Roger I struggle with Yahoo groups. I thought that as I was a member of the Drummond lathe group I would be able to get to the link you posted. Unfortunately not, I have to be a member of the Quorn Owners group as well. If all else fails I'll pursue that. Thanks for posting the link anyway.

Roger here is the detail of the detent as per per the drawing from Wokings:

image.jpeg

As for the instructions:

image.jpeg

Hope these are of some help.

Regards, John.

Roger Head21/06/2016 02:31:58
206 forum posts
7 photos

John, if you pm me your email address I will send you a copy of the pdfs.

Roger

Neil Wyatt11/01/2017 09:05:44
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8519 forum posts
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My apologies, I have just realised that I never uploaded Joerg Hugel's corrected PDF and spreadsheet.

You can now find them here:

Drill Grinding Geometry.

Neil

Michael Gilligan11/01/2017 09:27:18
8829 forum posts
391 photos

Thanks, Neil

PDF copied to the iPad yes

... but the Excel plots look a little sparse in their calibration.

... will have a look on the Mac, later.

MichaelG.

Tractor man11/01/2017 20:05:22
150 forum posts
102 photos
I have the drawings and set up instructions somewhere if ypu still need them. Mick

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