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1st Feb 2018, 12:34 PM #1Senior Member
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- Jul 2014
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- melbourne
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- 110
gmf- douglas drill grinding attachment instuctions
i was going through some old books of my late father in laws when i found this on the gmf drill sharpener
i have one myself and have found it very hard to find any info on them so hopefully the images will be readable and helpful,interesting to others
cheers all
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2nd Feb 2018, 08:50 PM #2
Hi, dodge at 4.
Many years back, before the advent of the Drill Doctors and similar tools, this type of side wheel grind fixture may have been all the (engineering) people had. I mean by that, those who could not grind their drills freehand.
I saw one- ( I can't say it was a GMF) used in the shop I did the last years of my apprenticeship in, circa late 60's.
I do clearly recall the 2nd class machinist had to sharpen drills up to 2 inches in diameter for use on the large radial arm drill the shop used. To check the grind was correct, the machinist utilised a length of say,1 3/4" s 1/8" flat with a double 90° bend at one end with the last small section coming to a point.
The drill ends with the centre were fitted to the point and on the other ends, the trailing end of each cutting edge was scribed onto the flat bar.If both scribes coincided the drill was deemed ready for use.
General tools also made a smaller but similar one in alloy but mine didn't survive being dropped.
I am not keen on side grinding unless the wheel is specifically made for doing so.
Hopefully, some older members may recall this fixture.
Cheers
Grahame
general-tools-drill-attachments-825-64_1000.jpg
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2nd Feb 2018, 10:16 PM #3Golden Member
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- Sep 2008
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- Riddells Creek, Vic.
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- 831
I have one of those Grahame, my Dad got it years ago and used it only a couple of times. I gave it a go myself once and found it too hard to set up and it gave very inconsistent results.
It's quicker, easier and provides better results to just grind by hand.
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2nd Feb 2018, 10:22 PM #4.
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- Nov 2008
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- Perth WA
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Thank you Dodge for the additional encouragement to get my grinder up and running.
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3rd Feb 2018, 10:26 AM #5Golden Member
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- Oct 2008
- Location
- Cairns, Q
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- 666
Hi Grahame,
I also have a couple of those drill sharpening fixtures - the second one was donated to me for parts but both have been repaired. I still use one occasionally for medium sized drills - 1/4" to 3/4". As Techno says it is fiddly to set up, and, on small drills anyway, can give very inconsistent results. I find it does give more consistent results on larger drills, particularly the reduced shank ones, than I can achieve by hand because I don't get enough practice now. My CBN wheel has a band of abrasive on the outer flat surface, so the potential problems with side grinding on a conventional wheel don't arise.
When I was doing a metal machining course at the Tech in Cairns years ago we used the fixture you describe for checking the symmetry of hand sharpened MT drills with a centre hole in the taper. The fixture would be chalked first so the lip mark of the drill was clearly visible.
Frank.
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3rd Feb 2018, 12:43 PM #6
There was an interesting on-line discussion about these sharpening jig and what needed to be done to improve them.
This resulted in an article by Graham Meek, where he discusses the issues and the solutions.
Article is in two parts;
Part 1
http://www.modelengineeringwebsite.com/Drill_grinding_jig_1.html
Part 2
Drill grinding jig 2Last edited by MacPuddock; 3rd Feb 2018 at 12:45 PM. Reason: Correct URL
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3rd Feb 2018, 01:57 PM #7Member
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- Aug 2014
- Location
- North Queensland
- Posts
- 79
Just like to add that there were motorised drill sharpening machines available certainly in the 1960s. I started my apprenticeship as a F&T in 1960 at Evans Deakin Brisbane, Montague Road works. There was a drill sharpening machine sited just outside the tool store in the machine shop. When an apprentice had nothing useful to do the forman would send him to see the storeman to sharpen blunt drills. I can remember operating it from time to time during early years of my apprenticeship. Unfortunately I can't remember the make but I recall it could sharpen taper shank drills to a reasonable size (3"?). I don't think we changed the angle setting but the drill cutting edge had to be lined up with straight indicating plate and I think was held in a two jaw chuck or clamp. If it wasn't lined up properly the profile would look odd so start again. It had a reciprocating action while rotating and soluble oil coolant flood. I think the operator had to wind in manually to do the sharpening.
Sorry this information is vague but all I can remember. I think the reason was to have sharp drills available in the tool store to prevent the tradesmen taking time to sharpen large drills. If any one has any info on this or a similar machine I would like to know as I have often wondered about it whenever I see drill sharpening methods mentioned. I have a drill sharpener similar to a simple drill doctor but I usually just sharpen drills by hand on a 4"or 6" bench grinder which works ok for me.
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18th Dec 2020, 02:34 PM #8New Member
- Join Date
- Apr 2019
- Location
- Brisbane
- Posts
- 2
Archdale Drill Sharpener.
Hi Normanby.
Your talking about an Archdale Drill Grinder which I have in my shop in operational condition. Will do up to 3" twist drills. Amazing machine to see in operation and does a wonderfull job of sharpening drills. These pictures are of when I purchased 5 years ago and in need of some TLC which I gave to it.
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19th Dec 2020, 06:55 AM #9Member
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- Aug 2014
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- North Queensland
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- 79
Looks like what I recall
Hi Graham's Eng.
Thank you for the information and photos. That machine certainly looks similar to what I recall back then. As you are in Brisbane it is possible it could be the same machine as I think the Montague Road works and its machinery have been disposed of long ago.
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