QUORN Universal Tool and Cutter Grinder
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- Опубликовано: 18 окт 2024
- This "video" shows pictures of my "finished" QUORN universal grinder. I did not have a digital video camera when I built it so it's just a lot of annotated still pictures. If you find it interesting please let me know. If there is enough interest I'll make "videos" of machining individual parts. See this machine working here: • Home Hobby Hobber Part IV Thank you.
Thanks for the overview of your Quorn Tool & Cutter Grinder. I have a full set of half-finished castings. Getting close to resuming work on them. Like how you used this tool as a toolpost grinder, too. Creative! Also, chuckled when I saw your ball-handle adjusters. I made a set for my Universal Pillar Tool .... and they were a challenge ...at first, anyway .... :) Best/Jeff
Hi Argyll1986,
Glad you liked the QUORN overview. I'm equally glad that you plan to complete yours. IF you're a "beginner", I guarantee that you will be at least a "good machinist" by the time you finish it. If you're a "good machinist" now I guarantee that you will be at least a "very good" machinist by the time you finish it. If you're a "very good " machinist now I guarantee you will have a work of art by the time you finish it.
I made my first ball handle (not to be confused with a balanced ball handle) during the construction of my "versatile dividing head" designed by George Thomas, according to his technique. Piece of cake! I found that making all the QUORN handles was no more difficult than just making one because the set-up time is the same. After set-up it's just a "load and cut" batch job.
Cheers,
F.C.
Beautiful. Completion of a Quorn is second only to the completion of a model locomotive in my book.
Hi Dick,
Thank you for your interest and kind words. Buying a really good commercial tool and cutter grinder (Swiss, German, US, English....etc) would have made more sense but I had more time than money when I built it. The QUORN and other "Mt. Rushmore" projects like live steam model locomotives are, in my humble opinion, more about the journey than the destination or completion. The real value is in what one learns along the way.
Great job! And I haven't started mine after having for 2 years. maybe this winter. But what i did not think of is making the spindle 1st and use it as a grinder to grind the base bar after a hardening process. Also instead of 2tpi post use a rack and pinion as a travel system.
Been seriously thinking about buy a casting set & building one of these. Anything else you put up would be great.
beautiful work. huge project though. thanks for showing us. SUBSCRIBED
Hi Emmas,
Thank you for your kind words. Yes, I put a LOT of hours into making it but enjoyed every minute. It was a wonderful "learning by doing" project that resulted in a very useful tool.
Cheers,
F.C.
Woulds love to see the Quorn in action. Do you have any more photos of it being used as the toolpost grinder. This is something I have thought about as a reason to make one!
Hi Matt,
Thank you for your interest. I'll see if I can find more photos with QUORN set up as a tool post grinder but I only used it to grind the air bearing for the end mill sharpening attachment. Also, the QUORN head may be too big if your lathe is smaller than a 12" swing. A word of caution about grinding in a lathe........DON'T unless you over EVERYTHING to keep grit out and set up a vacuum to travel with the wheel. Also, one can buy a reasonably good TPG for less than it will cost you for the set of rough castings.
Please provide Quorn in-action videos PLEASE !
Thanks..
We appreciate your efforts.
Hi DK,
Will do. Thank you for your interest.
Let’s see more!
I've been experimenting with my own air bearing for my Quorn. Currently I have an air bearing that floats the spindle but will not take any load. That was to be expected on a first attempt. I am trying to determine the machining allowance to leave on the bore so that I arrive at a total clearance (bore to spindle) after lapping of 3 tenths.
I am still unsure as to air flow holes. I have a commercial Clarkson air spindle which has 4 holes at about 3/4" from each end. The holes look to be about 1/16th but I have read that the holes should be IRO 1/64th.
There is a lot of conflicting information on the internet regarding air grinding spindles.
Hi Evildrome,
I'm not sure I can help you because my air bearing suffers from the same problem you describe. While it's not a rigid as a commercial air bearing it's infinitely better than the endmill grinding spindle designed by the Quorn's designer, Prof. Chaddock. I built it to a design that appeared in Home Shop Machinist MANY years ago. It ground spindle has a clearance of 0.0030" in the lapped bore. Yes, 3 thou! I recall the air jets (there are only 2, one near each end of the housing) being 1/16" dia. Each jet aligns with half round groove so there is curtain of air around the entire spindle. Hope this helps.
F.C.
@@FCleff OK, thanks. That confirms my research which is that the smaller the air gap, the stiffer the bearing (makes sense!).
Being able to make castings and machine the working faces and component parts to make a finished part would give a great sense of achievement. Thanks for sharing. Given enough time, you could build almost anything.………Or you could spend some money and go out to a shop and buy one tomorrow. No thrill in that but gets you using whatever part it is you need. The real benefit of making your own is when the part in question simply cannot be purchased {or at a reasonable price} given time you could make it from scratch.
I am about to purchase a tool and cutter grinder which has a disc with its axis of spin in line with the length of the bed. I would like to get hold of a right angle attachment where the disc runs perpendicular to the length of the bed so that I can grind externals of cylinders / tapers etc. Maybe I will have to follow your lead and make one from scratch.
If you can, please do at least some short videos on how you go through the steps from making a mould, casting, finishing the casting, smoothing and painting a casting. Machining the internal parts is covered elsewhere but if you could do one of the interesting handles with a ball connecting two rods for example would be interesting.
Hi Peter,
Thank you for your interest. I only have still photos of this project I truly wish I had had a digital video camera when I built this machine so that I could share them here. If I do any pattern-making, casting for finishing in the future I'll be sure to document it in video. The ball handles were fun to make. Again, if I make any more of them I'll be sure to document them on video.
Cheers,
FC
Dear F. Cleff {Normally I address someone by their name but to date I can't see yours so the F will be a temporary placeholder}. I did look further and found an excellent series on making moulds and casting and machining those castings into working machine parts on a site from MyFordBoy. He has done what I asked for. Thanks and have a nice day.
Hi Peter,
Glad you were able to find everything you needed.
FC