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Quorn Mk3 - Universal Tool & Cutter Grinder

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  • Bruno Mueller
    replied
    Originally posted by Paul Alciatore View Post
    Bruno,

    That looks fantastic. And it only took a half year to make the parts. I am retired and I think it would take me at least two years or longer.

    Great job! Next time I am in Deutchland I will drop by with a bucket full of dull milling cutters.


    Yes, the production of most parts was done in half a year.
    I had started in June/July 2007 and was finished with parts just before Christmas, so I was ready for grinding.

    I built the project parallel to my professional work.
    But every free minute I had was in my workshop and on weekends I spent 6 to 8 hours a day. My family didn't see much of me during this time.

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  • Paul Alciatore
    replied
    Bruno,

    That looks fantastic. And it only took a half year to make the parts. I am retired and I think it would take me at least two years or longer.

    Great job! Next time I am in Deutchland I will drop by with a bucket full of dull milling cutters.

    Leave a comment:


  • Paul Alciatore
    replied
    How did that come about? I don't know with complete certainty, but the prefix "milli" simply means one thousandth (1/1000). It is a universal prefix and can be applied to any unit of measure. So a milli meter is one thousandth of a meter. A milli liter is one thousandth of a liter. A milli gram is one thousandth of a gram. And it can also be applied to English units. A milli inch would be one thousandth of an inch or 0.001 inches.

    It is not very far from milli inch to an abbreviation of that or mil.

    Of course it is equally reasonable to think that a person in a time and country that used metric units to think of a mil as a milli meter.



    Originally posted by JRouche View Post

    I agree. It seems I have heard the term a "couple of Mils" also when they were thinking .001" How did that come about in the machinist world? And this was years ago. JR

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  • JRouche
    replied
    Originally posted by Bruno Mueller View Post
    I built the Quorn clone "Bonelle" a few years ago.
    Thank you Bruno for the photos and talk. Love it.... JR

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  • Mcgyver
    replied
    Indeed....looks good!

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  • thaiguzzi
    replied
    Super work Bruno, well done!
    Love the m/c type gaitors for dust/grit exclusion.

    Leave a comment:


  • Bruno Mueller
    replied
    I built the Quorn clone "Bonelle" a few years ago. I found the drawings for it in the internet. Since I'm from Germany and I'm not very comfortable with the inch measurements, the measurements were all converted to the metric system.
    I made sure that I didn't get any inconsiderate measurements. Therefore the measurements were rounded up or down to 0.5mm. Today I would also lengthen the bed. Sometimes it restricts something.
    I had Hemingway send me the drawings of the Quorn MK3 some time ago.
    Inspired by them I adapted the spiral support finger to my system.
    I made some spindles for the tool holder.
    Collet holder for ER25, collet holder for W15 collets. Morse taper mount for MK2.
    It took me about half a year to make the parts, after that the grinding machine was ready for use, but not yet complete.
    Some accessories I have made over the years.
    Some pictures I show you now.
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    Bonelle still without color
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    Click image for larger version

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    Support fingers, inspired by Quorn MK3

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  • burdickjp
    replied
    This weekend I worked on a fixture for making split cotters. I hope to have a write up together soon!

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  • burdickjp
    replied
    Here's the next step in my progress:
    https://burdickjp.gitlab.io/2019/11/03/round.html

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  • burdickjp
    replied
    I started into it recently:
    https://burdickjp.gitlab.io/2019/11/02/quorn02.html

    Leave a comment:


  • J Tiers
    replied
    Originally posted by Mcgyver View Post
    ..... - you want to sharpen the periphery of an endmill, not the bottom.

    ......
    I suppose that if you want to do pockets for screwheads or other such things in places that need a straight endwise plunge cut and are not suited to using a counterbore, the end of an end mill might become more important to sharpen. Places where the surface is sloped, etc and neither drills nor counterbores will work well..

    I doubt it would ever be a real issue.

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  • Felsted_Skiver
    replied
    Originally posted by burdickjp View Post
    My kit arrived!
    The construction notes are short, but informative for their length. The user notes is even shorter, but denser. The drawings are A3 sized and are entirely digitally authored.
    Here are the included castings. At first glance, I don't think any are specific to the Mk3:


    For those who are curious, it seems the idea for the use of ER chucks on lathe tooling is to hold a square tool blank in a round collet.
    Hemingway Kits have a good reputation - I’ve made several and they are still going strong years later. I’ve also made a Mk2 Quorn for use rather than for show. There were some improvements I included before building and others I retro fitted. The Yahoo Quorn_owners group is a fantastic resource for potential builders - I recommend you join and read about the many mods that improve the original design. It sounds from their website that they have incorporated some of these but maybe not all. For example the Hemingway drawing appears to show a standard length bed whereas a longer bed is a huge improvement.

    Anyway, good luck with your build and please keep us and/or the Quorn_owners group posted!

    Leave a comment:


  • Mcgyver
    replied
    Originally posted by Sparky_NY View Post
    Don't think there is a single accessory, you would need a few. The fixture to sharpen the ends of endmills as shown in another thread, maybe a air spindle to sharpen endmill flutes, a harrig fixture(s) and maybe a few more. You could copy a T&G cutter design and just use your spindle I suppose, that wouldn't be a bad approach, maybe similar to the quorn. Asking for the same exact capabilites is where is gets very tricky!

    I bought a seneca falls T&G grinder at a local auction earlier in the year for $50, it had a the air spindle and full set of collets for that spindle which is what caught my eye. Unfortunately that is the only fixturing that was with it. .
    for endmills, all you need is the air bearing. I've one of the tilting things shown in the other thread for use with the SG, never use it - you want to sharpen the periphery of an endmill, not the bottom.

    Of course the Quorn or any T&CG can to tons more....but for most of us, if you can do the periphery on an end mill with an air bearing, you've got 95% of it covered
    Last edited by Mcgyver; 09-14-2019, 12:54 PM.

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  • Sparky_NY
    replied
    Originally posted by RB211 View Post
    Well, I have a surface grinder. Is there an accessory I can buy that mounts to the magnetic chuck that offers the same exact capabilities?
    Don't think there is a single accessory, you would need a few. The fixture to sharpen the ends of endmills as shown in another thread, maybe a air spindle to sharpen endmill flutes, a harrig fixture(s) and maybe a few more. You could copy a T&G cutter design and just use your spindle I suppose, that wouldn't be a bad approach, maybe similar to the quorn. Asking for the same exact capabilites is where is gets very tricky!

    I bought a seneca falls T&G grinder at a local auction earlier in the year for $50, it had a the air spindle and full set of collets for that spindle which is what caught my eye. Unfortunately that is the only fixturing that was with it. I have given thought to making some fixturing for it so it could be used for more. I also have a surface grinder which mostly collects dust, rarely used but sure is nice when you need it.

    Leave a comment:


  • RB211
    replied
    Well, I have a surface grinder. Is there an accessory I can buy that mounts to the magnetic chuck that offers the same exact capabilities?

    Leave a comment:

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