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Cutting glass globes

Discussion in 'Fettlers Master Class' started by phaedrus42, Mar 8, 2016.

  1. phaedrus42

    phaedrus42 South Africa Subscriber

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    I acquired another Primus 1020 and also my first Radius 119 and found myself in need of two more shortened Coleman large straight sided globes.

    This time I decided to try my hand at cutting them myself.

    I used a diamond coated titanium disk in my trusty Dremel tool. I secured the Dremel in my bench vise, clamped an old block battery to the workbench as a guide, and marked the globe in the burner cage of the lamp. Then I turned on the Dremel at fairly low speed and while turning the globe with one hand, fed a dribble of water from a squeeze bottle onto the cut with the other hand. The disc cut the glass like the proverbial hot knife through butter.

    It is a rather messy process with the water spraying everywhere and it seems that a lower speed and shallower cut would give a better result.

    1457456646-glass-cutting.jpg
     

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  2. patatwin

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    Good job !
     
  3. longilily

    longilily United Kingdom Subscriber

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    Nice Phil :thumbup: looks to be a tidy cut :clap:
     
  4. Tony Press

    Tony Press Australia Subscriber

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    Good work, Phil. :thumbup:
     
  5. David Shouksmith

    David Shouksmith United Kingdom Founder Member

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    Cracking job, that... :thumbup:
     
  6. Hanzo United States

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    McIverring at its finest.
     
  7. HighlandDweller United Kingdom

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    Great work, must remember that one.

    I wonder if it would be possible to flame polish the edge? I must try that sometime.
     
  8. kerry460

    kerry460 Australia Subscriber

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    very interesting .

    thankyou

    kerry
     
  9. Scotlamp

    Scotlamp United Kingdom Subscriber

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    Outstanding
     
  10. Digout

    Digout Australia Subscriber

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    Excellent Work, Thanks for sharing the process.
    :thumbup: :thumbup:
     
  11. ColinG

    ColinG United Kingdom Subscriber

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    So... now I know it's possible this is definitely going to happen! I've found out that 34oz/8 cup cafetière has the same diameter as Vapalux/Bialaddin globes so that will be my first attempt.
     
  12. phaedrus42

    phaedrus42 South Africa Subscriber

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    Update: I have changed my setup. Having the Dremel in a vertical position and the globe to be cut standing on end next to it seems to work much better. It prevents scoring marks from splinters scratching the sides of the globe as you rotate it. Using the laboratory glass stand to hold the dremel also makes it easier to adjust the height. Remember to wear eye protection and to continuously feed a dribble of water into the cut.

    glass-cut-dremel1.jpg deremel-glass-cut2.jpg
     
  13. WimVe

    WimVe Netherlands Subscriber

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    Good job !
    Are you left handed, btw ?
     
  14. phaedrus42

    phaedrus42 South Africa Subscriber

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    Wow, Wim, you've really got me scratching my head now, trying to figure out why I did it that way. :doh::-s No, I'm generally right handed but I can now see why you would think otherwise, looking at the photos. I gave it no thought at the time, but it seemed natural to me to rotate the glass with my left hand while feeding water with my right. Maybe I was subconsciously looking at it as if it were a metal working lathe, where one would control the left-right motion of the toolpost with the left hand and the in-out motion with the right.
     
  15. ColinG

    ColinG United Kingdom Subscriber

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    I have a Dremel copy but I don't think it'll be up to the job so now I'm looking for the real thing!
     
  16. JonD

    JonD Spain Subscriber

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    Maybe save your money.
    The slop in my Dremel bearings is quite abysmal...
    I hate to say the 4 letter word that starts with J and ends with K
     
  17. phaedrus42

    phaedrus42 South Africa Subscriber

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    I'm sure a dremel copy will work just fine as long as the cutting disc does not wobble. High speed and torque not needed; just take it slow and easy.
     
  18. ColinG

    ColinG United Kingdom Subscriber

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    I've ordered a diamond cutting disc and plan to use it in my pillar drill and off-set the base plate to one side to support the jug when I do the cutting. I think that should do the trick.
     
  19. Titoo

    Titoo France Subscriber

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    Hi Phil,

    Fantastic job :clap:
    Congratulation

    Regards,
    Titoo
     

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