Cutting Pyrex

Discussion in 'General Engine Discussion' started by Brass_Machine, Mar 5, 2008.

Help Support HMEM by donating:

  1. Mar 5, 2008 #1

    Brass_Machine

    Brass_Machine

    Brass_Machine

    Well-Known Member

    Joined:
    Aug 29, 2007
    Messages:
    1,314
    Likes Received:
    7
    What is the best way to cut down a pyrex test tube? I have never done this before...

    Eric
     
  2. Mar 5, 2008 #2

    rake60

    rake60

    rake60

    Well-Known Member

    Joined:
    Jul 8, 2007
    Messages:
    4,766
    Likes Received:
    113
    Well Eric I can tell you how I did it when I attempted a lamina engine.
    Hopefully some that knows the proper way will step in to correct me.

    I chucked the test tube up in the 3 jaw of my lathe padded with thin strips
    of rubber. Then I mounted a cheap hand glass cutter in the tool post and slowly
    advanced it until there was a good even scribe line cut into the glass.
    A few very patient light taps around that line with a piece of 1/4" brass stock
    broke it through. It wasn't as clean of a break as I had hoped for but a little
    working over some 220 grit emery cloth taped to the work table and nobody would
    ever know. ;)

    Rick
     
  3. Mar 5, 2008 #3

    Cedge

    Cedge

    Cedge

    Well-Known Member

    Joined:
    Jul 12, 2007
    Messages:
    1,730
    Likes Received:
    23
    Brass
    I just saw this on Ebay. I can remember back in the 1980's when Ronco, Ginsu or one of those exuberant TV sales mavens once offered a bottle cutting kit for making artsy crafty creations. It wouldn't very be hard to make one of these for cutting a test tube, or even the main cylinder for a stirling.

    Steve

     
  4. Mar 5, 2008 #4

    Powder keg

    Powder keg

    Powder keg

    Well-Known Member

    Joined:
    Oct 11, 2007
    Messages:
    1,091
    Likes Received:
    2
    What you building?:eek:)

    Wes
     
  5. Mar 5, 2008 #5

    raym 11

    raym 11

    raym 11

    Well-Known Member

    Joined:
    Jul 21, 2007
    Messages:
    147
    Likes Received:
    0
    I need to cut 1/16 or 1/8 thick glass into aprox. 2" circle for Ridders 'foam carb'
    Any ideas?

    Ray M
     
  6. Mar 5, 2008 #6

    gilessim

    gilessim

    gilessim

    Well-Known Member

    Joined:
    Aug 2, 2007
    Messages:
    340
    Likes Received:
    2
    I found these cheap chinese diamond discs on a market stall for about $15 for 8 ,they are 50mm dia., they also had 75mm ones, I have a little Proxxon table saw so I re-drilled one to fit ,they are the bees-knees for cutting test tubes and the sides work a treat for the edges of glass plate, for cutting a circle you could roughly cut with a normal glass cutter first and make a little jig with a pin somehow superglued to the centre of the disc to turn it against the diamond wheel to clean up the rough edge, you could even mount it in a Dremel. I'm sure they can be found on ebay or somwhere.
    [​IMG]

    Giles
     
  7. Mar 5, 2008 #7

    Brass_Machine

    Brass_Machine

    Brass_Machine

    Well-Known Member

    Joined:
    Aug 29, 2007
    Messages:
    1,314
    Likes Received:
    7
    I may order This and see if it works.

    Eric
     
  8. Mar 5, 2008 #8

    Brass_Machine

    Brass_Machine

    Brass_Machine

    Well-Known Member

    Joined:
    Aug 29, 2007
    Messages:
    1,314
    Likes Received:
    7
    Lamina engine. :)

    Eric
     
  9. Mar 5, 2008 #9

    BobWarfield

    BobWarfield

    BobWarfield

    Well-Known Member

    Joined:
    Dec 27, 2007
    Messages:
    1,151
    Likes Received:
    1

Draft saved Draft deleted

Share This Page

Group Builder