Epoxy-Granite machine bases (was Polymer concrete frame?) - Page 3


Page 3 of 412 FirstFirst 1234561353103 ... LastLast
Results 25 to 36 of 4934

Thread: Epoxy-Granite machine bases (was Polymer concrete frame?)

  1. #25
    Member
    Join Date
    Jul 2005
    Location
    Canada
    Posts
    12177
    Downloads
    0
    Uploads
    0

    Default

    I found this page which gives a lot of answers that lead me to conclude this is not a technique that can be readily adapted to DIY; considering you first need to make a very precise steel mold and the material cannot be worked after casting.

    http://www.itwpolymercastings.com/faqzanite.html


    But the materials are not difficult to find:

    "Zanite® polymer composite is a blend of pure silicon dioxide ceramic (99.8%) quartz aggregate, specially formulated high strength epoxy resin and selected additives. The natural elliptical shape of quartz is ideal for casting intricate structures."

    In fewer words; sand and epoxy.



  2. #26
    Registered lgalla's Avatar
    Join Date
    Jul 2006
    Location
    canada
    Posts
    1256
    Downloads
    0
    Uploads
    0

    Default

    Mcgyver and Geof
    I have to agree, I cant see a hobyist building an entire machine ofE/G.For us hobbists we can use it for table tops,machine bases and weldment filling.Yes there are commercial machines totally composites, made in molds.
    I would hate to think what would happen if a forklift bumped into a 100% polymer machine
    Larry



  3. #27
    Member
    Join Date
    Jul 2005
    Location
    Canada
    Posts
    12177
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by lgalla View Post
    ...I would hate to think what would happen if a forklift bumped into a 100% polymer machine Larry
    I would hate to think what would happen if a forklift bumped into any machine!!

    But I do have a question: You say; "there are commercial machines totally composites", are there really? All I have read refers to machine bases not the full machine.



  4. #28
    Registered walter's Avatar
    Join Date
    May 2003
    Location
    USA
    Posts
    792
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by Mcgyver View Post
    I had never thought of an epoxy granite structure as replacing a steel fabrication, its not strong enough imo, the yield stress is much lower than steel or cast iron irrc and the modulus of elasticity is about 1/6....
    Good point.

    Then again, folks here don't build metal working CNCs. 90% of these machines are destined for wood, mdf, foam, plastics, aluminium.

    I'm into wood machining, and really dislike the idea of steel tubing, welds, drilling. Fastening together 800 lbs of tubing would take months! I even hate the smell of it

    I just need the basic rigidity and level- I'll go with (reinforced) concrete type of material.

    Thanks for all the replys- you guys are the best!



  5. #29
    Registered greybeard's Avatar
    Join Date
    Jun 2005
    Location
    UK
    Posts
    1414
    Downloads
    0
    Uploads
    0

    Default

    Mike - could you revise the link to that story in #23 as your link is only to the picture.Thanks
    John

    It's like doing jigsaw puzzles in the dark.
    Enjoy today's problems, for tomorrow's may be worse.


  6. #30
    Registered
    Join Date
    Jan 2007
    Location
    usa
    Posts
    10
    Downloads
    0
    Uploads
    0

    Default Found more Polymer Concrete

    http://5128.rapidforum.com/topic=110...6&search=beton

    try this link. German cnc site. Just look at those pic's. Looks Good

    Attached Thumbnails Attached Thumbnails Epoxy-Granite machine bases (was Polymer concrete frame?)-t6765_110773689090_portal7-jpg   Epoxy-Granite machine bases (was Polymer concrete frame?)-t6765_110773689090_portal6-jpg   Epoxy-Granite machine bases (was Polymer concrete frame?)-6765_110773689090_form4-jpg   Epoxy-Granite machine bases (was Polymer concrete frame?)-t6765_110773689090_porta2-jpg  



  7. #31
    Registered greybeard's Avatar
    Join Date
    Jun 2005
    Location
    UK
    Posts
    1414
    Downloads
    0
    Uploads
    0

    Default

    schrupphobel72 - Your last three images are corelpaint (?) could you make them jpegs so we can enlarge them.
    Not sure about the link as I don't read German -it's a forum, I think ?
    John

    It's like doing jigsaw puzzles in the dark.
    Enjoy today's problems, for tomorrow's may be worse.


  8. #32
    Registered lgalla's Avatar
    Join Date
    Jul 2006
    Location
    canada
    Posts
    1256
    Downloads
    0
    Uploads
    0

    Default Bad News

    And now for the bad news, cost.
    Lets assume$50/gal for epoxy,10 cents a pound for sand.I will round off to the nearist numbers.
    To simplify things we will try 33 1/3 % epoxy/sand.
    1cu/ft epoxy=7gallons =70lbs=$350
    1cu/ft sand=166lbs=$16.60X2=$33.20
    Now we take 1 cuft epoxy and 2cuft sand and have our33%to66% ratio
    So the cost for 3cuft=$350.00+33.20=$383.20
    Cost per cuft.=$120.00
    Weight of 3cuft 402lbs
    Cost/sqft=$10.00
    Our 3cuft at $383.20 gives us 32sqft one inch thick.
    Looking back to post #10 from Episs we are close to the same price and weight
    More calculations for my 6'X12'X4" router table.Lets see 72sqft4"thick=280sq ft X$10=$2800.00 Total weight 3080lbs
    Larry



  9. #33
    Registered greybeard's Avatar
    Join Date
    Jun 2005
    Location
    UK
    Posts
    1414
    Downloads
    0
    Uploads
    0

    Default

    Larry - Why not use a layer of patio paving slabs as the top, epoxied together, then coat that with 1/4"skin(or even less?)
    John

    It's like doing jigsaw puzzles in the dark.
    Enjoy today's problems, for tomorrow's may be worse.


  10. #34
    Registered greybeard's Avatar
    Join Date
    Jun 2005
    Location
    UK
    Posts
    1414
    Downloads
    0
    Uploads
    0

    Default

    Build a torsion box out of paving slabs ?
    John

    It's like doing jigsaw puzzles in the dark.
    Enjoy today's problems, for tomorrow's may be worse.


  11. #35
    Registered
    Join Date
    Jan 2007
    Location
    usa
    Posts
    10
    Downloads
    0
    Uploads
    0

    Default

    attached the pic's from the german site again

    Epoxy-Granite machine bases (was Polymer concrete frame?)-6765_110773689090_form11-jpg


    Epoxy-Granite machine bases (was Polymer concrete frame?)-6765_110773689090_form12-jpg

    Epoxy-Granite machine bases (was Polymer concrete frame?)-6765_110773689090_portal7-jpg

    Epoxy-Granite machine bases (was Polymer concrete frame?)-6765_110773689090_form8-jpg

    Epoxy-Granite machine bases (was Polymer concrete frame?)-6765_110773689090_portal6-jpg



  12. #36
    Registered
    Join Date
    Mar 2005
    Location
    Toronto, Canada
    Posts
    1136
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by walter View Post
    Good point.

    Then again, folks here don't build metal working CNCs. 90% of these machines are destined for wood, mdf, foam, plastics, aluminium.

    thats part of it - different paradigm - no doubt we're visualizing two very different machines! its building metal working cnc's that interest me, I have little interest in wood machines for now. my thoughts were that a heavy weldment, using structural shapes could be filled with E/G and you'd have a chance at a metal working machine, small work envelope but very heavy and rigid. still, from I've been able to learn, its advantage over steel/CI is in vibration dampening, not strength or rigidity.



Page 3 of 412 FirstFirst 1234561353103 ... LastLast

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Epoxy-Granite machine bases (was Polymer concrete frame?)

Epoxy-Granite machine bases (was Polymer concrete frame?)

Epoxy-Granite machine bases (was Polymer concrete frame?)