512,384 active members
3,498 visitors online
Register for free
Login
IndustryArena Forum > Mechanical Engineering > Epoxy Granite > Epoxy-Granite machine bases (was Polymer concrete frame?)
Page 415 of 415 315365405413414415
Results 4,969 to 4,975 of 4975
  1. #4969
    Member
    Join Date
    Jul 2018
    Posts
    1023

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

    Hi All - I'm sending some Tetrium to a friend for making into motor mounts. I was going to wait until I had access to a power saw but decided to hacksaw it so I could get it away today. Cuts well. The cross section has been dressed with 80 grit. Now to make a big table so I can make slabs. Peter

  2. #4970
    Registered
    Join Date
    Mar 2008
    Posts
    256

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

    But has anybody tried sawdust? Aside from these guys, I mean: https://iopscience.iop.org/article/1...53-1591/ab279e

  3. #4971
    Member
    Join Date
    Jul 2018
    Posts
    1023

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

    Hi Flick - i think everything has been tried. But sawdust is not very stiff so is just a filler does not make it any stiffer. Peter

  4. #4972
    Registered
    Join Date
    Dec 2016
    Posts
    51
    Very informative thread. Tons of info here and impossible to remember it all

    I have attached a datasheet for a resin/hardener combination.

    What do you think about this one for an EG cast?

    400mpas viscosity - good.
    Potlife 30min - on the shorter end of the scale, but manageable for smaller batches?
    Anything else?

  5. #4973
    Member
    Join Date
    Jul 2018
    Posts
    1023

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

    Hi Buoyen - 400 is a bit thicker than many out there. But it will work. Look up Biresin CR83 via SIKA. 155 mpas and longer gel time. The longer gel time allows the resin to wick into corners and filler better. Peter

  6. #4974
    Registered
    Join Date
    Dec 2016
    Posts
    51

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

    Okey, great, thank you!

    I'll have a look for CR83. But I can get the BC309 local so that is easy!

  7. #4975
    Member
    Join Date
    Jul 2018
    Posts
    1023

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

    Hi Buoyen & welcome to 2020!! - I've just read the TDS and I think you need to send a note to the supplier asking what is the maximum thickness this can be cast in. Its application is for relatively thin floor coatings and 30mins gel is quite active. So if you cast this at say 25mm thick I expect it will exotherm considerably and may burn. By burn I mean it could get hot enough to destroy itself, it turns a very ugly brown and cracks and smells and its structurally destroyed. Thick casts of the wrong resin can ignite in the right conditions as well (or wrong depending on what side of the event you are on). Epoxies are formulate for thin film curing or thick film. I think this is a thin film. Thin film assumes the substrate will absorb the exotherm and being thin film it needs lots of energy to cure (as it sheds heat to atmosphere very easily as its thin) hence the fast gel time, plus thye fabricators don;t want to hang around for hours for this to cure. The filler will absorb heat that's good. Perhaps do a trial cast at your expected thickness and mix but do it outdoors, away from any flammable stuff!! Not on the kitchen table... Peter

Page 415 of 415 315365405413414415

Similar Threads

  1. Replies: 70
    Last Post: 09-30-2019, 03:01 AM
  2. Replies: 14
    Last Post: 11-20-2017, 07:57 PM
  3. Replies: 9
    Last Post: 01-15-2014, 11:39 AM
  4. Index to "Epoxy-Granite machine bases" thread
    By walter in forum Epoxy Granite
    Replies: 13
    Last Post: 12-02-2011, 05:45 AM
  5. Epoxy-Rice Machine Bases (was Polymer rice frame?)
    By mdierolf in forum Mechanical Calculations/Engineering Design
    Replies: 18
    Last Post: 11-02-2008, 04:16 AM

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
  •