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  1. FS - Back yard foundry chemicals. Resin systems, mould release, Duratec paint.

    I am getting rid of all my foundry stuff as I cant easily ship half used containers back home (outside US). Not sure what it would all be worth, but Id consider letting it go for a box of beer :U
    ...
  2. The chill blocks worked well. The risers worked...

    The chill blocks worked well. The risers worked well on 2 bosses but not perfectly on the bigger bosses. So I could add some chills there too.
    The slight defects are on a face with machine allowance...
  3. I think I'll try adding risers to the top thick...

    I think I'll try adding risers to the top thick areas and chill blocks to the middle.
    For the chill blocks I'll size them to be the same mass as the bigger boss. (so one will be 1:1 mass and the...
  4. Does the chill block need to be the same volume...

    Does the chill block need to be the same volume as the part that it is chilling?

    Or is the goal only to decrease the thick area temperature by X amount? So if I have a 50gram boss I may only need...
  5. Thanks for the great info and insight. ...

    Thanks for the great info and insight.





    I dont think its caused by something getting in there. It really looks like its dry and rough because of its shrinking. No thin areas have it...
  6. Here are some images. Most of the thicker...

    Here are some images. Most of the thicker sections were actually acceptable. The one that really shrunk was the area that was twice as thickas the rest. So I could possibly get away with just fixing...
  7. Adding chill blocks/heatsinks for Aluminium casting

    I have some thick sections in my casting that are shrinking a lot so I would like to add chill blocks to solidify that section quicker.


    Does anyone have any resource on best practice or could...
  8. So the answer was to mix the initial parts into...

    So the answer was to mix the initial parts into the sand and then chill it down before adding the final part. If I chill it down to 10C I can get the work time to easily 20mins.
  9. Thanks. Yeah that should be possible but I havnt...

    Thanks. Yeah that should be possible but I havnt had a lot of luck in practice. You get funny joins in the sand and if it starts to go of in the slightest the new sand doesnt really stick. I guess if...
  10. Mixer options for Hard Sand home foundry

    I am having issues with my hardsand going off too quickly. 5-10mins

    I am using the resin system Techniset 6700 with Catalyst 17-712
    This is supposed to be the longest setting option and should...
  11. Yip thats the one Ive got. I think I need to get...

    Yip thats the one Ive got. I think I need to get some simulation software.
  12. Thats actually the book I have been using. I need...

    Thats actually the book I have been using. I need to read it in a lot more depth I think.
  13. Cheers. How would you have done it in the...

    Cheers.

    How would you have done it in the 'good ol' days'?
    I dont know modern foundry practice, I dont actually know any foundry practice for that matter! Its been a combination of Google images,...
  14. Patterns-Orientation and runner system suggestions

    Im looking for some advice on part orientation when gravity filling.

    I have a sump Im casting and I am at the stage of designing the runner system.
    The ideal orientation for this part (for ease...
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