Al2O3's Recent Activity

  1. Al2O3 replied to the thread Intake manifold for a Mercedes OM603.

    Yes, here in the US is the similar. In fact, the first coat is usually used with a fiber/paper tape and is "setting" type compound,...

    Feb 25, 2024 at 8:20 AM
  2. Al2O3 replied to the thread Reuasbale Offset Pouring Basin.

    I took a spin back through this thread from the beginning. It's worth doing for anyone that is a serious lost foam caster and...

    Feb 25, 2024 at 7:27 AM
  3. Al2O3 replied to the thread Reuasbale Offset Pouring Basin.

    It can/will depend on the grade of SS and mesh size of your sand, but the criticality of this is to achieve core strength that is strong...

    Feb 24, 2024 at 7:40 PM
  4. Al2O3 replied to the thread V4 350cc 2 Stroke.

    It's probably a statement of the obvious, but don't plan on multiple pours using the same molding sand without allowing it thouroughly...

    Feb 24, 2024 at 7:32 PM
  5. Al2O3 replied to the thread Reuasbale Offset Pouring Basin.

    Not familiar with it. What is the density? If you have sodium silicate (water glass), you can use that as a binder for plain sand and...

    Feb 24, 2024 at 6:07 PM
  6. Al2O3 replied to the thread V4 350cc 2 Stroke.

    Practice can only help. The more massive and conductive the cup material, the more heat it will steal from the melt.....especially the...

    Feb 24, 2024 at 5:58 PM
  7. Al2O3 replied to the thread Intake manifold for a Mercedes OM603.

    Not sure what that means but your coated pattern looks very good. Yes, in most cases the sand will become hot enough to melt the...

    Feb 24, 2024 at 7:33 AM
  8. Al2O3 replied to the thread V4 350cc 2 Stroke.

    Close enough.....just go with it. You may already intend to do so, but I would extend the runner to and slightly past bottom of th...

    Feb 24, 2024 at 7:06 AM
  9. Al2O3 replied to the thread Reinforcing ceramic shell.

    It's a similar issue I encounter in lost foam casting and preferential positioning in the mold to avoid this is always part of my gating...

    Feb 20, 2024 at 6:51 AM
  10. Al2O3 replied to the thread Drag Knife.

    Price disparity seems similar in all commercial production versus hobby duty tooling. Most of the time you get what you pay for. I saw...

    Feb 19, 2024 at 8:25 PM
  11. Al2O3 attached a file to the thread Drag Knife.

    I did a quick and dirty test with and exacto blade but in gasket stock, they were so fragile the point on the tip breaks almost...

    IMG_2135.jpg Feb 19, 2024 at 5:08 PM
  12. Al2O3 replied to the thread Cutting up scrap (in this case a pressure cooker).

    Thanks Brett, Lot's of good info in that response. Your prior comment about always charging the crucible hot is what piqued my...

    Feb 19, 2024 at 2:15 PM
  13. Al2O3 replied to the thread Drag Knife.

    I looked at a laser which is how my higher use/volume gaskets are made (not by me). I'm pretty much limited to thin mineral paper...

    Feb 19, 2024 at 8:44 AM
  14. Al2O3 attached a file to the thread Drag Knife.

    As usual, there's more to the story, and there are a lot of nuansce things I'm learning along the way. The first was, there's a lower...

    Small Knife and Holder in Extension Collet.JPG the one I bought to suit Roland plotters.PNG Feb 19, 2024 at 8:38 AM
  15. Al2O3 replied to the thread Cutting up scrap (in this case a pressure cooker).

    I deviate from this practice. I'd be interested to hear your take on this Brett. Sorry for the long winded explanation while I drink my...

    Feb 19, 2024 at 7:39 AM