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  1. Replies
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    Okay you were right. That I cool. Will you do...

    Okay you were right. That I cool. Will you do brakes?
    Mark
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    115

    First 3D printed pattern

    Since I finished my 3D printer last week, I decided to use it to make the complicated bits for a pattern I need for a Z Axis sled on my little CNC project....
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    1,374

    Aluminium is a "hot short" metal. Weak and...

    Aluminium is a "hot short" metal. Weak and crumbly at elevated temps. The ablity to collapse during the freezing of the metal is an important characteristic of casting sand (normally more a...
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    My furnace cost more than 50c.

    My furnace cost more than 50c.
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    977

    I investment cast a PLA 3d printed part over the...

    I investment cast a PLA 3d printed part over the weekend, and had differculty getting decent adhesion of the first layer of plaster/sand invesment. Thanks for this post. I will try shellac or...
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    1,374

    Interesting, and challenging casting project. ...

    Interesting, and challenging casting project.

    CrazyBillyBob suggestion of pulling a female mould off that pattern, to then duplicate it, then cutting the duplicates for the shrink allowance is...
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    3,109

    I really like the way you did the gating and...

    I really like the way you did the gating and shrinkbobs. Are the gate and runners part of the pattern, or are these loose parts you have to position each time.

    Congratulations on developing a...
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    689

    I guess you don't have to ride up hills. Adding...

    I guess you don't have to ride up hills. Adding weight to a bike is not cool :)
    Mark
  9. Replies
    65
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    2,376

    Rather doing an accelerated dryout, such as 24H...

    Rather doing an accelerated dryout, such as 24H dry out with a light bulb, I would push the finished furnace in to the corner of the shed for couple of weeks, and spend the time making lifting tongs,...
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    Nice pattern work. Look forward to seeing the...

    Nice pattern work. Look forward to seeing the finished castings.
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    585

    I only tried brass once. Bunch of old taps, so I...

    I only tried brass once. Bunch of old taps, so I guess yellow brass. The cloud of zinc smoke coming out of the furnace makes this a no-go for my suburban foundry. Can you prevent this smoke? Does...
  12. You are making more dross (Aluminium oxide) than...

    You are making more dross (Aluminium oxide) than liquid aluminium. This is due to:
    1/ wrong choice of scrap. Wrought alloy (the sign) and expecially the cans, are neither good casting alloys, nor...
  13. Root cause of your motor problem is that you over...

    Root cause of your motor problem is that you over simplified and underengineered your space shuttle erector ��. If you put a servomotor and glass scale feedback on it, you could control the lid with...
  14. Using 3d scanning, CAD, CAM, 3d printing and...

    Using 3d scanning, CAD, CAM, 3d printing and rapid prototyping technologies like printed cores, he has 1000h invested in the engine already. How many hours were originally invested in the Bugatti...
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    2,376

    I took a look at your boat thread. Nice...

    I took a look at your boat thread. Nice workmanship. Are lights under water to attract squid?

    Very PC forum that boat one. Censored glass and seagrass, so we wouldn't make an ass of ourselves...
  16. Link to a guy in NZ doing an amazing Bugatti replica - engine casting

    http://oldschool.co.nz/index.php?/topic/53938-bugatti-t5759-engine-project/&

    Wow!
    Mark
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    196
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    9,731

    You have your equipment and techniques nicely...

    You have your equipment and techniques nicely dialled. I haven't got there yet. Thanks for posting you methods.
    Maek
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    9,731

    How do you degas? I tend to overheat aluminum,...

    How do you degas? I tend to overheat aluminum, and got a lot of gas porosity till I started argon purging it.
    Mark
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    9,731

    Great looking parts. Looking at your video, are...

    Great looking parts. Looking at your video, are you sure about your temperature calibration? 1440F would be well into bright cherry red, but your crucible isnt radiating at all....
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    Sticky: On Thursday I did a casting session with friends....

    On Thursday I did a casting session with friends. We did lost foam, green sand and PLA investment.
    http://www.deadlock.dhs.org/jin/hammerheads
    The PLA invested in blocks of plaster of Paris without...
  21. Thread: New Lathe

    by rotarysmp
    Replies
    11
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    343

    Nice restore. Who did the bed grinding for you?...

    Nice restore. Who did the bed grinding for you? Expensive? Looks like it was in pretty good condition before the restoration. I see only minor chuck scars ont he cross slide.

    Did you have to drop...
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    3,551

    Those are really nice patterns you have made....

    Those are really nice patterns you have made. Look forward to seeing the resulting castings. How many lb/kg will the largest casting be?
    Mark
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    "Drastically reduce manufacturing" yes but this...

    "Drastically reduce manufacturing" yes but this is reletive. GE have a additive manufactured fuel nozzle for the LEAP engine. When you consider that aircraft engine fuel nozzles have been furnaced...
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    If you look in YouTube under Deckel Mori...

    If you look in YouTube under Deckel Mori Lasertec, or laser disposition welding, you'll find a number of very impressive product videos. The technology has been around for at least a decade.
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    Lava is very general term. Different rocks have...

    Lava is very general term. Different rocks have vastly different melting points. If you want a runny lava read up on the chemistry of rocks and find something with a low melting point.
    Mark
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