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Type: Posts; User: rotarysmp

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  1. Replies
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    A cafe racer needs Clip-on's. I talked to your...

    A cafe racer needs Clip-on's. I talked to your Chiropractor, and he agreed with me.

    Nice build
    Mark
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    1,046

    The head of pressure is the same whether the...

    The head of pressure is the same whether the liquid column is directly above or off to the side, it is soley dependant on the height of sprue.

    You have a fair bit of gas porosity there. How are...
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    16,202

    Great result. You perseverance has been well...

    Great result. You perseverance has been well rewarded.
    Mark
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    283

    Those pallets at the bottom at well placed target...

    Those pallets at the bottom at well placed target to hurt yourself on.
    Mark
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    That'll save some elbow grease. Mark

    That'll save some elbow grease.
    Mark
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    1,514

    If you think that the best green sands are not...

    If you think that the best green sands are not made (synthetic green sand), but dug out of river beds, the slurry method is what the river does. The problem with the slurry method is it gives you one...
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    Thanks guys. Edgefinder, we look forward to...

    Thanks guys.
    Edgefinder, we look forward to seeing some of your vintage motorbike parts, and your shop. I have a friend here who specializes in restoring unique histororic racing motobikes from the...
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    I did a bit of cleaning on it, and threw a clock...

    I did a bit of cleaning on it, and threw a clock on the spindle. Not bad!
    https://www.youtube.com/watch?v=8OOTBLRoC6c
    Mark
  9. If I may offer a mild criticism, some aspects of...

    If I may offer a mild criticism, some aspects of your build conform closer to the French definition of engineering ... "Why build simple if complicated also works" than Kalashnikov's axiom :)
    Mark
  10. Nice toys you have to play with. Especially that...

    Nice toys you have to play with. Especially that scanning arm look forward to the next installment.
  11. Replies
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    1,594

    Hi David and Edgefinder, Thanks for the...

    Hi David and Edgefinder,

    Thanks for the inputs. Edgefinder, I see you are new here. Where are you from and what are you casting? The Maho 700 is a pretty big solid chunk of iron. Nice. Maybe you...
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    Hi Edgefinder, Thanks for your input. That is...

    Hi Edgefinder,

    Thanks for your input. That is definately my plan. I beilive the Phillips 432 wasa pretty capable control, so I do want to try and get it running as is. At worst case, if a brain...
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    Everything about this machine is pretty massively...

    Everything about this machine is pretty massively built. The arm that the user module swings on must weigh 40kg. I figured for only a few hundred € more than an RF45, this way I get ball screws,...
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    X 400mm Y 250mm Z 350mm. Although right now...

    X 400mm
    Y 250mm
    Z 350mm.

    Although right now zero, until I can get the brain going again. Very rigid machine, it weighs 1400kg. The ball screws are about 50mm diameter
    Mark
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    Bit of a challenge getting it in there. The...

    Bit of a challenge getting it in there. The machine shop is actually the room behind the garage, but the door I only 70cm wide. I'd have to remove the huge control cabinet, the Y-axis ram and the...
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    1,594

    I picked up a MAHO 400E

    Hi guys,

    I bought a MAHO 400E with a personality problem. Picked it up on Sunday. ...
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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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    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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    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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    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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    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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    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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    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
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    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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