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  #11  
Old 05-18-2022, 11:27 AM
jcarpenter jcarpenter is offline
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Default Thread on reverses

Mark, Thanks for the link. Especially interested in your pictures of plastic dies for the TM air powered hammer. Got one of those and starting to play with making a hotdog die. Hasn't worked out well yet but my lower die had no shape.

IMG_4478.jpg


Doing reverses on anticlastic pockets by hand seems to work better for me at least for now. Your art is an inspiration to me when things are being difficult.


Thanks,
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  #12  
Old 05-18-2022, 09:26 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by jcarpenter View Post
Mark, Thanks for the link. Especially interested in your pictures of plastic dies for the TM air powered hammer. Got one of those and starting to play with making a hotdog die. Hasn't worked out well yet but my lower die had no shape.

Attachment 63519


Doing reverses on anticlastic pockets by hand seems to work better for me at least for now. Your art is an inspiration to me when things are being difficult.


Thanks,
Hi John,
About your image of the curved hotdog, a hint to drill down into the 'dog w/dia. and blind depth enough to press in your hammer die "stump" - then weld - if not already done.
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"All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919.
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  #13  
Old 05-19-2022, 07:25 AM
mark g mark g is offline
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Hose clamps are handy for pulling edges of the form closed.
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  #14  
Old 05-20-2022, 07:39 PM
jcarpenter jcarpenter is offline
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I don't actually use a stump. I use an arbor press and Baltic birch with a spherical cavity carved into it. On of my problems has been the 1.5 inch square arbor shaft that gets in the way when I try to do a long shape that turns into a spiral. So new tooling for the press. A tooling hole was drilled into the end of the arbor shaft and a grub screw added. The tooling is a 3/4 inch ball bearing welded to a 9 inch long 1/2 inch diameter shaft.


New Arbor Press Tooling.jpg


Used the press to stretch the bottom of the metal into the cavity and crush the tucks that formed along the edges. Ended up with a nice long bowl wrapped into a spiral. When the edges are folded over it will become the tubular octopus arms. The long narrow tooling works much better than the old shaft.


Octpus arm coil.jpg
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  #15  
Old 05-21-2022, 11:20 AM
cylinder9 cylinder9 is offline
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Very cool project.
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  #16  
Old 05-26-2022, 01:00 PM
jcarpenter jcarpenter is offline
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Default Maybe I need a different appraoch.

Got the spiral shrunk about where I wanted it. And it was getting harder to shrink all the time.



IMG_4500.jpg


Then proceeded to close the edges onto themselves to form the tube. Join of the edges is not welded yet. I liked the result. Quality not there but the shape is what I want. However.....



Closed Arm 1.jpg




Too much physical effort went into this arm. The multi-turn coil is too clumsy to work with and any change along the coil effects other parts of the coil in ways I can't yet predict. I think I will try a one turn only coil and when I need more I will just weld additional tubing on.
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  #17  
Old 05-26-2022, 02:09 PM
fciron fciron is offline
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Those are looking great. That is a very lively looking tentacle.

Remember, actual octopus tentacles aren’t round, they’re more semi-cylindrical, with stickers on the bottom. That might make things easier to manipulate.
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