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  #1  
Old 05-06-2022, 06:22 PM
jcarpenter jcarpenter is offline
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Default Curved tapered tubes (tentacles)

Thinking about trying to fab an octopus out of 22 gauge CRS. The tentacles look like the hardest thing. Made a straight taper tube, a slightly curved tapered tube, and a fairly curvy tapered tube. If I can halve the curve radius I will be about where needed. These were all sunk on a stump.


Steel Spiculums2.jpg
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Old 05-06-2022, 07:51 PM
BTromblay BTromblay is offline
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Hi,

Neat project. I had made some similar tubes out of 3003-H14 x .040" aluminium a month ago. The process was all done with a bench stake, cross peen hammer and patience. By varying the width of the strip of material, it adds more character to the part.

Let us know how it turns out.

B
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Old 05-07-2022, 10:31 AM
cliffrod cliffrod is offline
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Very cool.



I've specifically had octopus projects on my mind, using aluminum welded with oxy/hyd rig so could limit flux use & required cleaning afterwards. So far I'm still practicing the welding part..


Like Bill said, please keep us posted with progress.
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  #4  
Old 05-11-2022, 11:34 AM
jcarpenter jcarpenter is offline
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Default Octopus arms

Hmmmm, seems octopi have arms not tentacles. So this is my progress on making octopus arms. Got the arm radius to 3 inches but think I really need 2 inch radius. Next step to to tighten up the stump cavities used. 22 gauge CRS strip was 2.5 inch on one end, .75 inch on the other and 12 inches long.


IMG_4446.jpg
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Old 05-12-2022, 12:10 PM
fciron fciron is offline
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You might try bending over a stake rather than into a stump. Look up sinusoidal stake and anticlastic raising s used in jewelry and silver smithing. The techniques scale up.
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  #6  
Old 05-12-2022, 01:32 PM
jcarpenter jcarpenter is offline
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Default Transistion Octopus arm

Lewis,


Yes, I have been playing with jewelry techniques. Creative Metal Forming by Longhi and Eid has been a great resource. Modified the approaches for steel a little bit. Used a giant oak one pocket stake and a steel horseshoe stake to crush the reverse into the stake pocket for my curved 2 sided fish. The sides of the horseshoe stake constrain the sides of the reverse so the shape can't escape.


IMG_4208.jpg


Now trying to downsize that tooling for octopus arms. Still experimenting.


IMG_4452.jpg


IMG_4455.jpg
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Old 05-12-2022, 08:12 PM
BTromblay BTromblay is offline
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Hi,

I made a anti clastic stake like in the creative metal forming book by Longhi and Eid and have used it with great success in aluminum. A lot of great information in the book, including shrinking in a reverse which has been beneficial to metal shaping.

Good stuff,

B
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Old 05-12-2022, 10:19 PM
DarkLightning DarkLightning is offline
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Nice work so far, it's coming right along! I'm also enjoying looking at that curly maple table top!
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Old 05-13-2022, 11:59 AM
fciron fciron is offline
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Those tools look good. I learned from Heikki Seppa’s Form Emphasis For Metalsmiths. I’ll look for the newer book.

I made an enormous sinusoidal stake four a project. In retrospect, a series of individual stakes would have been easier to make and more useful. But dang that thing looks cool.

Remember that you can continue to shape your tubes after the seams have been welded too.


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Last edited by fciron; 05-13-2022 at 12:03 PM.
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  #10  
Old 05-15-2022, 08:47 AM
mark g mark g is offline
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https://allmetalshaping.com/showthre...9273#post29273

I wonder if this thread would be helpful.
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