A
few things became apparent after the test bend.
Firstly that bending around the frame one curve at a time limits the amount of material flow. Next time I need to try bending from the top of the frame down, this will probably require more assistance but should get a better result.
Secondly at only 180 degrees the plastic is still slightly inflexible and it became quite a chore to for the pipe around the frame, using a higher heat should make the plastic more malleable.
Thirdly we allowed for overlap in the material by adding roughly an additional 20mm of pipe to our estimation; this was in fact almost all used up in the material flow at the bends.
The end result had a few minor creases in the plastic at the fold lines, but I think the changes I’m planning to make should remove them in the next attempt.
These factors were all taken on board when during the next two bends that became my chair legs.
I heated the sand up two 230 degrees this time (our ovens max setting) this meant that the pipe was much more malleable, and could be manipulated around the frame with greater ease, and the was less bunching up of the material at the corners which is what caused the creases in the previous test. Bending the second frame required unscrewing the support braces and curves I had made and moving them out two the second set of dimensions id marked up, but other than that the process was exactly the same.
As a final touch two this process the cess material was cut away and I was left with two useable chair leg frames.
Firstly that bending around the frame one curve at a time limits the amount of material flow. Next time I need to try bending from the top of the frame down, this will probably require more assistance but should get a better result.
Secondly at only 180 degrees the plastic is still slightly inflexible and it became quite a chore to for the pipe around the frame, using a higher heat should make the plastic more malleable.
Thirdly we allowed for overlap in the material by adding roughly an additional 20mm of pipe to our estimation; this was in fact almost all used up in the material flow at the bends.
The end result had a few minor creases in the plastic at the fold lines, but I think the changes I’m planning to make should remove them in the next attempt.
These factors were all taken on board when during the next two bends that became my chair legs.
I heated the sand up two 230 degrees this time (our ovens max setting) this meant that the pipe was much more malleable, and could be manipulated around the frame with greater ease, and the was less bunching up of the material at the corners which is what caused the creases in the previous test. Bending the second frame required unscrewing the support braces and curves I had made and moving them out two the second set of dimensions id marked up, but other than that the process was exactly the same.
As a final touch two this process the cess material was cut away and I was left with two useable chair leg frames.
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