Extending Linkage
by WilliamAAdams, published
1418
782
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Description
After seeing the original, I thought, I've always wanted to play with something like that.
This thing isn't so much a derivation of the original, as much as a reconstitution. It provides for a good parametric basis for creating other such things.
You can specify the size of the bar in one place, and the handles and grippers will adjust accordingly.
The arm has a cutout to reduce the amount of plastic used to print the thing. This is a good savings, and in these sizes, it doesn't really change the strength dynamics.
The handle and grip are a friction/slip fit. If you want permanence, simply glue it on. If you want the 'gripper' to be able to rotate, then just make the opening wider, or come up with your own gripper.
A good strategy might be to put a dimple inside the gripper, or the handle, to grab onto the hole in the linkage (arm).
I thought about printing a pin. But really, a 3mm piece of filament makes for a fine pin. I'm whimping out of course, and perhaps I'll add one later.
This thing isn't so much a derivation of the original, as much as a reconstitution. It provides for a good parametric basis for creating other such things.
You can specify the size of the bar in one place, and the handles and grippers will adjust accordingly.
The arm has a cutout to reduce the amount of plastic used to print the thing. This is a good savings, and in these sizes, it doesn't really change the strength dynamics.
The handle and grip are a friction/slip fit. If you want permanence, simply glue it on. If you want the 'gripper' to be able to rotate, then just make the opening wider, or come up with your own gripper.
A good strategy might be to put a dimple inside the gripper, or the handle, to grab onto the hole in the linkage (arm).
I thought about printing a pin. But really, a 3mm piece of filament makes for a fine pin. I'm whimping out of course, and perhaps I'll add one later.
Recent Comments
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The gripper part is deceptively difficult to design isn't it. Not only do you have to offset based on the thickness of the bar and the orientatin of the bar, you also have to worry about the breadth of the bar and the contact angle of the gripper.
1418
782
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Instructions
1) Print an even number of 'linkage' segments (2, 4, 6)
2) Assemble your links by placing a pin in the middle of two pieces and pins in the ends of pieces if you have more than 2, to form an "accordian"
3) Print a couple of handles, and place them on one end
4) Print a couple of grippers, and place them on the other end
5) Play with your new toy
See the original for a nice picture, and look at how it goes together.
The .scad and .stl provide for easy mash-up fodder.
2) Assemble your links by placing a pin in the middle of two pieces and pins in the ends of pieces if you have more than 2, to form an "accordian"
3) Print a couple of handles, and place them on one end
4) Print a couple of grippers, and place them on the other end
5) Play with your new toy
See the original for a nice picture, and look at how it goes together.
The .scad and .stl provide for easy mash-up fodder.
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The gripper part is deceptively difficult to design isn't it. Not only do you have to offset based on the thickness of the bar and the orientatin of the bar, you also have to worry about the breadth of the bar and the contact angle of the gripper.