Bolt and Nut
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Does anybody know if someone has made a working model of a nut and bolt using SP?
I'm working on a model of replica Gutenberg printing press and the dynamic part is the large wooden screw assembly that puts pressure on the paper against the inked type. So the screw mechanism is critical. Nobody knows exactly what the press looked like, but it was based on a wine/cider press that was already in existence. It probably looked something like this:
Thanks for any help,
Tom -
I'm going a little crazy with my screw mechanism. The model as it stands now is attached. The green barrel should screw down the red screw, but, while the two can spin around each other, the screw surfaces don't interact/collide.
Any ideas would be greatly appreciated.
Thanks,
Tom
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I think you are almost there. FIrst comment is that the external cylinder needs to be built like all objects with a "void", as a set of incremental strips or elements. Second comment is that each of the screw mechanisms (already defined as incremental strips (convex hulls) need to be defined as "default" not cylinder. In my playing around I got the mechanisms to interact by attaching one to a motor and the other to a passive slider. I'll try to reassemble the whole thing back together and post what I have. Inspiring work!
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Thanks, MPTAK. That's fantastic. I downloaded your model and can easily see how it works. I'll take you Mechanism and build the structure around it. When the whole printing press is finished, I'll be sure to give you a credit for your help.
Thanks again,
Tom -
The printing press is still a work-in-progress, but here's what it looks like right now:
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They tell us that we are living in an era reminiscent of the time of the Guttenberg press....now I know what they mean. I think the mechanism is all yours but will be interested to hear of the construction process. I think that while boxes and spheres can be scaled along various axes and still retain their sketchy integrity I'm not sure the same is true of convex hulls.
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You could be right. I tried scaling down your working version and it quit working.
There's another problem as well: as you can see in the photo above, the "nut" part is stationary in space while the "bolt" part must both turn and slide up and down.
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I'm making some progress. The attached model rotates and slides, but now I need to figure out some keyboard controls for the simulation. This one is based on a working nut and bolt model by sofie9536:http://sketchup.google.com/3dwarehouse/details?mid=9910da9a33ee78c8c17e81e068e37f73&prevstart=0
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I could be wrong but I still think the base cylinder needs to be defined within the group as a cylinder and not default. Glad you are making progress. So how do you make the incremental pieces of the screw teeth?
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First I drew the two spirals 180 degrees out of phase and superimposed them on a central cylinder. Then I selected the band on the cylinder between the two spirals. Next I selected the other band moved it away from the original cylinder and scaled it down to 90% in both horizontal directions and put it back into the original position. Using one side of each of the spirals, I built a box that fit the two curves. I made the box into a component and set the Shape to ConvexHull. I then copied the component 31 times and lined them up to make a 3D spiral.
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