Author Topic: Chassis discussion  (Read 1391 times)

prof_braino

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Chassis discussion
« on: February 14, 2013, 09:44:46 AM »
Please post ideas for low cost chassis.  Please include pros and cons.  I can add suggestions to the list in this first post to keep them all together.
List in order so far

  • Custom 3D printed chassis
  • wood chassis
  • foam sheet chassis
  • foam board chassis
  • cardboard chassis

prof_braino

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Re: Chassis discussion
« Reply #1 on: February 14, 2013, 09:47:21 AM »
Custom 3D printed chassis

pros: 
can be adapted to any need
quick to print
plastic very inexpesnve

cons:
needs 3d printer
needs software too chain
needs some skill to operate printer
printer itself is a substantial cost

prof_braino

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Re: Chassis discussion
« Reply #2 on: February 14, 2013, 09:49:12 AM »
Wood chassis

Pros:
can use scrap wood (inexpensive)
very strong
floats
readily availalbe

cons: 
requires hand tools or power tools
must be constructed by an adult or much older children

prof_braino

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Re: Chassis discussion
« Reply #3 on: February 14, 2013, 09:51:23 AM »
foam sheet chassis

pros:
can be purchases at home center store
easy to shape
doesn't necessarily require dangerous tools

cons:
usually must purchase a giant sheet (4x8 feet?)
makes a mess to cut
not so strong


prof_braino

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Re: Chassis discussion
« Reply #4 on: February 14, 2013, 09:53:36 AM »
foam board (per blankenship's foamrobot project)

pros:
stronger than foam sheet

cons:
 more difficult to find than regular foam
how to mount motors? (needs more work to construct?)

prof_braino

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Re: Chassis discussion
« Reply #5 on: February 14, 2013, 09:58:32 AM »
cardboard chassis (per Don K of chibots.org)

pros:
can be harvested from pizza box (so you get to eat a pizza)
can be laminated in layers to make it stronger and physically larger

cons:
requires some skill and expserience to learn to use this medim (learning curve)
requires more time to craft the laminated stock

in at least one way, the cons orf this medium are a pros: one has to experiment and try several times to "get it right" for a particular project.  Teaching kids to experiment and try stuff till they get it right is one of the primary goals of this effort.  Who has has success with this metohd and a group of kids?

prof_braino

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Re: Chassis discussion
« Reply #6 on: February 14, 2013, 10:03:32 AM »
This popped into myu head while entering these items, so I'm going to capture it here:

Foam board laminated with duct tape

after the basic structure is made from foam board. laminate the thing with duct tape. 
If nothing else it would allow the group to uses different colors (theirs an assortment of duct tape colors at Menards)

Pros:
might be stronger than just foam
introduces kids to duct tape.  all engineers and inventors must know about duct tape,  one of the basic building blocks of civilization

cons:
additional cost
introduces kids to duct tape, the bane of proper, long term solutions.

Granz

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Re: Chassis discussion
« Reply #7 on: April 06, 2013, 03:12:33 PM »
Many years ago, Karl Lunt, from the Seattle Robotics Society wrote an article on 'bot bodies (http://www.seattlerobotics.org/library/build-me-a-body.html.)  He discusses several different bodies that he has used over the years (he has build dozens of robots, maybe more.)  Nearly half-way through the article, he begins to describe the main idea in his article: copper-clad PCB and brass tubing.  I've always thought that this was a great idea and have kept it in mind.

Karl is a great writer, and the article is worth reading, just for the entertainment alone, but this idea is one of the all-time-greats.

Garyg

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Re: Chassis discussion
« Reply #8 on: April 10, 2013, 07:41:39 PM »
I'm working on  my 2nd chassis.
Both of them are made using 1/2" plywood because that is the strongest
easy to obtain material.
My platforms end up being very heavy in the end.

I also build things out of fiberglass-epoxy, but that is a very different animal.

I really like the idea of of using copper-clad PCB and brass tubing.
I've never heard of it until Granz post.

Even if for no other use than making stabil brackets for mounting things on.
I'll be trying this!