"Jim Wilkins" on Mon, 3 Sep 2018 09:24:28 -0400
typed in rec.crafts.metalworking the following:
"pyotr filipivich" wrote in message
.. .
Gunner Asch on Sun, 02 Sep 2018
15:03:32 -0700
typed in rec.crafts.metalworking the following:
On Sun, 02 Sep 2018 13:35:26 -0700, pyotr filipivich
wrote:


I may have asked this before, but I have A Project in mind. This
is much simpler than the last time, when I wanted to build 4
humanoid
robots to pick up a shipping container at the corners and move it.
"Hup, hup, hup, ... detail halt!"

What I want to do this time is to just "slide an I-beam under the
outbuilding, attach a wheeled unit to each end, pivot the building
and
roll it to when I want it." No doubt "A simple procedure
involving
lasers." I'm sure. Somewhere.

But, my question is: load capacity of the units. Assume a GW of 3
tons, does that meant that each wheeled unit has to be able to
'carry'
a three ton load, or can I divide the gross weight by 4, add a
"fudge
factor" and hope for the best?

This is one of those things I'd talk to one of the old guys, but I
find I am one of the old guys.

What are the dimensions of the building, is it empty or full, what
is
the floor construction and how far do you need to move it in a
lineal
direction?

One is 10'x16'by16' high, "framed" floor with 9/8 T&G flooring
glued & nailed. It's rotating 90° and moving ~20 feet more or less.
The other is 10'x12'by10' high. Also going to be rotated, but
moved about 30 feet.
The Big One is 26 by 32 and two stories. It is jut going to get
rotated. But I might add a basement while I have it off the piers.

Once the preliminaries are done, then Ill be scaling down to move
my footlockers around. (I had this idea for a camp setup, using a
20' shipping container as a base, and outfitting the Clanks with
appropriate livery, depending on if I'm reenacting medieval or
Steampunk. But that's a digression.)


What I'd really like to know is: how do I calculate the load
bearing capacity needed by the robot which is going to pick up the
corner.
--
pyotr filipivich
"With Age comes Wisdom. Although far too often, Age travels alone."

If you pick up one corner of a uniform thickness rectangular plate
half the weight will rest on that corner, the other half on the
opposite one.

A stationary plate can be modeled as a single point mass at the center
of gravity with levers reaching out to the corners.
http://web.mit.edu/4.441/1_lectures/..._lecture5.html


Thank you.


--
pyotr filipivich
"With Age comes Wisdom. Although far too often, Age travels alone."