"pyotr filipivich" wrote in message
...
Gunner Asch on Mon, 03 Sep 2018
00:24:37 -0700
typed in rec.crafts.metalworking the following:
On Sun, 02 Sep 2018 18:43:38 -0700, pyotr filipivich
wrote:
"Jim Wilkins" on Sun, 2 Sep 2018
21:06:01 -0400
typed in rec.crafts.metalworking the following:
"pyotr filipivich" wrote in message
news
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.
tschus
pyotr
You need to be clearer about the "wheeled unit".
Your one I-beam and four wheels only makes sense to me if you rig
it
like a tandem axle trailer. If the two(?) wheels on a side are on
a
pivoting bar that lets them adjust to uneven ground then they
share
the load, if their axles are rigidly attached to the I-beam then
they
don't.
Can you guys not answer the question I didn't ask? Grumble,
grumble; kids these days. Just like when I was a boy.
Reevaluating, I'm going to be working with nanobots which will
interlace sort of like legos or ants. So what I want to know, if
each
nanobot can lift a gram, do I need the swarm at one corner to be
able
to hoist 3,000,000 grams, or can they just lift a quarter of that?
I
don't want to have to turn out more than I need is why I'm asking.
tschus
pyotr
--
pyotr filipivich
"With Age comes Wisdom. Although far too often, Age travels
alone."
Lifting one corner...of a structure that is not constructed for
this..means you are transferring a load through the floor joists,
flooring, studs and up through your roof line. IE: **** is gonna
break and come un****ed. Best to leave it flat and slide it as a
whole
rather than loading a radiating point.
There will be four swarms, with a central coordinator. the issue
is: do I need four swarms, each capable of handling the total gross
weight, or can they "share the load", so to speak, and so require
less
per swarm?
--
pyotr filipivich
"With Age comes Wisdom. Although far too often, Age travels alone."
That's a more coherent definition of the problem. 1/2 of the total per
swarm allows for malfunctions, like the other three losing signal and
dropping their corners.
I've moved several neighborhood structures by jacking them up enough
to drive a construction equipment trailer underneath or lifting and
swinging them with chain hoists or my shop crane, so I'm not just idly
guessing how to do it. I have 1 ton tension and 5 ton compression load
cells to actually weigh the building so I don't overstress my
equipment.
Besides the jacks you might consider rounding up timbers for cribbing,
to assemble into supports that won't tip easily like jacks. I have a
stack of the cut-off ends of deck beams and posts from a contractor's
scrap pile. When I take the wheels off a vehicle to work on it they go
under the frame to back up the jacks and stands.
The next lifting project is a neighbor's tool shed whose sills are
Above Ground pressure-treated that have rotted, despite being up on a
concrete block foundation.. For once I'm well equipped with 6" x 12" x
12' oak beams I sawed from trees that had been leaning over the house.
-jsw