I think I fell for the “beam is bending” idea too. It might be. The way to
find out is to measure the beam center with the dial indicator and then measure
the ends of the beam. It might be that the entire beam is moving
Is the gantry belt driven? Long belts can act like springs. The
On 5/14/24 14:34, Eric Keller wrote:
Do something cheap because I'm not convinced it's the beam. I've done
troubleshooting on things like this, and sometimes it's stiffness and
sometimes it's not stiffness. But it really doesn't make sense that it
would sit there and ring after a move, so you
This is why I’m a chemist not an engineer. So how does it break out cost vs
results, not exactly the same as weight. Even tho it is not an aircraft app
working towards lightness may make sense. Thanks for the elucidation. Really
happy it is not my problem. ;-) A Boeing engineer once commented
Do something cheap because I'm not convinced it's the beam. I've done
troubleshooting on things like this, and sometimes it's stiffness and
sometimes it's not stiffness. But it really doesn't make sense that it
would sit there and ring after a move, so you also may have some
tuning to do.
Hi all,
Since I’m cheap I’d prototype with a fiberglass tube and fill with urethane
foam. How much does the modulus change between a rectangular tube and
elliptical geometry?
Box with corner braces that are viscous damped. It all comes down to load and
frequencies.
I’m just the aging dummy in
This kind of design “works” only if you make the overall dimension MUCH larger.
It is an overall more efficient design but bmovimng material does not add
streght of stiffness. You would need to do something like scale the beam up to
maybe twice its size then cut away half the metal.
The
A triangular tube with an isogrid pattern cut into it to reduce mass without
sacrificing stiffness. Could have it laser cut with slots on the fold lines to
make it easy for a sheet metal break to fold accurately. The design could have
tabs and slots to interlock on the joining edge. Then TIG
