> -Original Message-
> From: Chris Albertson <mailto:albertson.ch...@gmail.com>>
> Sent: Tuesday, May 14, 2024 9:26 PM
> To: Enhanced Machine Controller (EMC) <mailto:emc-users@lists.sourceforge.net>>
> Subject: Re: [Emc-users] Beam Stiffening?
>
>
> On May 20, 2024, at 6:26 AM, Todd Zuercher via Emc-users
> wrote:
>
> I did to exactly that. With the dial indicator on the ends vs the center, it
> moved 10 times more in the center of the gantry than it did on the ends. I
> will be the 1st to agree that the servo tuning could probably
4, 2024 9:26 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Beam Stiffening?
[EXTERNAL EMAIL] Be sure links are safe.
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 me
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
On 5/13/24 16:47, Todd Zuercher via Emc-users wrote:
Anyone have any brilliant ideas to stiffen a woefully inadequate cross beam on a gantry router
without adding too much mass? What is there now is a 4" x 8" rectangular 3/8"
walled extrusion that is 145" long.
That has got to be north of
See cable beam stifferDo on 3 or 4 sides.Be safeDale
코스피
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On Monday, May 13, 2024 at 08:07:14 PM EDT, Dale Ertley
wrote:
Small blocks on the outside middle of beam on 3 or 4 sides of the beam with
small aircraft cable attached
Small blocks on the outside middle of beam on 3 or 4 sides of the beam with
small aircraft cable attached to each end pulled tight.
Use small turn buckles to tighten the cables over the block on that one
side.You may be able to reduce the mass of the beam with the added stiffness of
the blocks
Can you run a steel cable through it and tension it? Might stiffen it up some.
-- Ralph
On May 13, 2024 1:46 PM, Todd Zuercher via Emc-users
wrote:
CAUTION: This email originated from outside the Walla Walla University email
system.
Anyone have any brilliant ideas to stiffen a woefully
On Mon, 13 May 2024 at 22:50, Chris Albertson
wrote:
> Adding anything inside is the worst place to add material.
Yes, without a doubt, but it seems fair to assume that the ganry has slides
and other components on the outside, but not on the inside.
The base beam has an Iyy (bending in the
Adding anything inside is the worst place to add material. Add it outside.
Stiffness is the cube of the beam thickness, so you really want to make it
bigger.
Then secondary to making it bigger is to improve the shape to remove those
parallel sides.
So it you are just going to epoxy
> On May 13, 2024, at 1:45 PM, Todd Zuercher via Emc-users
> wrote:
>
> Anyone have any brilliant ideas to stiffen a woefully inadequate cross beam
> on a gantry router without adding too much mass? What is there now is a 4" x
> 8" rectangular 3/8" walled extrusion that is 145" long.
>
>
On Mon, 13 May 2024 at 21:51, Todd Zuercher via Emc-users <
emc-users@lists.sourceforge.net> wrote:
>
> I'm less concerned about the actual stiffness and more worried about
> dampening the wobble.
>
Maybe you could epoxy a smaller (aluminium?) extrusion or box inside the
existing one? The epoxy
Anyone have any brilliant ideas to stiffen a woefully inadequate cross beam on
a gantry router without adding too much mass? What is there now is a 4" x 8"
rectangular 3/8" walled extrusion that is 145" long.
Under normal jogging commands the two servos control the ends of this gantry
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