**********MASSPROP VARIABLES**********

[RANDY38309]

CAN ANYONE TELL ME HOW I CAN CHANGE THE
DENSITY VARIABLE FOR MASSPROP.
I AM GETTING A RESULT OF .058 FOR A SOLID
I DREW, BUT I CANT TELL IF ITS OZ'S OR LBS
I NEED TO FIND THE VARIABLE THAT ALLOWS ME TO
CHANGE THE DENSITY FOR THE MATERIAL I AM USING
(ALUMINUM).
I AM USING ACADR13C4, WINDOWS 95.

[Dave Hinrichs]

Unless you are using Mechanical Desktop there is no variable. The
default density is 1. thus multiply you .058 number by the appropriate
mass for aluminum in the units you want.

DAve

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[Dennis Shinn]

randy...@aol.com (RANDY38309) wrote:

>CAN ANYONE TELL ME HOW I CAN CHANGE THE
>DENSITY VARIABLE FOR MASSPROP.
>I AM GETTING A RESULT OF .058 FOR A SOLID
>I DREW, BUT I CANT TELL IF ITS OZ'S OR LBS
>I NEED TO FIND THE VARIABLE THAT ALLOWS ME TO
>CHANGE THE DENSITY FOR THE MATERIAL I AM USING

The mass properties of ACIS solids in R13 are returned as unit values. Meaning
volume is returned in default drawing units which in the case of using Imperial
or English units would be inches. You'll notice that the mass is the same as the
volume; mass is considered to be unity in R13. There are no system variables nor
is there a units file as there was in R12 AME that would allow you to define a
particular material.

What I've had to do to figure concrete weights for the precast I do is take the
volume and apply it to a formula in an AutoLISP routine that converts to
kips/tons. I also convert the cubic inches to cubic yards for quantity take-off.

I have a short routine that was contributed by another reader in this group that
I'd be more than glad to share with you that extracts all the mass property
values to a file (which is an option in the mass properties command, actually)
then you can read them back in and minipulate them as you wish.

Dennis Shinn
Seattle AutoCAD User Group
CAD Systems manager/GLY Construction
(remove "!" from return address for replies)