is shaping up to be a very exciting year at ASPE.
on our momentum from two sold out topical meetings in 2010,
ASPE has teamed up with euspen to organize
a joint topical meeting in the spring of 2011 on Structured
and Freeform Surfaces. Over 40 submissions have been received
for what promises to be our third consecutive sold out topical
meeting. We are also working on a second topical meeting for
this coming summer.
Annual Meeting is being held this year in Denver, CO from
November 13 to November 18, 2011. Coincidentally, ASME is
also holding its annual meeting in Denver a few city blocks
from ASPE's Annual Meeting. We are exploring ways to build
on this confluence of precision and mechanical engineers.
When we first considered starting a new society in 1986, one
of our options was to start a new division in ASME. While
we did not go that route, there are some areas of common interest
and I am interested in any ideas you may have to interact
with them in Denver.
will be a year of changes. The website will be updated very
shortly for easier navigation and access to past conference
papers. The website offers an updated look signifying the
move into our second quarter century of service to the precision
ASPE Board of Directors is also looking for ways to improve
and grow ASPE's influence in American manufacturing. Your
ideas are invaluable to mold ASPE to fit your evolving interests
and needs and to attract a broader membership base into ASPE.
look forward to hearing from you and seeing you at an ASPE
Meeting in 2011.
wishes and a Happy New Year.
Dow, Executive Director ASPE
#3: KINEMATIC MOUNTING*
manufacturing requires precise motions. Rigid body motion
has six degrees of freedom, XYZ and rotation about these axes.
Therefore when motion is required, the non-motion degrees
of freedom, six-minus-n motion degrees, must be fixed. If
a machine/instrument is constrained in more than six-minus-n
ways, stresses and strains will occur, decreasing performance.
Mounts that are constrained to six-minus-n motion degrees
are called Kinematic Mounts.
loads are high, robustness and stability demand more constraint
and loss of precision can occur. The loss of precision can
be minimized through manufacture of over-constrained degrees
of freedom to exceptional tolerances minimizing stresses and
inter-connecting the over-constrained degrees of freedom elastically.
But this is usually obtained at the expense of increased cost.
#3: Connect mating elements of a machine/instrument
such that the number of constraints is equal and only equal
to six minus the number of degrees of freedom required. If
load conditions, robustness or stability cannot be met with
kinematic design, employ elastically inter-connected, over-constrained
pattern: ABBE (ALIGNMENT) PRINCIPLE
on "Patterns for Precision Instrument Design", a
classic ASPE tutorial by C. Teague, C. Evans and later D.
Swyt. It uniquely identifies 12 foundational mechanical concepts
or patterns driving precision in fabrication, assembly and
American Society for Precision Engineering promotes the
future of manufacturing in America by advancing precision engineering;
though supporting education; and encouraging the development
and application of precision principles.
founded in 1986, is a non-profit organization.
here to learn more about ASPE.