Manufacturing Today - January/February 2014 - 31

Barnes Industries Inc.
Midwest

www.barnesballscrew.com / Headquarters: Madison Heights, Mich. / Employees: 47
Dave Farr, chief engineer and GM: "We are able to more competitively price mass-produced screws."

High
Load
barnes industries inc.
manufactures and
reconditions ball
screws. by russ gager
When a ball screw needs reconditioning, Barnes Industries Inc. not
only fixes it, but also determines why
it needed reconditioning. Frequently,
Barnes' analysis will indicate a problem with the machine on which the
screw operates, and the company will
inform its customer that correcting
that machine problem will extend the
life of the ball screw.
It is that expertise that has kept
Barnes Industries Inc. prospering
since its founding in 1969. Barnes
Industries strives for continual
improvement in every ball screw
application for every customer no
matter what size. In pressing forward, Barnes Industries will be an
exhibitor at the 2014 International
Machine Tool Show (IMTS) in
Chicago, Sept. 8 to 13 (booth No.
2168). The company's displays will
be very educational and its executives will be giving seminars on
increasing the life of ball screws.
Ball screws are used in all types of
machines, including manufacturing
machines that are operated by computer numerical controllers, such as
grinders, presses, forging, metal cutting, transfer machines and even used
in power generation plants. "Anything
where there's motion, especially precision motion, has a ball screw,"
explains Dave Farr, Barnes Industries
Inc. chief engineer and general manager. "Somebody dreams up a new
application almost every day."

in the milling department,
all ball nuts are machined
prior to heat treating.

Ball screws operate like a screw
and a nut. The nut travels up and
down the screw or is stationary as
the screw moves in and out of it. The
nut frequently holds the device the
screw is moving or moving out of,
such as a plastics injection mold.
Precision ball bearings roll inside
the threads of the screw as it rotates
- hence the name, ball screw.
"The balls are the only contact
between the screw and the nut," Farr
says. "As the nut travels down the
screw, it's only riding on the ball bearings. So the nut moves back and forth,
or the nut may be stationary and the
screw moves in and out of it at any
angle. The ball bearings make the
motion very smooth. It's mainly used
to convert rotary motion to linear
motion or vice versa, which would be
backdriving - when you turn the
screw, the nut travels to move a
machine slide."

Wherever there is motion between
metal components, lubrication helps
ease the interface. "There has to be
some kind of lubrication," Farr
points out. "It is very similar to the
bearings in any other kind of shaft or
motor or axle on your car. You've got
the bearings that hold the wheel on,
and they need to be grease-packed. If
you run without lubrication, they will
fail very early. The life of a ball screw
drops by 85 percent if you do not have
any lubrication at all. We prefer oil,
but there are applications where you
need a light grease."
Very few ball screws run without
lubrication. "You have to overdesign
the nut assembly to make up for the
lack of life you'll have from no lubrication," Farr stresses. "Those are very
few and very light-load applications."
Barnes Industries specializes in
high-load capacity and high-speed
applications. "There aren't really
JANUARY/FEBRUARY 2014 manufacturing-today.com

31


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Table of Contents for the Digital Edition of Manufacturing Today - January/February 2014

Table of Contents
Manufacturing Today - January/February 2014 - Cover1
Manufacturing Today - January/February 2014 - Cover2
Manufacturing Today - January/February 2014 - 1
Manufacturing Today - January/February 2014 - 2
Manufacturing Today - January/February 2014 - Table of Contents
Manufacturing Today - January/February 2014 - 4
Manufacturing Today - January/February 2014 - 5
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