Welcome to Misumi's new 19-minute webinar series
for those of you here that are new to Misumi,
Misumi is a global supplier a configurable components
you may ask why configurable? What is it?
configurable components solve the designers the dilemma.
A designer has two choices for components
standard or custom. Standard components have a limited selection
and often force designers to compromise their designs.
These many pluses such as CAD, static part numbers,
fast delivery often seen inexpensive
and convenient. The other choice is custom.
Custom components have many drawbacks.
Designers have to make the solid models themselves and all the manufacturing drawings.
Purchasers too can attest to the long wait for quotes. the expensive set up
charges for short runs and the long lead times.
We are forced to use custom components though - because of the flexibility.
Misumi offers configurable
which is the best of both, easy and flexible.
Configurable components are
easy to design with and purchase. Online select the product geometry desired,
the material and surface finish. Input the size for each configurable dimension
within the range in increments shown.
You'll get a smart part number, instant price, and days to ship
and the CAD model. All of this configurability
is available with are over one million components,
available at Misumi USA dot com
Now I'll turn it over to our Misumi engineer.
Hi this is Chris Blaszczyk, I'm the product Development Manager with Misumi's
Standard Components team.
Today we're going to talk about Linear Bushings.
Linear Bushings are components used to achieve precise linear motion.
This is accomplished as the Linear Bushing travels along
a precision Linear Shaft with help of rolling elements.
All rolling surfaces are hardened and ground.
In this recirculating ball design, which allows you to use Bushings without
any stroke limitations. Generally
you need a set of two shafts and at least
two Bushings in order to prevent the assembly from spinning
along the axis of the shaft. This is a typical application where
two Linear Bushings are attached to one plate
which is driven by a Ballscrew. The Shafts and Ballscrew
are usually supported on both ends with Ballscrew and Shaft Supports.
The straight Bushings we offer come in 4 different lengths:
short, single
which is the most often use Bushing,
medium
and the double length. You can also choose from
standard diameter and a compact diameter which is
a good space saving option. There are several mounting options for straight
Linear Bushings.
You can use a counterbore hole with use of one
Linear Bushing spacer and an internal retaining ring.
You could also used two of these internal retaining rings
at each end. External retaining rings
are another way to mount our straight Bushings. Each Bushing is
already equipped with two retaining ring grooves on its
outer diameter. Another option is to use
our external fixing plates. In this case the fixing plate
is holding the outer race of straight Linear Bushing.
These fixing plates can also be used
with our standard retaining ring grooves. One great advantage of using
a fixing plate this way is that
it is mounted on the surface of the housing and as a result,
you may only require one of these per Bushing. Please note
that our fixing plates will not fit the grooves
of our compact size Linear Bushings. Our flanged Linear Bushings come in
three flange shape styles. Round flange,
square flange and compact flange
the number of mounting holes depends on the Bushing diameter.
You can also choose from three different flange positions:
standard, piloted
where you mount the left side of the Bushing with the flange
inside the housing hole. And with flange in the center
the pilot side is again on the left side of the Bushing.
There are also some in four different lengths.
Single, medium
double and long. We offer three shapes
of Pillow Block style Bushings: tall which is very unique and offers you
two different ways of mounting for your Bushings. Using a threaded hole called
M-1
on top of the block or using a counterbore hole
called M-2 mounted from the side.
This counterbored hole is also threaded on the opposite side
which allows you to mount the Bushing to the plate with either
threaded or clearance hole.
The clearance hole always accommodates the mounting bolt
that is one size smaller from the one that you would
use with the threaded hole. Next is our Wide Style
and at last the Flanged style. We also offer five different lengths
Single length - which is our most compact type
medium length, double length
medium-long and long.
Please note that every option from medium to long
uses two straight bushings. The only difference between them
is the spacing between those two bushings. The longer the space, the more
stable you design becomes.
It is also very convenient and allows you to save
machining and alignment time if you would like to use two bushing on
each shaft. Our short stroke Bushings are offered in two
general shapes. Straight Bushings
which are available in single type and and in a double type.
Please note that these bushings are not recirculating ball design.
The stroke is limited and please remember that our single type
is the unit with less balls, but at the same time
its stroke is twice as long as our double type Bushing.
The name is a little bit deceiving, but single and double refers to the number
of balls in contact with shaft.
You can also select flanged short stroke Bushings and these are
available in single and double type as well.
We offer two styles of flange shapes:
the round flange and compact flange -
if you would like to save some space.
Please remember that these Bushings have relatively short stroke.
One of their advantages is that they could be used
not only in linear, but also for rotary
or oscilating applications. Our Linear Bushings with lubrication units are
available in straight version -
with single and double length as well as
in flanged version with round, square and compact style flange.
These are sealed bearings with integrated lubricant fiber pad,
so they are pre-filled with grease as opposed to our standard Bushings that
typically come with light anti-corrosive
oil film. Linear Bushings with MX units
allow an extended maintenance period.
They can also last up to two and a half (2.5) times longer comparing to our standard
Bushings,
because the caplilary action allows
appropriate and uniform distribution of lubricant
to the contact surfaces, service intervals
are significantly extended. Note that while installing the flanged unit,
the MX lubricator feature cannot be used as a mounting pilot.
Bushings with clamps are a recent addition to Misumi linear bushing line.
We offer them in Tall block option -
also with two different top inside mounting options -
with side counter bored holes that are also threaded.
Wide block style can also be purchased with clamp,
you can find more compact
flanged option. All styles come with single or double length
and with clamps mounted on either the right or left side.
Here are some design examples of how these units can be used
within an assembly. Tall block - this time mounted on top.
Wide block and the flanged Bushing - in this case customer is using two clamps to
increase the clamping force.
How is the maximum clamping force defined? Here is how we tested this force.
The collar is tightened to the torque value
shown in the chart on the actual product page,
then compressive load is applied with the tester.
The compressive load where the shaft begins to move
is defined as the Maximum Thrust Load. We tested the thrust load of linear
Bushing
that was greased. This is a very convenient design. With one part number
you will replace six separate parts,
of which - two housing and the clamp - would need a manufacturing drawing.
To summarize, we have three main Bushing shapes,
straight, flanged and housing type. The bushing lengths available are
short, single, double and long - we offer other options for some
of the other products. The Bushings are
available in 52100 bearing steel or 440C stainless steel.
We either offer no surface finish, electroless nickel plating
or low temperature black chrome plating. Standard Bushings come with light rust
protection
oil film, but customers can fill them with
with lithium soap base grease.
L, G and H type grease are also optional.
All together we offer 865 different types of Bushings.
This does not even include all available
sizes: but just types. We actually stock
most of the Bushings as well. I'm happy to say that we have far more options
available in stock than
any of competitors. Just to show you how popular our Bushings are
we sell over 6,000 of our linear
ball bushings every working day around the World.
We offer the following types of pre-greased bushings:
ET-100K that's what
we call L-type grease that has
high heat resistance and oxidation stability.
LG2, the G-type grease
that is suitable for cleanroom environment. And
FGL we call it the H-type grease
that meets the demands of food, beverage and medical industries.
You will also find the performance and particle generation information for the
lubricants we offer
in the beginning of the Linear Bushing section of our catalog.
Misumi linear bushings are actually manufactured by Misumi group.
Every single bushing leaving our factory goes through a variety of tests.
They're inspected for ID, OD verification of the retainers
and are tested for smoothness of motion. We have an
excellent quality record with two defects per one million
Bushings sold. Our standard g6 shafts are always recommended with
Misumi Ball Bushings. We also offer the h5 tolerance shafts.
These are designed for an interference fit, but the life of the product will
decrease.
here is the comparison between Misumi shaft and Bushing fit
and the fits for a couple of our competitiors. Let's start with the inch
sizes.
Misumi shaft and Bushing fit is a transition
meaning that the bushings and shafts are designed to run on minimal clearance to
small interference
Competitors fits are always clearance fits.
Our design allows for much more precise positioning and more rigid design.
When we compare the metric sizes the situation is very similar.
Again Misumi's fit is a transition fit and competitors fit
is always a clearance. Please note that Misumi offers precision linear shafts
that are f8 tolerance. These shafts
are typically made out of 1045 carbon steel or
304 stainless steel with minimum of 10 microns of hard chrome plating.
These shafts are designed for our plain bushings only.
the surface treatment is very hard but the shaft
material is not, it's soft. If you'd like to use Ball Bushings with one of the shafts
the shaft surface will be damaged within the first few strokes
of the Bushing. As to our lead time, the bushings with special grease options
ship in 8 working days, while all
other Bushings are either stocked or shipped in 3 working days.
Our catalog also provides information about calculating
the life span all the linear motion systems depending
on the application conditions or motion profile.
This is one of the application examples where our customer used a 30
millimeter compact flange linear bushing
with the long pilot in vertical orientation.
The system is moved with use of a cylinder
and moves an insertion station
up and down. In this case, the shafts are supported with custom
end plates on each end. The Bushings are actually stationary,
while the shafts and end plates are moving.
In this example, one of our customers uses as a wide pillow block bushings
two on each shaft. To move the tail stock
of the miniature Manually lathe.
As you see two of the pillow blocks are mounted to the plate
that is secured to a manually driven lead screw nut.
Each shaft is also constrained with a shaft support
at each end. You can purchase shaft supports
with configurable height and control the mounting
height of each pillow block within 100 micron
increments. This is a gantry application, where the customer utilizes three
straight linear bushings
that are embedded in a custom-made housing.
There are two linear shafts, one on top and one more on the bottom.
The system itself is moved with a stepper motor that the drives
an endless belt. The belt and the bushings are attached to the same
carriage.
The reason that customer is using the belt design
and not a lead screw or ballscrew is the speed the requirement.
Belt mechanisms are capable of achieving higher speeds
but are not as accurate as lead screw or ballscrews.
This is a unique application where two linear bushings are mounted on shafts
and the shafts are in line with two ball screw units.
The ballscrew nuts have a double function -
they drive the unit, but also are part of the carriage support.
The two top plates are connected together - you can't see it in this
picture actually. Please note: that in order to use two ballscrews
in one axis assembly, each ballscrew
needs to be driven by a separate motor, each of them
also needs a linear encoder and both motors have to be synchronized.
The reason is that each ballscrew is always manufactured with lead error
tolerance. While Misumi says Linear Bushings on their website
we also provide free CAD models. To download the CAD model, first navigate to
the linear motion
and then to Linear Bushings. Pick with flange and pilot
and then flanged Linear Bushings, compact pilot single
with counter-bored mounting holes from the right side.
At this point the part needs to be configured to the specific size required.
Do this by making selections on the left side frame.
When you first get to the web page you will notice to the part number shows many
results.
Then pick the inner diameter, for example 10 millimeters,
select compact flange and no grease option.
Once all selections are made, the part number will change from
showing the number of the results to a specific Misumi part number
for the specific configuration selected.
At this point you can click on the price check button
to see the price of the part as configured.
keep in mind that this will only show one piece pricing, the volume discounts
are not taken into consideration.
To download the CAD model, click on the CAD download / preview button.
Then click on the CAD data download button.
From there you will be taken to a page where you can select the CAD format
and download the CAD file. You can also preview the part
using our online viewer.
Thank you and we hope you enjoy today's webinar.
All of Misumi's configurable components and one million products are available
at www.Misumiusa.com
If you are new to Misumi, register for access to CAD downloads,
online formal quotes and orders and manage
all of your account histories. For first-time companies purchasing
you can receive thirty percent off. Full support is also available.
Technical help at engineering@misumiusa.com.
Customer service at inquire@misumiusa.com and your local account manager at sales@misumiusa.com
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