Welcome to Misumi's New 19-Minute Webinar Series.
For those of you here that are new to Misumi,
Misumi is a global supplier of configurable components.
You may ask, why configurable? What is it?
Configurable components solve the designer's dilemma.
A designer has two choices for components; Standard
or Custom. Standard components have a limited selection
and often forced designers to compromise their designs.
These many pluses such as CADs, static part numbers,
fast delivery, often seem 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 and 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 our over one million components,
available at misumisa.com.
Now I'll turn it over to our Misumi engineer.
Hi, my name is Yau-Han from the engineering department at Misumi USA.
In this session, we will be focusing on Misumi's Rotary and Drive Shafts.
One of Misumi's key product offerings is our shafts and rods
that differ in price point and tolerances from their different applications.
One of the more popular options is our rotary and drive shafts.
I'll be going through some of the unique features and benefits of rotary and
drive shafts
offered by Misumi in this presentation. Misumi also offers a wide range of
supporting products such as bearings,
housings, couplings, and many other rotary power transmission components to
complement our rotary and drive shafts.
Misumi rotary and drive shafts are offered in diameters ranging from to 2 to 50
millimeters,
and lengths of up to 800 millimeters. Rotary and drive shafts
share many similarities, but there are some key differences between the two.
Rotary shafts are usually sufficient for general applications,
and is the more popular option of the two. Rotary shaft tolerances are slightly
lower compared to the drive shafts,
making drive shafts more suitable for higher-speed and higher accuracy
applications.
Many of our customers prefer the drive shaft option for more critical
applications,
such as direct mounting to a drive source. Drive shafts also offer many
additional machining alterations not offered on the rotary shaft line-up.
However, rotary shafts are available in longer lengths
and in inch sizes. The key difference between rotary and drive shafts
is the tolerance range, so I will begin by reviewing their technical
and tolerance specifications. The first tolerance standards I will discuss
are the straightness and circularity tolerances. These tolerance standards are
very important because it ensures that the shaft will rotate accurately
without causing vibration. The straightness tolerance is 0.01 millimeters per 100
millimeters of shaft length
for both rotary and drive shafts. Please note that
our smaller shaft options with diameters 2 and 2.5 millimeters
have a straightness tolerance of 0.1 millimeters per 100 millimeters
of shaft length. The D section circularity tolerances can be seen on the charts to
the right,
where rotary shafts have a circularity tolerance of as low as 4 microns,
and drive shafts have a tolerance of as low as 3 microns.
Also measured are the concentricity and perpendicularity of the shafts.
As per the diagrams, the perpendicularity tolerance measures
the shaft's length against the end face surface of the larger diameter.
The deviation should not exceed 0.05 millimeters for rotary shafts
and 0.01 millimeters for drive shafts. The concentricity tolerance measures the
difference between the circularity on the different steps above the rotor
shaft
and ensures that the step is centered properly. An acentric step is not ideal
for smooth operation,
as it will cause the shaft to rotate off-center. Rotary shafts have concentricity
tolerance
of 0.06 millimeters, and drive shafts, 0.01 millimeters.
The next tolerance specification is the length tolerance, that is typically not
as critical for rotary shafts, because the shaft ends can protrude through a support
hole,
such as a bearing. The length tolerance for rotary shafts can range from
+/-0.1 to 0.8 millimeters.
Drive shafts, however,
are normally direct mounted or coupled, so the length tolerance may be more
critical,
and has a tolerance of +/-0.1 to 0.2 millimeters,
depending on the length of the shaft ordered. Misumi rotary shaft diameters
follow the JIS Shaft Fit tolerances.
The available tolerance specs are H9, H7,and G6,
as seen in the chart. Drive Shafts also follow the JIS standard,
and are available in H6 and H7 tolerances.
These tolerance ranges are a snapshot of the JIS shaft and Housing fit tolerance chart that
can be found online and
in the technical section of the Misumi catalog.
These tolerance ranges are important to ensure the proper bearing fit
for your application.
Notice that the JIS standard is called up by a lower case letter. In the JIS Shaft
and Housing Fit standards,
the lower case letter represents a shaft, or an OD fit tolerance,
and the upper case letter will represent the housing or hole tolerance.
To help you assist in your tolerance selection, you can use this chart
found online and in the technical section of the catalog.
This chart shows some fit characteristics and some application examples for
guidance
on selecting a proper shaft and bearing fit combination that best suit your
needs.
After reviewing your different fit options with the previous chart, you can
reference the JIS
Housing Fit chart to achieve your optimal fit required. On the left column of
this chart, you'll see the shaft fit represented with a lower case letter as
mentioned earlier,
and the corresponding bearing fits for the different combinations.
This second chart gives you a visual of the kind of clearance, transition, or press fit of
the final selection you make. These charts are also found in our technical
section of the catalog and online.
Now that you have heard about our tolerance and fit selection information,
let's take a look at our rotary shaft
options. Misumi offers our rotary and drive shafts
in a variety of different material options.
Misumi rotary shafts are offered in 1045 carbon steel and 304 stainless steel.
The 1045 carbon steel option must be selected with a black oxide or
electroless nickel plating surface finish.
The 304 stainless steel option does not have a surface treatment option available.
Like the rotary shafts, Misumi's drive shafts are also offered in 1045 carbon steel
and 304 stainless steel.
Again the 1045 carbon steel option must be selected with the black oxide
or electroless nickel plating finish. The 304 stainless steel option for drive shafts
also does not have a surface treatment option available.
Misumi also offers our drive shafts with an induction hardened option, as
drive shafts are sometimes used directly mounted or coupled to a drive source
and some times requires extra strength. As did previously,
all Misumi 1045 carbon steel shafts come treated with either a black oxide or
electroless nickel plate coating
The black oxide coating adds mild corrosion resistance and prevents light
reflection.
A great feature of this coating is that it does not alter the dimensions and does not
peel
or chip. It is also the less costly option of the two.
Electroless nickel plating is the better option if additional corrosion resistance
is required,
and also offers additional hardening for better wear resistance.
Misumi also offers all of our rotary shaft options in 304 stainless steel, which is
our best option for corrosion resistance.
This is not a surface treatment, so a key advantage is that there's no potential
for chipping
or flaking. This option is best suited for food and clean room applications.
304 stainless is also non-magnetic. For our drive shafts,
we offer an induction hardened option that increases the surface hardness to about
50 Rockwell C
for better wear resistance. This process also increases the strength of the
material for more demanding applications.
Now that you're familiar with Misumi's shaft types, materials,
finishes, and basic fit selection process, you can now move to the next step and
take advantage of our unique business model to select the exact shaft
you need. Misumi offers many end shapes and features in which the blue
dimensions can be configured in as little as 0.1 millimeter increments.
Each specification you make will be represented by a digit in your
universally recognized part number.
This is just a glimpse of the variety of rotary and drive shafts that we offer.
With Misumi, you are not restricted to a set shape or dimension.
You can configure each end of the shaft differently with finishes
like double stepped, tapped ends, threaded ends,
stepped with a retaining ring groove, multiple key ways,
and many other variations that are configurable to meet your unique design
and application needs.
Misumi categorizes our rotary shaft selections by the different end shapes
and features of the shaft, but sometimes multiple features are required,
so we offer additional machining alterations to help further configure
your shaft
to the exact design requirements. This first alteraion I will discuss is a very common
feature added to rotary shafts.
This alteration adds one or two keyways to shafts where they are not already a
standard feature
of the basic shape. Keyways are used in combination with a key to prevent
relative rotation
between two components and allows for torque transmission.
The location and length of the keyway can be configured in one millimeter increments
anywhere along the length of the shaft but cannot run the entire length of the shaft.
The keyway dimensions are controlled by JIS Standards, and all Misumi rotary shaft keyways
are machined to an N9 tolerance, which can be paired with the appropriate keystock.
The chart shows the dimensions and tolerances of each keyway based on the shaft
diameter and
can be found online or in the Misumi catalog. You can also get the keyways on
the stepped ends
of our shafts. One or two set screws flats can be added anywhere along the length of
the shaft.
The position and width of the flat are configurable in one millimeter
increments.
The flat is typically used to prevent the round surface of the shaft from
being dimpled
when clapping the set screw in place, and also adds additional surface area for
better clamping force.
Misumi also offers an alteration that allows you to add two set screw flats at an angle
in the same location,
configurable in 15 degree increments from each other.
This alteration adds a set of wrench flats in a position anywhere on the
shaft in one millimeter increments.
However, the widths of the flats are predetermined based on the diameter of
the shaft.
These flats allow you to easily grip the shaft with a wrench when additional tightening
is required.
You can add a slit cam groove to your rotary shaft to help guide a cam
or cam followers. The location of the slit cam can be configured in one
millimeter increments
along the length the shaft. You can add retaining ring grooves to many of our
rotary shafts.
The location of the grooves can be configured in one millimeter increments,
but the width of the groove is predetermined based on the shaft diameter.
Misumi always includes the appropriate retaining rings, which are also available
separately.
The standard thread pitch is always coarse for Misumi shafts. This alteration
allows you to change a thread pitch
to a fine thread when necessary. Another alteration can reverse the threads from
right to left,
and Misumi also offers an alteration that adds an undercut to the threaded
portion of the shaft.
From the Misumi accuracy standards part of the presentation, we learned that
Misumi offers length tolerances ranging from +/- 0.1 to +/- 0.8 millimeters,
depending on the length selected. This alteration improves the length tolerance to
+/- 0.05 millimeters
for shafts less than 500 millimeters, and +/- 0.1 millimeters for shafts
equal or greater to 500 millimeters.
Also mentioned in the Misumi accuracy standards section of this presentation,
the standard concentricity tolerance is 0.06
for rotary shafts. This alteration will improve the concentricity tolerance to
0.02
and is ideal for applications where it is critical, such as high-speed
applications.
Just like rotary shafts, sometimes drive shafts require additional alterations to
fit your application needs.
One advantage of the drive shafts mentioned in the introduction is that more complex
machining options are available for our drive shaft selection.
The first alteration I will discuss for drive shafts are threaded ends.
This alteration adds up to three threaded shaft ends including two step
threads
on one end of the shaft. You can also select whether you want a coarse
or fine thread pitch, as denoted on the chart. This table can be found in the
alterationation section
for the drive shafts. Due the typical higher precision required for drive shafts,
Misumi publishes the thread accuracy standard rating to ensure proper
selection.
The tapped end alteration adds a tap to one or both ends of the drive shaft.
The thread will always be coarse for this option. Available threads sizes are noted
in the chart.
Retaining ring grooves can also be added to our lineup of drive shafts.
Just like with rotary shafts, the location of the grooves can be configured in one
millimeter increments, but the width of the groove
is predetermined based on the shaft diameter. Drive shafts have the option to
add up to four flats at any designated part of the shaft,
with the option of having a second flat at the same location in 30 degree
increments.
The flat location and width are configurable in one millimeter
increments.
The features of the keyway on a drive shaft are the same as on a rotary shaft,
except that the drive shaft can allow up to four keyways, whereas rotary shafts can
only have two.
The location and length of the keyway can be configured in one millimeter increments
anywhere along the length of the shaft, but cannot run the entire length of the shaft.
The keyway dimensions follow the same dimensional criteria as rotary shafts.
If a set screw flat is required in conjunction with the keyway, you can use
this alteration to add a set screw flat at the same location as the
corresponding keyway,
but at an angle in 30 degree increments to the keyway.
A set screw flat for all four keyways can be selected.
This alteration adds up to three sets of wrench flats in a position
anywhere on the shaft in one millimeter increments, and follows the same
dimensional criteria
as rotary shafts. Misumi offers on our standard drive shafts
an h6 or h7 tolerance, which is commonly used in slight clearance or
slight push fit.
Typically, a stronger press fit is recommended for direct coupled shafts to
prevent the shaft from slipping during high torque applications.
You can alter your shaft fit with this alteration code. Let's visit Misumi's
website and show an example of a configured shaft.
This is Misumi's globally recognized homepage. Misumi is divided into three
divisions;
Automation Components, Press Die Components, and Plastic Mold Components.
We will be focusing on the Automation Components for this webinar, so I will select
the Automation Components icon.
The Automation Components homepage showcases our major product categories on the left
hand side,
and sub-categories in the pictorial index on the right.
For this session, we are focusing on rotary shafts.
From here you can narrow down your search by either filtering down on the
left hand side,
or scrolling through the descriptions for your exact match.
I will select both sides stepped shapes on the filter column
to narrow down my results. You can click on the enlarge buttons
to see larger pictures of each product or details for a side by side technical
comparison.
For this example, I will select both ends stepped
and tapped. By selecting this option, the site will take me to the part detail
page where can make my final specifications for my shaft.
On the part detail page, also known as a configurator, you'll see the default
drawing view
with blue configurable dimensions. These blue dimensions can be specified in
increments as low as 0.1 millimeters for some dimensions.
I will start by going down the left hand selection column and begin selecting my
desired configuration.
First I will select a g6 tolerance. For material
I will choose a 1045 carbon steel.
As mentioned in the presentation, I must select a surface treatment for the 1045
option.
I will select black oxide.
The diameter of my shaft will be 12 millimeters.
I don't need wrench flats for the shaft, so I will select standard type.
Since I have identified enough of my specifications, the part type will appear
and indicate in red highlights
the remaining dimensions required to complete the part number.
Next I will manually entered the shaft length in the 0.1 millimeter increments.
In this case it will be 147.8 millimeters.
The P dimension is the diameter of the stepped ends on both sides of the shaft.
I will specify 8 millimeters.
For the F dimension, I can reference the drawing to see that it represents the length
of the left
stepped end. I will enter 20 millimeters for this length.
The T dimension represents the right side stepped length and I will enter 15.
My last selection is the M, which is the thread size
for both sides. I will select 6.
If you scroll down you'll find that you can also add alterations the shaft as
mentioned previously.
You can then input the alteration value to add it to your part. For this
example I will not add any alterations. After completing all the selections
you will get a part number that is recognized globally.
You can now click on the Price Check icon to find out the price and delivery
information for this part.
Our standard one piece price for this shaft configuration is $23.40
with no minimum orders,
and can ship in as little as three days. Next we will review some customer submitted
industry examples. In this first example, this wire feeder application is driving
rollers
mounted to rotary shafts. These rollers are being driven by a timing pulley mounted
to another rotary shaft,
and transmitting the motion through the system.
This next example is part of the same wire-guide assembly from the previous
slide.
The shaft driving the wire through is exposed to some force to flatten the wire
being fed.
This is a great example where our drive shaft could be used to withstand the
additional force
and wear in this application. The final application example is a feeder assembly.
Rollers are driven by gears to feed product through the machine.
The drive is transmitting the motion through sprockets mounted on a rotary
shaft.
Thank you, and we hope you enjoyed today's webinar.
All of Misumi'is 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 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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