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 misumiusa.com.
Now I'll turn it over to our Misumi engineer.
Hi, my name is Mike Milligan,
and I'm from the engineering department at Misumi USA.
In this webinar, I'll be giving an overview of
Misumi's Gears. At Misumi,
gears fall under the umbrella of Factory Automation Components.
They are grouped in the Power Transmission section
along with sprockets, pulleys, and conveyors,
since they all help drive rotary systems. Now that you know where gears
are found at Misumi, let's start with a basic question.
What are gears? Gears
are toothed wheels that, when engaged with another gear,
transfer rotary motion from the driving gear
to the gear being driven. Different gear sizes
can change the direction of rotation, torque, and speed of the system.
At Misumi,
we offer five different types of gears; Spur,
Helical, Bevel, Rack,
and Worm. Even though
Misumi has several different types of gears, the pressure angle
is always twenty degrees. The pressure angle
is the angle between the tooth profile and radial line
at the pitch circle. The pitch circle is a circle
through the pitch point centered at the gear axis.
All of Misumi's gears use metric dimensions.
Dimensions like pitch circle and bore size
will always be in millimeters. Misumi's gears
follow the metric gear module system
for gear sizing and compatibility. The gear module
can be found by dividing the pitch diameter, or diameter of the pitch circle,
by the number of teeth the gear has. It is important to make sure
the gears you are using have the same module, otherwise
they will not work together. Two other important gear features to keep in mind
when selecting gears
are backlash and gear ratio. Backlash,
also known as play, is the smallest amount a space between two
non-driving teeth when the driving teeth are in contact.
Backlash is not desirable in applications
where rotation direction is changing.
When the gears change direction, the backlash leads
to an increased force on each tooth that can lead to unwanted
wear and tear.
The gear ratio is also important to consider when choosing the gears
for your system. The larger the ratio between the gears,
the greater the difference in gear speed and torque.
Gear ratio is found by dividing the number of teeth
in the gear being driven by the number of teeth in the driving gear.
In this example, if Gear A was driving the system,
the gear ratio would be 4/7.
If Gear B was driving the system, the gear ratio
would be 7/4.
Now that you have a little bit of background information on gears,
let's run through the gear selection process at Misumi.
In this example, we are going to be building a part number
for a Misumi Spur gear. The first variable to consider when selecting a
spur gear is the gear module.
Misumi has spur gears in all of the modules listed below.
For this example, we're going to choose a module of 2.0.
The second step is determine the type and size
of bore you want. Misumi has options
for a straight bore, a straight bore with set screw taps,
and a keyed bore with set screw taps.
Bore sizes are available in one millimeter increments,
and the size range depends on the number of teeth selected.
It is important to note that the bore tolerance
is H7, and the keyway follows the JIS Standards.
Our example gear is going to need a keyed bore
with tap, and it will have a diameter
of 14 millimeters, which is denoted
as P=14.
The next step is to choose the material.
It is important to note that the materials shown are for our
All Metal spur gears.
We'll get into some alternative materials a little later.
For this example we're going to use 1045 carbon steel
with black oxide coating.
Now that we have our gear module, bore type,
and material, we can start our part number.
Part Type GEAKBB2.0,
denotes all of our previous selections and is the beginning
of our part number. Next, you should choose the number of teeth you want your
gear to have.
Remember, the number of teeth will affect the gear ratio.
Our gear needs to have twenty teeth, which has now been added
in red to our Misumi part number.
After selecting the number of teeth, you need to determine the width
of the teeth shown as the B dimension in blue.
For a module 2.0 spur gear,
the tooth width has to be 20 millimeters,
which has been added to our part number.
Next, we need to specify the gear shape we want.
Misumi has spur gears in three different shapes;
K, A, and B.
The K shape gear is a narrow gear that is ideal for applications
where there is not a lot of vertical space.
The A shape gear is shown in profile and is similar to the B shaped gear.
The only difference between the A shape and the B shape
is that the B shaped gear has a hub for set screws.
We're going to choose the B shape gear for our example,
and we have added it to our part number. The last piece to the part number
is a dimension we have already specified when we chose our bore type.
We specified the diameter to be 14 millimeters.
That bore diameter is specified in the part number
as 14N,
which will give us our completed part number:
GEAKBB2.0-20-20-B-14N.
Now that you have a little bit of background information on gears
and the selection process, we can get into the first type of gears Misumi has
to offer,
the Spur Gear. Two advantages
of the spur gear are they are efficient and easy to assemble.
Spur gears have straight teeth that are easy to align
and there is minimal power lost due to slippage.
Some of the disadvantages of spur gears are they are loud at high
speeds,
must be used in parallel, and they're not as strong as other gears.
The noise at high speeds is due to the backlash
and the instantaneous force the teeth of the gears experience
when they first engage. The force can lead to wear and tear
over time, which can decrease the efficiency of the gears.
Spur gears can only engage properly
if they are used in parallel, due to their straight tooth profile
and location of the bore. In the example on the right,
two spur gears are being used to slide a workpiece
from the right to the left. Misumi spur gears
offer many configurable options, but sometimes more options are needed.
To help with that need, Misumi offers a series of alterations.
The Tapped Holes alteration allows you to change the thread size
of the tapped set screw holes. This alteration is only available for B
shaped gears.
The set screw alteration allows you to add another set screw hole
at either ninety degrees or 120 degrees
from the existing set screw hole.
This allows you yet another point to secure your shaft.
The Both Ends Stepped alteration allows you to have a step on
each side of your bore, and the Stepped Hole
alteration allows you to select the end of the bore
you want the step to come from. The Side Tapped,
Side Through, and Side Slotted Holes alterations
allow you to add the hole type of your choice to the face of the gear.
You can specify either three or four holes at the desired distance
from the center of the gear. Sometimes,
the alterations don't provide enough options to satisfy your design's needs,
which is why Misumi has a "More Configurable" spur gear option.
The more configurable spur gear allows you to configure all the dimensions
depicted in blue. Being able to configure the dimensions of your hub
helps ensure your gear will fit into your application.
Misumi also has spur gears in a variety
other materials and sizes. Misumi has both an
MC Nylon and polyacetal option with a metal sleeve.
Plastic spur gears are useful in lightweight applications
and applications where noise must be kept at a minimum.
The bonded plastic spur gears
offer a carbon steel core with MC Nylon teeth.
Similar to the plastic spur gear,
the bonded plastic spur gear helps keep noise levels down.
The Bearing Built-In gear type
allows you to synchronize the direction of rotation between two opposing gears
as shown in the picture. Another special type of gear
is the keyless spur gear. The keyless spur gear
is available in three different types. The first type
is the E Type. The E Type keyless spur gear
has a similar shape to the A type gear but has a bushing fastened to the
outside of the gear.
The F Type gear has the same shape as the A Type gear,
but with a bushing attached to the inside of the gear's width.
Finally, the G Type keyless spur gear
is similar to our B Type gear since they both have a hub.
The G Type has a bushing attached to the outside of the gear.
Another type of gear
that Misumi manufactures is the Helical Gear. Helical gears
have a diagonal tooth profile which allows them to be quieter
and smoother then spur gears, since the teeth engage more gradually.
Helical gears have the ability to be mounted
in Parallel or Crossed. When the gears are crossed,
you must select Same Handed Gears, Both Right,
or Both Left. Some of the disadvantages
of helical gears are they are less efficient then spur gears
due to tooth slippage. The diagonal profile of the teeth
is what causes the slippage and also leads to axial thrust on the shaft.
It is important to choose a bearing that can withstand the axial thrust generated
by the gears.
Misumi
offers two different types a Bevel Gears; Straight Type
and Spiral Type. The straight type acts similarly to spur gears,
while spiral type is similar to helical gears due to their similar tooth
orientations.
Simply put, straight tooth bevel gears
will suffer from backlash and excessive noise, whereas
the spiral type will be quieter but experience
tooth slippage. Bevel gears
are used for intersecting shafts and have a changeable
operating angle due to their shape. Some of the disadvantages
of bevel gears is they are difficult to assemble due to the changeable
operating angle. The shafts also experience a large force,
so like helical gears, it is important to ensure the bearing can withstand the
force.
Misumi offers bevel gears with a 1:1
or 1:2 gear ratio as depicted.
It is important to note that spiral bevel gears
are only guaranteed to mesh with a gear from the same manufacturer
and they should always be bought in pairs. Another type of gear
Misumi offers is the Rack Gear. Misumi has rack gears
in two different styles; the Flat Type and the Round Type.
The advantages of rack gears
are when paired with a spur gear or pinion,
they can transfer rotary motion into linear motion.
A disadvantage is they cannot run continuously,
since the rack will eventually end.
Worm gears are composed of two pieces,
the Worm Wheel and the Worm Gear.
Worm gears are self-locking and quiet, but suffer from high power loss
and high thrust load on the Worm.
Now that you have seen Misumi's full lineup of gears,
let's look at an application example provided by a customer
as a case study.
This application shows gears of different sizes
turning rollers in a feeder assembly.
As these spur gears turn, the rollers they are connected to
do as well. The spinning rollers propel metal
through the feeder and between the rollers controlled by our second set of
spur gears. Note the idler spur gear,
positioned in the middle of these gears. That idler helps ensure all four gears
are spinning at the same time.
I'm now going to show you how to configure the spur gear we made earlier
on the MISUMI USA website.
Once inside our Automation Components, we know it was our Rotary Power
Transmission component.
From here we can simply click on the gear icon,
and the spur gear icon. We know it had a module
of 2.0.
Once on this page, you're able to configure the rest of the dimensions
on the left hand side. It had a keyway shape,
or it had a hole a hole shape; the bore was
a keyway with a tap; had black oxide coating;
was a Shape B; had a bore diameter
of 14 millimeters, and had 20 teeth.
You're now able to see the completed part number at the top of the page.
If you click the orange Price Check button,
you're able to see the price for Quantity 1,
and the days to ship. 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.
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Full support is also available; technical help at engineering@misumiusa.com,
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