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Motor mounts


Radial load track rollers Also known as cam followers, track rollers guide linear motion in a variety of machine tool and material handling applications. – PowerPoint PPT presentation

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Title: Motor mounts

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Motor mount from McMaster Carr
Gearboxes and motors from the Team Nightmare
Material Selection
  • Light
  • Strong
  • Easy to fabricate
  • Easy to integrate

Polycarbonate Sheets
Polycarbonate is a very tough thermoplastic
material used in police riot shields, bulletproof
windows, as armor and even structural material in
combat robots. Polycarbonate plastic may also be
found as the walls of the BattleBots arena
(Lexan), as well as the high-strength walls of
other robot arenas around the world. Polycarbonate
used in robots have many advantages 1. It is
very lightweight compared to other material
choices. About five to six times less dense than
steel! 2. It is quite durable and has a tendancy
to spring back into position when bent. It will
not form to a bend as many metals will. 3. It is
see-thru, making it a great choice for robot
armor where you need to be able to see into the
robot. 4. It does not conduct electricity and
makes a great insulator for electrical systems.
5. Polycarbonate plastic is easy to work with.
Cutting, drilling and even machining and tapping
it is a breeze. You can find Polycarbonate
plastic on many of the top robots in the sport of
robotic combat.
"Composite" is a general term which means an
assembly of dissimilar materials used together.
They are carefully engineered and are uniquely
suited to be extremely strong and surprisingly
light weight. These materials consist of a resin
matrix and a fiber reinforcement. As a result,
Carbon Fiber is a fantastic material to use for
robot armor, interior component mounting, and any
situation where you want rigidity but do not want
to add much weight. Carbon fiber is even lighter
than Polycarbonate Plastic
80/20 Extrusions
Limit different sizes and types of threads of
nuts and bolts
Limit the different styles of head you select
Limit the different styles of drives you use
McMaster Carr has a large selection of spacers
and standoffs
Attaching Wheels etc.
  • As the wheels get bigger your robot
  • Moves faster
  • May have more friction, therefore drawing more
  • Will need more initial power to begin to make it

Wheels from Team Nightmare site
Multi-Purpose Hubs
This is a great solution to hold various
high-stress items that you'd like to spin, such
as a sawblade. Depending on your particular
application, this may also work quite nicely as a
drive wheel hub. It is made especially for
Robotic Combat standards of high quality,
lightweight 6061 Aluminum on one of the finest of
commercial lathes by some of the best makers in
the USA. We chose 6061 Aluminum as the ideal
material for this task at a reasonable price. It
is much stronger than many of the other aluminum
hubs you will find, with many times the shatter
resistance of any kind of plastic hub. This hub
comes with 6 black, 3/8" long, 1/4"-20 hex-socket
head bolts to attach through the sawblade (or
wheel) face and into the hub itself, so nuts
should not be necessary.  
Colson Bore Reducers from Team Nightmare site
So you want to use one of the big Colson wheels
with the large bore, but you don't want to use a
monster shaft. This is what you need to reduce
the large bore down to something more manageable.
These are custom built 6061 Aluminum bore
reducers that were made to fit the Colson
Performa wheels. These reducers are made
especially for Robotic Combat standards.
Coupler from McMaster Carr
Couplers from McMaster Carr
Couplings connect two shafts and transfer motion
from one shaft to another. They attach via cap
screws, set screws, a combination of keyways and
set screws, or bushings.
     ANSI Keyways- Couplings with keyways give
you a more secure hold and are especially good
for alternating-motion applications. Keyways
follow standard ANSI dimensions listed in the
chart at right.
     Torque Ratings- Couplings are rated by the
maximum torque they can carry, and sometimes by a
limiting or maximum rpm. Maximum torque can be
used to determine horsepower (or vice versa) by
the following formula
Pinhole Disk Couplers from McMaster Carr
   Also known as Schmidt couplings, these
couplings handle three times more angular
misalignment than the slotted-disc couplings
above. Great for use with encoders, they allow
zero backlash (they will not slip) and never need
lubrication. For a complete coupling, you need to
order two hubs and one disc from the same line in
the listing below (for example, two  60635K1 
hubs are designed to work with one  60635K86 
disc).      Hubs are aluminum and have an
internal clamp-style collar with socket-head cap
screw for a strong, nonmarring grip. Bore sizes
smaller than  1/2" do not have keyways  1/2" and
larger have ANSI keyways. To Order  Please
specify bore size from those available below.
Note You can use two hubs with different bore
sizes in one coupling as long as the hub ODs are
the same.      Discs are Delrin. Temp. range is
-30 to 150 F.
Acetal Helical Beam Couplings
     Three beams, or cuts, in these lightweight,
corrosion resistant couplings provide flexibility
for parallel and angular misalignment. Excellent
for motion-control applications that require
precise positioning for frequent starts and
stops, they allow zero backlash (they will not
slip) and never need lubrication. Couplings
connect to shafts via integral shaft collars-no
marring as with set-screw mounted couplings. Two
socket-head cap screws are included. To Order 
Where applicable, please specify bore size (A)
and bore size (B) from those available below.For
more information about couplings, see page 1029 .
Note You can choose any available bore size (A)
and any available bore size (B) for a given hub
About Gears
In order to mesh, gears must have the same pitch
(ratio of number of teeth to pitch dia.) and
pressure angle (angle between contact points of
meshing teeth). Pitch dia. is the dia. of the
circle formed at the contact point of meshing
teeth. Gears with 14 1/2 pressure angle are the
original AGMA (American Gear Manufacturers'
Association) standard. They provide smooth, quiet
meshing and are good for replacements in existing
designs. Gears with 20 pressure angle are the
most recent AGMA standard, with stronger teeth
and higher load capacities. If you need a gauge
to help determine gear pitch and pressure angle,
see 2069A on page 2048 .      There are three
types of gear pitch Coarse (up to 20 pitch) for
heavy duty power transmission medium (20 to 64
pitch) for general purpose power transmission
and fine (more than 64 pitch) for light duty
power transmission and instrumentation
Helical gears
Left hand helical
Bevel gears
Right hand helical
Teeth are set at a 45 helix angle which, in
parallel shaft applications, gives you more
constant tooth contact for smoother, quieter
operation and the ability to handle higher
horsepower than comparable-size spur gears.
Hubless design allows use in tight spots.
Parallel-shaft applications require one right-
and one left-hand gear. These gears can also be
used with shafts at 90 angles however, they are
50 less efficient due to reduced tooth contact
area. Use gears with the same hand (two
right-hand gears or two left-hand gears). All
have a finished bore with keyway unless noted.
To Order  Please specify right- or left-hand
helix angle.
Timing belt gears
Worm Gears Worm gears and worms produce a high
speed-reduction ratio in a minimal amount of
space. They're designed for use on shafts that
intersect at a 90 angle.      Worm gears are
cast iron and have a plain bore (no set screws or
keyway). Worms are steel and have a keyway and
right-hand thread.     Note Speed-reduction
ratio is determined by number of teeth. For
example, a 20-tooth worm gear and its mating worm
will give you a 201 ratio a 30-tooth worm gear
and its mating worm will give you a 301 ratio.
Hubless spur gears Also called change gears,
these gears feature a space-saving hubless design
that makes it easier to mount two or more gears
side-by-side. Gears have a finished bore with two
keyways spaced 180 apart. You can attach gears
to your shaft with a bushing, sold separately
below. Bushings are steel, can be press-fit, and
have two integral keys that match the hubless
gear's keyways.
In order for sprocket and chain to properly mesh,
select a sprocket that matches your specific
chain number and pitch. Pitch is the distance
from one tooth valley to the next this is where
the centers of chain pins mesh with the sprocket.
Finished Bore Steel Sprockets Bores are finished
so these sprockets are ready to mount. They have
a standard keyway, except  3/8" and  1/2" bore
sizes. Keyways are on the centerline of tooth.
All include two set screws. Use sprockets with
ANSI single-strand chain. Made of steel.
To Order  Please specify bore size. Standard
bore sizes are  3/8",  1/2",  5/8",  3/4" ,
 7/8", 1", 1 1/8", 1 3/16", 1 1/4", 1 3/8",
1 7/16" 1 1/2", 1 5/8", 1 3/4", 1 15/16", 2",
2 3/16", 2 7/16", and 2 15/16".
Plain Bore Sprocket
Sprocket accessories
 Just like the plain bore sprockets, except these
don't have a hub which makes them excellent for
use in confined spaces. Sprockets do not include
keyways or set screws. Use with ANSI
single-strand chain. Minimum bore size is the
furnished size you can enlarge bore to the
maximum bore size.
Double strand plain bore sprocket
Hubless plain bore sprocket
Roller chain lubricator
Double drive plain bore sprocket
Roller chain idler sprockets
The bearings or bushings in these sprockets allow
them to rotate freely while controlling chain
slack to maintain proper tension and prevent
whip. Steel sprockets have precision-cut teeth
for longer chain life. Teeth on steel sprockets
with plain bronze bearings and with needle
bearings are also hardened to reduce sprocket
wear. Steel sprockets with plain bronze bearings
also have two plain washers and a hardened steel
sleeve to protect the bearings. UHMW
polyethylene sprockets are self-lubricating,
flexible, and resistant to abrasion and
impact. Bearing/Bushing Sprockets Ball bearings
are double-sealed and lubricated bronze
bearings/bushings are oil-impregnated needle
bearings have retainers separating the needle
rollers to minimize internal friction and wear.
Chain links
Roller chain consists of alternating pin links
(two pins supported by side plates) and roller
links (two rollers on bushings, also supported by
side plates). The pins (all of which are riveted,
except where noted) pivot inside the bushings.
The rollers are free-turning to provide rolling
contact with sprocket teeth. Chain sizes are
distinguished by pitch, the distance between pin
centers. Some smaller-pitched roller chain is
actually rollerless, and is constructed of pins
and bushings only. Use roller chain and sprockets
with the same ANSI No.
Roller single link
Offset single link
Connecting link
Connecting Link- A special pin link that's easily
disassembled use to join the ends of a length of
chain to make a continuous strand and to splice
lengths together. Roller Link- Add to chain to
lengthen it. Note Roller links for multistrand
chain are single links placed side-by-side.Offset
Link- A combination of a pin link and roller
link. Standard chain has an even number of
pitches use an offset link to make a strand with
an odd number of pitches.
Chain tools
Use one tool to break and rivet roller chain.
This tool can break ANSI 50 ( 3/8"- 5/8" pitch)
and 60 ( 1/2"- 3/4" pitch) roller chain. Rivets
40-60. You can bolt it to a workbench (using
two  3/8"-24 bolts, not included), support it in
a vise, or use it by hand (with included
removable handle). Also includes rivet set, rivet
anvil, and press plate. All attachments are made
of 86L20 steel and are heat treated for strength
and durability.
 Chain holders work like a third hand to help you
insert and fasten connecting links. Just hook the
jaws into each end of your chain and turn the
handle on top (a knurled screw knob on Style A
and a T-handle on Style B) until chain ends
almost meet. Insert the connecting link and
fasten. Made of carbon steel.
Alligator Conveyor Belt Lacing

Roller chain tensioner
These tensioners ride on chain, compressing it
axially to control tension. They don't need to be
mounted to a structure. They require no tools,
lubrication, idler sprockets, or bearings. Saddle
blocks ride on chain midway between the drive
sprocket and driven sprocket and are joined by
adjustable straps which take up the slack.
Tensioners are made of UHMW polyethylene (FDA and
USDA compliant for food contact) with stainless
steel housing and zinc-plated steel screws and
wing nuts. Max. temp. is 200 F. Tension force
not rated.
Ball Bearings
Steel semi precision ball bearings
The unground inner raceways in these bearings
give you good performance at moderate speeds and
loads. Inner and outer sleeves are hardened
carbon steel. Temperature range is -20 to 250
F.     Standard Bearings- Tolerance for open
bearings .005" to -0" for shaft dia., 0" to
-.005" for OD, and .010" for width. For double-
shielded and double-sealed bearings .005" to
-0" for shaft dia., 0" to -.0005" for OD, and
.005" for width.     Flanged Bearings- Allow
precise positioning during installation, so you
don't need snap rings or to counterbore the
housing. Tolerance .005" to -0" for shaft dia.
.005" to -0" for OD, and .010" for width on
open bearings .005" for width on
Radial load track rollers
 Also known as cam followers, track rollers guide
linear motion in a variety of machine tool and
material handling applications. In addition, they
resist shock loads.     Radial-Load Track
Rollers- Support loads perpendicular to their
axis of rotation. They usually contain needle
roller bearings, cylindrical roller bearings, or
sleeve bearings. Needle roller bearings offer
higher load carrying capacity than sleeve
bearings. Cylindrical roller bearings also offer
high load carrying capacity, as well as the
ability to run at higher speeds without forcing
the roller out of alignment. Sleeve bearings have
no rolling element-loads are supported through
sliding motion between two low-friction surfaces.
Sleeve bearings are designed for light loads and
low speeds. Some radial-load rollers have a
hex-socket head or a slotted head for ease of