AndyMark AM14U5 User manual

User Guide
AM14U5 Chassis Base Kit for the
FIRST® Robotics Competition
November 2021

2
AndyMark – Your Robot Parts Experts
AndyMark, Inc. was founded in 2004 by Andy Baker and Mark Koors to design and sell unique mechanical parts for
competition and educational robotics. Through their volunteer work at FIRST® Robotics Competition events they
identified a niche market and began designing and selling robotics components for FIRST ® teams. At that time, many
designs were being shared and re-created, but finding the correct fabrication resources for these parts was difficult for
some FRC teams. AndyMark has been a proud supplier to the FIRST® Robotics Competition since 2005.
AndyMark's staff has over 200 years of FIRST team experience, and provides staffing services to many robot
competition events throughout the year. Our Kokomo, Indiana home provides a central location for quick distribution
across North America, as well as international shipping to over 70 countries.
Additional Instructions Available
We encourage customers to seek product information at AndyMark.com, contact us via e-mail at
[e-mail], or call Toll-Free 877-868-4770 with questions about any of our products.
Detailed assembly tips and instructional videos can be found at AndyMark.com/FRCVideos.Additional resources,
layout prints, and CAD are available on the AndyMark.com/KOP web page.
AM14U5 Recommended Hand Tool List (not included)
Component
Part Number
QTY
Part Photo
Hammer
Available at your
local hardware store.
1
Cordless Drill or Driver
Available at your
local hardware store.
1
3/8" Magnetic Nut Setter
am-2755
1
1/4" Magnetic Nut Setter
am-4607
1
9/16" Socket, 3/8" Drive
am-2743
1
3/8" Socket, 3/8" Drive
am-2740
1
5/32" Ball End Hex Bit Driver
am-2751
1
3/8" Drive Quick Release Ratchet
am-2753
1
1/2" - 9/16" Open-End Wrench
am-2746
1

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AM14U5 System Overview
The AM14U5 system designed by AndyMark engineers is a fully customizable drive platform for the FIRST® Robotics
Competition. The Kit of Parts Drive Chassis is a 6-Wheel Drive (6WD) AM14U5 configuration engineered to withstand
the rigors of this year’s game challenge. The AM14U5 Drive Chassis Kit includes standard AndyMark products and is
designed to be compatible with other AndyMark products. There are many ways to use the parts included in this kit.
•Utilize these step by step instructions to quickly build the standard drive chassis.
•Take advantage of convenient built-in features to convert to another pre-engineered drive solution.
•Take the existing parts and pieces included and re-design them in a new way
Gearbox Overview
Each AM14U5 Chassis Base Kit includes two (2) AndyMark Toughbox Mini Gearboxes, unassembled (am-2598). Each
Toughbox Mini includes the parts needed to mount two 2.5” CIM motors (am-0255) or NEO Brushless Motors (am-
4258). The gearbox also includes holes for optional encoders such as the USDigital E4T Optical Encoder (am-3132) or
REV Thru Bore Hex Encoder (am-4650) on both the inside and outside of the chassis.
]
Gear Ratio Specifications:
To change the drive speed of the AM14U5, different gear ratios can be used in the Toughbox Mini. To change the ratio
and drive speed, the standard 16 tooth Small Cluster Gear and 48 tooth Large Output Gear will need to be replaced
with two gears totaling 64 teeth. The higher the ratio, the slower the output speed.
More information about these optional gears can be found at "AndyMark.com/TBmini".
**AM14U5 speed estimation is based on calculations using 6” wheels, and one CIM motor per TB Mini running at 4100 rpm, or 75% of free speed.
Ratio
8mm Gear
Lg. Cluster
Sm. Cluster
Lg. Output
AM14U5Speed**
5.95:1
14T
(am-0034)
50T
(am-0149)
24T
(am-0177)
40T
(am-0178)
18.0 ft/sec
7.31:1
14T
(am-0034)
50T
(am-0149)
21T
(am-2564)
43T
(am-2565)
14.7 ft/sec
8.45:1
14T
(am-0034)
50T
(am-0149)
19T
(am-0176)
45T
(am-0179)
12.7 ft/sec
10.71:1
(included)
14T
(am-0034)
50T
(am-0149)
16T
(am-0747)
48T
(am-0885)
10.0 ft/sec
12.75:1
14T
(am-0034)
50T
(am-0149)
14T
(am-0151)
50T
(am-0150)
8.4 ft/sec
Toughbox Mini Gearbox
∙ Gear Profile: 20 DP, 14.5° pressure
angle
∙ Gear Material: Cold-formed 4140
Steel
∙ Output Shaft: 1/2” Hex, 4140 Steel
∙ Housing Material: Nylon 6/6 with
long fiber reinforcements
INCLUDED
EVO Shifter 2-Speed
OPTIONAL
EVO Slim Single Speed
Toughbox Micro
For use with Mecanum

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Powertrain Specifications
The AM14U5 Kit of Parts Chassis Base Kit includes Gates HTD belts and the parts needed to build a 6” 6-wheel drive
chassis with a direct drive center wheel in three recommended frame sizes. Other belt sizes are available on
AndyMark.com or through Gates to allow for many more configurations.
Additionally, the AM14U5 parts can be used in other popular drive configurations as well. Sprocket & Chain, Direct
Drive Mecanum Wheels, and 8WD can all be built by using the frame in this kit and swapping out some of the parts.
For details on how to change your drive system visit AndyMark.com/AM14u5
Wheel Overview
Included in the Drive Base Kit are 6” 80A HiGrip Wheels. These wheels are made of high-strength polycarbonate with
an 80A urethane tread. These wheels provide long-lasting grip throughout the competition season. Many other
wheels can be used as an alternative with minor adjustments to the plate spacing and layout.
6” HiGrip Wheels
am-0940b
INCLUDED INCLUDED
120, 131, and 160 Tooth Gates Belts for 3 recommended sizes
OPTIONAL
Mecanum Drive
8-Wheel Drive
OPTIONAL
DuraOmni Wheels
am-3154
Performance Wheels
am-0095b
SmoothGrip Wheels
am-0144a
Plus many other 4”,
6”, and 8” options.
For full information
please visit
AndyMark.com

5
Wheel and Belt Assembly Bill of Materials
Component
Part Number
Quantity
Part Photo
6" HiGrip Wheel
am-0940b
6
½” Hex Hub
am-4124
2
Gates HTD 15mm wide,
160 Tooth Belt for Long
Chassis
am-2266
4
Gates HTD 15mm wide,
120 Tooth Belt for Wide
Chassis
am-2704
4
Gates HTD 15mm wide,
131 Tooth Belt for Square
Chassis
am-2571
4
Pulley Half, 42 Tooth
am-2234a-half
16
Wheel Screw Kit –(am-14U5_CK7)
10-12 x 1.25” Thread
Forming Screws
am-1592
48
Bearing Kit –(am-14U5_CK8)
1614ZZ Bearing
am-0209
8
FR8ZZ Bearing
am-0030
2

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Toughbox Mini Bill of Materials – Build two per Chassis
Component
Part Number
Quantity
Part Photo
TB Mini Housing
am-0650
1
½” Hex Output Shaft
Encoder Pin Ready
am-2566b
1
TB Mini Small Hex Shaft
am-0152
1
TB Mini Kit 1– am-14U5_TM1
50 Tooth, 3/8” Hex Gear
am-0149
1
14 Tooth, 8mm CIM Gear
am-0034
2
16 Tooth, 3/8” Hex Gear
am-0747
1
48 Tooth, 1/2” Hex Gear
am-0885
1
¼”Dowel Pin
am-1323
2
TB Mini Kit 2 – am-14U5_TM2
R6ZZ Bearing
am-0516
2
FR6ZZ Bearing
am-0028
1
FR8ZZ HexHD Bearing
am-2986
1
Red Tacky Grease Pack
am-2768
1
TB Mini Kit 3 –am-14U5_TM3
2x2x10mm Machine Key
am-1121
2
5/16" Washer
am-1009a
4
8mm Retaining Clip
am-0033
2

7
10-32 x 0.625” SHCS with
Nylon Thread Lock Patch
am-1120
4
10-32 x 0.75” SHCS
am-1047
4
10-32 Nylock Nut
am-1042
4
1/2" E-Clip Ring
am-0206
1
AM14U5 Chassis Frame Bill of Materials
Component
Part Number
QTY
Part Photo
AM14U Family End Plate
am-3920
2
AM14U5 Outer Plate
am-3921a
2
AM14U5 Inner Plate
am-3922a
2
500 Churro, 24.25"
am-2974
2
AM14U5 – Churro Screw Kit – am-14U5_CK1
1/4-20 x 0.75” Thread
Rolling Screw
am-1591 or am-
1310
20
AM14U5 – Axle Kit – am-14U5_CK2
3/8-16 x 4.25” HHS Bolt
am-1297
4
3/8-16 Nylock Nut
am-1054
4
AM14U5 – Spacer Kit – am-14U5_CK3
0.570" Hex Spacer
am-1305
2
Plastic Spacer 0.280"
am-1306
4
Plastic Spacer 0.850"
am-1307
4
AM14U5 – Frame Hardware Kit – am-14U5_CK4
10-32 x 0.5” SHCS
am-1002
24
10-32 Nylock Nut
am-1042
24
AM14U5 Churro Kit – am-14U5_CK5
500 Churro, 3.375"
am-2569
8

8
Frame Diagrams & Cut Lines:
The AM14U5 is designed for multiple configurations. Chassis pieces should be measured and cut down to size; some
possible configurations are shown below. Ensure that your final frame size complies with all current rules. Belts for
recommended LONG, SQUARE and WIDE configurations are included in the full AM14U5 Kit.

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6” HiGrip Wheel and Pulley Assembly Instructions
Outer Wheels (QTY 4)
Step 3: Press two 1614ZZ bearings
(am-0209) into the wheel/pulley,
one into each side.
4X
Center Wheels (QTY 2)
Step 2:Using six 10-12 x 1.25” (am-1592) thread
forming screws attach the pulley halves to the wheel.
Step 4:
Add two more pulley halves (am-2234a-half)
to the wheel.
Step 3:Flip wheel over.
Step 5: Insert one ½” Hex Hub (am-4124) into the
pulley on one side of the wheel.
Step 6:Add six 10-12 x 1.25” (am-1592) thread forming
screws to attach the pulley and hub to the wheel.
Step 1:Add two pulley halves (am-2234a-half)
to the wheel (am-0940b).
2X
NOTE: Tighten the
screws in a star
pattern to ensure the
pulley aligns evenly
on the wheel.
Step 1:
Add two pulley halves (am-
2234a-half) to the wheel (am-0940b).
Step 2:
Using six 10-12 x 1.25” (am-
1592) thread forming screws, attach
the pulley halves to the wheel.
NOTE: Tighten the screws in a star pattern to ensure the pulley aligns evenly on the wheel.

10
Toughbox Mini Assembly Instructions – Build 2 gearboxes
Step 1: Press two R6ZZ bearings (am-0516) into the two
center holes of the TB Mini Housing (am-0650). Ensure they
are fully seated and inserted all the way into the housing.
Step 2: Insert the TB Small Hex Shaft (am-0152) into
R6ZZ bearing closest to the flat edge of the housing.
Step 6:Insert the end closest to the E Clip of the TB
Hex Output Shaft into the other R6ZZ bearing.
Step 5:Tap the 1/2” E-Clip (am-0206) onto the groove
on the TB Hex Output Shaft.
Step 7:Place the 48 Tooth Gear (am-0885) on TB Hex
Output Shaft with the flat side touching the 1/2” E-Clip.
Step 8:
Apply Red Tacky Grease (am-2768) to all of
the gear teeth.
Step 3: Place the 50 tooth gear (am-0149) on the TB
Small Hex Shaft with the small round boss touching
the bearing and the flat side of the gear facing away
from the housing.
Step 4
: Place the 16 tooth gear (am-0747) on the TB
Small Hex Shaft with flat side touching the 50
tooth gear.
Optional Encoder Pin Install:
Thoroughly clean off any oil on the encoder pins.
Using super glue, add an encoder pin to either end of the encoder shaft. Let the
glue dry. For more information on choosing encoders and pin locations please
visit AndyMark.com/TBMini

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Step 2: Attach the top flange of an Inside Plate to the
top (large) flange of an End Plate (am-3920) at the 8th
hole in from the end with two 10-32 x 0.500 socket
head screws (am-1002) and two 10-32 Nylock nuts (am-
1042).
Step 4: Repeat steps 2-3 on to attach the other Inside
Plate to the End Plate.
Chassis Assembly Instructions
Step 1:
Press a FR6ZZ (am-0028) and a FR8ZZ-
HexHD (am-2986) bearing into the center holes on
each Inside Plate (am-3922a). Make sure the
bearing flanges are on the same side as the
bottom flange of the Inside Plate.
Step 3:
Secure the bottom flange to the End Plate with
an additional 10-32 x 0.500 socket head screw and
10-32 Nylock nut.
NOTE: The top flange of the Inside Plate should
point toward the short side of the End Plate
NOTE: The top flange of the Inside Plate should
point toward the short side of the End Plate
Bottom Flange
Top Flange

12
Step 6: Attach the two (cut to length) Long Churros
between the Inside Plates using four ¼-20 x 0.750”
thread forming screws (am-1591). A ½” wrench can be
used to hold the churro while tightening.
NOTE: Be careful not to overtighten these screws.
The gears should spin freely when the shaft is
rotated by hand.
Step 8: Attach one Toughbox Mini to each Inside Plate
with four 10-32 x 0.75”SHCS (am-1047) and four 10-32
Nylock nuts (am-1042). The nuts will fit into the hex
pockets on the Toughbox Mini housing and will hold the
nut while tightening.
Step 7: Place one Toughbox Mini onto each Inner
Plate ensuring the shafts are inserted into the
flanged side of the bearings, and using the plastic
studs to align the housing. The top flange of the
Inside Plate will be facing away from the gearbox.
Step 5: Attach the other End Plate to the other end
of the Inside Plates.

13
Step 13: Select the appropriate belts for your chassis configuration, and loop one belt over each Pulley on each
Center Wheel Assembly.
Step 9: Slide two 5/16” washers (am-1009a) onto each
CIM motor shaft against the round boss of the motor.
Place the Machine Key (am-1121) into the keyway of the
motor shaft. Slide the 14 tooth (am-0034) gear onto the
shaft up to the washers, while aligning the keyway of the
gear to the key. Use a 7/16” socket to press the 8mm
Retaining Clip (am-0033) onto the face of the gear, with
the tabs of the clip pointing toward the motor shaft.
Step 10:
Line up the CIM motors with the mounting
holes in each Toughbox Mini. Secure each motor with
gears installed to the Toughbox Mini housing using
two 10-32 x 0.625” SHCS w/ Nylon Patch (am-1120).
The long chassis requires 160
tooth belts (am-2266).
The wide chassis requires 120
tooth belts (am-2704).
The square chassis requires
131 tooth belts (am-2571).
Step 12:Place the Hex Spacer (am-1305) onto each
Toughbox Mini Hex Output Shaft and press into the round
cavity in the pulley. The shaft will help align the spacer
hex bore with the wheel hub hex bore.
Step 11:Place a Center Wheel Assembly onto each
Toughbox Hex Output Shaft with the aluminum
hub facing towards the Inside Plate.
NOTE: Each drive gearbox can accept up to 2
motors. Repeat this step for each motor.

14
NOTE: The Churro Standoffs are intended to help with the structure of the chassis.
Be sure to install four on each Inner Plate.
Step 14: Press the FR8ZZ Bearing (am-0030) into the
center hole of each Outside Plate (am-3921). The
bearing flange will be on the side opposite the plate
flanges to ensure the bearings do not fall out during
operation.
Step 15:Place each Outside Plate into the ends of
both End Plates with the flanges of the Outside Plate
pointing away from the Inside Plate. Ensure the
Bearing is aligned to and installed on the Toughbox
Mini Hex Output Shaft.
Step 16: Secure the Outside Plates to each End Plate
using six 10-32 x 0.500 socket head screws (am-1002)
and two 10-32 Nylock nuts (am-1042).
Step 17:Attach four 3.375” Churro Standoffs (am-2569)
(see below for recommended locations) with 1/4-20 x
0.75” Thread Forming Screws (am-1591) onto each
Inside Plate. A 1/2” wrench can be used to hold the
churro while tightening. Make sure to loop belts over
the churro to ensure the belts have a straight path from
axle to axle.
Recommended Support Churro Locations

15
Step 19:There are different axle bolt locations for each chassis configuration. Locate the hole to match the chosen
belt and frame size.
Hole Diagram for 6” Wheels
NOTE: The belts should be parallel to the side plates.
Step 18: Secure the Outside Plates to each Churro Standoff using 1/4-20 x 0.75” thread forming screws (am-1591).
A 1/2” wrench can be used to hold the Churro Standoffs while tightening.
NOTE: Axle bolts must be installed from the outside of the chassis. If they are inserted into the Inside Plate first,
the included bumper hardware will not fit.
Step 21:
For the pulleys that are closest to the
Outside Plate, the Short Axle Spacer (am-1306) will be
closest to the outside plate. The Long Axle Spacer
(am-1307) will be closest to the inside plate.
Step 20:
Take an Outer Wheel Assembly, loop the belt
onto the pulley, and insert the wheel between the
Inside and Outside Plates. Ensure the belts are
straight. One end will have the pulley closer to the
outside plate, the other closest to the inside plate.
BOTTOM VIEW
BOTTOM VIEW

16
Step 23:
Add another Outer Wheel Assembly to the
other end of the chassis. Loop the belt onto the pulley
and insert the assembly between the Inside and
Outside Plates. This assembly should have its pulley
facing opposite of the first assembly.
Step 24: For the belt runs that are closest to the
Inside Plate, the Short Axle Spacer (am-1306) will be
closest to the Inside Plate. The Long Axle Spacer (am-
1307) will be closest to the Outside Plate.
Step 25: Slide a ⅜” axle bolt (am-1297) through the
spacers and wheel assembly, with the head of the bolt
on the outside of the chassis.
Step 22: There are different axle bolt locations for
each chassis configuration. Slide a ⅜” axle bolt (am-
1297) through the spacers and wheel assembly, with
the head of the bolt on the outside of the chassis.
Step 26: Install one ⅜-16 Nylock Nut (am-1054) on
each Axle Bolt. Tighten the bolt and nut until the
spacers just begin to touch Inside and Outside Plates.
The wheels should still easily turn, and the axle bolts
should be able to spin with a light turn of a wrench.
Step 27: Repeat steps 19 through 26 to install
wheels on other side of chassis.
BOTTOM VIEW
BOTTOM VIEW
BOTTOM VIEW
BOTTOM VIEW
You’ve completed the AM14U5 Kit of Parts Chassis.
For more information, tips and instructions on how to mount your battery, bumpers, encoders and
more visit AndyMark.com.
NOTE: An optional Axle Nut Holder (am-4595) can be used to hold the axle nut for easier wheel maintenance.