Week 6: Mounting Motors

Overview

In this class we will discuss various techniques of mounting servos, steppers, and DC motors.  As well as cover objects that can be mounted to said motors.

“Motoring what’s your price for flight”
— Night Ranger

DC motor

Show and Tell

We’ll review and discuss last week’s assignment.  What processes/techniques/tools did we use?  Any tips?  What would we change if we could do it all over again?

Tool of the Week

Metal hole punch

The metal hole punch is great for making very clean holes in sheet metal.

Tip of the Week

“Off the shelf is almost always better than custom parts”

Off the shelf parts are almost always cheaper, easier to work with, and just a better idea than custom made parts.

Mounting Motors

We are familiar with operating/controlling servos, DC motors, and steppers; but we may not be too experienced with using them practically or consistently in projects. There are numerous ways to mount motors as well as ways to attach things to motors.  Below are a few off the shelf and DIY solutions.

Servos

Servo

Servos typically have mounting holes, but I find them to be awkward when using them to screw directly into an enclosure or mount.  Store bought mounting options, although pricey, are worth the price for convenience and repeatability.

Servo mount

Vertical Aluminum Mounts

Servo brackets
Aluminum Multi-Purpose Servo Brackets


Aluminum C Servo Bracket

Servo bracket

Servo Plates

DC Motors

DC toy motor

DC motors are cheap and easy to operate, but are tricky to mount into projects.  Typically, you will use a “toy” or “mini” DC motor in your projects.  Below are a few off the shelf options for various sized motors.

DC motor with motor mount
Size 130 Motor Mount

DC motor with plastic motor mount

DC Motor Plastic Mount


Self Adhesive Motor Mounts

Broom Clip

DC motor swivel mount

Motor Mount Swivel Clamp

Metal DC motor mount
Motor Mount – Clamping

Metal DC Motor Mount
Tetrix Max DC Motor Mount

Bent metal DC motor mount
DC Geared Motor Mounting Bracket Holder

TIP: When pulling DC motors from the junk shelf, KEEP THE SCREWS that came with them.  In fact, just leave them screwed into the motor.

Steppers

Stepper motor

Steppers typically have mounting holes in the front near the spindle.  Mounts are pretty straightforward but should be fairly robust to ensure accuracy in your mechanisms.

Bent metal stepper motor mount

Stepper Motor Mount – NEMA-17 Sized

 

Mounting Things to Motors

Not only do you need to know how to mount motors, but also how to mount things to motors.  Below are a few off the shelf solutions.

Shaft Couplers

Set Screw Hubs

Hobby Gearmotors

DC motors with gear boxes

Hobby Motor and Encoder Kit

Geared DC motor, wheels, and encoders kit

TT Motor All Metal Gear Box – 1:90 Gear Ratio

Metal gear TT motor

TT Motor Mount
TT motor mount

Hub for TT Motor
TT motor snap on hub

GM Series Plastic Wheels

Plastic wheels

0.61mm 9-Tooth Pinion Gear

36/12-Tooth Spur Gear

DC Motor Compatible Wheels

Friction fit DC motor wheels

Propeller

Friction fit DC motor propeller

Propeller 3 Blades

Friction fit DC motor propeller

Two Blades

Friction fit DC motor propellers

Computer Fans

Computer fan

Drill Press Drilling Tool

DC motor with drill chuck and drill bits

DC motor with small chuck and drill bit

Mini bead drill press
Mini Drill Press

Servo Horns

These typically come with servos and if you need something fancy they can be found in many places on the internet, the trick is knowing that they are called “horns”.

Various servo horns and screws

Servo Pulley

Sail Arm

Servo Mount Gears

Servo Sprockets

Servo to Shaft Couplers

Servo shaft couplers

Servo Mount Wheels

Servo mount wheels

785 Dual Gear Rack Kit

Gripper Kit

Servo gripper kit

Timing Belt Pulleys

Various timing pulleysVarious timing pulleys

Timing belts and timing pulleys are typically used with stepper motors for precision devices (CNC’s, mechanisms, etc.).  The pulleys can mount directly onto the shaft of a stepper and the teeth of the pulley fit the teeth on the belt.  The trick is to match the tooth pattern of the belt to the tooth pattern of the pulley (like to like).

Timing belt and pulleys

Stepper Motor with 28cm Lead Screw 

Threaded rod stepper motor

Threaded rod stepper motors

Misc.

Motorized slider potentiometer

Motorized Slide Pot

Clock Mechanisms

DIY Solutions

Screw terminal blocks are a cheap electrical component that can be found at most hardware stores.  It is filled with little metal couplers that work great for connecting motor shafts to axles and rods.  The trick is getting the metal parts removed from the plastic.

Screw terminal blocks

Small shaft coupler

DC motor, shaft coupler, and flag

Self Adhesive Cable Tie Mounts and Zip Ties

Laser Cut Panels and Standoff DC Motor Mounts

Sandwiching DC motors between to laser cut panels using standoffs is a quick and reliable method.

Laser cut acrylic and standoffs DC motor mount

Illustrator File for DC Motor Mount

Illustrator File for Toy Motor Mount

Laser Cut Stepper Mounts

Using the laser cutter and acrylic bender you can make quick and dirty stepper motor mounts.  I do not recommend these mounts for precision devices.

Laser cut acrylic stepper motor mountLaser cut acrylic stepper motor mount

Illustrator File for Stepper Motor Mount

Laser Cut Adjustable Tension Stepper Mounts

Using two laser cut parts (one stepper mount, one base) and some fasteners, you can create a mount that allows you to add tension by changing the position of the stepper.  Perfect for timing belts.

Laser cut stepper motor mount assemblyLaser cut stepper motor mount assembly

Files

Full Motor Assemblies

You can even buy full motor/gear box/axle/wheel assemblies.

Tamiya Tracked Vehicle Chassis Kit

Tamiya 70168 Double Gearbox L/R Independ 4-Speed

 Tamiya 4WD Chassis Kit

Mounted Motor Projects

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In Class Demo

We will go over the sander, grinder, and bend.

Assignment

For the last assignment you will be mounting a motor/servo/stepper (one or more) to something as well as mounting something to that motor/servo/stepper.  It can be completely DIY, or off-the-shelf components, or a combination of the two.

Everyone will present their project in class.

Post your progress and project to your blog.


Related Reading/Viewing

Di-Dah-Dit (enclosure, mounted servos, mechanisms, laser cut parts, the works)

361 Zimoun

Sheet Metal Box & Pan Brake Tutorial

PaperFoxTrot Satelites

Rhea