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

 

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

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

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.

Vertical Aluminum Mounts


Aluminum Multi-Purpose Servo Brackets


Aluminum C Servo Bracket

 

Servo Plates

 

DC Motors

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.

 


Size 130 Motor Mount

DC Motor Bracket for 130 size motors

 

DC Motor Plastic Mount

 


Self Adhesive Motor Mounts

Broom Clip

Motor Mount Swivel Clamp


Motor Mount – Clamping


Tetrix Max DC Motor Mount


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

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.

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

 

Gear Boxes

 

Hobby Gearmotors

 

Hobby Motor and Encoder Kit

 

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

 

GM Series Plastic Wheels

 

0.61mm 9-Tooth Pinion Gear

36/12-Tooth Spur Gear

DC Motor Compatible Wheels

40x7mm Wheels

 

Propeller

Propeller 3 Blades

 

Two Blades

Computer Fans

 

Drill Press Drilling Tool (this one too)


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”.

 

Servo Pulley

 

Sail Arm

 

Servo Mount Gears

 

Servo Sprockets

 

Servo Shafts

Servo to Shaft Couplers

 

Servo Mount Wheels

 

785 Dual Gear Rack Kit

 

Gripper Kit

 

 

Timing Belt 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.

 

Stepper Motor with 28cm Lead Screw 

 

Misc.

Motorized Slide Pot

 

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.

 

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.

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.

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.

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

A post shared by Nik Ramage (@nikramage) on

A post shared by Martin Smith (@smithautomata) on

A post shared by Martin Smith (@smithautomata) on

A post shared by Ben Light (@blight_design) on

 

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