AppSizer on iTunes

Applied Mechatronics’ AppSizer tool is designed for sizing servo, stepper, AC, or DC motors into a motion control application. It’s an easy to use app for calculating motor torque and velocity requirements, system inertia , and motion system performance for the most common mechatronic positioning systems: rotary loads, screw driven devices, and rack & pinion and belt & pulley mechanisms.

AppSizer features individual pages for sizing the most common motion control applications. Each application page allows you to enter drivetrain and move profile details, such as move distance and time, mechanical reduction and efficiency, and other system details. It will then provide you with the motor performance requirements for triangular and trapezoidal move profiles, and can calculate the load to motor inertia mismatch, which is key to a properly sized motion system.

The AppSizer includes the following pages:
•Calculators – tools for converting rotary motion to linear velocity, rotary torque to linear thrust, and horsepower, inertia and torque calculators.
•Rotary Load Mechanism Motor Sizer
•Screw Drive Mechanism Motor Sizer
•Rack & Pinion Mechanism Motor Sizer
•Belt & Pulley Mechanism Motor Sizer

AppSizer employs widely accepted kinematic engineering formulae that we’ve used in our 30 years of sizing and applying motion systems, now with the added convenience of being able to perform them on your mobile device anywhere.

You can find AppSizer at Apple iTunes, under the Utilities category.


AppSizer ScreenShots

AppSizer screw appAppSizer rotary appAppSizer calculator










AppSizer Installation

Where do I download AppSizer?   AppSizer can only be downloaded from Apple’s App Store or follow…
Do I need to have an account with Apple iTunes?   Yes.
How much does AppSizer cost?   99 cents.
Will I be entitled to free upgrade revisions?   Yes, but as long as it’s through the same iTunes account earlier revs were purchased through.


AppSizer User Help

Material Density
Steel = 0.28

Plastic = 0.04

Aluminum = 0.096

Brass = 0.30

Hardwood = 0.028

Mechanical Efficiency

Planetary reducer = 95-98%

Helical reducer = 95-98%

Worm gear reducer = 40-85%

Belt & Pulley = 95-98%

Chain & Sprocket = 95-98%

Rack & Pinion = 90-98%

Ballscrew = 85-95%

Leadscrew & Plastic Nut = 50-80%

Leadscrew & Brass Nut = 35-65%

Friction – CoF

Linear profile rail = 0.003-.005

Linear ball bushings = 0.001-.005

Self-lubricating = 0.09-.12

Steel on steel (greased) = 0.15

Plastic on steel = 0.015-.25


AppSizer FAQ

What will be in version 2.0?   The next version will include additional graphics and notes, which will make it more user friendly.
Are there plans to release a ‘Droid’ version of AppSizer?   We are currently looking at that. Please email us if you would like to be notfied on its release.
Will you eventually include other types of applications in AppSizer?   Please let us know what you would like included, and if it’s common enough, or asked for enough, we will try to add it to the AppSizer.
What if my hand calculations don’t match those from AppSizer?   Please send us details of your application and calculations, along with all the numbers you entered into each of the fields and the Units associated with each number, and we will review it for you.
Where do I find motor inertia?   This is found in the motor catalog for the brand of motor you will be using. Once you have determined the required speed and torque, just plug in the motor inertia for the motor that best meets your requirements. Don’t forget to update the motor inertia if you switch to a different motor, since all motors have differing rotor inertias.
Can results or entries from calculator or application page be sent to another application page?   Results don’t get sent automatically, but you can “cut and paste” results from one page into another application page.
Can I customize the motion profile to something other than triangular or 1/3, 1/3, 1/3 trapezoidal move?   We hope to allow for customizable motion profiles in the next rev.
What is a safe inertia mismatch to use?   Usually the rule of thumb is under 10:1. However, it depends on the accelerations and desired performance. High performance applications may require inertia mismatches of under 5:1. Conversely, low performance applications with low acceleration rates may be able to tolerate higher inertia mismatches.
Will Applied Mechatronics size my application?   Yes, but but since we get paid by getting our products specified in our geographic overage area, we may have to refer you to one of our rep partners if you’re outside of our region.

(Disclaimer: Applied Mechatronics LLC has developed the AppSizer tool as a guide for helping size your motion system. The parameters that are calculated should not be used for final motor selection unless reviewed and approved by a licensed professional engineer. The customer is ultimately responsible for their machine design. By downloading the AppSizer you agree to indemnify Applied Mechatronics LLC of all potential liability caused by misuse, application misunderstanding, or errors.)

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