Timing Belts




pulley and belt selection process

Step 1: Types of Timing Belts

Timing belts are use on timing pulley as motion device and for the work output. There are many different types of pitch or tooth profile belts. Pitch must be same on the belt and pulley. I buy most of my design belts from Stock Drive Products www.sdp-si.com. 

Step 2: Select Pitch

For example: Lets work with 3MM GT2 Pitch and my Center Distance between pulleys is 6 inch or 152.4 mm. Lets plug in the Center Distance formula to find the belt length. My Ratio is 2:1 and i am interested in Aluminum pulley. 16 and 32 tooth http://www.sdp-si.com/cd/default.htm.

Let's work with 3MM (GT2) Pitch and select belt and pulleys. I use this Center Distance Designer for my design. click this link. 


Ratio 2:1 and center distance 6 inch or 152.4 mm.
Small pulley that goes on the AC/DC motor is 16 tooth.
Large pulley that goes on my work output is 32 tooth.
Plug in the data into the CD designer to find the belt length. As you see 130 grooves or teeth recommended.


Step 3: Selecting Pulley

Aluminum Pulleys:
16 tooth SDP A 6A53M016DF0606 and  32 tooth SDP # A 6A53M032DF0606. 

Step 4: Pulley Drawing

Small and Larger pulley drawing for the reference. 

Step 5: Belt Selecting

Selecting timing belt since we know its recommended for 130 tooth and 6.00 mm wide.

Step 6: Selecting Shaft

As you notice on the selected pulleys that both have 6.00 mm bore size.
Note: Both pulleys bore tolerance +.025/-.000 
AC/DC motor must have 6.00 mm shaft.
Shaft selected SDP A 7X 1M060100 6.00 mm bore and 100 mm length

shaft is 5.996 mm and pulley bore is 6.025 mm, both will work fine.

Step 7: Design Assembly

Design assembly test phase.

List of Components on hand:
AC/DC motor
AC/DC power source (Adapter or Batteries)
Mounting Plate or Base
Stainless steel shaft
Drive pulley or small pulley
Driven Pulley or larger pulley
Timing belt

Test anything on the work output end, where the large pulley is located.



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    5 Discussions


    2 years ago

    Here is the updated link to the calculator. (As of 3/30/2016) https://sdp-si.com/eStore/CenterDistanceDesigner


    2 years ago

    Very informative! Do you think you can help me figure out how to find the pitch of a belt? I cannot find a clear answer. Thanks!


    3 years ago on Introduction

    Very informative; Thank you! Love the source; McMaster isn't bad but yours seem to e focused on linear motion design parts so it's easier to look up pulleys and belts!


    5 years ago on Introduction

    Pictures can be download for the design reference.