[FAQ] - Assembly Tool Floating Spindle

Question

1. What is a "Floating Spindle" for assembly tool applications?
2. In what applications should a Floating Spindle be used?
3. What is the selection criteria used to properly specify the Floating Spindle required for the selected assembly tool/nutrunner that will be used in my application?

Environment

Automated assembly operations where pneumatic or DC Electric fastening tools/nutrunners are used in an assembly line production environment.

Answer

1. What is a "Floating Spindle" for assembly tool applications?

A Floating Spindle is special output spindle that is usually attached to an Inline Assembly Tool/Nutrunner.  When a force is applied to the Output Shaft, the Shaft is compressed into the Spindle Body from its fully extended position (C) to a compressed position (B) as shown in the drawing below.  When the applied force is removed from the Shaft, a Spring inside the Spindle Body returns the Shaft to its original extended position.

Floating Spindle Stroke, or what is known as "Float," is the total travel of the Spindle Shaft when fully compressed from its extended position (length "C" minus length "B").  The amount of stroke for a given tool model is normally shown in our Assembly catalogs under the column with the following graphic.

2. In what applications should a Floating Spindle be used?

Floating Spindles are designed for easily seating the socket onto the head of the bolt to be fastened in automated assembly operations.   As a fixtured tool is lowered onto the workpiece with the spindle slowly turning, the socket rotates until it drops down over the head of the bolt prior to the start of the fastening cycle.

Most Floating Spindles are used with Inline assembly tools/nutrunners that are fixtured and automated, although they can be used on handheld operations as well.

3. What is the selection criteria used to properly specify the Floating Spindle required for the selected assembly tool/nutrunner that will be used in my application?

The following selection criteria is used to chose the best Floating Spindle for the application:

• Select the shortest spindle that allows access to the fastener.
• Be sure the spindle length allows for access and clearance for the application.
• Choose the output drive type and size for the Floating Spindle, keeping in mind the required torque output for the application.

For Additional Assistance:

Please contact our Technical Support Team at IRTechSupport@irco.com if you require additional assistance to identify a specific tool model with a Floating Spindle for your application.