Heat Set Insert Press

Why Use Heat Set Inserts?

Heat Set Inserts are metal threaded inserts that can be inserted into thermoplastic using heat. The ribs on the insert create a strong mechanical bond resulting in threads that are significantly stronger and more wear resistant than tapped or 3D printed threads.

These inserts can only be used in thermoplastics like PLA, ABS, PETG.

Attempting to use these inserts in thermosetting plastics like Silicone, Polyurethane, Epoxies, can result in fire or dangerous off-gassing. Check with a technologist before using any outside materials with this machine.

Design Considerations

The inserts don't have significant design requirements, they only require enough clearance for the tool, which has a diameter of 0.45", so if you are placing inserts inside a pocket the center of the hole would need to be at least 0.225" from any edge. Additionally the clearance hole in the mating part should be smaller that the insert outer diameter to create the strongest possible connection. (See image for details). More complete design guidelines available from Spirol

Sizing Holes for Inserts

The lab stocks 6-32 and 8-32 inserts, the required diameters and depths for which are listed in the image to the right. Those numbers are the expected final size of the hole, be sure to consider the tolerances and offsets of the 3D printer.

Using the Heat Set Press

Always wear safety glasses when using the press, and be sure anyone near you using other equipment has them as well.

The tip of the press gets very hot >300C, be sure to use caution and not touch it.

Operating Instructions

Adjust the Press to the appropriate height for your part using the adjustment screws on the left hand side
Place the insert above the hole and align it in with the press
- If the press is already hot from previous pressings use tweezers to position the insert
Turn on the press and set the temperature to 330℃
- Wait ~30 seconds for the tip to heat up

Gently press the insert into the part until the top of the insert is flush with the part
Shut off the press when finished

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