Hi Everyone,
My organization is looking to start torque testing threaded inserts in sheet metal. We have the specs on the inserts, so we know what the insert is designed to withstand. The testing would be done by an operator at the start of the operation, once the machine has been set up. My question is, do we test right up to the top of the tolerance or do we test to some percentage below the threshold? Also if anyone knows of any standards pertaining to torque testing of inserts, that would be great.
Thanks

Matt

Hi Everyone,
My organization is looking to start torque testing threaded inserts in sheet metal. We have the specs on the inserts, so we know what the insert is designed to withstand. The testing would be done by an operator at the start of the operation, once the machine has been set up. My question is, do we test right up to the top of the tolerance or do we test to some percentage below the threshold? Also if anyone knows of any standards pertaining to torque testing of inserts, that would be great.
Thanks

Matt

Matt,

Could this be a start (http://www.efunda.com/forum/list_message.cfm?start=1&thread=19361)?

Here's a listing of possible applicable standards (http://www.wmtr.com/Content/fastener_testing.htm).

NOTE: I am not associated with the company that provides testing services.

Stijloor.

Hi Everyone,
My organization is looking to start torque testing threaded inserts in sheet metal. We have the specs on the inserts, so we know what the insert is designed to withstand. The testing would be done by an operator at the start of the operation, once the machine has been set up. My question is, do we test right up to the top of the tolerance or do we test to some percentage below the threshold? Also if anyone knows of any standards pertaining to torque testing of inserts, that would be great.
Thanks

Matt

Is the insert welded or press fit or what other method is used to attached it?

What I understand from your post is that you want to test to failure and record the "break away" torque (max. hold on your torque tester). This is of course a destructive test and the part is probably scrap.

The break away torque can be charted and used for process control and SPC.

I doubt if testing to a level below the threshold is possible, because of potentiallly inducing a latent failure.

The inserts are press fit and we were thinking we would need to perform a destructive test. But I just wanted to see what some of you may have seen or encountered in the past.
Thanks
Matt

Matt,

I have never done this - but one idea might be to contact the manufacture of the hardware (pem, I assume) and ask them what they would reccomend.

Matt,

I have never done this - but one idea might be to contact the manufacturer of the hardware (pem, I assume) and ask them what they would reccomend.

How about this (http://www.pemnet.com/bulletins_A4/fedata_A4.pdf)? It includes references to Standards.

This may help too (http://www.pemnet.com/design_info/commonquestion.html)...

Stijloor.

I agree with the above. If the customer has not specified a minimum torque requirement, I would go with the manufacturer's recommended minimum torque values. If it is a press fit, there may also be a stakeout force/pushout requirement.

Hi Everyone,
My organization is looking to start torque testing threaded inserts in sheet metal. We have the specs on the inserts, so we know what the insert is designed to withstand. The testing would be done by an operator at the start of the operation, once the machine has been set up. My question is, do we test right up to the top of the tolerance or do we test to some percentage below the threshold? Also if anyone knows of any standards pertaining to torque testing of inserts, that would be great.
Thanks

Matt

Different customers have their own test methods and standards for torque testing of fasteners.
They are normally a test to destruction so you can record and monitor the torque value, or a torque overcheck on a higher frequency using a snap wrench set at the minimum torque specification.
Contact your customer and request their standards.