Stiffener Plate

One way of checking screw threads is by means of "go" and "no-go" gauges, which are basically screws just slightly undersized ("go") and oversized ("no-go"). The "go" gauge should screw all the way in. The "no-go" gauge may be tapered so that it will start, but soon will become tight and advance no further.

Automating this would entail translating the plate so that the pair of gauges could be tested in each hole, and then measuring how far each gauge advances.

Such devices can be built, but what quality level are you after?

Inspection of a single threaded hole has multiple parameters that could be defined (and thus checked) with different techniques for each parameter.

Relative position and aligment of the holes relative to the plate again introduces more features to be checked.

What precission is needed for the measurements?

Look around for a local automation supplier and have them develop the system with you. It could be anything from a simple automatic optical inspection device to a very expensive automated "robot" with torque sensors and interchangeable thread gauges.

The present inspection is by using the electrical hand drill screwing inthe screw into the screw holes. Normally the screw holes is abt 40-100holes. Manual check by screwing the screw into the holes caused damage to the thread and its so much human dependant where I believe mistake can happen almost all the times. I have checked from the internet for robotic system of placing and removing screws but in vain. Is there any customize robotic we can place an order?

Seems that you only want to verify presence of thread in the holes and not quality of the thread (since you indicate you are already using screws only.)

I suggest that you contact your local pneumatic equipment supplier and get a torque limited air driver (low inertia) where you can adjust the applied torque on the screws and avoid stripping and so on. This would be a cheap alternative.

(You would need a second driver with higher torque setting in reverse to remove the screws, making this a two person sequence where the second person verifies that first person has fitted all screws successfully.)

Remember to replace the screws regularly as they will wear through constant use.

Yes, you're right...This is the way we are doing it presently. I am thinking that there might be a scanning device, x ray device or robotic system to fix the screw and tested the holes rather then using the human. This may reduce the cost. Any recomendation?

Five years ago I might have been able to provide contact details for companies capable of this, but roles and employers have changed.

Sorry but unable to help you further.

Thank you so much, my friend

This company make thread depth checkers, they also do a powered version.

Here's another one with an auto reverse & indication that the gauge depth was OK.

Hi Thank you for the help. I have send mail requesting help from bottleneck. Hope to hear from them soon. Thank you again

Contact Trace Laboratories. They custom design and build test rigs/equipment. (217)617-4409 and ask for the Laboratory Director. or go to website www.tracelabssolutions.com

good luck!

Gi, Appreciated of the contact you have given. Thank you again.