Rivet Nuts

[roystur44]

http://products.kvt-koenig.us/katalog/katlist.jsp?kat=9&txt=FILKO+BLIND+RIVET+NUTS&gclid =CIjF0vH627MCFSPhQgodpSIApg

Rivnuts are great for creating strong threads on thin wall tubing less than .125" thick. We will use a rivnut if the mating part needs to be removable. Otherwise we would use a pop rivet and join the parts together.

The correct pilot hole must be drilled for the hardware. We tend to stick to #10 nuts. When installing the hardware a manual hand gun can be used. We have a pneumatic gun to install the hardware fast and exact every time. Takes a couple of times to get a hang of using the tool. A incorrectly installed rivnut will spin in the hole not allowing the user to unscrew the hardware.

Here is a youtube of the pneumatic gun
http://www.youtube.com/watch?v=Nv_rA8LNvcc

[MichaelBick]

Thanks for the tips Roy. Do you guys use the standard, knurled, or hexagonal shank rivet nuts?

Cory, thanks for the idea on the extra plate. We might do that if rivet nuts start stripping. I don't think we can tap our tube because we plan to primarily use 1/16 wall tube. Also I don't like nuts because it is another thing that we can lose if we run into a quick change in eliminations.

Greg we will look into weld nuts and pem nuts if Roy's suggestions don't end up working. We hace access to both a press and a welder, but it seems like the rivet nuts are the easiest to install.

[Madison]

We've used rivnuts in some places and often have some difficulty with them turning in place. I try to avoid using them for anything critical and would favor a captive or welded nut if possible.

If you have work done out of house, you might also investigate form drilling as an option.

http://www.youtube.com/watch?v=NhkWINPRK3A

[roystur44]

Micheal,

Zinc plated steel, knurled, counter sunk head, grip range .020 to .140, open ended


The manual insertion tool is ok but requires practice to get it right. The pneumatic gun is the bomb but costs$$. Amortize the cost over the life of the tool and it's value to the robot.

The nuts come in different thread sizes but we try to standardized all our hardware on the robot. A #10 screw is a good choice for mounting manipulators. 1/4-20 is a little overkill.

FYI if the material is thick enough >.120" you can tap the material. If the thread strips you can drill out the thread and install a Rivnut. If you have alum pop rivets shearing because of load forces a steel rivnut and a screw can be used.

Try them out and see if it works for your application. Don't be discouraged when others say they have problems with using this hardware. It's good to have a understanding of what you can do with these in your Robot toolbox.