Ribbit Rivet...

[DonRotolo]

Billfred & I have traded messages on the use of 1/4" rivets to assemble the kitbot frame instead of the 1/4-20 hardware. Estimated savings is a pound or three. This post to to share what we came up with, and solicit further input.

First, a riveter: Harbor Freight sells an inexpensive one here.

Then, rivets. McMaster has them (search item 97519A652 for example) but Grainger seems to be slightly more cost-effective. (Note that you'll need a variety of grip ranges)

Lastly, we thought that steel rivets with standard shear strength (1240 lbs) should be sufficient, but no testing has been done. While this is far less than the shear strength of 1/4-20 hardware, that same hardware appears to be overkill.

Upside is weight savings, downside is difficulty in dismantling the frame (never had a need to do that) and repairs if a fastener loosens. Perhaps an adhesive to reinforce the joints to further absorb shear.

Sources, ideas, thoughts, experience from teams that did it?

Don