Cart Robot

[blackjack102]

I saw this http://www.robotshop.us/phidgetstepper-unipolar-4-motor.html and wanted to build basic "cart robot". It could support 100 lbs. I looked many material from this forum like http://www.sdp-si.com/. However, I could not find nice angle clamp. I found only http://www.servocity.com/html/90o_clamping_tube_hub.html, but it is not enough information or good enough for the cart.

I could use shafts to build the cart; however, I do not want to weld them. I want to build a cart and can change the structure if needs to. I am not sure what is called clamp or something that you could suggest.

Thank you so much

I made in 3d model:

[airman00]

Maybe use some piping and drill into it?
Sort of like this

[Admin]

It will probably be cheapest to just custom make your own.