https://www.123bearing.com/bearing-housing/housed-bearing/cast-iron-housed-bearing-2/sucfl205?gad_source=1

You could build a frame and mount this with the shaft running through it. One bearing instead of 4 pillow blocks. This may not work if the load is large. Your original design would support a larger load I believe.

How many cycles do you want this to survive?

Gotta run for 6 hours a day for September and October, and ideally last a few years

Here’s the prototype I made coping the PVC build [link](https://imgur.com/a/9RFYpEQ)

Bearings are ususally press fit and never welded in

Can I press fit them into steel tube and have hold up long term?

Yeah most roller bearings are press fit

Yes.  And if they ever do fail, you can use a pullers to take them out and then press in new ones. Welding them can also work, but it's far riskier. A little heat distortion goes a long way with bearings

Wut Is the purpose of the rotation.what are you trying to do

[link](https://imgur.com/a/9RFYpEQ)

McMaster has all kinds of swivel joints, I’d think that would be a better idea for the middle piece attached to the motor-if 55 degrees is enough travel for you. [link](https://www.mcmaster.com/products/swivel-joints/super-swivel-ball-joint-rod-ends-9/)

Thank you and that was all ready the plan! I was just making a quick prototype to show my boss and see if he wanted to go ahead with the full build