Black Friday Deal got me :)

This is the one I’m going to follow, I haven’t seen it before, but I started a similar idea in "show your stuff."

i was not happy with the force to spin this thing but it seems the bigger you go the greater the torque needed based on some digging with manufacturer specs i found. i found these that i could buy over seas but they require 3.5 Nm of torque. i'm not sure if that is breakaway or running torque? i'm thinking it's breakaway but i am not sure at this point. if i can figure out a way to test this so i can get a feel for it i might be at a fork in the road moment and end up just biting the bullet and buying these is it seems better than what i was seeing with what i was doing. 3,5 Nm seems like a lot of torque needed?

i have a question for anybody who does rotary plasma cutting. what kind of rpm range do you need on a rotary plasma system on the rotary axis? i'm checking into unions and these have a 100 rpm limit unless you upgrade the seals then i think they can do 300 rpm which is probably overkill. is 100 rpm enough or do i need a little extra. i'm guessing the part diameter factors in since the piece is rotating but i'm just looking for a general range of speed needed if anyone has a moment to reply.

thanks in advance

1-3m/m should be enough for cutting, so depending on tube diameter adjust accordingly by multiplying that diameter with the PI value of 3.1415....

i guessing the 1-3 m/m is m/min? metric conversions between units is not exactly my thing but if that is the case 120ipm is the high side. so it looks like things move pretty slow. 1 inch tube would probably be on the small side and spin the fastest so that's around 38rpm give or take.

my first attempt at a rotary union ended up being a bust. i was going to just eat the cost and buy these but something the manufacture said during a response made me pause on that idea. i was told a 2 Kw motor was the requirements to drive one of theirs. my plan was to drive two of these in series so a 4 Kw motor to do this seemed like a deal breaker. so i decided to take another attempt at one. i got tired of looking for a sealing solution from the manufactures that would work with common stock size and trying to find a certain type of seal in the size i needed. So i did what i had to and took matters into my own hands and designed my own and made a mold to cast them myself. so i will either get thing to work or go down swinging trying

I'm working on a second version of a rotary union, i feel good about this one working but until it's built and tested it's all wishful thinking I'm just going to make short videos as i go and post progress. it seems like it is an interesting topic, and it seems justified to spend the extra time on that end.

small update moving forward with this.

Music was nice!

another update