oops! Ordered wrong half nipples?

[mobious]

I ordered (10) ROTATABLE 2.75" CF half nipples. However, while pricing feed-through's and Swagelok adapters I noticed they don't specify whether the feed-through or adaptors are rotatable or non-rotatable. Is this going to be a factor?

I think I'm mis-understanding the terms. I figured the rotatable and non-rotatable versions had seperate bolt patterns. Surfing the net it looks like the bolt pattern is always the same. So, does the rotatable version have some sort of "colar" that allows you to rotate then entire flange before tightening the bolts?

I'm glad I didn't weld them on....I'd really be kicking myself.

[UG!]

rotatable and non-rotatable CF flanges are compleatly compatable. only differance is (as you corectly guessed) rotatable flanges have a ring with the bolt holes in seperate from the pipe and the knife edge.

it shouldn;t be a problem, you'l just have a rather rattely fusor intil you bolt stuff onto the nipples

if welding rotatable flanges, be shour to slip on the bolt hole color first!

Oliver

[mobious]

brilliant! Thank you.

[DaveC]

Glen - as to the vacuum equivalence of rotatable vs non- rotatable flanges, ( the pipe stub/nipple won't rotate when it's welded to the hemisphere) - they are effectively identical.

However, for an application like a fusor, where your external geometry is probably not completely known at this time, rotatable flanges allow you align all the parts and fittings to put things where they need to be. You definitely need a few.

Dave Cooper

[mobious]

Thanks for the info. I had that thought in mind when I ordered them but scared myself by not making sure the "accessories" were compatible. Hind sight revealed it's mostly idiot proof.

I now have all parts for the sphere on-hand or in the mail. Anybody know a rough estimate for how much a machine shop would charge to mill my sphere's? I just need 5 holes poked in each hemisphere and maybe about 1/4" of the hemisphere removed at the lip to prevent the egg look. I'd like to know when/if I'm getting over charged.

[Richard Hull]

Depends on the Weld shop. Few work at $25.00/hr anymore. Most are $50-$75 per hour and the best are $100.00/hour. The best will take less time to complete the task once started due to modern tooling. Rush jobs command a stiff premium. I would think milling only would be $100.00-200.00 adding welding might double the price.

Richard Hull