190Views5Replies

Author Options:

Machining inside cylinder vs machining thread? Answered

We are working with my kids on CAD project - precisely on a simple pressure valve for DIY confetti launcher. Yesterday question had occured: what is cheaper and easier for hand turner (alternatively cnc machine): to machine a nipple and  then turn a thread on a cylinder or to machine nipple inside cylinder? How much bigger is cost of one of these options? 

I prefer turning inside cylinder (no potential problem with sealing), anyway I'm asking this question to more experienced people.  

PS: Size is showed in mm. We consider using metric thread.

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
steveastrouk
steveastrouk

8 years ago

You can do it internally, but it takes special small, expensive, cranked tools. Why does it have to be "internal" like that ?

It would be millable, but the O ring groove tool would be murderously expensive.

Also, as you've drawn it, its impossible to assemble !

0
mdt2170m
mdt2170m

Answer 8 years ago

It's impossible to assemble. I showed this as very simple example of cross section because we were searching for an answer, why it is not common practice to machine complicated nipples inside cylinder. Thank You for an answer!

0
steveastrouk
steveastrouk

Answer 8 years ago

The last comment refers to your screwed in version.

0
kelseymh
kelseymh

Answer 8 years ago

"Impossible to assemble." Three words any physicist hates to hear from an engineer!

0
steveastrouk
steveastrouk

Answer 8 years ago

"Ye cannae change the laws of physics", as the great sage Montgomery Scott would have it/