Author Topic: Question about angles of venturi (Read 7981 times)

Jamesrl · « **Reply #15 on:** August 09, 2014, 11:51:24 AM »

The quickest way to feck a lathe is to use it for spinning, there are some serious loads applied to shift the metal about.

Don't do it.

greasemonkey · « **Reply #16 on:** August 09, 2014, 04:52:14 PM »

Ah, right, scratch that then. I've got plenty of time to think about it now, while i weld the van up for MOT.........

Manfred · « **Reply #17 on:** August 09, 2014, 06:32:53 PM »

When I was in the trade we referred to normal lathe work as turning. I never heared of spinning until I came on this site. What do you mean by the term. Is it it as I understand turning to use a tool mounted into the tool post to cut material off of the spinning material which is held in the chuck, or something totally different ?

oakwoodtv · « **Reply #18 on:** August 09, 2014, 06:49:20 PM »

Its an art lots on youtube.

http://www.youtube.com/watch?v=43N44ICyuEU

Manfred · « **Reply #19 on:** August 09, 2014, 07:00:18 PM »

Wow, thanks. That explains how lots of things are made that I always thought were pressed.
Can see how it's brutal to tool posts tho.

Jamesrl · « **Reply #20 on:** August 09, 2014, 09:31:20 PM »

Quote from: Manfred on August 09, 2014, 07:00:18 PM

Wow, thanks. That explains how lots of things are made that I always thought were pressed.
Can see how it's brutal to tool posts tho.

I've just watched the tank dome end being made, a bit farty, the last one I watched being spun up was 40ft diam and 6" thick.

A proper dome end.

Tony · « **Reply #21 on:** August 10, 2014, 01:01:00 PM »

Quote from: Jamesrl on August 09, 2014, 09:31:20 PM

I've just watched the tank dome end being made, a bit farty, the last one I watched being spun up was 40ft diam and 6" thick.

A proper dome end.

Course Jim would know, that was the time they made his trumpet!

Julian · « **Reply #22 on:** August 10, 2014, 01:26:45 PM »

While on the subject of shaping metal things, if spinning isn't well known, has anyone come across hydroforming?

https://www.youtube.com/watch?v=I_Z3AIFSd60

https://www.youtube.com/watch?v=ppXRMTeR2NQ

https://www.youtube.com/watch?v=y0aphiMT4VE

https://www.youtube.com/watch?v=RQE9cJApSgQ

And the engineering world's biggest nutter ...

https://www.youtube.com/watch?v=llhcATrmsBg

Jamesrl · « **Reply #23 on:** August 10, 2014, 01:46:16 PM »

I hate to say it but yes, I've known about it for donkeys years.

A method use in the manufacture of brass instruments since just after the invention of hydraulics.

How about explosive forming?

Julian · « **Reply #24 on:** August 10, 2014, 02:09:52 PM »

I know you'd know!

Explosive forming ... yes.

If we're building a hot tub it would be a perfect tank. A little bit of oxygen and acetylene with womble in control, no problem!

Manfred · « **Reply #25 on:** August 10, 2014, 02:55:46 PM »

Does the Womble survive though.

Julian · « **Reply #26 on:** August 10, 2014, 03:16:05 PM »

Quote from: Manfred on August 10, 2014, 02:55:46 PM

Does the Womble survive though.

The idea is that he doesn't.

Tony · « **Reply #27 on:** August 10, 2014, 10:32:05 PM »

Jim doesn't hydroform, he just blows into the welded parts and up they pop.

Julian · « **Reply #28 on:** August 11, 2014, 12:19:33 AM »

Quote from: Tony on August 10, 2014, 10:32:05 PM

Jim doesn't hydroform, he just blows into the welded parts and up they pop.

Years of practise.

Manfred · « **Reply #29 on:** August 11, 2014, 02:14:33 PM »

That's what you mean when you say he blows his own trumpet. Here's me getting it wrong again.

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Question about angles of venturi