Restarting Efforts on Demo Fusor II

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John Futter
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Re: Restarting Efforts on Demo Fusor II

Post by John Futter » Sun Sep 13, 2020 7:28 pm

IMHO
milking rubber is much better --it also gives much better vibration isolation from the backing pump

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Rich Feldman
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Re: Restarting Efforts on Demo Fusor II

Post by Rich Feldman » Sun Sep 13, 2020 7:37 pm

Kuri is the same brand as my spiral hose.
John's a practiced expert with vacuum stuff, and I'm lately just a pretender. Have never set up any diffusion or turbo pump with a backing pump. Need to clear a path to a work space for vacuum gear, not touched (except for opportunistic acquisitions) in about 10 years.
[edit] I was successful using same kind of hose in 1" ID, for the project that brought me to fusor.net in 2010.
viewtopic.php?f=10&t=3977&start=10#p25528
Last edited by Rich Feldman on Sun Sep 13, 2020 10:39 pm, edited 1 time in total.
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Ed Meserve
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Re: Restarting Efforts on Demo Fusor II

Post by Ed Meserve » Sun Sep 13, 2020 8:22 pm

John,
Rubber hose like this? :

https://www.qcsupply.com/120312-epdm-se ... -4-id.html
rubber hose.jpg
3/4" Rubber Hose
Ed Meserve


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Dennis P Brown
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Re: Restarting Efforts on Demo Fusor II

Post by Dennis P Brown » Mon Sep 14, 2020 2:05 pm

The key to a useful foreline pipe is that it not collaspe; the vacuum level (as long as plasticizers aren't an issue) capablities are not terribly critical.

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Richard Hull
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Re: Restarting Efforts on Demo Fusor II

Post by Richard Hull » Mon Sep 14, 2020 2:46 pm

Over the years, I have used them all, but personally prefer the red india rubber sold by many vacuum dealers. It will not collapse as they sell it only in wall thicknesses which will not allow that to happen, based on bore and outer diameter. Early on I used the heavy black threaded auto water hose. It never collapsed. For a long time I used the steel internal coil steel reinforced tubing, but in 2004 switched to the red rubber. (I have seen it in white as well).....As always on the fore line try and keep the line under 1 foot long. Fusor V uses an 8-inch length of the red rubber from Duniway.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

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