Gast vacuum pump hose

[Allan Pleaner]

The hose from the vacuum pump to the headstock collapses slightly in on itself, due to the vacuum. Wondering whether to use a stiffer plastic hose - this one is rated for well over 26 psi. I think the vacuum action caused this collapse. Any thoughts most welcome. Cheers

 

[Bill Boehme]

You need a much more substantial hose than that. A hose rated for 26 PSI means the internal pressure and not a vacuum where atmospheric pressure could flatten the hose. Look for a thick walled reinforced rubber or PVC hose.

 

[john lucas]

I used the clear web version above and it does not collapse but it gets really stiff over the years.

 

[Bill Boehme]

I used the clear web version above and it does not collapse but it gets really stiff over the years.

Yes it certainly does that. I'm thinking about switching to a rubber hose.

 

[Bill Blasic]

I use clear pvc hose from the bin at Lowes and have never had a problem.

 

[Tom Gall]

The hose from the vacuum pump to the headstock collapses slightly in on itself, due to the vacuum. Wondering whether to use a stiffer plastic hose - this one is rated for well over 26 psi. I think the vacuum action caused this collapse. Any thoughts most welcome. Cheers

I use a 3/8" ID quality rubber air hose with 1/4" NPT fittings. Length doesn't matter .... think of the excess length as a reservoir tank! I only use the braided clear hose to slide over a short piece of lamp rod (about 3") attached to my rotary adaptor. This is a perfect fit to slide into my spindle (hand wheel side). Quick insertion - one second in & one second out. I also have a short piece (12" ?) attached to a swivel fitting.....that most people don't have and don't need.

 

[Allan Pleaner]

Thanks so much to you all - this is really helpful.
Also for the quick responses. Much appreciated.

A new question and I'm wondering if there's a discussion on this out there already: I'm reverse chucking a bowl,
and am using a threaded live centre on tailstock -
screw on the vacuum chuck so that is centered on the open face of the bowl. Keeping this
center, I then screw off the vacuum chuck and holding it in place on the bowl manually, screw vacuum chuck onto the headstock.
This way it stays centered. This method seems clunky and I'm wondering if there's a better way to reverse chuck and
maintain centering using the vacuum chuck. Hope this makes sense.
Any thoughts very welcome?

 

[Clifton C]

Since you have a threaded live center, leave the bowl attached to chuck and screw both onto the live center. Install vac chuck onto head stock spindle then bring up tail stock with bowl. I usually turn/spin the whole assembly by hand while tightening up the quill, turn on vac, then release the bowl tenon from the chuck. Sometimes it just doesn't want to play, then I lower the vacuum and bump the bowl into position. The key then is to remember to increase the vacuum before turning. Yep, learned that the hard way.

 

[Allan Pleaner]

Since you have a threaded live center, leave the bowl attached to chuck and screw both onto the live center. Install vac chuck onto head stock spindle then bring up tail stock with bowl. I usually turn/spin the whole assembly by hand while tightening up the quill, turn on vac, then release the bowl tenon from the chuck. Sometimes it just doesn't want to play, then I lower the vacuum and bump the bowl into position. The key then is to remember to increase the vacuum before turning.

Yep, learned that the hard way.

Excellent advice - thanks so much