enots brass pumps?

[Pete.]

Stuff you have made today

Did a bit of work on my gear hobber. First was a belt guard for the cutting oil pump. This is driven off the main motor and is a gear pump that sends oil from the reservoir up to the hob which then drains back down from the tray into the reservoir. It's about 60 or 70 years old and tends to...

www.mig-welding.co.uk

 

[123hotchef]

Yep you set the flow at the tap end and the rest goes by the ball and spring. The spring sets the pressure at the tap, the tap sets the flow. Use a light spring so it doesn't jet past the tap when it's only cracked open.

I am thinking parker pen type spring here

 

[123hotchef]

is that it Pete? I take it that is a push fit fitting the other end

 

[Pete.]

Yeah that's it. I re-purposed some random fitting but you could just as easily turn something in half an hour.

 

[123hotchef]

I am sure I can find something to cobble together, some copper brake line and fittings I reakon.

 

[Pete.]

Tbh I think the grundfos is going to be miles too pokey. They have a decent output whereas you need dribbly tap flow rate.

 

[Seadog]

A small aquarium pump would be better.

 

[123hotchef]

Would the seals be ok long term in a aquarium pump running cutting oil

 

[addjunkie]

If its a true centrifugal pump they can be run with a closed discharge valve. In fact in most process use they are-fitted with at least a check valve in the discharge line, and often a motorised discharge that remains closed until manually opened or operated by a control system.
The spill valve in Petes post is how you would operate a positive displacement pump. But no harm in a centrifugal pump either.
I used a pond pump for a while, worked ok, wasnt dear. And sat in the coolant tank.

 

[123hotchef]

I will be using neat cutting oil not the water solulable stuff.

 

[Pete.]

Some centrifugal pumps have a limited time to run with a closed outlet because the flowing liquid carries away heat. Our hippos ae 2hrs max IIRC. No limit if they are actually pumping though.

 

[123hotchef]

are we talking about something like this then?

Aquarium Systems Maxi Jet Multi Purpose Pump 500 lph-1000 lph

Multi-purpose pump used with both salt and freshwater aquariums Efficient, compact and powerful 3-year guarantee

www.swelluk.com

 

[123hotchef]

Pardon our interruption...

not sure how long a fog machine pump would last

 

[123hotchef]

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going of one of these instead, At least the seals are well should be ratted for fuel

 

[addjunkie]

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going of one of these instead, At least the seals are well should be ratted for fuel

Should work well that with a spill back!

 

[123hotchef]

Should work well that with a spill back!

Do you think it will need one? I will wire this via the DOL starter with a manual switch also.

 

[addjunkie]

Do you think it will need one? I will wire this via the DOL starter with a manual switch also.

Looking at the flow rate I would

 

[123hotchef]

Looking at the flow rate I would

Great, I will try without first if it is too fast then I will ad it in, I wonder if dropping the voltage down from 12V would slow it down or if the pump might not run at all

 

[123hotchef]

well that pump would not pull the oil through maybe it is a bit too thick. or the pump needs some more amps I will try that tomorrow

 

[addjunkie]

well that pump would not pull the oil through maybe it is a bit too thick. or the pump needs some more amps I will try that tomorrow

Did it have a positive suction head, and was it primed.