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Milking Machines

Darryl

Registered
The one on the left is a McDonald and is pretty old and rare, with the reduction pully to drive the pulsators.
 

RustyNumbat

Registered
Thanks for that Darryl, got the McDonald open and she looks a right mess. Hopefully I can find some suitably sized bearings to replace, and clean up the insides. I've seen a video of someone restoring a vane similar to this so hopefully it's pretty simple. Since it's a vane pump, then it's not for vacuum but for liquid?



For something sitting idle outside for 50 years or more she had very little water inside, and the bolts and screws all came out like they'd been greased last week!

My old man held the second-hand remembered opinion that these things were as good as gold and would last forever as long as you kept the lubricating oil up to them.
 
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E27N

Subscriber
Last Subscription Date
01/06/2020
Numbat, vacuum vane pumps exist. The vacuum pump for brakes on a lot of diesel vehicles use a vane pump and use the engine oil to help seal and lubricate.
 

RustyNumbat

Registered
Hmmm maybe if I pull out my finger I can have it done in time for the Warren show this weekend, or failing that the vintage field day in Bridgetown weekend after...
 

Darryl

Registered
Always put the vanes back in the same slot but especially facing the same direction . Here's the name plate off a pump i just sold. Maybe a bit older than yours ?
 

Attachments

RustyNumbat

Registered
Should I be giving the internal parts a quick sand blast to remove the rust and such, or is it safer just to lightly wire brush and scotch pad it?
 

Eric Schulz

Registered
Last Subscription Date
09/02/2009
There may be a bit of misunderstanding here. A dairy vacuum pump is just that, it is not a vane type liquid pump. If, when milking the cows, any liquid coming out of the vacuum pump exhaust would be an indication that something has gone very wrong.

Of course these pumps would pump water. It's just that they wouldn't last very long, as the completely unshielded ball bearings would have their lubrication washed away. The vanes would also be unlubricated.

Eric
 

RustyNumbat

Registered
Thanks Eric! I'd been told by my aunt they're vacuum pumps, and she'd know given she was around when they were still being used. But seeing they were vane pumps confused me as I didn't know they could be used for vacuum!

Any hints on how the vanes connect in, is there a keyway, do they typically slide in from one side etc?
 
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Darryl

Registered
They just slip into plain slots, some pumps have springs behind the vanes. Some vanes are made of bronze.
Modern time pumps can have a sort of fibrous material, better for higher speeds but your pump would only do about 100 rpm.
The vanes tend to wear in opposed to wearing out, thats why you need to put them back the way they come out.
 

RustyNumbat

Registered
Thanks again Darryl!

Sand blasted and painted with grey primer today, think I'll even go to the huge effort of airbrushing the enamel brunswick green on top! I think I'll do the beltwheel red though. The inside of the housing has a fair bit of bumpy rust buildup on it, so I'll have to make sure I get it smooth again for the vanes.

Is it possible to make up your own belts out of leather? I have a few rolls of full thickness leather and a bunch of leather rivets and such, wondering how hard it is....
 

RustyNumbat

Registered


Got a the vanes out, a bit of a sand and some oil and they move freely!

Interestingly it's sprung on one side, the pins move through the middle of the shaft to push the other side out when the spring side goes in.
 

Power

Registered
Inside looks like a GHAST vacuum pump. Carbon vanes. Used a lot in medical field. The suction device in dentist's offices often have a smaller version of this pump.

The vanes look good. Clean the rust off the rotor, or pieces may flake off and score the cylinder. I rebuilt quite a few, still have new carbon vanes someplace. The ones with the springs were designed for higher vacuum. Some had an oil mist to lubricate vanes.
 

RustyNumbat

Registered
Getting there, just need to finish getting the inside wall super smooth, quite a lot of pitting from the rust. A round forward-facing wire brush in a drill has made fairly short work of most of it.



Seems the brunswick green enamel actually could be used directly on the cleaned metal, this blend doesn't ask for a primer! Oh well, the more the merrier. So glad I bought an airbrush kit, even if it's the cheapest job going it gets it done.

I appreciate everyones advice, does anyone know more details on the model? It'd be nice to have the proper name and estimate year of manufacture to put on a display card.
 

RustyNumbat

Registered
All ready to reassemble, had to check my photos to make sure everything went the right way. I'm guessing now I have to oil everything up real good before inserting and sealing. Handily there's an arrow on the cast showing me which way it'll want to turn! I still can't figure out why the vacuum end has a big pot on it, unless that's a debris catcher or something.

 

RustyNumbat

Registered
There's a lid to the "pot" which has a falling to bits rubber insert in it, so I guess it sits on top and is freely held against the pot by the low pressure. I'll have to work out an interesting way to display the vacuum effect if I'm going to show it, perhaps I'll need to find a pulsator. But getting ahead of myself here, need to finish re-assembling and making sure it works first!
 

Darryl

Registered
There was a receiver can where the milk from the cups accumulated which drained off to the vat, the vaccume pump sucked from the top of that receiver but if something went wrong or moisture got into the suction line then hopefully it would get caught in that little pot which has a rubber flap on the bottom hole so it would " self empty" every time you shut down the plant. Does the lid have a vacuume outlet in it because my lid is missing? if not then the rubber flap hole must be the suction port.
 

RustyNumbat

Registered
The lid is just a solid piece with four screws I assume are to hold the rubber pad within it. It just sits over the large round hole, I'll post a photo eventually.

*sigh* I found I've put in the insides the wrong way around, though I'd checked it twice. So it'll all have to come apart again and get juggled back in! And it was such a dog getting the gaskets to sit properly the first time around!

I put it in with no gaskets first time, as there didn't seem to be any when I disassembled, but then found the inside drum to stick out by about a mm, so made up some gaskets and it fits nicely.
 
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