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Ridd Machinery Co Ltd Vacuum Pump


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  #1  
Old 09-12-2017, 03:21:44 AM
harrone harrone is offline
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Default Ridd Machinery Co Ltd Vacuum Pump

Hi fellow restorers,

I have just acquired a Ridd Machinery Co.Ltd vacuum pump exactly like the one in the following link:
http://eheritage.statelibrary.tas.go...l?ID=GSM_00015, can't find my camera at the moment to take a photo of mine.

Mine is almost complete except for the two clamps that hold down the valves on each end of the piston. The photos in the link site aren't good enough to get a good idea of the size and material used, bent steel or cast iron. Does anyone else have one of these pumps who could send me a few closeup photos of the clamps and measurements?

It's a big pump on a substantial cast on base with a 24 inch split flywheel. It's a New Zealand manufactured pump. Mine also has a donut shaped counterbalance wheel on the outside of that small flat belt pulleyshown in the link photos.

I'd also like to get some advice from you people about how to display it working without being connected to a milking plant. Can they be run as a water pump somehow? I avoided vacuum pumps in the past as I couldn't think how to show something that just creates a vacuum.

Cheers

Mark
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Old 09-12-2017, 06:07:46 AM
Darryl Darryl is offline
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Default Re: Ridd Machinery Co Ltd vacuum pump

Hi, I've got several piston vacuume pumps so I'll have a look tomorrow at the clamps, i know at least one has them. I doubt the thing you mentioned would be a counter balance because they would be lucky to do 100rpm's, probably an eccentric for the pulsators.
Dont know how to display one but I've got one driven by a cs Lister that blows my forge.
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Old 09-12-2017, 10:34:34 AM
harrone harrone is offline
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Default Re: Ridd Machinery Co Ltd vacuum pump

So, could I run it like a forge blower, with a cage over the outlet pipe with a ping pong ball in it showing that it is doing something?
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Old 09-12-2017, 05:04:50 PM
Darryl Darryl is offline
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Default Re: Ridd Machinery Co Ltd vacuum pump

Why not ? Or you could make cane toad balloons and hand them out to the kids.
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Old 09-12-2017, 06:00:13 PM
harrone harrone is offline
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Default Re: Ridd Machinery Co Ltd vacuum pump

How is a vacuum pump different from a compressor pump?
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Old 09-12-2017, 06:42:54 PM
Scotty 2 Scotty 2 is offline
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Default Re: Ridd Machinery Co Ltd vacuum pump

Quote:
Originally Posted by harrone View Post
How is a vacuum pump different from a compressor pump?
One sucks and the other blows.
Enough of the sm@rt@rse comments. That's done and dusted....but good question I reckon.
What is the difference?
It would have to have something to do with continual use wouldn't it? An air compressor will pull your open hand in if you place it over the air inlet...but how long would it suck on your hand until something over heats or plays up?
The same could be said for a vacuum cleaner. You could block the outlet up but how long would the vacuum last?
Remember the old vacuum cleaners that you could put the hose in different ports and you could use it as a vacuum or plug the hose in another port and it would blow air out. Electrolux made use of that and you could get paint or poison sprayers for your vacuum cleaner. We have some somewhere under the house.

As for a display. I've thought about that and I came up with is to use a biggish smooth ball. I'd make a bit of a large diameter pipe (PVC) that goes to the fence from the pump and have people tugging on the ball to show how much effort it takes.
If taking to the fence is not an option (bloody insurances), I'd use the same sort of ball but hang it upside down off the pipe and hang weights off it to show how much suck it has. if you get the weight right, you could suppend the ball in mid air.
I have seen a great display with a vacuum pump and pulsator where a chap made up a series (about 6) of vacuum tubes that sucked up pingpong balls in a sequence. I had a picture but cannot find it at the moment.

Cheers Scott
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Old 09-13-2017, 04:41:44 AM
Darryl Darryl is offline
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Default Re: Ridd Machinery Co Ltd vacuum pump

Is this the same
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Old 09-13-2017, 07:55:58 AM
harrone harrone is offline
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Default Re: Ridd Machinery Co Ltd vacuum pump

No, Mine has a single valve at each end of the piston which is held in place by a clamp similar to those used on the old glass bowl fuel filters where the clamp can be tighten by a nut on top that puts pressure on the valve head. I can see them in the pictures on the link above but can't zoom in enough to get an idea of how they a constructed. See the link in the first post of this thread.

---------- Post added at 09:55:58 PM ---------- Previous post was at 09:35:19 PM ----------

Hi Scotty,

I can't say that I really want to display how it creates a vacuum effect, but if it works like the old vacuum cleaners, I'm sure I could display something being affected by the blower pipe.

So a compressor pump sucks air in and blows it somewhere. and a vacuum pump also sucks air in and blows it somewhere. Is the main difference between the two, the amount of pressure the air is under when it is blown out. Compressor pumps need to get rid of the heat generated, by cooling fins around the barrel and head. As vacuum pumps don't seem to have fins they must run much slower and don't generate much heat. Is this right?
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Old 05-07-2018, 07:29:31 AM
harrone harrone is offline
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Default Re: Ridd Machinery Co Ltd vacuum pump

Not sure why I haven't added pictures of mine yet but here goes.
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Old 05-09-2018, 02:47:47 AM
cobbadog cobbadog is offline
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Default Re: Ridd Machinery Co Ltd Vacuum Pump

You mentioned insurance issues with having something attached to the fence. Well I have seen on many occasions a rack that attaches to the fence for the public to drop aluminium cans down to be crushed. At each Rally I have seen it at there has been no issues with insurances so that must be ok to do. All moving parts are well with in the boundaries of where the engine and moving parts cannot be touched by the public. Also seen water demonstrations that required the public to operate a handle to see what the pump does and again no issues.
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