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Modified compressor.
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davelectronic:
The oil a purchased is in the image below, I was going on the ISO 64 standardisation. So is that oil not suitable ? I did find an oil product Bambi compressors use, but the same oil, but generic so not a named brand. It was twice as expensive as the oil in the picture, that was purchased off Amazon.
BradC:

--- Quote from: davelectronic on March 31, 2021, 09:54:59 am ---The oil a purchased is in the image below, I was going on the ISO 64 standardisation. So is that oil not suitable ? I did find an oil product Bambi compressors use, but the same oil, but generic so not a named brand. It was twice as expensive as the oil in the picture, that was purchased off Amazon.

--- End quote ---

No, that oil is fine. It's a refined paraffin not a POE. You said you'd bought Polyolester, but that isn't.
davelectronic:
Oh ok, I must have got it wrong. I've looked at so many different oil types, I know it can't be as viscose as 10W 40 engine oil. The polyoester oil idea was just what I'd been reading on general functioning of hematically sealed compressors. If it's the right oil that's great. I've run into some mounting to the air receiver, with the position both compressors sit at. Got to get a larger plate to mount them on. Current configuration leaves it to unbalanced with weight to much to one side. Going with longer threaded rod M10 and get them centred above the receiver. And a hose thread to receiver is being difficult, I though it was 1/4 bspp female. That doesn't fit, 1/4 npt doesn't fit, I can only imagine it's 1/4 unf maybe.
Refrigerator:

--- Quote from: BradC on March 30, 2021, 01:43:57 pm ---
--- Quote from: davelectronic on March 30, 2021, 01:27:56 pm ---I've bought some polyoester oil ISO 64 I found a data sheet for these compressors, but oil quantity isn't on.

--- End quote ---

Take it back. It’s terribly hygroscopic and will just turn to acid. Flush it out and replace it with plain old mineral or synthetic air compressor oil. I’d use 4GS but that’s only because I have some. Pretty much any light mineral oil will do.

--- End quote ---
Plain motor oil should work also, afterall there's neither heat nor combustion in a compressor so it shouldn't degrade.
davelectronic:
The main reason I didn't want to put the wrong oil in was possible motor windings damage. I was finding it tricky to find the exact same oil as when it was a refrigeration compressor. Just filled both compressors to 250ml, no oil spitting. So nudged it up to 300ml in each compressor. If it's to much it will end up in the water trap I've yet to buy. I have waited over 20 years to try silent airbrushing. Over 20 years ago I got started on building a similar compressor, but for one reason or other it came to nothing. Shouldn't take much longer now.

The compressor I purchased as "silent" is not, in terms of garage / workshop compressors it is very quiet. But the oil less unit was over 70db, still to noisy for an apartment with people above and below me. When I purchased it, it was the silent part of the description had me convinced it would be fine. This is not a cheap option, the original compressor was £ 175 and a pair of refrigeration compressors where £ 88 posted. Still the cheapest Bambi compressor is just shy of £400 So if it works out it's not to unreasonable. Just have to mount them, plumb in and wire up.
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