Oil for Phosphor Bronze

Possibly a better idea.

With plastic bearing, watch out for the bearing load.

Yes, but there are plastic bearings with high enough P (pressure) values for this; there is no problem with V (velocity) values in this application.

the idea seems good..but...they too have a limited life span..have'nt they?

So?

In some sense, everything has a limited life span, including oil-impregnated bearings. In addition, they may need to be relubed from time to time, risking oil in your juice.

Even if these bearings (either plastic such as PEEK, or metallic) wear out, they are easily and cheaply replaced.

As only a rough guess, I would imagine about a 200psi load on the bearings.

still getting oil...oh God! i should have chosen hydraulic type press instead of roller type

no oil, seal problems.

If I had to pick an oil, it would be olive oil.

I'd do as Tornado suggests. Is there a reason you need oil impregnated bearings?

yes...i don't want to put oil in my bearings cause that may seep into juice compartment despite all the sealing.

wet type P.bronze have to soaked for some length of time.

The Tech officers I used to work with considered simply soaking the Phosphor bronze bearings to be inadequate, they would boil them in the appropriate oil (starting from cold) for 10 to 15 minutes to drive out all the air and ensure that all the capilliary spaces were oil filled, then allow them to cool in the oil. Only then did they consider them ready for installation.

can that be done in home?

did he use wet type?

It can, in a metal can on an electric(not gas) hotplate.(flammable vapours)

we dont use electric stove. How to warm it on gas stove safely?

That is not a good idea inside a building/kitchen, unless you have a lid on it and keep the boil very gentle.

The STOs used an Oxy-Acetylene torch, gently in a workshop environment with a cover handy in case of ignition.

Ignition is a bad thing, not only because of the fire danger, but also because it can introduce carbon to the oil and thus the Phosphor bronze bush/bearing.

ok........i'll keep the flame very low and cover the top with lid and try to use a deep container

I fully agree with your suggestion.

Lubrication: Standard Phosphor bronze bearings

are impregnated with highly refined

mineral oil to ISO VG (SAE 30) having a high viscosity index and containing

anti-oxidant, anti-rust and defoamant additives.

Here are some basic rules for Phosphor bronze bearings:

1) Low viscosity oil for low temperatures, high speeds or light loads.

2) High viscosity oil for high temperatures, low speeds or heavy loads.

3) High viscosity index oil for wide variations in operating temperatures.

4) Oxidation stable oils for long-period usage.

5) Oil with 'oiliness' additives for boundary conditions.

6) Oil of lesser 'oiliness' for full film (hydrodynamic) conditions.

7) Oil with Extreme Pressure (E.P.) additives for very heavy or shock load

i discussed your idea of boiling for 10 mnts but the guy says that it is too ambitious and unnecessary. the P.bronze it self has a wet sort of stuff that can make it produce lubricant.

90wt gear oil. wrarm up the bronze to 180degf and let it cool in the oil. I have used "Never Sieze" as a lube before running cane through mine. Others have used Chevron Ultra Duty nlgi2 as a lube coating with good results.

Any mechanism that comes into contact with food must use a "food safe" lubricant.

Here is a form for searching by spec:

http://www.globalspec.com/SpecSearch/SearchForm/materials_chemicals_adhesives/industrial_oils_fluids/industrial_lubricants_greases

yes............but is it compatible with P.bronze?