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How to determine hole diameter in an oil jet? (For bearing lubrication)

How to determine hole diameter in an oil jet? (For bearing lubrication)

How to determine hole diameter in an oil jet? (For bearing lubrication)

(OP)
Hi guys,

I'm trying to work out the size hole I will need to put into a small oil jet to lubricate a bearing correctly.

I know the pressure of the flow and the flow rate needed.

Is there a "flow through an orifice" type formula I can use to figure this out?

[Metric units would be awesome if possible!]

Thanks
Steve

RE: How to determine hole diameter in an oil jet? (For bearing lubrication)

Use Q = Cv * Pi/4 * D^2 * (2 * P/rho)^0.5

Use SI units throughout

Q = flow in m³/sec
Cv = flow coefficient - use 0.8 for a typical drilled orifice
D = orifice diameter in metres
P = differential pressure across the orifice in N/m²
rho = fluid density in kg/m³

RE: How to determine hole diameter in an oil jet? (For bearing lubrication)

(OP)
Thank you very much, i will give it a go and see what I come up with.

Thanks again
Steve

RE: How to determine hole diameter in an oil jet? (For bearing lubrication)

(OP)
Would you also happen to know the calcualtions for determining oil flow required between 2 meshing spur gears?

RE: How to determine hole diameter in an oil jet? (For bearing lubrication)

Sorry - can't help with that question, but you might have some success posting on the tribology forum or the gear and pulley engineering forum.

Good luck

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