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What oil to use for gearboxes and headstock on the Edgwick lathe

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mattinker:
I put the link (http://www.lubetechshop.co.uk/product_info.php?cPath=25_40&products_id=86) in because it has the specifications on it. It looks like pretty ordinary Hydraulic oil!

Regards, Matthew

PekkaNF:

--- Quote from: mattinker on July 19, 2015, 05:01:02 AM ---I put the link (http://www.lubetechshop.co.uk/product_info.php?cPath=25_40&products_id=86) in because it has the specifications on it. It looks like pretty ordinary Hydraulic oil!

Regards, Matthew

--- End quote ---

Well, it is hydraulic oil, but pretty thick. It iso ISO VG 100 and we use in industrial hydraulic unit 32 or in very hot environment 46.

I have seen hydraulic oil used very succesfully on lathe gearbox. That would be my starting point, if the manufacturer hasn't spesified very different oil.

Also normal "straight" spurr/helical gear reducer oil would do nicely on normal gearbox. Some argue that "old" oils did not have additivies and it would allow sediment to settle on bottom of the gearbox, but these nwe oils do best to prevent sedimentation and therefore should be filtered. Anyway hypoid oil should be avoided as mentioned before.

There are some points though. Does tje lathe has wet coupling or brake? If so, then "farm" oil migh be a best choise. It is cheap too and very available.
http://www.penriteoil.com.au/products.php?id_categ=14&id_subcateg=76&id_products=162
The one linked is pretty thin, often they are ISO 46 or SAE 30. Might not stay put on very old machines.

I asked prety many opions for my old milling machine and this was prety much I got told. It has straight gear and a coupling. Farm oil went in and stayed there.

Pekka

Edgwick one:
Mobil make a Synthetic gear oil which contains no Sulphur or Sulfur for our USA friends it is called Mobil one synthetic gear oil they said it would be perfect and easy to obtain

dawesy:
I use a standard 80w90 GL-5 in my Churchill. Most transmissions use brass synchros now so should be fine. As always that's what I do but you're free to make your own decisions

Howder1951:
Hello everyone, oils are one of my favourite topics. when i was dealing with the rep for our steel mill I asked about lathes and he said that is easy, hydraulic oil 68 cst viscosity. Explanation: hydraulic oil  has a mild antiwar additive and lathes are typically lightly loaded. The more additive in an oil the quicker it will degrade from the additives = impurities. Also like someone had mentioned, some EP (extreme pressure) gear additives are not completely compatible. Generally, this information will conform with the original manufacturers recommendations .  Motor oil is an accepted alternative to hydraulic oil where availability is an issue. A higher viscosity will give a thicker oil film and more protection, but the cost is heat generation and resistance, a lathe gearbox is typically over engineered for accuracy reasons, hence the light loading.
Happy machining my friends.

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