I'd like thoughts on using sperm whale oil for lubricating precision mechanical measuring tools, i.e., micrometers. Are there any drawbacks? Are there better modern alternatives? Will it do the job adequately?
Just askin'. I remember a lot of discussion about it when I wasn't so old.
Here is a secret they don't tell you. Jojoba oil has almost the same chemical makeup of sperm oil, being a liquid wax ester and not an oil as such, and is unique in the plant kingdom in this regard as far as we know. Scientific studies seem to agree that jojoba oil has immense potential as an industrial lubricant much of which is yet untapped by industry. After the end of sperm whale hunting, manufacturers wanted to use the newly discovered jojoba oil to replace sperm oil but it was too expensive and so they came up with their synthetic alternatives. Jojoba oil is now farmed at higher rates, principally in Israel, and most of it goes to the cosmetic industry, but it is mighty fine as a lubricant. Best to find a bulk supplier rather than buying from a cosmetic supplier. I have had some for 15 years and it hasn't altered at all.
It functions well as a light machine oil and as a non-drying wood oil. I use it on my wooden cutting board and other various wood surfaces. I also use regularly brush it on my knives and tool steels to prevent rust and I plan to use it when I next service my fishing reel as a light oil. I also use it on electric hair cutters/trimmers.
For high pressure use, I understand it is best to use sulfurized jojoba oil, just the same as the sulphurized sperm oil was used, but I haven't seen this available for purchase. Similar to sperm oil, it also makes a very clean and bright oil lamp.
I haven't dealt with watch mechanics, but my guess it would work mighty fine. It is light, doesn't ever go bad and doesn't gunk up.
Hope this helps.