Online Course for Hydraulics 101

Intro

From Tom Kelly; looks like a good resource of materials, though general and missing key technical specifications for implementation - such as specific performance and sourcing of other-than-hydraulic oil fluids for power transfer.

Content

Here are about 16 chapters on hydraulics in an easy to read format: search for site:etshare.pbworks.com hydraulic

For example, under “Fluid Power” https://etshare.pbworks.com/f/Ch06.pdf Different hydraulic fluids are discussed.

“Although water is readily available and inexpensive, it is not used alone: – Poor lubricant – Promotes rust – Freezes – Rapidly evaporates at temperatures within the operating range of many typical hydraulic systems “ (Use cooking oil if nothing else is available? Grow canola and process it for self sufficient hydraulic oil?) “Biodegradable hydraulic fluids reduce the harmful effects of fluid spills on soil and waterways 􏰀 Biodegradable fluids are: – Primarily vegetable-based oils – Easily broken down by organisms found in nature

TK: Some other possibilities are discussed, but it seems to me that regular engine oil is a good possibility. It is used in the old case, colt, ingersoll tractors and includes the ability to be highly viscous in cold weather, so it will pour and move freely, but also thick at higher temperatures so that there is no loss of power or leaks. It also has premixed additives that help with cleaning, foaming, etc.

To continue: “ Soluble-oil emulsion hydraulic fluids are used in metal forging, extrusion equipment, or other large applications 􏰀 Fluid designated as an oil-in-water emulsion contains only 1% to 5% percent oil – Extremely fire resistant – Requires typical additives – Subject to freezing Water-in-oil hydraulic fluids contain approximately 60% oil and 40% water – Limited anti-wear characteristics – System operating pressures limited – Has limited use because of instability and maintenance needs

Fire-resistant hydraulic fluids will not burn without sustained exposure to an ignition source – Water-oil emulsions – Water-glycol fluids – Synthetic fluids

Water-in-oil emulsion fire-resistant fluids contain approximately 40% water in an oil base – Not to be confused with soluble-oil emulsions and high-water-content fluids – Called inverted emulsions because water is suspended in oil, rather than oil in water Water-glycol fire-resistant hydraulic fluids usually contain 40% to 50% water with the remainder a polyglycol – Polyglycol is similar to automotive antifreeze – Fluids adversely affect some seal materials and paint All synthetic fluids provide excellent fire resistance 􏰀 Phosphate esters are the most common synthetic hydraulic fluids …”

Here is another set of chapters on electricity and electric motors: site:etshare.pbworks.com electric OR electricity

For example, “Large Electric Motors “ https://etshare.pbworks.com/f/Ch05Part07.pdf Ch05Part07

There are at least 15 pages of search material of essential engineering concepts: search site:etshare.pbworks.com