Bolt Preload and Torque: How to Calculate Clamp Force
Turn torque into clamp force with T = K.D.F. Nut factor, 75% proof-load target, and a 1/2-13 Grade 5 worked example showing why lubrication changes everything.
Shelle Parsons
O-Ring Groove Design: Sizing a Gland for Static Seals
Design an O-ring gland right: squeeze, gland fill, and clearance targets plus a full AS568 -214 static seal worked example for groove depth and width.
Hydraulic Hose Pressure Drop: A Practical Worked Example
Size hydraulic hose by fluid velocity and compute pressure drop with Darcy-Weisbach. Recommended velocities, Reynolds number, and a full 15 gpm worked example.
How to Calculate Bearing L10 Life (ISO 281 Worked Example)
Calculate rolling bearing L10 rating life per ISO 281. Formula, ball vs roller exponents, a full 6208 worked example, and the adjusted Lnm life explained.
Color Contrast for Engineering Documentation: WCAG, Safety Colors, and Spec Sheets
Contrast ratios, colorblind-safe design, ANSI/ISO safety colors, and keeping a specified color consistent from screen to RAL/Pantone print in engineering deliverables.
Resolving Force Vectors: Components, Resultants, and a Worked Statics Example
How to resolve a force into x and y components, sum them, and recombine into a resultant with the correct quadrant angle. Two-cable worked example and the sign traps to avoid.
Hydraulic Hose Sizing and Pressure Drop: A Practical Selection Guide
Size a hydraulic hose from flow and pressure using the three velocity limits and a Darcy pressure-drop check, plus how to read SAE dash sizes. Worked example included.
Bearing Fits Explained: Choosing Shaft and Housing Tolerances (ISO 286)
How rolling-bearing fits work and how to pick shaft and housing tolerances (h6, k5, H7) from load and rotation, with an ISO 286 worked example on a 6205 bearing.
The Lake Had Been Holding Its Breath
🔠Exploration On the night of August 21, 1986, Lake Nyos in northwestern Cameroon exhaled once and killed 1,746 people in the villages below it. There was no bang. There was no smell. There was almost no time. A cloud of carbon dioxide, denser than the air around it, rose out of the water in … Read more
Choosing the Right Seal Elastomer: A Compatibility Guide for O-Rings and Hydraulic Seals
NBR, FKM, EPDM, HNBR, silicone, or PTFE? A practical guide to matching seal elastomer to fluid and temperature — with a quick-reference compatibility table and the classic mistakes that cause seal failure.