Spenglermeister/in HFP cheat sheet

Verify actual material, exposure, finish and compatibility.

Develop blanks from the supplied bend, seam and neutral-axis model.

Select joining and movement accommodation for the complete assembly.

Trace water routes and inspect relevant concealed interfaces before closure.

Trace the actual structural, thermal, air, vapor and water functions.

Detail penetrations, outlets, edges and interfaces as part of the system.

Material chemistry alone does not specify a safe joining procedure.

Inspection, maintenance access and actual loads belong in the design.

Distinguish cladding, cavity, inner weather layer and supporting structure.

Design fixings and movement accommodation for the actual panel and loads.

BIPV combines enclosure and electrical functions with coordinated interfaces.

An open downstream switch does not make every sunlit PV component safe.

State the system boundary and assumptions before calculation.

Units, sign conventions and uncertainty are part of the answer.

Verification against a specification differs from validation for an intended use.

Drawings need a declared convention and controlled revision.

Classroom models do not authorize physical operation or structural approval.

Distinguish consumable-electrode, wire-fed and tungsten-electrode process functions.

Joint, material, position and procedure determine actual parameters.

Use the stated heat-input formula and unit conversions consistently.

Written process identification does not authorize live hot work or certify a weld.

Engineering stress σ = F/S₀ uses original area; E = σ/ε applies to the linear elastic region. Engineering stress itself is not confined to that region.

Toughness = whole curve area; resilience = elastic area

Hardness is not fundamental but correlates with strength

Grain refinement commonly increases yield strength in conventional metallic microstructures, subject to material and scale limits.

Selection needs specific indices (σ/ρ, E/ρ) plus cost and durability

Clarify actual responsibility, approved drawings and change authority.

Hazards require task-specific controls, not one universal PPE recipe.

Inspect concealed requirements before they become inaccessible.

Separate net quantities, stated allowances and unresolved handover issues.

Profit and cash differ because of credit, stock and capital spending.

Break-even = fixed costs ÷ unit contribution; contribution funds fixed costs and profit.

Gearing formulas vary; use the debt and capital definitions supplied in the exercise.

Payback ignores later cash flows; NPV discounts all cash flows.

Liquidity ratios need interpretation, not just calculation.

Capacity utilisation = actual output ÷ maximum output × 100.

Break-even = fixed costs ÷ contribution per unit; margin of safety = current sales − break-even.

JIT cuts holding costs but raises supply-chain vulnerability.

TQM is preventive and company-wide; quality control is inspection-based.

Critical path is the longest route through the network and sets project duration.

A metal roof is not automatically a complete lightning protection system.

Coordinate mechanical changes with electrical continuity and designed separation.

Type1, Type2 and combined surge devices have distinct actual application requirements.

Inspection and electrical work require competent controlled procedures.