Work it out.
Calculators
Which crane certificate does the crane require?
BEK 1978/2021 §§ 4-6 and 8
Lifting people by crane
BEK 428/2022 § 59, subsection 2 + annex 1
Inspection calendar for cranes and gear
BEK 428/2022 §§ 58 and 73 · BFA-BA colour code
Sling load when slinging
Kraftparallelogram (trigonometri)
Sling utilisation (WLL)
EN 13414 / grejets mærkning
Load moment and max. load at radius
Momentligning M = F × r
Wind force on a suspended load
DS/EN 1991-1-4 (vindlast)
Ground bearing pressure under outriggers
P = F/A (trykfordeling) / DS/EN 1997-1 (geoteknik)
Workpiece weight from dimensions and material
DS/EN 1991-1-1 (densiteter/egenlast)
Oscillation period of a suspended load (pendulum)
Fysik — matematisk pendul (T = 2π√(L/g))
Dynamic load increase when accelerating/braking
DS/EN 13001-2 (dynamiske faktorer for krankonstruktioner)
Safety distance to overhead lines
BEK nr. 1112 af 18/08/2016 (afstande ved arbejde nær el-anlæg)
Tail swing (counterweight swing) — clearance behind the crane
Geometri (cirkelbue/sektor) + Arbejdstilsynets sikkerhedszoner ved svingende kran
Hoisting time at a given rope speed
Forholdsregning (t = s/v)
Reach and lifting height at boom angle
Geometri/trigonometri (retvinklet trekant)
Line pull with multi-part reeving (block and tackle)
Riggeriteknik — reeving-effektivitet (typisk friktionstab pr. skive)
Fall speed and energy of a dropped load
Fysik — frit fald (v = √(2gh), E = mgh)
Net load per load diagram
Crane load chart · Liebherr «Influence of wind» (lifted load = load + hook and rigging)
Permitted wind for a wind-sensitive load
EN 13000 (1.2 m²/t) · Liebherr «Influence of wind on crane operation»
Necessary lift height from heights
Construction drawing's elevations (DVR90) · crane's lifting height curve
Free height under anchorage when fall protection
EN 355 (fall arrester max 1.75 m) · fall protection's instructions
Tools that work in all subjects
Whatever your programme is called, these tools calculate the same — Pythagoras, area, percentages and units are not tied to one trade.
- Pythagorasa² + b² = c²Find the missing side, set out a right angle, check whether a room is square, and find the space diagonal.
- Area and perimeterm²Rectangle, triangle, trapezium, circle and composite shapes — area and perimeter.
- Volume and surface aream³ · lBox, cylinder, cone, sphere, pyramid, prism, pipe and frustum — also in litres.
- Percent%Percentage of, how many per cent, percentage change, discount and VAT.
- Scale and ratios1 : 50From drawing to reality, area and volume to scale, the rule of three and dividing in a ratio.
- Unit convertermm ↔ mFrom mm to km, Pa to bar and kB to GB — with the unit staircase.
- Time calculations and the clockt : minTime between two clock times, add time, and 1.75 h = 1 h 45 min for the timesheet.
- Slope and fall% · ° · 1:xFall from level to level, in per cent, per mille, degrees and mm per metre — and the height difference.
- Material consumption including wastem² + %Boards, paint, battens at c/c spacing and packs — for a composite surface or a whole room, with waste.