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
Lifting moment (tonne-metres)
Ren fysik: moment = kraft · arm
Sling load with angled pull
Ren geometri (måltal, ingen trig-konstanter)
Utilisation of WLL
Ren procentregning på egne tal
Load weight from dimensions and material
DS/EN 1991-1-1, anneks A (densiteter)
WLL from breaking load and safety factor
Standardernes sikkerhedsfaktorer (DS/EN 1492 · DS/EN 13414 · DS/EN 818)
Permitted load by slinging method
Belastningstabel (CERTEX Danmark; praksis efter DS/EN 818-4 / DS/EN 1492-1)
Tandem lift with two cranes
BEK 428/2022 § 55 (samløft kræver arbejdsprocedure) + statik
Load distribution with two lifting points
Ren statik: momentligevægt
Ground pressure under outriggers
Ren fysik: tryk = kraft / areal
Wind effect on the load
DS/EN 1991-1-4 (vindtryk) + EN 13000 (1,2 m² vindflade pr. ton)
Theoretical maximum load at outreach
Forholdsregning (TM = last · udlæg)
Parts of line: rope load and hook speed
Ren fysik: talje-princip (uden friktionstab)
Dynamic allowance at start and stop
Ren fysik: Newtons 2. lov (F = m·(g + a))
Angled pull: horizontal force in the wire rope
Ren statik: kraft-komposanter (kraner må som hovedregel kun belastes lodret)
Cycle time and lifts per hour
Forholdsregning (tid = vej / hastighed)
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»
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.