Work it out.
Calculators
Spindle speed (turning and milling)
Cutting data
Feed rate (milling)
Cutting data
Tap drill hole (pre-drilling) for metric threads
ISO metrisk gevind (DS/ISO 261)
Machining time in turning/milling
Maskinteknik (bearbejdningstid)
Chip thickness in turning
Skæregeometri (indstillingsvinkel κr)
Surface roughness (Ra) in turning
Overfladeruhed (skæredata-formel, fagteori.dk)
Cutting power (motor power) in turning
Kienzle-formel (skæreteknologi)
ISO tolerance band (IT grade)
ISO 286-1 (toleranceenhed og IT-grader)
Shrink fit — required heating for press fitting
Termisk udvidelse (materialekonstant α)
Pitch and minor diameter for metric threads
ISO 68-1 (metrisk gevindprofil)
Drilling time for through-holes
Boregeometri (spidsvinkel-tillæg)
Spring constant for a cylindrical compression spring
DS/EN 13906-1 (cylindriske trykfjedre)
Gear module and pitch diameter
Modulsystem (DIN 780/ISO 54, DIN 867/ISO 21771)
Weight of a workpiece (round bar) from density
Materialedatablade (densitet)
Torque wrench with extension — correct setting
Momentnøgle-forlænger (Norbar-formel)
Fit: largest and smallest clearance
ISO 286-1 and 286-2 (basic dimensions and fits)
Sine bar: end gauge stack for an angle
Sine gauge (h = L · sin α) with end measures per ISO 3650
Measurement error when part and measuring tool expand differently
ISO 1 (reference temperature 20 °C) + ISO 3650 (steel end measures: α = 11.5 · 10⁻⁶/K)
Bent bracket
Exact flat pattern
Flat plate, flange and blank
Exact flat pattern
Strip layout for a stamping die
Exact flat pattern
Five-pointed star
Exact flat pattern
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.