Gesello Downloads & RevenueGesello – Metalwork Handbook · App Store

The technical handbook that does the maths. Fit, thread, spindle speed or hardening temperature: enter a value – Gesello calculates your case with a sketch to scale and the calculation steps. Offline, no account, no ads. Metric, based on ISO.

WHY GESELLO?
- Calculated, not just looked up: ISO fits and threads come from formulas, not tables – for every nominal size and every pitch.
- Every result with sketch, formula and calculation steps – ideal for learning and for checking.
- Share with one tap: a clear text with a link that opens Gesello exactly where you were.
- Made for machinists, toolmakers, fitters, metalworkers, mechatronics technicians and all technical trades – in training, at technical college and in the workshop.

INCLUDED FOR FREE
- ISO tolerances and fits: limits of size, clearance, interference, transition fits, hole-basis and shaft-basis systems
- General tolerances for linear sizes, angles, radii and chamfers
- Geometrical tolerances with explanation and inspection guide
- Threads: coarse, fine, inch and special threads, tap drill, blind hole depth, thread turning with infeed per pass, thread milling
- Screws: tightening torque and preload by property class (8.8, 10.9, 12.9), engagement length, strap clamps
- Cutting data for drilling, reaming, turning, milling and grinding: spindle speed, feed, cutting speed, machining time, milling path, cutting force and power – with the speed steps of your own machine
- Surfaces: convert Rz to Ra, theoretical roughness for turning and milling
- Weight calculator for round, square, hexagon, tube, flat and sections – also straight from the stock designation
- Widths across flats, technical mathematics, triangles, unit conversion
- CNC (DIN/PAL): all G and M codes for turning and milling with sketches, face milling helper with a ready NC program
- Drawing symbols, workpiece edges and threads in technical drawings, with typical mistakes
- Standard parts: parallel keys, retaining rings and O-rings with groove dimensions
- Taper turning: compound slide angle, Morse and steep tapers, tailstock offset
- Practice: exercises with worked solutions, from the vernier caliper to fits

GESELLO PRO – BUY ONCE, NO SUBSCRIPTION
- Measuring & inspection: read calipers and micrometers, choose gauges, inspection plan, statistics, gauge block combinations
- Materials: decode steel names and material numbers, cast iron, aluminium, copper, plastics, properties
- Heat treatment: hardening temperature from the steel name, iron-carbon diagram, annealing, hardening, quenching and tempering, case hardening, nitriding, temper colours
- Convert hardness: HRC, HV, HB and tensile strength
- Grinding wheels: read the designation, maximum speed, check flanges, mount safely
- Control engineering: pneumatic and hydraulic symbols, directional valve builder, logic with truth table, displacement-step diagram, GRAFCET, electropneumatics, timers
- Hydraulics and pneumatics: piston force, air consumption, press, lines
- Production p