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 planning: process plans for turned parts, milled parts, hole patterns and assembly with cutting data and times, reorder steps by dragging, share as PDF; manufacturing cost per part and batch
• Indexable inserts: decode designations, recognise wear, troubleshooting for chatter or rough surfaces
• Bolt circles, hole rows and dividing head, counterbores and centre holes
• Bending: blank length, bend deduction, minimum bend radius, tubes, sections, rolling, flat patterns, shearing, press brake
• Tolerance stacks, welding, drives, coolant
• CNC cycles with input mask and a ready NC block
• Scientific calculator on every page, with real fractions
YOUR DATA STAYS WITH YOU
No account, no ads, no tracking. Gesello calculates directly on the device and works without internet – on the shop floor just as well as in the basement of the training centre.
Questions or ideas? Write to dev@gesello.app – Gesello is constantly being extended.
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