Gesello – Metalwork Handbook

Clemens Riemer

In-app purchases

About this app

The technical handbook that does the maths. Fit, thread, spindle speed or hardening temperature: enter a value – Gesello calculates your case with a scale sketch and calculation steps. Metric, based on ISO.

WHY GESELLO?
• Calculated, not just looked up: ISO fits and threads from formulas – for every nominal size and every pitch.
• Every result with sketch, formula and calculation steps – ideal for learning and checking.
• Share with one tap: text with a link that opens Gesello right there.
• Made for metalworking, mechatronics and all technical trades – in training, at college and in the workshop.

INCLUDED FOR FREE
• ISO tolerances and fits: limits of size, clearance, interference, transition fits, hole and shaft basis
• General tolerances for lengths, 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, set up right- or left-hand threads, UNJ, ACME, NPT
• Screws: tightening torque and preload by property class 8.8 to 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, chip thickness (chip thinning), ball nose end mills, deflection – with the speed steps of your machine
• Surfaces: convert Rz to Ra, theoretical roughness for turning and milling
• Weights for round, square, hexagon, tube, flat and sections – also from the stock designation
• Widths across flats, technical maths, 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
• Technical drawing: symbols, workpiece edges, threads, 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
• Sawing: tooth pitch with traffic light, cutting time for band, circular and hacksaws, blade length
• Knurling: blank Ø for pre-turning, all knurl types with pattern
• My library: own cutting data, materials and notes, only on the device (10 entries free, unlimited with Pro)
• Practice: exercises with worked solutions, from 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 designations, 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 and milled parts, hole patterns and assembly with cutting data and times, share as PDF; manufacturing cost per part and batch
• Indexable inserts: decode designations, recognise wear, troubleshooting (chatter, 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 ready NC block
• Scientific calculator on every page, with real fractions

YOUR DATA STAYS WITH YOU
No account, no ads, no tracking. Gesello calculates on the device, even without internet.

Questions or ideas? Write to [e-mail].

What’s new

Now also in Arabic. New: exam pack for CNC machinists with simulation, grade and analysis (buy once). New modules Sawing, Knurling and My library for your own cutting data, materials and notes. Threads: set up right-hand or left-hand threads, UNJ, ACME, NPT. Understanding indexable inserts with test questions. Cutting data: chip thickness, ball nose end mill, deflection. Grinding wheel step by step.