Rivet layout
Calculator · Rivet layoutRivet Edge Distance CalculatorRivet edge distance calculator: minimum 2D, 2.5D countersunk, maximum 4D. Sourced to AC 43.13-1B and the FAA Airframe Handbook. Check a drilled hole.Calculator · Rivet layoutRivet Spacing & Pitch CalculatorRivet pitch calculator: minimum 3D, typical 4D-6D, transverse pitch 75%. Enter a seam length and get the rivet count and actual pitch, in inches and mm.
Rivet selection
Calculator · Rivet selectionRivet Length CalculatorSolid rivet length calculator: grip + 1.5D, rounded up to the next 1/16 inch, with the full AN dash-number callout and the shop head you should be forming.Calculator · Rivet selectionSplice Rivet Calculator: How Many RivetsRivet count for a splice or doubler from AC 43.13-1B Tables 4-9 to 4-11: rivets per inch of width, the joint reductions, and whether bearing or shear governs.Calculator · Rivet selectionCountersink or Dimple?Countersink or dimple: the depth an MS20426 head needs against the 2/3 sheet and 0.020 in shank limits in the FAA Airframe Handbook, drawn in section.Calculator · Rivet selectionMicrostop Countersink Cage SettingSet a microstop countersink cage from a test hole: measure the countersink diameter, get the depth change for a flush MS20426 head and the clicks to turn.Calculator · Rivet selectionCherryMAX Grip SelectorPick the CherryMAX grip number for a measured stack: CR3213 or CR3212, diameter and maximum grip in 1/16 in, with a warning near a range limit.Calculator · Rivet selectionRivet Alloy & Icebox CheckIdentify a rivet's alloy from its head marking and AN code, and whether it must be kept refrigerated before driving, per AC 43.13-1B Table 4-8 and 4-57d.Calculator · Rivet selectionPart Number DecoderDecode rivet, CherryMAX, AN bolt and MS nutplate numbers and sheet specs: what each digit means, the size in inches and mm, and the documented crosses.
Inspection & repair
Calculator · Rivet inspectionRivet Shop Head InspectionCheck a driven rivet's shop head against the FAA Handbook's minimum, preferred and maximum and the AC 43.13-1B 1.5D minimum, and fix each defect.Calculator · Corrosion reworkCorrosion Blend-Out CalculatorCorrosion blend-out geometry from AC 43.13-1B: a dish-out 20 times the depth long and 10 times wide, and the thickness removed — against your SRM's limit.Calculator · Inspection & repairRivet Replacement in an Enlarged HoleRivet in an enlarged or damaged hole: the next size and drill per AC 43.13-1B par. 4-57b, checked against 2D edge distance, 3D pitch and the 2117 rule.Calculator · Inspection & repairRivet Inspection GuideAccept or replace: driven-rivet defects with cause and remedy from the FAA Airframe Handbook and AC 43.13-1B, and the signs of loose or working rivets.Calculator · Inspection & repairGalvanic Corrosion CheckerCheck two metals in contact against FAA AC 43-4B: same or different group, which one corrodes and how far apart they sit on the galvanic series.
Sheet metal
Calculator · FormingBend Allowance & Flat Pattern CalculatorFlat pattern for a part with several bends: setback, bend allowance and deduction, total developed width, and where each sight line goes, per the FAA Handbook.Calculator · Sheet stockAluminum Sheet Weight CalculatorAluminum sheet weight per square foot and per piece, from MIL-HDBK-5 densities, and the moment a doubler adds — checked against AC 43.13-1B's negligible change.Calculator · Sheet metalBlanks per SheetHow many rectangular blanks fit on a 4 × 8, 4 × 10 or 4 × 12 ft sheet, or a metric one, with kerf and grain: sheets to buy and offcut, laid out to scale.Calculator · Sheet metalJoggle Allowance CalculatorJoggle depth, allowance and length for a sheet metal part: depth from the thickness to clear, 4 × depth allowance for flat sheet, plus 1/16 in on the length.
Fasteners & torque
Calculator · FastenersTorque Wrench Extension CalculatorTorque wrench setting with a crowfoot or adapter: Y = T × L / (L ± E) from AC 43.13-1B Figure 7-2, plus any angle in between, drawn to scale.Calculator · FastenersBolt Grip Length & Washer CalculatorCheck a bolt's grip length against the parts it holds and the washers needed to make it up, against the 1/8 in combined limit in AC 43.13-1B par. 7-37.Calculator · FastenersSafety Wire Size & TwistsSafety wire diameter for the hole and the spacing, double-twist or single-wire, and the 6 to 8 twists per inch from AC 43.13-1B par. 7-123 and Figure 7-3a.Calculator · FastenersAN Bolt Hole Drill SizeDrill for an AN bolt hole: the first letter drill above the bolt per AC 43.13-1B par. 7-39, when it applies, and when the hole must be reamed instead.Calculator · FastenersCherry Pulling Head SelectorWhich Cherry pulling head installs your blind rivet on your riveter, straight, right angle or offset, with the adapter: CherryMAX, CherryLOCK, MaxiBolt.
Composites
Calculator · CompositesScarf Repair Ply CalculatorScarf repair geometry for composite laminates: taper length from the ratio or overlap per ply, and the diameter of every repair ply, drawn in section.Calculator · CompositesLaminate Plies & ResinPlies for a cured laminate thickness, dry fabric weight and the resin to mix for a fibre-to-resin ratio, with the FAA Airframe Handbook's 60:40 optimum flagged.Calculator · CompositesCure Cycle PlannerPlan an elevated-temperature cure: ramp, hold and cool-down times, the finish time and the profile to scale, checked against the FAA Airframe Handbook.Calculator · CompositesVacuum Bag Pressure at AltitudeHow much vacuum a composite repair bag can reach at your shop's elevation, against the 22 inHg the FAA Airframe Handbook shows. Drawn on a gauge.Calculator · CompositesPrepreg Out-Time LogLog every period a prepreg roll or kit spends out of the freezer and see the out-life left against the mechanical life on the data sheet, with a warning.Calculator · CompositesCore Potting VolumePotting compound for a honeycomb core repair: cutout plus undercut cavity and overfill, with AC 43.13-1B's 1 inch limit for potting instead of a core plug.
Finishing
Calculator · FinishingDew Point & Application MarginDew point and surface margin before you prime, seal or lay up epoxy: WMO formula, the 3 °C (5 °F) margin, and a clear go or no-go for the surface.Calculator · FinishingWet & Dry Film ThicknessWet film to dry film thickness from volume solids, theoretical coverage per litre or gallon, and the paint a job needs. Metric or US units, drawn to scale.Calculator · FinishingTwo-Part Mix Ratio CalculatorBatch a two- or three-part product by volume or weight: base, activator and reducer from the ratio, for a total, the base on hand, or an area at a wet film.Calculator · FinishingSealant Fillet & CartridgesHow much sealant a fillet seam takes and how many cartridges to mix: bead section times seam length, with waste, drawn in section. Inches or millimetres.Calculator · FinishingPot Life TimerA pot life timer for mixed sealant, resin or adhesive: time left and the time to discard, from the pot life on the data sheet. Updates live on the bench.
Workshop
Calculator · WorkshopAviation Unit ConverterConvert the units a hangar mixes: lb-in to N·m, psi to bar, inHg to kPa, gallons to litres, inches to mm, °F to °C. Exact factors, two aligned scales.Calculator · WorkshopDilution CalculatorDilute a cleaner, conversion coating or concentrate: C1·V1 = C2·V2 or a 1 : n ratio, with the concentrate and water to measure, drawn in the container.Calculator · WorkshopKit Weight & CountRivets are bought by the pound and used by the piece. Turn weight into pieces and back, add sheet, fabric and consumables, and total a trip kit in kg and lb.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.