Engineering tools
Machining calculators and engineering tools.
Twenty-two working tools for the numbers engineers and machinists look up most: speeds and feeds, threads and fasteners, tolerances and inspection, materials, sheet metal, and job planning. Planning estimates include model limits; verify critical results against your specifications. Free, no sign-up.
Cutting
Speed & Feed Calculator
SFM, RPM and feed rate (IPM / IPT) from material, tool diameter, flutes and tool material.
Open tool →Material Removal Rate (MRR)
Removal rate for milling and turning from depth of cut, width of cut and feed — for cycle-time and tool-load checks.
Open tool →Cycle Time Estimator
Rough machining cycle time from envelope volume, removal rate, feature complexity and setup time.
Open tool →Stock Allowance
Raw-stock allowance per side for finishing and dimensional stability, from envelope, material and process.
Open tool →Coolant Ratio / Mix
Concentrate and water volumes for any sump size and target concentration — fills, top-offs and mix checks.
Open tool →Fasteners & threads
Tap Drill Calculator & Lookup
Tap drill size, major diameter and pitch for UNC, UNF, metric coarse and metric fine threads.
Open tool →Thread Engagement Length
Minimum tapped-hole engagement so the internal thread doesn't strip before the bolt fails, by size and grade.
Open tool →Bolt Torque Calculator
Recommended torque for SAE Grade 2/5/8, ISO 8.8/10.9/12.9 and stainless fasteners — dry, lubricated or anti-seize.
Open tool →Press-Fit / Interference Fit
Contact pressure, holding force, torque capacity, hub stress and shrink-fit ΔT from diametral interference.
Open tool →Tolerances & inspection
True Position with MMC Bonus
Position deviation (2 × √(Δx² + Δy²)) and MMC bonus tolerance for hole patterns per ASME Y14.5.
Open tool →Tolerance Stack-Up
Tolerance accumulation across stacked dimensions — worst-case (arithmetic) and statistical (RSS).
Open tool →Surface Finish Converter
Convert Ra ↔ Rz ↔ RMS ↔ CLA, with process attainability ranges for milling, turning, grinding and lapping.
Open tool →Thermal Expansion Stack
Dimensional change across temperature for multi-material assemblies (ΔL = L₀ × CTE × ΔT), 25-alloy library.
Open tool →Materials & heat treat
Material Weight Calculator
Part weight in lb and kg from box, cylinder or pipe dimensions for common machining alloys.
Open tool →Case Hardening Depth
Source-based gas-carburizing estimates and measured hardness-depth interpolation with explicit model limits.
Open tool →Cooling Channel Pressure Drop
Pressure drop across a machined cooling channel from geometry, flow rate and fluid — psi and bar.
Open tool →Design & inspection tools
Material Selector
Tell it what the part needs to do (strength, weight, temperature, corrosion, budget) and see which common machining alloys fit.
Open tool →DFM Checklist
Walk a print through the design-for-manufacturability checks that most often change cost and lead time before it goes out for quote.
Open tool →GD&T Symbol Quiz
Twelve-question drill on ASME Y14.5 symbols, zones, and datums. Instant feedback with the reasoning behind each answer.
Open tool →Looking for something else?
Background reading lives in our materials guide,tolerances & GD&T guide, andDFM tips.
Have a part that needs to be made right?
Tell us about your part and we'll get back to you promptly. Aerospace, medical, defense, and semiconductor production work welcome.Email CAD models and drawings to sales@digitalmachine.com, including ITAR, EAR, CUI and AS9100 work. Keep controlled technical data out of web forms.
First articles through full production runs