Cutting Speed Calculator
Calculate spindle RPM from cutting speed and tool diameter, or reverse the calculation to find surface speed from RPM. Supports SFM and m/min.
Open Calculator →Free Engineering Tools
Practical calculators for metal processing — material weight, stamping force, bending and deep drawing. Built by our engineers for engineers, procurement teams and hobbyists. No sign-up, works on any device.
Calculate spindle RPM from cutting speed and tool diameter, or reverse the calculation to find surface speed from RPM. Supports SFM and m/min.
Open Calculator →Calculate feed rate from spindle RPM and feed per tooth or feed per revolution for milling, turning and drilling, in metric or imperial units.
Open Calculator →Find common tap drill sizes for ISO metric coarse, UNC and UNF threads, with nominal diameter, pitch and both millimetre and inch drill sizes.
Open Calculator →Estimate theoretical turning or boring roughness Ra from feed per revolution and tool nose radius, with results in micrometres and microinches.
Open Calculator →Estimate air-bending force from sheet thickness, bend length, V-die opening and tensile strength. Results include kN, metric tons and US short tons.
Open Calculator →Size a press from a known working force, a blanking estimate or hydraulic cylinder pressure, with unit conversion and capacity allowance.
Open Calculator →Calculate the gross weight of steel, aluminum, stainless steel, copper, brass and other metals for plates, sheets, round/square bars and tubes. Enter dimensions and quantity to get total weight, weight per meter and per foot.
Open Calculator →Estimate the press tonnage required for blanking, piercing and stamping operations from material thickness, shear strength and cut length.
Open Calculator →Calculate bend deduction, bend allowance, outside setback and flat blank length from thickness, radius, angle and K-factor in metric or imperial units.
Open Calculator →Compare inside bend radius with typical material-specific R/t ranges, outside radius and a suggested V-die reference.
Open Calculator →Reverse-calculate the sheet-metal K-factor from a measured flat blank and formed flanges, or use a known K-factor to predict flat length.
Open Calculator →Compute the flat pattern length of bent sheet metal parts using bend allowance, bend deduction and K-factor for air bending and bottoming. Supports L and U shapes plus K-factor reverse calculation.
Open Calculator →Calculate the developed length of round and square tube after bending with centerline radius and bend angle inputs. Supports multi-bend sequences, material K-factors, minimum radius and thin-wall warnings.
Open Calculator →Compute the drawing ratio (drawing coefficient) m = d/D, punch force F = π·C₁·d·t·σs with the C₁ table, and recommended die & punch radius (r-angle) setting for cylindrical deep drawn parts.
Open Calculator →Predict springback angle, the press-brake overbend setpoint and final radius using the ASM springback ratio Ks = 4x³ − 3x + 1, based on material, thickness and bend radius.
Open Calculator →These tools cover the calculations used when reviewing press force, machining settings, bending and deep drawing. Each page states the formula and assumptions so you can check a process or prepare a clearer question before a quotation review.
Yes — every calculator on this page is free, with no sign-up, no email required and no usage limits. We keep them as a practical resource for engineers and buyers working with metal parts.
Gross weight is the weight of the raw material before machining or fabrication — the stock you actually order and cut. Net weight subtracts holes, cutouts and machined features. For quoting and shipping, always start from the gross weight and add a small scrap allowance.
Every dimension input accepts mm, cm, m and inches, and results are shown in both kilograms and pounds. Just pick the unit next to each field and the calculator converts everything for you.
They are an excellent first estimate. For a final production quote, send your drawing to Balford at shawn@balford.net — our engineers will confirm material, tolerances and price within 24 hours.