Free online calculators for material weight, cutting speed & feed rate, and drilling speed & feed. Engineered for CNC machinists, estimators, and procurement teams — no signup, no tracking, all math runs in your browser.
Calculate the theoretical weight of a raw stock or finished part from material grade, shape, and dimensions. Useful for quotation, shipping weight, and stock control.
Calculate recommended spindle speed, feed rate, material removal rate (MRR), and required spindle power for milling and turning operations.
Calculate recommended spindle speed and feed rate for drilling operations. Selects recommended cutting speed automatically based on material and drill type.
Calculate stock weight and rough machining time in seconds. Send the figures to our engineering team and receive a firm quote within 24 to 48 hours.
Densities and cutting speeds come from standard engineering references, not opinion. Use the figures as a starting point and refine with a test cut.
No installation, no account, no email gate. Open the page on a shop-floor tablet or your engineering workstation and start calculating.
Inputs in mm, m/min, mm/tooth, kW. All conversions match the units used in our shop travellers and Mazak Variaxis operator panels.
Mild steel, stainless 304/316, aluminum 6061 and 7075, brass C360, copper C110, titanium grade 5, tungsten carbide, ABS, PC, POM, PEEK, PTFE, PP, and acrylic.
Robocon CNC runs 14 CNC machines in Pune, including a Mazak Variaxis C600 5-axis. We use the same calculations in our own production every day.
Yes. All three calculators on this page are free, with no login or email required. They are provided by Robocon CNC, an ISO 9001:2015 certified precision machining company in Pune, India, to help engineers, designers, and machinists produce accurate quotations and machining parameters.
The material weight calculator uses standard published densities (g/cm³) for 14 common engineering materials. Accuracy is within approximately 2 to 5 percent of theoretical weight, which is sufficient for quotation, shipping, and stock control purposes. Actual part weight may vary slightly with alloy grade and surface finish.
Material weight: mild steel, stainless steel (304/316), aluminum 6061/7075, brass C360, copper C110, titanium grade 5, tungsten carbide, ABS, polycarbonate, POM (Delrin), PEEK, PTFE (Teflon), polypropylene, and acrylic. Cutting and drilling: aluminum, mild steel, tool steel, stainless steel, cast iron, brass, copper, and titanium.
Material weight: mass = volume × density, with volume derived from each shape (round bar V = π × r² × L; square bar V = a × b × L; plate V = L × W × T; sheet same as plate; tube V = π × (R² − r²) × L; ring V = π × (R² − r²) × h; hexagonal V = (3 × √3 / 2) × a² × L; angle V = thickness × (b + (h − t)) × length). Cutting speed: N = 1000 × Vc / (π × D); vf = N × fz × z. Drilling: same cutting-speed formula, with vf = N × fn.
These parameters are starting-point recommendations based on published cutting data. For production runs, especially in difficult-to-cut materials such as Inconel, titanium, or hardened tool steel, Robocon CNC recommends a test cut with the actual tool and fixture. Final parameters depend on machine rigidity, tool holder, coolant, and surface finish requirements.
Yes. Send your STEP or IGES file along with material grade, tolerances, surface finish, and required quantity to info@roboconcnc.com. Our engineers will validate the parameters and return a detailed quotation, typically within 24 to 48 hours.
All three calculators are designed for metric input (mm, mm/min, m/min, kW). To convert from inches, multiply inches by 25.4. To convert feet per minute (SFM) to m/min, multiply by 0.3048. We are working on a unit-toggle option for future release.
Standard machining tolerance is plus or minus 0.1 mm. Tight tolerance machining is plus or minus 0.025 mm, and ultra-precision tolerance is plus or minus 0.005 mm on critical features. Tolerances are verified on our Zeiss CMM and Hexagon Global S Green 7.10.7 CMMs and reported in PDF inspection reports per ISO 9001:2015, AS9100, and EN 10204 3.1.
Send your STEP or IGES file to info@roboconcnc.com and our engineers will validate the calculator outputs against your actual part geometry. ISO 9001:2015 certified. PPAP, FAI, and EN 10204 3.1 reports on request.