Learn practical CNC machining
Shop math, G-code, setup decisions, threading, inspection and safe prove-out.
Constant Surface Speed vs Fixed RPM: Lathe Examples
See how changing diameter affects spindle RPM and cutting speed, with worked inch and metric examples and a practical explanation of RPM caps.Lathe Cycle Time Formula: Cutting, Setup and Batch Examples
Estimate lathe cutting time from feed travel, RPM and feed per revolution, then add roughing passes, setup and insert changes with a worked 25-part…Radial Chip Thinning Formula: Calculate Adjusted Feed
Calculate radial chip thinning at light engagement, adjust feed per tooth, and check a half-inch end mill example. Learn when compensation is already included.Drill Point Length Formula: 118° vs 135° Depth Examples
Calculate drill point length for 118° and 135° drills. Worked inch and metric examples explain full-diameter blind-hole depth, tip allowance and common mistakes.CNMG 120408 Meaning: Insert Code Explained + CNMG 432
Decode CNMG 120408 one symbol at a time. Check the 12.7 mm inscribed circle, thickness, nose radius and CNMG 432 equivalent before choosing a…
Lathe Taper Length: Calculate Z from Major and Minor X Diameters
Calculate the Z length of a straight lathe taper from major and minor X diameters. Includes inch and metric examples, formulas, and half-angle versus…Turning Insert Setup Checklist: Holder, Radius and Chipbreaker
A turning insert setup checklist helps turn a catalogue selection into a clear instruction at the CNC lathe. Use it before ordering replacement inserts…Choose a Turning Insert Grade by Workpiece Material
Choosing turning insert grades by material begins with the drawing and stock specification. A shop description such as “stainless” or “aluminium” is useful conversation,…CNMG vs DNMG vs VNMG: Which Turning Insert Shape?
CNMG vs DNMG vs VNMG is a comparison of turning insert shapes: 80°, 55° and 35° diamonds. Start by separating the shape from the…
CNC Speeds and Feeds: Calculate RPM and Feed Rate
A useful CNC speeds and feeds calculation starts with three decisions: which diameter is actually cutting, how the feed value is defined, and which…
New guide: speeds and feeds, explained
Understand cutting speed versus RPM, chip load versus feed per revolution, and what to change when spindle speed is capped. Work through a milling example, then try the linked calculators.