What’s on the Speed & Feed poster
The rule, 3 worked examples, and the mistake everyone makes.
- Cutting speed is the surface speed at the tool tip, and the material pair sets it, no…
- Vc = π D N ÷ 1000 m/min · feed = fz × teeth × N
- D = 50 mm, N = 1000 rpm = Vc about 157 m/min
- Vc = 120, D = 20 mm = N about 1910 rpm
- 4 flutes, fz = 0.05 = 0.2 mm per rev
- Common mistake: Holding rpm constant across diameters → Hold surface speed constant
D is the cutting diameter: the tool in milling, the workpiece in turning. Tool maker data governs.
Questions about the Speed & Feed poster
- What’s on the Speed & Feed poster?
- The rule, 3 worked examples, and the mistake everyone makes. Cutting speed is the surface speed at the tool tip, and the material pair sets it, no…; Vc = π D N ÷ 1000 m/min · feed = fz × teeth × N; D = 50 mm, N = 1000 rpm = Vc about 157 m/min; Vc = 120, D = 20 mm = N about 1910 rpm; 4 flutes, fz = 0.05 = 0.2 mm per rev; Common mistake: Holding rpm constant across diameters → Hold surface speed constant. D is the cutting diameter: the tool in milling, the workpiece in turning. Tool maker data governs.
- Who is the Speed & Feed poster for?
- Speed & Feed belongs to the Mechanical Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning manufacturing can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Speed & Feed poster?
- Setting up any machining operation, or reading a tool maker's data sheet. A wall chart earns its place by being glanceable from where the work is happening, so Speed & Feed belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
- What other posters go with Speed & Feed?
- Additive Processes, Casting Processes and Design for Manufacture sit alongside Speed & Feed in the Mechanical Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Additive ProcessesCasting ProcessesDesign for Manufacture
- Is the Speed & Feed poster free to download and print?
- Yes. Speed & Feed downloads as a free PDF with no account, no email and no watermark, like everything else in the Mechanical Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the Speed & Feed poster print at?
- Speed & Feed is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Speed & Feed loses nothing.Printing guide
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