Why Cutting Parameters Decide Everything

Two saws, the same bar, two completely different results. One finishes a clean, burr-free cut in seconds with a blade that lasts for weeks. The other burns the blade, smears the surface and stalls the cell. The difference is almost never the machine — it is the cutting speed and feed matched to the material.

This guide gives you a working sawing parameter table for the five material families KEENSAW customers cut most: carbon & low-alloy steel, stainless, alloy & tool steel, titanium / hardened alloys, and aluminium / non-ferrous. Every number below is a starting point — dial it in using the “reading the cut” checklist in section 8. Pair the values with the right KEENSAW circular saw o band saw and you get repeatable output from day one.

The Four Levers You Actually Control

Before the tables, lock down the four inputs that determine blade life and cut quality:

For band saws the control variable is blade speed (m/min) y feed per tooth. For circular saws it is spindle RPM and feed rate (mm/s). On a KEENSAW BSVP530 both are set on the HMI; start from the table and tune by feel.

Carbon & Low-Alloy Steel (The Easy One)

Mild steel, 1018, 1045, low-alloy up to ~35 HRC. This is the forgiving material — wide speed window, standard bi-metal blades. Push volume here with a carbide circular saw if sections are small.

Stainless Steel (304 / 316 / 17-4PH)

Stainless is the #1 source of “why is my blade dying” calls — and the answer is almost always work-hardening. 304/316 have high work-hardening rates: if the feed is too light, the teeth rub instead of cutting, the surface hardens, and the next tooth hits armour plate. Go slower on speed, heavier on feed, coarser pitch, and flood with coolant.

Rule of thumb for a band saw cutting speed for stainless steel: start at 50 m/min for austenitic 304/316, drop to 35–40 for precipitation-hardened grades. See our cost-per-cut model for how blade choice shifts the economics.

Alloy & Tool Steel (4140, 4340, H13, D2)

Harder and more abrasive than carbon steel. 4140/4340 cut like a tougher carbon steel; H13 and D2 (die steels) need the slow, coolant-rich treatment or you will eat blades. A hardened coarse-pitch bi-metal with controlled feed is the default.

Titanium & Hardened Alloys

Titanium (Grade 5 / Ti-6Al-4V) cuts cleanly but holds heat at the tip — low thermal conductivity means the tooth, not the chip, gets hot. Combine that with titanium’s combustibility as fine powder, and the rules are: moderate speed, generous feed (don’t rub), flood coolant, never let it glow. For feed rate for titanium sawing, think “positive, continuous chip, no sparks.”

If you see blue sparks at the kerf, you are too fast or too dry — back off immediately. The forging billet guide covers heavier sections that often pair with titanium in aerospace cells.

Aluminium & Non-Ferrous

Aluminium wants to be cut fast — high speed, fast feed, and a blade with enough gullet to clear the big gummy chips. The risk is built-up edge and clogging, not heat. Use a dedicated non-ferrous blade (high tooth count, zero/negative rake) and you can run a carbide circular saw at very high rates.

Reading the Cut: How to Tune by Feel

Numbers get you close; the cut surface tells you the truth. Use this checklist on the first bar of every new job:

• Curl-shaped chips, light sound → you are in the window. Lock it in.
• Powdery dust / glowing kerf → too fast or dry. Drop speed 15–20%, increase coolant.
• Shiny hardened band on the cut face → work-hardening from too-light feed. Increase feed per tooth.
• Chipped / missing teeth → feed too heavy or pitch too fine for the section. Reduce feed, coarsen pitch.
• Long stringy burr → blade worn or speed slightly high. See our notas de rebabas y costos.

A 30-Second Selection Workflow

1. Identifique la familia de materiales en las tablas anteriores.
2. Tipo de hoja de selección: M42 para aceros comunes, M51 para troquelado/endurecido, PVD TCT para acero inoxidable y titanio, hoja no ferrosa para aluminio.
3. Set speed from the table; start at the low end, ramp up only if chips stay curly.
4. Set feed per tooth so at least 2–3 teeth engage; never let the blade rub.
5. Flood coolant, then validate with the chip-shape checklist.

Preguntas frecuentes

What surface speed should a band saw run for stainless steel?

Comience a 40–60 m/min para 304/316 y baje a 30–45 m/min para 17-4PH endurecido por precipitación. El mayor error es utilizar el acero inoxidable demasiado rápido, lo que quema los dientes. Combínelo con una cuchilla M42 gruesa de 1,4–2 TPI y un líquido refrigerante.

How do I calculate feed rate per tooth for a band saw?

Avance por diente = (avance de la mesa mm/min) ÷ (velocidad de la hoja m/min × 1000 × dientes por mm). Más simple: elija el valor mm/diente de la tabla, luego ajuste el avance de la máquina de modo que siempre haya 2 o 3 dientes en el corte. Una alimentación demasiado ligera provoca endurecimiento por trabajo; demasiado pesado chasquea los dientes.

Why does stainless steel work-harden when sawing?

El acero inoxidable austenítico tiene una alta tasa de endurecimiento por trabajo. Si la alimentación es demasiado ligera, los dientes se frotan en lugar de cortarse, endureciendo plásticamente la superficie. El siguiente diente se encuentra entonces con el material endurecido. Mantenga el avance positivo y la velocidad moderada para evitarlo.

What blade is best for cutting titanium?

A coarse-pitch M42 bi-metal band saw blade (1.4–2 TPI) or a sharp-geometry PVD-coated TCT circular blade, run at 25–45 m/min with generous flood coolant. Never let the kerf glow — titanium heat builds at the tooth, not the chip.

Do I need coolant for aluminium sawing?

Usually not for heat — aluminium dissipates well — but a light mist or wax lube prevents built-up edge and clears gummy chips at high feed. Dry cutting is fine on a dedicated non-ferrous blade at moderate rates.

How do I know the feed is too fast?

Signs: chipped or missing teeth, loud cracking, long stringy burr, and a rough cut face. Back the feed off 15–20% and confirm chips return to tight curls.

Conclusion & Next Step

Las tablas anteriores son la forma más rápida de dejar de quemar espadas y comenzar a alcanzar las especificaciones. Haga coincidir el material → hoja → velocidad → avance, luego ajuste según la forma de la viruta. Para conocer el costo de la misma decisión, lea nuestra circular saw vs band saw TCO model y el Guía de línea de aserrado para automoción y forja..