If there is too much heat, and temperatures rise too high, the cutting tool can no longer resist. Things can get quite hot before trouble starts, and that’s perfectly okay. the faster the cutting speed), the more heat it generates.Ĭutting tools are made of materials that are designed to resist heat.
The faster you move the cutting edge through the material it’s cutting (i.e. Well, the diagram does mention the notion of rubbing two blocks to start a fire. What’s the impact of too much surface speed or too much cutting speed? What’s the Right Surface Speed (What Happens When it is Wrong?) Now, each specific cutting tool will have a different surface speed for each specific material. The metric measure of surface speed can be either meters or millimeters per minute (or second), but it’s the exact same concept.
Pretty easy, right? And now you can see why you might have a unit like SFM: the cutter will move that number of feet in one minute. Surface speed is simply the speed the cutter moves across the workpiece.
All they know is they are slicing into the workpiece, like dragging a razor over your skin when you shave. They don’t know if there are other cutting edges either. Those cutting edges don’t know whether they’re on a lathe or a mill. Sounds like a tall order, but it’s really pretty simple. The goal of surface speed is to provide a single quantity that can help determine the best cutting speed (spindle rpm) for every cutter type, no matter whether it’s on a lathe or mill and no matter what diameter is involved. On top of that the tool diameter (for mills) and workpiece diameter (on lathes) matter. Not only that, but there are usually multiple cutting edges or flutes on a typical endmill. On a milling machine, the cutter spins and the work remains stationary. Typically, there is only one cutting edge. On a lathe, the work spins and the cutter remains stationary. Here’s the thing–cutters come in many variants. We also sometimes refer to Surface Speed as Cutting Speed. Surface Speed and SFM are used to help determine the best spindle speed (measured in RPM or Revolutions per Minute) for machining cuts. Now why is that important? What is Surface Speed? We can also choose inches per minute.Īnd there is a specific SFM for every tool and material combination. We use Surface Meters per Minute in metric. It’s a unit of measurement for a concept in machining called “Surface Speed.” Of course there are also metric units for Surface Speed. Let’s get one thing out of the way quickly, SFM is an acronym for “Surface Feet per Minute”. In this article I’ll explain this useful concept. You don’t have to be fooling around with machining or CNC long to come across the abbreviation “SFM” and not long after you’ll see converting SFM to RPM is a standard part of Feeds and Speeds calculations. How can we convert SFM to RPM? What is SFM?
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