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Explore the role of end mill components in machining various materials with our guide on selecting the right features based on ISO 513 classifications, enhancing machining efficiency and tool life.  The components of an end mill play a crucial role in determining its performance and suitability for machining different materials. The best way to understand the importance of different features of an end mill is start with the material you are cutting. Just like a butter knife is not good for cutting steak, selecting features for an end mill is very dependent upon the material you're cutting. Let's start with some background information. The ISO 513 is a standard that classifies materials based on their machinability and provides guidelines for cutting speeds, feeds, and tool selection. ISO 513 provides a classification system for the machinability of materials, organizing them into categories based on the characteristics which influence their behavior during machining processes. The main categories include:
Now, let's dig into the details. Below you'll find the key components of an end mill and how they relate to machining different ISO 513 material types:
End Mill Anatomy Overview The anatomy of an end mill refers to its various components and features, each of which plays a critical role in its cutting performance. End mills are rotary cutting tools used in milling operations to remove material from a workpiece.
Here's a breakdown of the key parts of an end mill:
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edited by Bernard Martin Lexington Cutter has a put together a short checklist of the five most common problems for addressing reaming problems. If these don't fix your particular problem, get in contact with us and we'll send one of our application specialist in to give you a hand.  1) Poor Finish Possible Causes – Unequal chamfers, Incorrect margins, Excessive spindle runout, Chatter Possible Solutions – Regrind reamer with equal chamfer angle. Regrind reamer with narrow margins for reaming lower tensile materials. Increase reamer back taper (will lose size faster). Reduce speed and increase feed rate. Use power feed unless material is hard. Use right or left spiral fluted reamer. Grind secondary lead angle immediately back of 45° chamfer. 2) Oversize Hole - Taper Hole - Bell Mouth Hole - Poor Finish Possible Causes – Misalignment, Insufficient, cutting action Possible Solutions – Use bushing – .0002″/.0003″ over reamer diameter. If hole location varies, use floating reamer holder. Increase reamer back taper (will lose size faster). Specify reamer with positive radial rake to reduce cutting pressure – may produce slightly larger diameter holes. 3) Excessive Tool Wear Possible Causes – Insufficient stock for removal, Excessive reaming pressure, Misalignment Possible Solutions – Decrease previous operation drill size to allow more material for removal by reamer – leave about 3% of hole diameter for cast iron and more stock for non-ferrous materials. Increase feed rate. Reduce stock to be removed by increasing previous operation drill size – leave about 3% of the hole diameter. See Problem #2 4) Crooked Holes Possible Causes – Not drilled straight Possible Solutions – Correct previous drilling operation – reamer will follow the drilled hole. Increase reamer attack angle (chamfer) to 120°/180° included angle. 5) Tool Breakage
Possible Causes – Excessive reaming pressure, Misalignment Possible Solutions – Reduce stock to be removed – See Problem #3 – See Problem #2 compiled & edited by Bernard Martin  As more and more of our customers are using Martindale Gaylee Circular saws we put together this guide to the commonly asked questions such as "Is there a rule-of-thumb for the number of teeth?" or "How much side clearance should I have?" Here we cover a lot of the fundamentals of selecting the right circular saw blade configuration, some tips, tricks, and troubleshooting for when things go wrong. Circular Saw Feed Rates These are general cutting speed recommendations for circular saws used in metalcutting from Martindale/Gaylee. The may vary from application to application but are basically some general suggestions starting parameters when using high speed or carbide saws.
Selecting the Proper Number of Teeth in Your Metalcutting Saw Generally speaking, deep cuts and soft material require fewer teeth for chip clearance and stronger teeth (landed) Thin material requires more teeth, but keep-in-mind that at least 2 teeth on the blade need to be engaged in cut.
Rake Angles and Side Clearance AnglesSIDE CLEARANCE (Tangential Clearance Angle) This is also known as dish or hollow grind. You measure down the side of the tip and the difference it is the difference between front and back. As you cut, material it gets compressed and springs back after the cutting edge passes. A steep side clearance angle gives plenty of room for the material to expand and prevents thermal expansion of the base material. Keep in mint that a very flat side clearance angle can provide a smoother cut in some materials. For stainless steel and tenacious metals such as copper, zinc, tin or lead an increase in the side clearance is desirable as these materials tend to "spring back" (thermal expansion) on the blade. RAKE ANGLES Rake angle is the term used to describe the direction of the blade’s teeth, as referenced from the rotation and central axis of a saw blade. If you imagine a line going from the exact center of the blade to each tooth, having the front of the tooth directly on that line would be a zero degree rake angle. The rake angle of the blade is described in comparison to that imaginary line. A positive rake angle meana that the teeth are angled more towards the angle of rotation, while a negative rake angle would mean that they are angled backwards, away from the direction of rotation. Generally speaking, the preferred rake angle is:
 Why do Circular Saw Blades Break? It's commonly known that when saw thickness is less than 0.125″, keyways can cause stress risers and cracks. That is why washers are often used. However, Breakage, Wobble and Rubbing problems are often caused by how the washers are mounted on either side of saw.
Remember, washers drive the saw in the absence of a drive key. They must always be clean, flat and bur-free. A speck of dirt will let saws wobble and cut oversize. If a saw breaks, it may score the washers. Always check for scoring marks around saw hole for dirt, chips or grit. Shiny spots, as small as a pinpoint, indicate that chips where imbedded under washers. Circular skid marks indicate the nut was not tight. Generally speaking:
Saw Blade Teeth most often break as a result of:
NOTE: HSS saws will turn colors as they heat during cutting. A straw color is the limit. The saw will lose its temper when it starts turning blue. |
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