Machining Tips
Carbide Burr Selection
CARBIDE BURR SELECTION AND USE Burrs are sometimes referred to as rotary files and come in many shapes and sizes. Typical applications are weld preparation, weld smoothing, deburing, chamfering, deflashing, and scale removal. Burs are typically chucked in air driven die grinders and used in hand operations. Burr Selection The…
Multiple Lead Threads
Chances are that when you think of threads you think of threads in which the pitch and the lead are the same. An example would be 1/4-20 with both a .050 pitch and lead. However on a daily basis you may use multiple start threads far more than single start…
End Mill Selections
Flute selection with end-mills offers the same challenges as with drills and taps. Flute selection is normally a matter of compromise between available chip space and strength of the remaining core of the tool. Obviously, deeper and wider flutes make a smaller diameter core cross-section, which becomes sometimes unacceptably weaker….
Tin Coated Plug Gauges
When are TiN coated gages recommended? Where the product material is abrasive causing excessive wear on the gage or any high volume application where there is continuous or frequent usage. The extra hard surface and lubricity of Titanium Nitride greatly extend the wear life. This also permits longer frequencies between…
Boring Basics
Boring is an internal turning operation used to make holes bigger. Single-point cutting tools—boring bars—are the most commonly used tools. As a boring bar cuts, the cutting force may be applied far from where the tool is supported. The unsupported distance between where the cut occurs and where the boring…
Thread Hole Size
ASME B1.1 specifications allow for larger hole sizes to be used if the length of engagement between the internal and external thread is long enough as not to compromise thread strength. Hole size is selected based on the number of tap diameters of the length to be tapped. The greater…
Tapping Depth for Pipe Threads
TAPPING DEPTH FOR PIPE THREADS Standard taper pipe taps are designed to produce sufficient thread depth for standard pipefittings. This would include 4 to 5 turns or threads for assembling the parts “hand tight”. These are known as L1 threads. Following these are three additional turns for “wrench” tightening to…
High Performance Drill Point Angles
HIGH PERFORMANCE DRILL POINT ANGLES Why do high performance drills all have points in the 130º-150º range instead of 118º points? As a general rule harder materials are drilled with 130º to 150º points and softer materials like wood, hard rubber, plastics, and fibers are drilled with 90º to 100º…
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