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Here is a wealth of information about many machining topics.

This page gives cutting speeds for turning, milling, and drilling of several different materials. It includes a calculator to figure the spindle speed required.

This page give the dimensions of Morse, Jacobs, Brown & Sharpe, and Jarno tapers.

This is a chart of fractional inches represented in decimal inches and millimeters.

Suggestions for fuel for powering Stirling engines.

This chart shows the spindle thread of many lathes. But don't count on it. Measure the threads on your spindle.

This chart shows the diameters of letter gauge drills size A (the smallest) to size Z (the largest).

Online machinist's calculator.

  • Find tap drills, thread specs, and clearance drills
  • See what drills are contained in drill sets
  • Find the closest drill to the hole size you need
  • Find the correct cutting speed and feed rate
  • Find the height of spacer blocks to use
  • Find the locations of holes on a bolt circle
  • Find the diameter of an existing bolt circle

This chart shows the diameters of number gauge drills size 80 (the smallest) to size 1 (the largest).

We have identified paints that match the various colors used to paint mini lathes and mini mills.

This page give rake and relief angles for turning various materials with high speed steel tool bits.

These symbols are used on the Mechanical Models engine drawings as well as on many other drawings.

This tap and clearance drill chart shows tap and clearance drill sizes for standard threads. There is also a printable version that has both metric and inch threads.

Lew Merrick has put together more information about threads than you ever thought you wanted to know.

Additions or changes?

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