Everything in the standard is derived from these crank stop “datum planes”, including the method of measuring a spindle.
#ISIS DRAW 2.5 WINDOWS 10 KEYGEN#
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The entire ISIS Drive system is based on the crank stops of the spindle. Why use the spindle designation number instead of the overall length? Whatever it is, the way you tell your story online can make all the difference. Or maybe you have a creative project to share with the world. Maybe you want to turn a hobby into something more. By adding this number to the “chainline offset” provided by the crankset manufacturer, you can easily figure out the resulting chainline of that particular crank assembled onto any ISIS Drive bottom bracket of a given designation. Since all the spindles in the standard are symmetric about the BB shell mid-plane (theoretically the frame centerline), one-half the spindle designation number is the distance from the BB shell mid-plane to the drive-side crank stop on the bottom bracket. The spindle designation number is the nominal distance between the crank stops on the spindle. What does the spindle designation number mean? Some spindle materials may be forged, although the process must usually be accomplished using multiple forging steps. Alternatively, machining the spindle in a mill is also possible, although care must be taken in fixturing to assure the correct alignment of the spline ends.
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Machining can be quickly performed with a three-axis NC lathe. The spindle can be easily machined or forged, depending upon the material. Bottom Bracket Questions What is the best manufacturing method for the spindle?