General info:
ModelCanon PowerShot A570 IS
MakeCanon
Basic shot info:
Focal Length5.8 mm; equivalent: 29 mm
Aperture ValueF3.2
White BalanceAuto white balance
FlashFlash did not fire, auto
Metering ModeMulti-segment
Shutter Speed Value1/50 sec
ISO Speed Ratings400
Advanced shot info:
Exposure Bias Value5/3 EV
Exposure Time0.02 sec
Exposure ModeManual exposure
Max Aperture ValueF2.6
Exif-related info:
Exif Version2.20
Exif Image Width600 pixels
Exif Image Height517 pixels
Color SpacesRGB
CompressionJPEG (old-style)
User Comment
 Broken bike parts » Pedals » End of broken spindle (image 2 of 3)


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End of broken spindle
We are looking at the broken end of the stub of the spindle. The break began at the lower right in the photo, which was near the top as the pedal was installed, and was under tension with each turn of the cranks. The two sharp little indentations extending in from the lower right suggest that an irregularity in the metal initiated the crack. The classic pattern of crack growth in metal fatigue is visible, progressing from there toward the diagonal line that runs from 8 o'clock to 1 o'clock.. A fatigue crack grows slowly, bit by bit. Some "beaches" showing the limits of different stages of crack growth are visible in the area below the diagonal line.

The rough surface at the upper left, above the diagonal line, is characteristic of sudden breakage.

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Photos and captions by John S. Allen
unless otherwise indicated.