Reply by Alan S

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Posted on "Homemade" digital bevel gauge

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Alan S

181 posts in 4289 days

#1 posted 12-13-2011 05:51 PM

This certainly is not using GPS. Smartphones all have accelerometers built into them now. That’s what these apps use. The accelerometer measures the direction of the pull of gravity. So the accuracy will depend less on the application you use and more on the quality of the accelerometer within your own phone. Since you are setting a zero angle baseline, you are doing a relative measurement, and relative measurements can be fairly accurate.

The biggest source of error I see is the jig rocking toward or away from you since the plywood is fairly thin. Maybe adding another piece of wood to make a T would eliminate that possibility. You’ve just got to still allow the jig to fit between the saw teeth.


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