Sonny Jeon 9b9abf1b2f Fixed bug related to very very low feed rates. ...

- A very very low feed rate command like `G1 X100 F0.01`  would cause
some floating-point round-off error and freeze Grbl into an infinite
loop. To fix it, introduced a MINIMUM_FEED_RATE parameter in config.h
to ensure motions always complete.

- MINIMUM_FEED_RATE is set at 1.0 mm/min by default. It’s recommended
that no rates are below this value, but 0.1mm/min may be ok in some
situations.

2014-08-05 16:17:45 -06:00

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