Re: [CAD_CAM_EDM_DRO] Encoder counts/revolution

In a message dated 13-Jun-02 17:41:39 Central Daylight Time,
pete@... writes:

> This is probably a stupid question, but is there any reason to avoid
>

NOT a stupid question, at all! Depends. If you are building a machine which
operates on decimal fractions, the base-ten is logical. If your primary
concern is the simple use of binary up/down "ripple-counters", then 2^n
counters (like 2048, etc.) can make sense in some instances (that is why they
are made, at all!).

If I design a machine with integer-numbers of millimeters (or tenths of
inches) per turn of the lead-screws, I would go for 1000, 2000, maybe 4000,
or 5000 counts per turn. But I haven't thought of "what number to choose" in
so long, I don't know what PROPER examples to make for you! The last "CNC"
machine I did was stepper-motors with 4 mm/turn lead-screws, so each step is
0.02 mm. This is almost cumbersome at times, but I "live with it". A 2-mm
lead screw would have been "mathematically better" (0.01 mm per step), but
the machine would have been too slow to be "profitable". As it it, it
WHIZZES, and the resolution is just fine!

Jan Rowland, OLD Troll


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