[Emc-users] Need some education

[Gene H. <ghe...@sh...>]

Greetings all;

In the ini file for this lathe theres a line that sets a named var 
that the hal file uses later.

[SPINDLE_9]
PWMGEN_S_SCALE  = 49.0 (I've no clue where that 49 came from originally)

Then in the hal file:
#######################################
# Hook pwmgen.00 to the spindle speed #
#######################################
setp   hm2_[HOSTMOT2](BOARD).0.pwmgen.00.scale      [SPINDLE_9]PWMGEN_S_SCALE

The obtained rpms was quite low for an s350m3, around 125 rpms.

Since that looked like I should add some gain to get the spindle up to 
speed, I multiplied that 49 by about the ratio, came up at nominally 
140 for this new scale.

Sure, motor didn't start, looking at vfd display it was sending 
the motor about 5Hz and that slow is locked off.

So the change from 49 to 140 was the wrong direction.

Looking at the bigger mill, such a var and how its used, isn't.

And I now its not in either of the small machines in the shop building.

The pdf docs don't mention it.

So how does this work, or is it a pure cuss & cry thing?

Thanks for any clues.

Cheers, Gene Heskett
-- 
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