Hi Andy,

I might take a look at modifying the component.  I’m comfortable with C, so 
perhaps I can work it out pretty quickly.  I do like the spindle component’s 
concept, but it seems there are some issues.  Nonetheless, fixing those issues 
might be a bigger project than I can handle when the primary goal is getting 
the machine running again.

Matt

> On Dec 15, 2020, at 6:23 AM, andy pugh <bodge...@gmail.com> wrote:
> 
> On Tue, 15 Dec 2020 at 01:42, Matthew Herd <herd.m...@gmail.com> wrote:
>> 
>> I’ve spent some time playing with the spindle component.  It seems to have a 
>> number of bugs, beyond the issue with the documentation.  Somehow a negative 
>> speed command multiplied by a negative gear ratio yields a negative speed.  
>> And the forward and reverse pins track the commanded speed, not the gear 
>> ratio, despite what the documentation indicates.  It has promise, but seems 
>> to have quite a few things that need to be worked out.
> 
> I think that "gearchange" was written for a Bridgeport, is that any
> better for you?
> 
> http://linuxcnc.org/docs/2.8/html/man/man9/gearchange.9.html
> 
> It might not handle the fwd-rev commands quite as you want, but it's a
> fairly simple HAL component and they are easy to modify. (Especially
> if you know C already, or are prepared to learn it)
> 
> https://github.com/LinuxCNC/linuxcnc/blob/master/src/hal/components/gearchange.comp
> 
> -- 
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1912
> 
> 
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