Re: [CAD_CAM_EDM_DRO] BDI and servos

Bob Simon wrote:

>At 00:09 12/8/2002 -0600, you wrote:
>
>
>
>
>>Bob Simon wrote:
>>
>>
>>
>>>Thanks, that's what I wanted to hear! I perused Tim's web site for the
>>>"hard-way install" and concluded that it's a formidable task. I have some
>>>background in UNIX systems and would like to try it sometime, but the BDI
>>>seems the way to go for the time being.
>>>
>>>How does EMC handle long streams of cutting data? Can it command non-stop
>>>motion continuously from the hard drive or just the physical memory? I
>>>can't seem to find any specifics on how EMC handles long programs.
>>>
>>>
>>>
>>>
>>Yes, it has a long horizon lookahead, and will run programs of unlimited
>>length. It has several
>>different schemes of lookahead and acceleration profiles that can be set
>>up, if you don't mind
>>digging into the code a bit.
>>
>>
>
>Can I assume by this you mean that the code for a particular scheme is
>already written and /* commented */ out of the source file? I just have to
>pick a new scheme, parameters, and recompile?
>
>

I'm not clear on that. It may be this way, or there may be different
modules that can be selected in
an include file or make file option. Not too many people have dug in as
far as the interpreter and
trajectory planning routines. All I know is that several different
acceleration schemes were
written and tried at NIST.

Jon