On Tuesday, July 26, 2011 02:47:21 PM Dave did opine:
> On 7/26/2011 2:43 AM, Greg Bentzinger wrote:
> > Message: 2
> > Date: Mon, 25 Jul 2011 21:32:52 -0400
> > From: Dave<e...@dc9.tzo.com>
> > Subject: [Emc-users] Machine re-control with two "X" axes
> > To: emc-users@lists.sourceforge.net
> > Message-ID:<4e2e1944.7090...@dc9.tzo.com>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> >
> > I am looking at re-controlling a machine that has two parallel "X"
> > axes - one is called X and the other is U.
> >
> > The machine consists of two parallel sliding tables beneath a single
> > head. The head is mounted to an overhead Y axis and Z axis.
> >
> > Only one sliding table is used while cutting a part. The idea was
> > that one table could be loaded with a new part to process while the
> > other table was being used to cut a part.
> >
> > The existing control, an 11 year old Osai control, has the ability to
> > switch which between the hardware X and U axis. The programs are
> > written only in terms of X,Y, and Z.
> >
> > I believe there is a switch on the console to determine which table
> > will be used prior to the part program being run.
> >
> > My question is: What would be the best way to implement this two "X"
> > axis control scheme with EMC2?
> >
> > Thanks,
> >
> > Dave
> >
> >
> > It would seem that some fancy HAL programming might be able to address
> > this as either a Pallet code (more useful) or Table code (kinda
> > unique to your machine.
> >
> > Either way EMC could use a normal XYZ type program by defining which
> > pallet or table is active so that only one "X" axis exists at any
> > given time.
> >
> > Pallets add another level of complexity to the machine coordinates
> > because axis boundries can be different for each. In a sense the G53
> > values could be unique to each pallet. Adjusting and applying proper
> > workshifts (G54-G59 ect.) allows the Tool table to use the same tool
> > Height offset value without concern for which pallet or table is
> > active.
> >
> > I know as EMC2 exists (my not so current version) that to replacate
> > the work I do on a Kitamura HX400 4axis horizontal with cube pallets
> > - I would be replacing workshifts via G10 extensively - It was common
> > to use 60-80 sets during a run.
> >
> > At some future time I can see that the whole Tool Table / Workshift
> > tables and variables will need to grow dramatically.
> >
> > My Hal / pallet idea only works because you never are cutting both at
> > the same time. A larger problem would be a dual turret lathe, and at
> > this point the easy way out for that might be running a second EMC PC
> > slaved to the master machine control.
> >
> > Greg out - must sleep!
>
> Thanks for the ideas.. Right now I think they are doing an "Osai"
> version of G92 after homing to change the origins, which is an odd way
> to implement an offset IMO.
>
> I'm not confident that the guys who did the original machine did a great
> job on the controls.
>
> Dave
Perhaps a BBLB machine?
Cheers, gene
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