Re: EMC stg2mod.o and problem with homing

Hi Les, Jon and the group!
I was on holidays so i coundnt experiment with the HOMING_POLARITY
I changed the HOMING_POLARITY to 0 and 1 but it has no effect!
i also changed the motion control modules, i had experimented with
newstgmod.o stgmod.o, stg2mod.o and stg8mod.o but each had same result
that is, the axis donot home! donot turn green.
I'had setup EMC on two machines,
My machine's encoders support index pulse outputs.
the encoder resolution at one machine with servo2go card has
800 CPR and the otrher machine has 2500 CPR resolution. but both of
machines are unable to home.
please suggest where this trouble lies and what might be solution to
this problem? are there any working systems with Servotogo cards on
EMC? and those have no homing problems?

thanks and best regards!!
Asim






Hi group!

I am having trouble with EMC homing.

My EMC setup is as follows:

Motor type: DC-Servos
Control system : EMC with Servo2go card
motion control modules tried: newstgmod.o stgmod.o, stg2mod.o and
stg8mod.o
ini settings related with homing are as follows:

HOMING_VEL = 0.1
HOME_OFFSET = 0.0
HOME_SWITCH_POLARITY = 0
HOMING_POLARITY = 1


when home switches in my machine are active they generate low
output thats why i've set the polarity in ini to "0"

When i am in manual mode, i select the axis by clicking the axis
position counter and then i press home button. as soon as i click
home button the selected axis moves in the direction to touch
home switch. But after touching the home switch the axis do not
stops, donot zero and neither they turn green!! instead the axis
starts moving opposite to the direction of home switch till it
presses the hard limit of the axis.
I've had used emc with steppermod.o but i never had such problem.
Please suggest whats wrong with my emc settup?

Thanks and best regards

asim





--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Leslie M. Watts"
<leswatts@a...> wrote:

> Asim,
>
> I think you should try Jon's suggestions first with
> HOMING_POLARITY. If that does not work we can check
> on index latching.
>
> Please understand that there are two Servotogo cards
> in use with EMC:
>
> Servotogo model 1
>
> Servotogo model 2
>
> Which is yours?
>
> The index problem was with the model 2 board only. I don't
> think the fix was in BDI 2.16.
>
> Les
>
> Leslie M.Watts
> L M Watts Furniture
> Tiger Georgia USA
> http://home.alltel.net/leswatts/wf.html
> Engineering page:
> http://home.alltel.net/leswatts/shop.html
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> http://home.alltel.net/leswatts/forsale.html
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>
>
>
>
> -----Original Message-----
> From: Jon Elson [mailto:elson@p...]
> Sent: Tuesday, September 16, 2003 1:06 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re: EMC stg2mod.o and problem with

homing

>
>
>
>
> Asim Khan wrote:
>
> >hi Les i am using BDIEMC version 2.16, with servo2go card
> >in past i had used the same BDIEMC cd for stepper motors but i

didnt

> >had any homing problem. for stepper motors my motion module was
> >steppermod.o
> >
> >
> I saw this exact problem with a 2.18 BDI with my Universal Stepper
> Controller,
> which looks exactly like the STG cards to EMC at the motion level.
> What we did was reverse the direction of the homing motion
> (HOMING_POLARITY) in the ini file, and approached home from the

other

> direction. This worked fine.
>
> Jon