thanks cjmerlin. Yes your first method sounds great. I have found a nice looking solenoid driver
http://www.rwautomation.com/products_sc5.html that should do it. I`m not sure if my current valve driver is up to the job and is not configurable like the SC5 is. So i`m looking at that.
I still have some reservations on to how to implement the S codes within a program, it obviously pretty easy to edit the gcode for a simple rectangular path, but when I start to do more complex profile work I`d need an automated way to implement S codes. I will send an email to VisCam support to ask whats possible with their software, this can`t be an isolated problem.
Brett I appreciate what you`re saying about speed and accel but I really feel my speeds are too slow, full rapid measures around 60 inches per min, this equates to around 25 mm per sec and although I remember saying if I got a build speed of around 30mm per sec I`d be happy, well at the moment I`m feeling I need a lot more lattitude to play with, I dont want to be caught short later on in the project.
This reasoning is also coupled with the fact I do have a few mechanical issues to sort out, trouble is every now and then I hear the motor stall at 25mm/sec. so it`s not reliable enough. And life in the freezer throws up a few issues for my Y axis linear system, so I need to deal with that also.
Trust me my brain is on overload trying to get my project working.
tnx again for all the advice.