On Fri, Jun 29, 2012 at 2:05 PM, Viesturs Lācis <[email protected]>wrote:
> 2012/6/28 Yishin Li <[email protected]>: > > > > We then developed AR02 in replace of 7i34, and it solves the EMI noise > > problem in that factory. You may refer to > http://en.araisrobo.com/linuxcnc for > > the functional block of our control system. > > Do I understand correctly, that You are running both stepper and servo > drives with step/dir signal and the difference for both is that servos > do provide encoder feedback, while steppers do not? > Yes, we implemented closed loop PID control for servo drivers with its pulse interface. This servo loop is for keep tracking the trajectory commands. We choose digital A/B phase pulse interface because we believe it's more immune to EMI noise than analog interface. For steppers, we just bypass the PID loop and ignore encoder signals. So I cannot really decide, how to do it best, as the plan is to > actually build 2 machines - one for client (pure plasma with downdraft > - that has already been agreed with customer) and the other one for my > own use. And I want to use my machine not only for plasma also for > routing/milling. Especially aluminum, so that I can make parts for > similar machines in future. I have clear plan for the machine itself, > but I am having trouble, how to design the table - for milling I need > stiff surface (could be 8 mm steel plate with a grid of holes with > thread to clamp material) and collection of the coolant (could be a > pan under that plate), for plasma I will need bunch of slats with > nothing beneath them, except for water and/or free space for > downdraft. I do not want to have to 2 table surfaces to be removed and > then placed on the table. > Does anyone have something to suggest? > Have you consider build the machine larger? I mean you can use 80% of the area for plasma cutting and the other 20% for routing. In this way, you can share most of the electrical parts, and prevent the plasma dust from falling on your milling surface. Yishin ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
