Basic Tube Mill Speed / Cut Off

[69FIREBIRD]

Allowable error is +/- 2mm

 

[Peter Nachtwey]

Hi 69FIREBIRD

Haven seen in any of your post the most important question raised by Peter for your requirement:

Regards

The requirements are good to know. They must not be too hard to meet given 69FireBird is willing to attempt this with a PLC. However, the time it takes to implement a flying shear or cutoff in a PLC can more than offset the extra cost of a motion controller no matter what the requirements are. There are basic requirements that must be met. I think these requirements tend to be underestimated. Then there is the support issues. PLCs don't have real time graphs and event logs that work at the millisecond or sub millisecond level. PLCs also don't ramp up or down using nice 5th order polynomials with a ton of math.

If you are interested flying shears and some shameless propaganda see:
http://forums.mrplc.com/index.php?showtopic=14908
If that isn't enough then see:
http://groups.google.com/group/sci.engr.control/browse_frm/thread/2573937888a724fd#

Edit. I just saw 69FireBird's post. 2 mm. That will be a challenge.

 

[scottmurphy]

The general consensus here is to use a motion controller, is a wise choice considering your accuracy etc.

The below are a supplier of the Delta Motion Controllers in our neck of the woods, there may be others.

http://www.ecs.net.nz/m14.asp?Page=/Motion/prods/motion/field/index.htm

Is worth a look I think, we have a project coming up where we are using them also, going to be a learning curve, but with the right tools, should be an enjoyable one.