Quote Originally Posted by John S View Post
I'll back Jazz on this and throw a bit of history into the ring.

Jazz is unique in that he works on routers, I work on lathes and mills, believe it or not, totally different animals. A mill can work fine on a USB card as the speeds are very much slower than the kernel speed the computer is able to reach. On a mill or lathe the controller is always waiting for the machine unlike a router which can easily outrun the controller, especially if servo's are used.
Thanks John I was hoping you would jump in because know you have had same BOB issues, As do many Cnc Engineers.

You also hit the nail on the Head with routers being different animals. Routers are always pushing the edge on Torque and Pulse rates because of the speeds they work at. In my experience the only way to avoid issues is by building using quality components and with performance to spare so they are running well below there maximum.

Even then It's fine line between working correctly and not. Even with experience this can catch you out as I found today. (by the way this as nothing to do with Bob's or Electrics just high lighting the differences in machines.)

Deliverd machine to Kent few week ago, 500mile round trip for me. On Friday Customer informed me was having issues with loss of position.

This is twin screw machine connected with belts so after talking with customer I suspected we had slipping pulley or some mechaincal issue, which to me is totally unacceptable and very hard to swallow or believe.!

So in the car this morning at 5am on the way to Kent to find issue. Thankfully and to relief of my pride all mechanical was fine and was just case of motors being overtuned. Bummer for me because was long trip just for bit of motor tuning, but still needed to happen for customers happiness and my own piece of mind.

But this highlights that the line between working fine and not on router with steppers is so very close. If this was Mill/lathe then wouldn't have happened (without being ridiculously overtuned which it wasn't) because motors are running no where near there maximum.