Re: Re: SLO-SYN 12.7 Amp motors

tyler@... wrote:

> From: tyler@...
>
> I have retrofitted several full sized machines removing old technology servo systems and installing current technology stepper systems which are properly sized to the application and using properly configured software. These machine are all running and making parts.
>
> People seem to really be afraid of stepper systems because of the potential for lost steps. A properly configured machine will have a window in which it will operate very reliably. It will be as accurate and repeatable as the mechanics and positional accuracy of the steppers will allow, assuming the software is working correctly. In some respects, the stepper system may be somewhat better in the fact that it doesn't have a following error.

That is false. The following error necessarily must be less than a few steps, otherwise it has already
lost a step. But, there definitely IS following error.

> I do realize that in the past with the older technology that machines commonly lost steps, motors were ruined because of excessive heat and current. Stepper drivers were terribly inefficient, un reliable and costly to maintain. The newer stepper systems are light years ahead of the older drives and are not plagued by the same problems.
>
> I have an Ikegai FX20 20hp turret lathe that pretty much runs day and night producing forklift replacement bushings or various threaded inserts, weldments etc. this machine is using a 1600 oz in pac sci motor on the x axis, and a 2100 oz in motor on the z. The turret is automated with a macro which reads standard tool change commands. this machines just runs and runs and makes parts which are very repeatable for a machine of this vintage. this machine is about the size of a mini van and I know that the Z axis is moving lot more weight than 800#.

And, those are HUGE motors!

Jon