Re: [Emc-users] synchronized servo motors with phase control

2017-12-13 Thread Dave Cole
I doubt this will be an issue.  I did an application a while back (years) incrementing a position in hal for a linear drive that was actually a chain loop.  So the servo motor always ran in the same direction.    Rollover of the position counter was brought up then and calculations were made.

Re: [Emc-users] synchronized servo motors with phase control

2017-12-13 Thread Ralph Stirling
, 2017 7:16 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] synchronized servo motors with phase control On 13 December 2017 at 15:08, John Kasunich <jmkasun...@fastmail.fm> wrote: > One thing to be aware of: If your application runs the motors in the same > direct

Re: [Emc-users] synchronized servo motors with phase control

2017-12-13 Thread andy pugh
On 13 December 2017 at 15:08, John Kasunich wrote: > One thing to be aware of: If your application runs the motors in the same > direction for long periods of time, absolute position will keep increasing > even though relative position doesn't change. If HAL still uses

Re: [Emc-users] synchronized servo motors with phase control

2017-12-13 Thread John Kasunich
One thing to be aware of: If your application runs the motors in the same direction for long periods of time, absolute position will keep increasing even though relative position doesn't change. If HAL still uses single precision (32bit) floats, you eventually might start losing resolution.

Re: [Emc-users] synchronized servo motors with phase control

2017-12-13 Thread andy pugh
On 13 December 2017 at 03:21, Ralph Stirling wrote: > We have a project requiring four servo motors run synchronously, with > the ability to adjust the phase angle between motors. The motors will > be ramped up and down in velocity (remaining synchronized), but

[Emc-users] synchronized servo motors with phase control

2017-12-12 Thread Ralph Stirling
We have a project requiring four servo motors run synchronously, with the ability to adjust the phase angle between motors. The motors will be ramped up and down in velocity (remaining synchronized), but with programmable phase offsets. We will be using AutomationDirect 400W servos, with 1