Dang it, I had assumed that DRO showed the requested feed rate, not the actual.  8-(

Thanks Steve and Craig,

Using MDI and using G1 x200 f100 the speed is about 100 but the dro is random numbers.
Increasing the feed to f200 the speed of increases but dro still random. This can be done up to f500 with speed increasing to 500 but when f is increased to 600 or higher there is no change in speed dro still random.

Art

I could not figure out what was happening so I decided to hook up the router to the pc driving my mill on mach 3 which has been running well for over 10 years on xp.

After configuring and setting up only 1 axis  on mach3 to test I can push the motor to just under 2000mm/min on 24 v and 3700mm/min on 40v. Feed dro quite stable.

It would appear that it is  mach 4 problem as this was with the ESS. Only other difference is mach4 is running in Windows 10.

Any idea where I could be going wrong?

Art

It is probably time to ask Andy from Warp9 to connect into your Mach4 system using remote access and maybe he will spot what is wrong.

Hi Steve

The machine on mach3 can now feed up to 8000mm per min now.

My mach 4 machine only has a single ethernet port and no internet access in the workshop. I will drop him an email

Art

Okay nearly there.

I have reinstalled mach4 and ess using the SCU Application tool on the Warp 9 website with the latest versions of Mach4 and ESS plug in. All motors are now behaving perfectly up to 2000mm / min on 24v.  (I may increase the driver voltage to 48v later)

The only problem remaining is the feed dro is showing random numbers but on mach3 it is steady.

Art

Hi,
the feed rate DRO should be an accurate representation of the current actual speed but may not, in fact seldom is, the same
as commanded speed.

If I commanded a g1 of 1000mm/min I would expect that when the axis reaches constant speed, that is after the acceleration phase,
that the feed rate DRO would display anywhere between 950 and 1050 mm/min say.

Craig