Warco VMC Turret Mill - CNC Conversion

[antsals]

I've been in the process of converting a Warco VMC Turret mill for quite a while. I have recently up'ed the stepper motors to slightly more powerful but I have a niggle on the machine.

The Warco major build log is a good starting point as I can see a few items like the gib strip screws have been modified.

I'm using eazicnc system and g-code generated from featurecam. The main problem I'm having is that as I am machining for example a circle every so often the machine just goes off on a striaght line? The g-code is perfect it seems to be the machine. What I think it is is the x axis is jamming up and overloading the steppers so that the motors arn't turning therefore the circling motion goes out of sync.

My first question is has anyone out and about tried converting this type of machine and what have you done to mount the x - y axis ballscrews?

At the moment I have a temp x-axis mount so I could test the machine but keep encountering this problem. I'm really not sure what to do next looking for some guidence I'm even thinking the ballscreaw could be bent between the two fixed bearing mounts?

I have been cutting aluminium only 1mm cuts with 16mm endmill at 400mm/min? Whats your thoughts should I be able to run faster? Deeper cuts?

Any thoughts I would appreciate.
Cheers
Ant