Denford Triac VMC w/ ATC conversion

[uli12us]

I know, that µstepping don't enhance the real resolution. But in the case of an exact circle, it'll enhance the circular form. And maybe I can reach a little bit better fit. with my little Emco, I have only
72 ppr, so i have a minimal distance from 0,0277mm in diametre. Thats a bit big if I want a tight fit for ball bearings or similiar parts.
Thats only, because the normal *4 or *8 µStep brings a bit strange results, that can't display on a
standard XYZ-display of a machine.

[JAZZCNC]

I have only 72 ppr, so i have a minimal distance from 0,0277mm in diametre. Thats a bit big if I want a tight fit for ball bearings or similiar parts.

That's a strange Number for Stepper motor.? That's 5 deg per step.! Are you sure.?

[uli12us]

Yes, thats a 30Year old machine. they used bergerlahr 5fase steppers, with a strange driver as well.
But as long as the machine run without problems, i don't change the control and drive parts of it.
The precision is rather limited, but I don't need often H7 or smaller. In the mill its another thing,
if I want a bore for a bearing, it must be within 1 or 2/100mm. I can't easy grind it to the next tolerance end.

[JAZZCNC]

Yes, thats a 30Year old machine. they used bergerlahr 5fase steppers, with a strange driver as well.

Even stranger then because 5 phase steppers give much lower Step angles due to having 10 poles. This is why they were used because the gave greater resolution and lot smoother running because of smaller rotor steps. They also increase in torque when Ms rather than loose torque like 2 phase steppers do.
The down side being more PPR required compared to 2 phase motor.

The first Smaller leadshine Hybrid Servo motor used 5 phase steppers for this reason. 2Nm Hybrid servo motor gives a 3nm 2 phase motor a run for it's money and is lot smoother.

[Gary]

they were 3 phase actually, leadshine dont make 5 phase drivers.

[JAZZCNC]

they were 3 phase actually, leadshine dont make 5 phase drivers.

Ye had brain fart on that one Gary for some reason I had it in mind they where 5 phase motors but on reflection it was obvious given U V W wrote on top of drive. .

[uli12us]

Don't misunderstand me, I want to change the control Unit of My Boxford machine. The Emco with the
strange Motors should be original. And only for the Boxford I need eventually the 2000 µstep from a
leadshine driver.