Chinese 'Hybrid Closed Loop' steppers vs 'regular' open loop steppers

[depronman]

Newbie here, looking at hardware choices for the X and Z for my Boxford 240TCL update.

Browsing the variety of Chinese stepper motors on eBay. I've noticed that the prices on what they call 'hybrid closed loop stepper motors' - i.e. a package of stepper motor with encoder and control box - is now around the same price per unit as what I would pay for similar open loop models without the encoder which are not trying to ape a servo system. Equivalent NEMA 34 size units are around 30mm longer, accounting for the encoder.

Does anyone out there have any experience of fitting and using these (usually 2 phase) in preference to open loop equivalents? Bearing in mind the equivalent price, is this a worthwhile choice?

Many thanks in advance.

I’ve been using a Norma 34 close loop stepper on the Z axis on my boxford bud cnc conversion lathe. It’s been up and running 2 years and works perfectly. Very accurate and I have never noticed it loosing any steps
The nema34 is direct drive through a 5mm pitch lead screw
Would it have performed the same without the close loop, I’ve no idea

Paul


Sent from my iPhone using Tapatalk

[clutchslip]

I’ve been using a Norma 34 close loop stepper on the Z axis on my boxford bud cnc conversion lathe. It’s been up and running 2 years and works perfectly. Very accurate and I have never noticed it loosing any steps
The nema34 is direct drive through a 5mm pitch lead screw
Would it have performed the same without the close loop, I’ve no idea

Paul


Sent from my iPhone using Tapatalk

Thanks for the reply Paul, good to know yours have been reliable. My setup is not a direct drive like you have on your Boxford, but can I ask what motor torque capacity you went for your Z axis? What vintage is your BUD by the way?