Hello everyone,

Been out the picture for a while due to health reasons however I am now finally designing my CNC conversion for my VM32l.

I have read loads of posts and spoken to various members - and from their excellent advice I have finally narrowed it down.

The mill will be fitted with Ballscrews (2005 on Z / 1605 on X and 1605 / 2005 on the Y undecided still ) and driven directly (no reduction/ gearing )

Power will be the custom Toroidal power supply - as in many of the forums.

The Z already has a internal gas strut.


I have 3x drivers already - (0~7A - 18-80V DM860H) DM860H - however I can sell or save these.


After looking at low inductance I have the following shortlist for all 3x axis:


This stepper with above drivers (0~7A - 18-80V DM860H)

4 Wire- Inductance: 1.85 mH ± 20%(1KHz) - Holding Torque: 4Nm(566.4oz.in)


or a Closed Loop Kit

4 wire - Inductance: 1.8 mH ± 20%(1KHz) - Holding Torque: 3 Nm(424.92 oz.in) with 0~7A（0~5 RMS）+24~50VDC (Typical 36VDC) Driver

or

Closed Loop with separate Driver for the extra vdc

4 wire - Inductance: 1.8 mH ± 20%(1KHz) - Holding Torque: 3 Nm(424.92 oz.in)

0~8.5A（0~6 RMS） - 20~80VAC/30~110VDC (Typical 48/60VDC)

I have tried to keep inductance below 2.0

Any other suggestions are welcome including different motors for different axis and nema 34's etc; however re the torque curves, I see very little benefit and they have a higher MH (3 and upwards)


BONUS QUESTION

How much roughly do people pay re customs and VAT form BST for ballscrews - working on costings

Many Thanks

Mike