Planning on a build: how to select a good driver+motor combo?

**mitchejc** · 15-01-2015

Hi, you can maybe have a look at this link, there's a handy spreadsheet that will help with getting an idea of the stepper size required
http://www.mycncuk.com/threads/1524-...stepper+sizing

**Boyan Silyavski** · 16-01-2015

Basically the all around best combo is Toroid PSU 70V 550-600W , High voltage drivers like AM822, 3NM low inductance motors like SY60STH86-3008B Nema 23

The most economical way to build that is to buy the transformer/2x50v AC wired in parallel or 2x25V AC in series >550W for 4 motors/, then power regulator board with big capacitors from ebay to rectify it, the drivers from China aliexpress and the motors from Zapp.

0.8mm /18AWG cables 4 core shielded for the motors. I would use the same cable for the sensors and stuff. Easy to solder and strong. My first build i used thin alarm cable that alarmingly f@@@ed up. So just buy 1 entire roll is my advice.

Assuming you don't make a heavy gantry >80kg, for 1:1 driven i mean. Most of the people go with 1610 ball screw on all axis and 1605 on Z , That makes fast and and the same time with good resolution machine.

20T HTD 15 pulley is the most used, 1:1, the belts used are in the 250-310mm length area. 15mm wide , beltingonline.com

SY CABLE CLEAR SHIELD BRADED 1.5mm 4 CORE cable for the spindle to VFD

And so on

**Noplace** · 17-01-2015

thanks for the info! offtopic question if you dont mind, I've been looking at ball screws, found some at automation4less.com which looks like a decent site but the prices for the screws and its parts is kinda steep, I did find on ebay also from chinese sellers, question is does it matter which one I pick in quality or are the chinese good enough ?

**EddyCurrent** · 17-01-2015

The sellers listed here seem to be the most popular, I think the Chinese stuff is fine, many people here use it.

http://www.mycncuk.com/threads/8189-...4544#post64544

**Boyan Silyavski** · 17-01-2015

yes, it matters i believe. Like Eddy says- Linearmotion bearing, solar jean . I buy from BST automation /aliexpress/ - Fred. He has all, from drivers to ball screws, same price as Chai and overall very good experience. Good at fixing mistakes also. The machining is 0.01mm spot on.