Building My First CNC Router, Looking for Advice & Other Info

[AlexDoran]

The motors have 8 cables, is there a way to wire in parallel whilst only trailing 4 core wire back to the driver??

Thanks

Alex

[Neale]

Yes, that's how it's usually done. Bring the 8 wires into some kind of junction box with a four-core cable coming out and going to the control box. You can hard-wire the four-core into the control box or use an appropriate plug and socket. I use XLR latching connectors but there are others. My "junction boxes" are 3D-printed (cheaper than small plastic boxes from Maplin) with choc block inside but as long as the cables are securely joined and protected, use what suits you.

[Desertboy]

http://www.screwfix.com/p/debox-in-l...ctor-box/8692h



From the manual

http://www.leadshine.com/UploadFile/Down/AM882m.pdf

Mine never came with a manual but I bought 2nd hand AM882's.

[Neale]

They're a little bit bigger than the usual choc-block style connector strip, but I've used a few of these which seem to work well. They also have the advantage that because they're spring-loaded, they are much less sensitive to vibration than screw terminals. Also, each wire goes into its own little socket so no need to twist wires together as you do with choc block - always end up chasing odd strands, trying to balance the lengths of wires, etc, when I use them. Don't know if anyone sells them in smaller quantities.

[AlexDoran]

Thanks for the replies guys, think i've got my head wrapped around it now, would it be bad practise to splice & solder the wires then heatshrink it all up afterwards?

Thanks

Alex

[Clive S]

Thanks for the replies guys, think i've got my head wrapped around it now, would it be bad practise to splice & solder the wires then heatshrink it all up afterwards?

Thanks

Alex

That's the way I always do it. Use screened 4 core and ground the screen to the star point in the control box.

[A_Camera]

They're a little bit bigger than the usual choc-block style connector strip, but I've used a few of these which seem to work well. They also have the advantage that because they're spring-loaded, they are much less sensitive to vibration than screw terminals. Also, each wire goes into its own little socket so no need to twist wires together as you do with choc block - always end up chasing odd strands, trying to balance the lengths of wires, etc, when I use them. Don't know if anyone sells them in smaller quantities.

I thought I was the only one using those connectors...

Another advantage of them is the wide range of wire diameters they can handle. In my opinion, they are much better than screw terminal blocks. Basically, the only thing I find to their disadvantage is that they don't have any good way of fixing them, so if you are in need of using a few in a small space then the looks are not as nice as using screw terminal blocks. My PSU looks a bit messy because of this, but never the less, I find them very nice to use and practical.

[AlexDoran]

That's the way I always do it. Use screened 4 core and ground the screen to the star point in the control box.

Thanks Clive, this is what i will also be doing then.

Done some more on the electronics whilst i wait for some bolts to come, also need to machine some mock up parts tomorrow to finish the dry assembling, then hopefully should get some movement early next week. Was confused as hell earlier trying to figure out wiring the VFD using single phase, actually it was simplest thing ever!

Need to decide if i want to mount the controller on top of the PC Case using some kind of Arm / Swivel attachment, then fix the PC Case to the Bench the machine will be sat on, or have the Controller as a portable unit. Not sure the machine is big enough to warrant a portable one.









Thanks

Alex

[Clive S]

Alex I would be putting some insulation over the mains terminals in the box before it bites you.