First Proper CNC Router

[JAZZCNC]

Drivers are rated to 7A, and motors just to 4.2A. Probably will be running them at over 3.14A ref I think.
Would a 4A fust be okay?

5A would work better. Gives some safety to drives but won't trip when motrs are being worked hard.

Currently looking at the industrial DIN rail fuses holders like this one, unless anyone can suggest anything better/cheaper.

These are what I use, cheap and easy to wire and change.

https://www.ebay.co.uk/itm/5X-FS101-...72.m2749.l2649

Also looks like most people are using double pole MCB's on the live and neutral before the PSU. Is this essential? I thought only the live would need one?

No don't need double pole.

I prefer these to Din rail connectors when creating Busbars. Lot cheaper as well.

https://www.ebay.co.uk/itm/Set-6Posi...72.m2749.l2649

[diycnc]

Thank for your help JAZZCNC.

When it comes to settings the driver current, the drivers have peak and REF values labeled on them. Which one should I be concerned with?
I found the same question in routercnc MK3 build thread, but couldn't find an answer.

[JAZZCNC]

Thank for your help JAZZCNC.

When it comes to settings the driver current, the drivers have peak and REF values labeled on them. Which one should I be concerned with?
I found the same question in routercnc MK3 build thread, but couldn't find an answer.

Use Peak values.

[diycnc]

Transformer, fuses, mcb, and terminal block on order. Wish me luck!

[diycnc]

Whilst I wait for the psu parts to arrive, I was thinking about the driver fuses. With the current setup, if one fuse blows on say the z axis, the other axis will just continue regardless, potentially damaging the part or even the machine. Is there a software or hardware tool to stop this happening?
Would a 3 pole fuse holder work? Or is each fuse still independent of the others?

[JAZZCNC]

What drives you using.?

[diycnc]

DM860T drivers from stepper online.
https://www.omc-stepperonline.com/download/DM860T.pdf

[Kitwn]

With the current setup, if one fuse blows on say the z axis, the other axis will just continue regardless, potentially damaging the part or even the machine. Is there a software or hardware tool to stop this happening?

I've been wondering about how to retro-fit stall detection to deal with every 2-motors-on-one-axis-machine owners worst nightmare using DIY rotary encoders. So far I have a bag of 15 optical detectors (under $10AUD including delivery from RS), a nice Postcript file that Google found for me that will draw the encoder pattern and a piece of 0.25mm stainless shim. The plan is to use the 'toner transfer' method beloved of DIY circuit board builders to acid etch my own discs to fit onto my ballscrews and use an Arduino to detect when one axis moves and the other doesn't. You could always use this to detect lack of movement on any axis by comparing the encoder output with the step pulse input.

This is going to be one of those 'something to do while the varnish dries on my main activity' projects so don't hold your breath, but I will be reporting my success (if any) on the forum.

Kit

[AndyUK]

Each fuse is still independent.

You might be able to detect an unpowered driver with a properly configured fault output and a controller that is checking for this signal?

[ericks]

Nice, looks like you making good progress:)