3 Axis CNC router

**njhussey** · 03-10-2016

I've got an 8Nm Nema 34 in my X axis and 240V drive but 10mm pitch screws....you could always go 2:1 on the pulleys. I cut plastics at 7500mm/sec and that's plenty quick enough 😁

How heavy is your X axis?

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**Clive S** · 03-10-2016

I cut plastics at 7500mm/sec and that's plenty quick enough 😁

Neil Are you sure

**JoeHarris** · 03-10-2016

Originally Posted by Clive S

Neil Are you sure

Per min I'm guessing!

**njhussey** · 03-10-2016

Originally Posted by JoeHarris

Per min I'm guessing!

Erm....yes...per sec would be going some!!!!!

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**njhussey** · 03-10-2016

Originally Posted by Clive S

Neil Are you sure

Oops....its late and I was moving house all weekend....still at the old rented house now touching up paint, filling holes etc.....

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**JoeHarris** · 03-10-2016

Originally Posted by njhussey

Oops....its late and I was moving house all weekend....still at the old rented house now touching up paint, filling holes etc.....

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Bet your glad your machine is a work! I don't fancy moving this beast!

**JoeHarris** · 03-10-2016

I'm not sure on the weight, not crazy as it is ali extrusion and 20mm plate - pretty standard L design! It wasn't standard when I started but people keep starting and finishing their builds while I keep trudging along at a snails pace! I was planning on going 2:1. Have you cut much wood - how slow can you go?!

**JoeHarris** · 03-10-2016

Quick progress shot to prove I haven't given up!

**Clive S** · 04-10-2016

Certainly looking good Joe. Re the nema 24 I use one on the Z on my mill but on the router very similar to yours I use two 23's but Dean when using one belt for the two screws uses a nema 34 but no doubt he will confirm this for you.

**JAZZCNC** · 04-10-2016

Joe that 4nm 23 will struggle with 2 x 5mm pitch screws. It will turn them no problem but you'll have to sacrifice speed and with only 5mm pitch your already down on speed. I'd estimate you'll get around 4mtr/min Max rapid speed which isn't really enough for router. Idealy you'd want at least double this.

With 5mm pitch you'll struggle to get this with any single stepper motor 34 or 23 unless you go for larger motor and use ratio 1:2 ie Big pulley on motor small on screw. You need the larger motor becuase the ratio lowers torque not increases. Also you'll lose resolution but because you effectively have too much to start with this isn't problem.
My original machine ran with 6Nm with 2005mm pitch screws on 1:2 ratio running on 70Vdc and worked perfectly for well over 5yrs.

My advise is either change to 10mm pitch with small ratio if using 4nm 23 or go with twin motors.

To give you some idea I've just built 2 x 1250 x 750 sized machines that are using twin 2010 screws with no ratio applied running on single 4.5Nm 34 with 72Vdc using AM882 drives and they are tuned at 10mtr/min.