MK1 Steel router build log 1500x800x200

[Clive S]

Hi Clive S,

I have no clue on how much air i need glad to hear 4 will do.
Need to find out before buying a suitable compressor (will a double or quad airbrush silent type work?)

About spindle cooling.
Do any of you run a pc cpu cooling type radiator/pump on the z assembly?

About the vfd.. spindle 1.0 mm2

Grtz Bert.
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I use something like this on the back of the gantry with less that 1 ltr of water. https://www.aliexpress.com/item/80mm...ceBeautifyAB=0

but you can get one with a little bigger and fit a 120mm fan.

Re the VFD 2.2Kw is at the mains side so at the motor side rough figures prb. about 4A per phase ish.

re the 4mm tube I find that more than enough flow. I have it at about 8 bar and regulate it down on the gantry.

[routercnc]

For the drag chains:
My old machine had drag chains down both sides. On one side I ran the signal cables and on the other side I ran the stepper cables and power lines (pump, light etc.). This was to keep them separate for interference. I've seen others groups them all together so maybe not required but it would give you double the space. Each one was quite large if I remember correctly, maybe 50x20 or so?

For the cooling:
An earlier version of my old machine had the radiator on Z axis and that worked fine but did not look very nice with all the tubing sticking out. I moved it to the end of the gantry which was better.
On my next machine I'm planning to run the cooling pipes all the way through the drag chains and off the machine to a reservoir tank (no radiator) as I found the spindle got barely warm even with the fan off (and sometime the pump off as well for small jobs). I will rely on the thermal inertia of a much bigger tank of water. Easy to add further cooling if it does not work but experience of the old machine suggests it will be OK.

Compressors:
I'm no compressor expert but when I last looked at them you could either have quiet and low flow rate, or noisy and high flow rate. If you wanted higher flow and reasonable noise you needed to get multiple cylinders, belt drive but they were a lot more money.

[driftspin]

I use something like this on the back of the gantry with less that 1 ltr of water. https://www.aliexpress.com/item/80mm...ceBeautifyAB=0

but you can get one with a little bigger and fit a 120mm fan.

Re the VFD 2.2Kw is at the mains side so at the motor side rough figures prb. about 4A per phase ish.

re the 4mm tube I find that more than enough flow. I have it at about 8 bar and regulate it down on the gantry.

Ok so..

So i am reading between the line, you are saying the vfd does 400 volts secundary.. That is even better actually.

Routercnc
You say you moved the radiator to the end of the gantry. Pure cosmetics?
I dont want to design in a direction that is some how flawed... or less desirable for know reasons.

Dual dragchains might do the trick also.
need to look in to that.

Ok so i will first reduce size on the diameters for vfd cable and air/mist lines.
After that i can measure cable length per type. see if i can get to 50% or so fill rate for the dragchain. if no i have to bite the bullit and go bigger.


Grtz. Bert


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[routercnc]

Yes, moved the radiator just for cosmetics. Worked fine where it was, weight was not a problem on the Z axis. But radiator was 120 mm size with fan and pipes sticking out so did not look so nice there.

[driftspin]

I use something like this on the back of the gantry with less that 1 ltr of water. https://www.aliexpress.com/item/80mm...ceBeautifyAB=0

but you can get one with a little bigger and fit a 120mm fan.

Re the VFD 2.2Kw is at the mains side so at the motor side rough figures prb. about 4A per phase ish.

re the 4mm tube I find that more than enough flow. I have it at about 8 bar and regulate it down on the gantry.

Hi Clive S,

Do you think the leadshine dm856 will do for my setup?

http://www.leadshine.com/productdeta...DM&model=DM856


Or will i gain lots in buying am822 drives.
I am not sure i can still buy them oem ... Though somebody said there is nothing wrong with a good copy.

They look alright @80v /5.6 amps

I have the cnc4you 4amp 4nm nema23 steppers.

Grtz. Bert

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[Clive S]

I have no experience of them but they look OK I see they only go up to about 5.6A might be getting a bit close!!

I have purchase three of these:-

https://www.ebay.co.uk/itm/2DM860H-2...7453%7Ciid%3A1

But not tested yet.

[driftspin]

I have no experience of them but they look OK I see they only go up to about 5.6A might be getting a bit close!!

I have purchase three of these:-

https://www.ebay.co.uk/itm/2DM860H-2...7453%7Ciid%3A1

But not tested yet.

Hi Clive S,

I am unsure what using 4 out of 5.5 amps will do to the drives life time.
25% headroom sounds ok.


I do like the idea of having an alarm ouput also.

Do you have any idea on when you have the drives up and running?


Grtz. Bert.



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[Clive S]

Hi Clive S,
I am unsure what using 4 out of 5.5 amps will do to the drives life time.
25% headroom sounds ok.
I do like the idea of having an alarm ouput also.
Do you have any idea on when you have the drives up and running?
Grtz. Bert.
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No sorry the control box is built but the mill it is going on will take some time. I purchased the above because am882's are getting hard to find.

[driftspin]

No sorry the control box is built but the mill it is going on will take some time. I purchased the above because am882's are getting hard to find.

Hi Clive S,


I have been researching some more.

Do the spec of stepper memtion rms or peak amps? Looks like the 2dm856 driver is rated 4 amp rms ...... 5.5 peak.

https://cnc4you.co.uk/resources/Step...1-03%204Nm.pdf

Are those rms values?
Ill send an email to cnc4you and find out.

Grtz. Bert.

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[JAZZCNC]

Are those rms values?
Ill send an email to cnc4you and find out.

They are Peak ratings, most motor ratings if data sheet doesn't show both will be the peak rating.

Also, I have some of the 2DM860H but only tested on the bench at the minute. however, they seem nice smooth with low motor heating even after being stood for hours. This is always a good sign because lose motor sat on bench is open to resonance and the drive is obviously handling any resonance because nice smooth operation.
Will tell better when put on a machine but so far I wouldn't tell the difference between these and AM882.