# Thread: MK1 Steel router build log 1500x800x200

1. Theory : uh was it like ....
(25+25)*sqrt 2 / 230v*235v?? = 72,2 volts
(24+24)*sqrt 2 / 230v*235v?? = 69.4 volts
Goal : 68volts DC

Well, rectifier steals maybe 1 volt (Vf =1.1 volt) ?

Can you please confirm? 24+24 is harder to find.
Ok I am not a math person but I think you might be doing this the wrong way.

25-25 = 50 x 1.414 = 70.07 - rectifier 2 x 1.1 v = 68.5v

Single or double primary no difference, dual primary are easier to find. You won't have any trouble with 25-25 or 24-24 v sec.

Don't forget you are measuring V without load. You also said you have a 25Mtr run

Last edited by Clive S; 28-03-2018 at 09:36 AM.

2. ## The Following 2 Users Say Thank You to Clive S For This Useful Post:

3. Originally Posted by Clive S
Ok I am not a math person but I think you might be doing this the wrong way.

25-25 = 50 x 1.414 = 70.07 - rectifier 2 x 1.1 v = 68.5v

Single or double primary no difference, dual primary are easier to find. You won't have any trouble with 25-25 or 24-24 v sec.

Don't forget you are measuring V without load. You also said you have a 25Mtr run

Hi Clive S ...

I was just compensating for the raised mains voltage 235 vs 230...

I understand leadshine does not manufacture am882 no more ? Where do those am882's come from then?
Any reputable place to buy them ?

So... can one use the uc300 eth with gcode to control spindle speed over 0-10v from the ub1 ?

Is uc software licence bound to the motioncontroller or to the pc hardware?

Grtz Bert.

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4. Bert I have had to much sauce tonight to be of any use. But there are plenty of drives to go for have you seen these:-
https://www.ebay.co.uk/itm/2DM860H-2...72.m2749.l2649

and then you have the AM806 drives

5. Originally Posted by driftspin
Ok worked al little with Fred from BST.

Something changed in their design / stock

Earlier they would ship sealed bearing and sealed blocks... In mine neither are sealed.

Fred agreed to send me new seals block vs ballscrew.

Now waiting for postman

Grtz Bert.

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Ok so Fred is really a good guy,

I received the replacement seals this week.

So now my bearings are protected.

So for anyone that recieved bf bk type bearings from Fred lately.. it dont hurt to check ...
You should have sealed bearings inside or good seals in the bearingblocks.

Grtz Bert.

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6. Bert can you post a pic with the old seals and with the new ones on the bearings?

7. Originally Posted by Nickhofen
Bert can you post a pic with the old seals and with the new ones on the bearings?
Hi Nickhofen,

I can post the before.
I can make a few pictures of the after later today.

Seal vs ring.
Look at the gap between the seal and ring.

And the opened bearingblock.
No seal in the bearing.

Fred explained there was change in his inventorie... sealed and non sealed bearings. And a customer that did not want the bearing block seals to touch the rings because of the resistance this has.

This was a big customer and he had left over stock.

Grtz Bert

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The last picture shows the old seal icw rings from 20mm ballscrew.

And the ring in the bearingblock with a new seal
Last edited by driftspin; 02-04-2018 at 09:47 AM.

8. ## The Following User Says Thank You to driftspin For This Useful Post:

9. Originally Posted by Clive S
Bert I have had to much sauce tonight to be of any use. But there are plenty of drives to go for have you seen these:-
https://www.ebay.co.uk/itm/2DM860H-2...72.m2749.l2649

and then you have the AM806 drives
Yes, Nr1madman has the same steppers from cnc4you as i.

And he actually bought those.
Do those have stall protection? I also have the dual X setup.

I know the am882 is tested and proven, so the safe route.

I have no preference yet. Did not do enough research yet. Guess i settled for the am882.

Grtz. Bert.

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10. Originally Posted by driftspin
Yes, Nr1madman has the same steppers from cnc4you as i.

And he actually bought those.
Do those have stall protection? I also have the dual X setup.

I know the am882 is tested and proven, so the safe route.

I have no preference yet. Did not do enough research yet. Guess i settled for the am882.

Grtz. Bert.

Verstuurd vanaf mijn SM-A320FL met Tapatalk
:D

I don't think they have stalldetect.
And I don't think stalldetect is as safe as everyone says ;)

The 2dm860 seems to have had an upgrade. The one that is linked to have a different cover than mine and seem to have more dip switches than mine with functions that I can only change with software (and cable)

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11. ## The Following User Says Thank You to Nr1madman For This Useful Post:

:D

I don't think they have stalldetect.
And I don't think stalldetect is as safe as everyone says ;)

The 2dm860 seems to have had an upgrade. The one that is linked to have a different cover than mine and seem to have more dip switches than mine with functions that I can only change with software (and cable)

Skickat från min SM-G955F via Tapatalk

Did you go for ac or dc, and why?

Ac 70 volt or so is also a standard transformer.

maybe this one.
https://www.rapidonline.com/vigortro...-0-35v-88-3839

For Dc it says over 100 volts.

Grtz Bert.

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13. I planned for ~68-70v dc but since I got 4 of those drivers I skipped rectifier and caps and just connected ac.
If I had planned for this from the beginning I could have gotten a higher voltage transformer :)

But if the drives turn out to be substandard I can still use my current transformer to make a dc supply for AM882 or EM drivers..

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