With the money saved I can get a Donald Trump wig!Quote:
Originally Posted by JAZZCNC
Setting linuxcnc up for dual homing with a hb04 pendant is exactly as much fun as having your teeth pulled lol but get over the hump and all's good ;)
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With the money saved I can get a Donald Trump wig!Quote:
Originally Posted by JAZZCNC
Setting linuxcnc up for dual homing with a hb04 pendant is exactly as much fun as having your teeth pulled lol but get over the hump and all's good ;)
I check the site of cs-lab and it seems that your motion controoller costs 560 euros, this is the cheap one? IT SEEMS THAT I AM DOOMED!!!:sorrow: LOL!Quote:
Originally Posted by cropwell
They are very good though ;)Quote:
Originally Posted by Nickhofen
£5 BOB doesn't seem so bad now lol.Quote:
Originally Posted by Nickhofen
Linuxcnc and a Mesa card is my vote if on a budget
https://www.ebay.co.uk/itm/5I25-Supe...72.m2749.l2649
You can use a cheap BOB to get going (The 5i25 will talk to it directly) and buy a mesa BOB for better performance later (£120) but you probably won't need it.
I can help you get setup as I'm just doing it right now ;) Ask me again in a week if it works lol.
I didn't pay anything like that, it was so much cheaper I couldn't let the chance go by.Quote:
Originally Posted by Nickhofen
lol!!!Quote:
Originally Posted by desertboy
It seems that i mess things up.
I order first two AM882 stepper drive they are on the way and today I discover that they are not the -H version, how bad is that?
Send 'em back !Quote:
Originally Posted by Nickhofen
No problem at all I have 1 AM882 and 3 AM882h the only differences are the h are rated for AC and also for a slightly higher input voltage (100vdc instead of 80vdc)Quote:
Originally Posted by Nickhofen
feed them ~70v dc and they perform identically, I mixed them and I don't know which one is which lol they all fire stall protect fine if I drive the machine to hard and jumper setting are universal between them.
In future I am going to buy 4 AM882h's for a bigger build but I have a spare toroidal transformer that outputs 78v when rectifed which is high for the AM882's but fine for the AM882h's.
One thing I'm sure is just good practise is if you have a dual ballscrew Y axis using 2 AM882's (Or h's) on that axis and not mixing them.
Nick The main difference is that the H version can accept AC input and a higher DC input. It is difficult to find AM882's drive now.Quote:
Originally Posted by Nickhofen
Don't panic they are fine.
Thanks guys for the input,Cropwell I think of that but the shipping cost from here to China is very high unfortunately.
Desertboy that is the first thing that came to my mind ,the other two for the Y axis to be am882h, good input about the voltage rate.
Clive now he only thing I have to concern is that when I receive the Am's and open the box from mail ,not to have two monkeys drives to jump out instead of the real thing,haha!
I believe it is time for me to start building the power supply!
The motors I have are those:
https://www.cnc4you.co.uk/Stepper-Mo...arch=Nema%2023
And the drivers ...well you guys know!:hysterical:
Any diagram to follow and rate of the components for my driver's? Thanks!
See this https://www.youtube.com/watch?v=4OoQ...zD30sZjtp_VyqY Joes vid is goodQuote:
Originally Posted by Nickhofen
Thanks Clive, I was looking for this video,it is from the first I see here at the forum, but couldn't recall who build it and took the video,I am getting old!
Not as old as me but if you need the list of part from Rapid https://www.rapidonline.com/NewProdu...rce=header-bar let me know.Quote:
Originally Posted by Nickhofen
Yes I would love to have it!!!Quote:
Originally Posted by Clive S
OKQuote:
Originally Posted by Nickhofen
1No. https://www.rapidonline.com/vigortro...-x-25v-88-0033
some people use 24-24v secondary depends how high you mains voltage is. I don't know what your supply is? for the primary
3 No. https://www.rapidonline.com/jianghai...-4khrs-59-6175
3 No. https://www.rapidonline.com/lcr-ep08...-clamp-11-3004
1 No. https://www.rapidonline.com/dc-compo...a-600v-47-1012
Test your input before buying a coil
220-240v you want ~50v output before rectified.
240v-260v (I get 252v's in which is very high) get a 45v this will give you ~70v when rectified to DC.
UK used to run at 240v and rest of EU at 220v but it was standardised almost 20 years ago at 230v in reality nothing changed because the leeway allowed on voltage meant that 240v systems fell into the acceptable performance. In Lithuania where the infrastructure has only recently been upgraded I got 230v but I noticed in Berlin I was getting 220v's as the infrastructure pre-dated the 230v regs.
I would bet Nick falls into the 220v-240v zone.
Get 2 rectifiers as they're £1 each too cheap not to have a spare even though they are super reliable, I managed to blow one up with transformer lol.
At home my voltage is ~240v at work it's always over 250v so my theory is they are pumping higher voltages to industrial sites to compensate for the much higher inductive loads on the system.
I read Boran's thread,very good I must say.Quote:
Originally Posted by Desertboy
If I understand correct ,for someone who uses two stepper motors at Y axis,like me,you can not slave one of the motors and save an exit for future use for a 4th axis,right?
Can't you just run the Y axis step and dir to 2 stepper drivers?Quote:
Originally Posted by Nickhofen
Sure there's no dual homing but with AM882's once it's square the stall protect will tell if you if it's out of square although keep an engineers square next to the gantry and it doesn't take long to calibrate.
Nick from what I understand those controllers will not do slave axis as you require. Although you can connect the step output to two drives I would certainly NOT recommend it. You need a controller that will handle dual homing if you intend to use twin motors as it will then square the gantry every time you home the machine.Quote:
Originally Posted by Nickhofen
This is not true. You could be out of square say about 5mm and the two motors would still run also stall detect as I understand it does not work below about 300rpmQuote:
the stall protect will tell if you if it's out of square
So what is happening with the black and yellow monster? :)
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Oh I am busted....haha.
The two am882 are here the other two am882h is on the way,I am waiting also for my toroid transformer to build the power supply.
I can not decide about the bob and motion controller ,I need something to move four motors for now and one more for the A axis in the future.:-(
What are you ruling out?
Several BOBs are 5 axis?
Are there motion controllers that are only 4? (Except the stand alone stuff you talked about above)
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I believe this is the only exception and I can tell that I am leaning towards the uc300 since the DDSCV can not support my four motors and a fifth for a 4th axis in the future,but about bob...I can't decide. :-/
Any suggestions are welcome....:beer:
I have no ideas for you.. I went with the 5$ bob.
Beginning to question if that was a good plan !
All the expensive ones seem good... But expensive ;)
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There must be a solution somewhere in the middle out there..lol
Cheap Bob's are like playing Russian roulette with a nearly full magazine.!! . . . . Long term they are not worth the hassle because at some point they will fail or cause issues along the way which will appear like coming from other areas of the machine. Before I started with CNC I had full head of hair and now I Dazzle planes on sunny day and I blame all on of cheap BOB's.!!!:dejection:Quote:
Originally Posted by Nr1madman
I work at Air Force so I have enough help from my job to grow a bald! Lol!!!Quote:
Originally Posted by JAZZCNC
Any suggestions about a proper bob that I can make it work like a Swiss clock with the uc300 and all that at an affordable price...ops!
Finish the power supply, thanks everyone for the help.
Attachment 24063
Attachment 24064
Attachment 24065
Brill:applause:
It is good practise to not to daisy chain the 70V across each drive ie. use separate power leads from each drive to a common block and then connect the PS to the block. This ensures you are not getting a volt drop to each drive from the first one.
Thanks Clive, I will keep this in mind!!!
That's super tidy, I see you went DC in the end. What voltage output transformer is it? 50v?
I wired the transformer to a 13 amp light style switch and then my VFD and water pump to another switch and both of them are wired from the emergency stop.
This way I can easily turn the transformer on/off and if the vfd is powered the water pump is on. I have both switches and the emergency stop at the front of the machine for easy access in a row.
If I hit the emergency stop it kills power to both the steppers and the vfd, I still have to work out how to get it to trigger an estop on the pc but it's good enough for me at the moment.
Just use a relay with a 230VAC coil.Quote:
Originally Posted by Desertboy
Thank you both for the idea, any wiring diagram will be helpful.
Desertboy you are right it is a 50V output transformer.
Attachment 24070
Nice progress!
Does it feel good to move forwards? :D
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In my case it would be good to get back to where I started - spent the afternoon reassembling my lathe and getting the safety switches operating reliably. Then reinstalled the VFD (when I took it out months ago to fix the broken mounting lugs, I photographed the connections and labelled them as I disconnected each one). Now I am getting a code that says low DC bus. I sense a new thread coming if I can't sort it easily.Quote:
Originally Posted by Nr1madman
I feel that I have so much to do that this looks like a baby step....thanks for the motivation!Quote:
Originally Posted by Nr1madman