Electronics > Projects, Designs, and Technical Stuff
Right motors, PSU for CNC mill
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3dgeo:

--- Quote from: Mechatrommer on August 12, 2019, 02:59:03 pm ---... with this post, this thread is now subscribed... ymmv.

--- End quote ---

 :-DD That's the way to subscribe to thread...  :-DD
I really hope I'll build it faster, I have mine designed with 3D, so all I need to do is buy/cut parts and add them together...
I contacted bigger motor seller and asked if he can sell outside of Ebay, Ebay collects way more money then original price is stating and there is no one to ask why – I've had enough with that cap, I'm not buying directly from Ebay anymore...
C and other beams I'll buy from Greece, they sell them cheaper than China and ships them way cheaper and faster.
I'm considering These Ball screws instead of regular lead screws, but I doubt I can fit them without changing the design.
Also I haven't decided on software yet, and for a mill I think 500W will be a bit weak, I'll probably go with 1.5KW.


--- Quote from: langwadt on August 12, 2019, 04:47:19 pm ---as far as I remember 4-5A, they get no hotter than you can keep a finger on them so maybe 60'C

--- End quote ---
I'll probably go with them as well, they look really good on paper.
Mind sharing Your board design?  ::)
langwadt:

--- Quote from: 3dgeo on August 12, 2019, 05:37:24 pm ---
--- Quote from: Mechatrommer on August 12, 2019, 02:59:03 pm ---... with this post, this thread is now subscribed... ymmv.

--- End quote ---

 :-DD That's the way to subscribe to thread...  :-DD
I really hope I'll build it faster, I have mine designed with 3D, so all I need to do is buy/cut parts and add them together...
I contacted bigger motor seller and asked if he can sell outside of Ebay, Ebay collects way more money then original price is stating and there is no one to ask why – I've had enough with that cap, I'm not buying directly from Ebay anymore...
C and other beams I'll buy from Greece, they sell them cheaper than China and ships them way cheaper and faster.
I'm considering These Ball screws instead of regular lead screws, but I doubt I can fit them without changing the design.
Also I haven't decided on software yet, and for a mill I think 500W will be a bit weak, I'll probably go with 1.5KW.


--- Quote from: langwadt on August 12, 2019, 04:47:19 pm ---as far as I remember 4-5A, they get no hotter than you can keep a finger on them so maybe 60'C

--- End quote ---
I'll probably go with them as well, they look really good on paper.
Mind sharing Your board design?  ::)

--- End quote ---

not really, but you are looking at +$100 worth of parts, a 4 layer board, you will also need a stencil
and because of some quirks in how the drivers are controlled it only works with my port of GRBL

So I don't think it would be very useful
3dgeo:

--- Quote from: langwadt on August 12, 2019, 08:17:31 pm ---not really, but you are looking at +$100 worth of parts, a 4 layer board, you will also need a stencil
and because of some quirks in how the drivers are controlled it only works with my port of GRBL

So I don't think it would be very useful

--- End quote ---

Over 100?  ??? What is so expensive?  :o Driver chips – 9 buks a pop, 4layer PCB like 10-15buks a pop, MCU 5/pop, so far  60. Passives and connectors are not that expensive, or I'm missing something? You don't need stencil, can hotair it without it easily.

Tell me more why you picked that MCU, 82 IO 512K mem, 192K ram, 168Mhz seems a bit overkill if you ask me... Why simple STM32F103 is not enough? P.S. dam, LCSC cranked price on those, sad times.....

BTW, how hard would be to integrate ESP32 as an MCU? I'm talking about software side, hardware wise shouldn't be hard at all. That BT or WIFI in CNC would be very cool....
langwadt:

--- Quote from: 3dgeo on August 12, 2019, 11:22:59 pm ---
--- Quote from: langwadt on August 12, 2019, 08:17:31 pm ---not really, but you are looking at +$100 worth of parts, a 4 layer board, you will also need a stencil
and because of some quirks in how the drivers are controlled it only works with my port of GRBL

So I don't think it would be very useful

--- End quote ---

Over 100?  ??? What is so expensive?  :o Driver chips – 9 buks a pop, 4layer PCB like 10-15buks a pop, MCU 5/pop, so far  60. Passives and connectors are not that expensive, or I'm missing something? You don't need stencil, can hotair it without it easily.

Tell me more why you picked that MCU, 82 IO 512K mem, 192K ram, 168Mhz seems a bit overkill if you ask me... Why simple STM32F103 is not enough? P.S. dam, LCSC cranked price on those, sad times.....

BTW, how hard would be to integrate ESP32 as an MCU? I'm talking about software side, hardware wise shouldn't be hard at all. That BT or WIFI in CNC would be very cool....

--- End quote ---

if you are not buying china specials and only building one connectors/passives and enclosure adds up, even from jlpcb etc. PCBs is double that since you can't get less than 5 and if you don't want to wait add the same for shipping

sure you can hot air almost anything, but the powerstep is not a your average package and if you screw it up the board is junk

I used the mcu because I use it in other projects and on a one-of it would be pointless trying so save a few dollars on the mcu

there's a connector for an esp-01, considering all the other things that can go wrong on a CNC I wouldn't want  to share cpu with a wifi stack, I'm not even sure I'd want wifi

3dgeo:

--- Quote from: langwadt on August 13, 2019, 12:29:32 pm ---if you are not buying china specials and only building one connectors/passives and enclosure adds up, even from jlpcb etc. PCBs is double that since you can't get less than 5 and if you don't want to wait add the same for shipping

--- End quote ---
Maybe, not gonna argue with that. But if You would make them in bulk price is way less than 100, one offs is always very expensive.


--- Quote from: langwadt on August 13, 2019, 12:29:32 pm ---sure you can hot air almost anything, but the powerstep is not a your average package and if you screw it up the board is junk

--- End quote ---
Can't imagine how bad you should screw it up to make board useless :) Just watch Lous Rossmann, that dude do crazy stuff with boards and don't screw them up, the secret is to use enough flux  :-DD


--- Quote from: langwadt on August 13, 2019, 12:29:32 pm ---I used the mcu because I use it in other projects and on a one-of it would be pointless trying so save a few dollars on the mcu

there's a connector for an esp-01, considering all the other things that can go wrong on a CNC I wouldn't want  to share cpu with a wifi stack, I'm not even sure I'd want wifi

--- End quote ---
EPS32 has two cores, on for WIFI stuff other for user code, so it should be a variable option.
Anyway, it's a bit too early to talk about control board, first I have to make frame itself :) Tho I'm very thankful for letting me know about those awesome drivers. I was gonna use 3A ones, was't happy about their amperage, but they also had SPI, stall detection and other fancy features.
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