Electronics > Projects, Designs, and Technical Stuff
Right motors, PSU for CNC mill
3dgeo:
--- Quote from: langwadt on August 09, 2019, 01:51:44 pm ---I made this but I doubt many would pay a price for it that makes worth the effort of making and selling
--- End quote ---
Pff, if you don't sell you will never know, put few on tindie and you will see.
I want to make commercial grade board with all the bells and whistles, but only time will tell if I do...
What drivers did You use?
Is that a "mega2560" chip? If so I don't understand why people still use that chip cos there are many way cheaper and way more powerful alternatives.
--- Quote from: David Hess on August 09, 2019, 03:44:49 pm ---I would use the larger motor. The supply voltage can always be raised if necessary to improve high speed torque.
--- End quote ---
OK, thanks, +1point goes for larger motors
--- Quote from: SparkyFX on August 09, 2019, 04:48:24 pm ---What shouldn´t be underestimated is that Aluminium (in general, there are several variants with vastly different properties) is "best" cut with a single flute cutter (given there is no flood cooling that washes chips out of the cutter and on a small machine), which results in higher cutting force per revolution should you aim for normal/higher feedrates. Depending on the cutter you also might need to cut deeper to actually get a working result, the rake angle for alu is steeper than e.g. steel, so experience from working with steel on bigger machines might not be comparable.
Which means for the positioning motors: as big as you can get and highest torque at lower speed. You need the high speed only for the rapid moves, where no cutting forces will slow the machine down. For deep cuts in alu you need a rigid machine or at least a closed loop control, losing steps ruins the experience and work otherwise (meaning you need to slow the feedrates significantly, where you need the torque)
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Well, I can get even bigger motors, but I thin that would be overkill for machine like this. Every workbee I've seen uses smaller motors.
+1point goes for larger motors
Well, I guess in the end bigger motors won :)
langwadt:
--- Quote from: 3dgeo on August 12, 2019, 11:49:10 am ---
--- Quote from: langwadt on August 09, 2019, 01:51:44 pm ---I made this but I doubt many would pay a price for it that makes worth the effort of making and selling
--- End quote ---
Pff, if you don't sell you will never know, put few on tindie and you will see.
I want to make commercial grade board with all the bells and whistles, but only time will tell if I do...
What drivers did You use?
Is that a "mega2560" chip? If so I don't understand why people still use that chip cos there are many way cheaper and way more powerful alternatives.
--- End quote ---
stm32f407 and powerstep01 drivers
3dgeo:
--- Quote from: langwadt on August 12, 2019, 12:12:56 pm ---stm32f407 and powerstep01 drivers
--- End quote ---
Wow, those are really nice drivers.
At what current You are using them and do they become hot after a while with that current?
Mechatrommer:
fwiw... 6040 frame is coming my way... the first bit of pieces i bought for this project was the 500W spindle with psu and few collets acc 2 years ago, and then few NEMA23 and TB6600 drivers. i wont know how they fair up or if they even working, because i never try, they just stayed in the storage all this years. others acc such towline, cables etc also ready, its only which control board that i'm going to use. did a research on the control SW, Mach3 needs payment to get full version license, so does the TeeksCNC? or what the name was, i think can find the free OSS version if i search harder. not really a big deal, i think can mod RepRAP workflow to work with a CNC. i thought i can build my own sturdy table for this, but thinking i dont have necessary tools and accuracy to build one, and i have to buy backlash free threads, bearings, heavy metals for table top or specialized grade A aluminium frame etc thats going to cost me money anyway, so after 2 years of dreaming i just bought the 6040 frame from aliexpress, now i think i've spent 80-90% of the cost, it should be near before i can complete my CNC project.. maybe in the next 1-2 years? ;D my incomplete gigantic 3d printer is there standing outside collecting collosal amount of dust for many more years waiting to be resumed :palm: with this post, this thread is now subscribed... ymmv.
langwadt:
--- Quote from: 3dgeo on August 12, 2019, 01:14:38 pm ---
--- Quote from: langwadt on August 12, 2019, 12:12:56 pm ---stm32f407 and powerstep01 drivers
--- End quote ---
Wow, those are really nice drivers.
At what current You are using them and do they become hot after a while with that current?
--- End quote ---
as far as I remember 4-5A, they get no hotter than you can keep a finger on them so maybe 60'C
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