Re: Which Electronics to Buy
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Re: Which Electronics to Buy
Quote:
Originally Posted by
drxlcarfreak
I finally have decided on which machine I am going to purchase (Fineline 2x4 8020 kit), and THOUGHT I knew about the electronics, but the more I look into it the more confused I get. Is there some kind of primer on which Software, Plugin, Motion Controller. BOB, Drivers work well together? I don't want to cheap out and get components that limit me, but don't want to needlessly spend money on things that I am only using 10% of, or spend an arm and a leg on a pre-assembled kit if I can piece it together for cheaper. I have seen BOBs on ebay for $5, and chips alone that are $150 that need to go into a $100 board.
Does anyone have any input on a decent setup that won't break the bank? I would need 4 axis, the potential for a rotational 5th down the road would be great, I would also like to be able to have limit switches, homing switches and a Z axis tool height alignment switch.
Thanks!
I assume one of your 4 is a clone for a dual ballscrew setup in which case a $5 BOB is fine, I have two of these (1 spare)
https://www.ebay.co.uk/itm/Upgraded-...sAAOSwEOpaAVI6
And it will do everything you want including a rotational axis, needs a PC with a parallel port to work I'm setting up right now with linuxcnc 2.8 so I can square the gantry when homing.
They can be a little confusing to wire up but I can help you they aren't rocket science.
http://www.cnczone.com/forums/attach...d=380186&stc=1
If you look it has all the pins you need to get up and running.
Re: Which Electronics to Buy
So are the more expensive boards to be able to use USB or Ethernet instead of a parallel connection?
http://openbuildspartstore.com/cnc-u...-mk3-4-4-axis/ - I haven't read much on this board, but it appears to remove the need for buying software like Mach 3.
Re: Which Electronics to Buy
That's a Planet CNC motion controller, and the price includes the cost of the Planet CNC software. If you buy from Planet CNC, the Software is 69 Euros, and the board is 119 Euros.
https://planet-cnc.com/products/
Re: Which Electronics to Buy
Quote:
Originally Posted by
drxlcarfreak
So are the more expensive boards to be able to use USB or Ethernet instead of a parallel connection?
You are comparing apples and oranges.
To not use the parallel port, you need a motion controller. Be aware that many motion controllers will still require the use of a breakout board.
Re: Which Electronics to Buy
Ohhhhh!! Okay, that makes sense.
So a motion controller basically just converts USB/Ethernet signal into a parallel port signal that can be split up into the different leads. Do they all have processors in them to handle the transfer as data as well, or is it just like BOBs where some have on board controllers and others are just pass throughs.
So I am guessing that the main advantages are a motion controller creates an electrical barrier between the drivers and computer to potentially save the computer, no need to find an old computer with parallel out, and potentially not needing to buy software such as Mach4. (Does the one I linked not need any addtional software?)
Is the only drawback to a motion controller really the additional cost of the motion controller, which potentially could be partially recouped not having to buy more expensive software like Mach4?
Re: Which Electronics to Buy
Quote:
So a motion controller basically just converts USB/Ethernet signal into a parallel port signal that can be split up into the different leads
Sort of. A more appropriate term for them would be pulse generators. The control software sends low level commands to the controller, and the controller generates the step and direction pulses. In higher end controls, the "motion controller" has complete control of the machine, and the software is just an interface.
Quote:
So I am guessing that the main advantages are a motion controller creates an electrical barrier between the drivers and computer to potentially save the computer
Isolation is actually the job of the breakout board.
Quote:
Is the only drawback to a motion controller really the additional cost of the motion controller, which potentially could be partially recouped not having to buy more expensive software like Mach4?
Mach4 requires a motion controller as well.
Depending on that package you go with, you may or may not have to pay for the software.
There are a couple different types of control systems available.
There are basically two, that generate the step pulses in software, and send them to the parallel port.
Mach3, and LinuxCNC. (Mach4 can, but it's very limited.)
Then you have other controls, where the software does the trajectory and motion planning, but uses an external "controller" to generate the step pulses.
These include Planet CNC, UCCNC, Mach4, and Eding CNC. Mach3 and Linux CNC can also function this way with a motion controller.
Then you have higher end controls that do all the motion control on the board itself, and the software is more of just a front end, or GUI, as the hardware is doing all of the work.
I think that Centroids new Acron board works this way.
Quote:
(Does the one I linked not need any addtional software?)
It requires Planet CNC software, and the license is included in the price.
Re: Which Electronics to Buy
Wow, thank you. This is extremely helpful in figuring out the intricacies of these different options. It seems like the parallel/software step pulse is more older and more prone to missing steps with Windows software interfering than with an external controller?
Is the Planet CNC software decent, or is there a better affordable controller option out there?
Re: Which Electronics to Buy
Quote:
It seems like the parallel/software step pulse is more older and more prone to missing steps with Windows software interfering than with an external controller?
Yes, it's older, but it works perfectly fine for thousands of users.
I've never used PlanetCNC, but people seem to like it. My preference is UCCNC.
Re: Which Electronics to Buy
On a budget, I'd go with the UC400ETH, and either a C10S, or a $10 chinese breakout board. If you need to use both ports, you'll need two breakout boards.
The UC400ETH is only about $25 more than the UC100, and is a much better choice.
I'm using a UC300ETH with a UB1, but the UB1 is not cheap.
Re: Which Electronics to Buy
Awesome, I am going to look into these quite a bit more.
For the rest of the electronics, are these components a good bang for the buck? Is there a better option?
4 Motors - https://www.automationtechnologiesin...23h2100-35-4a/
4 Drivers - https://www.automationtechnologiesin...bit-dsp-based/
1 Power Supply - https://www.automationtechnologiesin...ply/kl-350-36/
Thanks!
Re: Which Electronics to Buy
These drives are two models up from the ones you were looking at, and are on sale for the same price.
https://www.omc-stepperonline.com/st...or-dm860t.html
With these drives, you can go with a 48V or 60V power supply, and get much better performance.
And take a look at these motors, which are cheaper, and have lower inductance.
https://www.omc-stepperonline.com/hy...s33-4008d.html
Re: Which Electronics to Buy
You can use those same drives with Nema 34's, like these:
https://www.omc-stepperonline.com/hy...s31-5504s.html
Without knowing how you are using them, they may or may not be a better choice.
Re: Which Electronics to Buy
Oh, wow. I had assumed that anything that cheap would almost be junk based on other threads I had seen. The machine I am planning is going to be around a 48"x48" machine with an 80/20 gantry, rack and pinion with dual X motors. I just did a quick calculation of the cold rolled steel and 8020 extrusions and am at around 75 lbs for the gantry, so I am guessing the overall gantry would be just over 100lbs.
I plan to use the machine for just about everything. The majority of it will probably be foam/wood/mdf cutting, but I also would like to be able to push through aluminum occasionally. With the 80/20 design, I understand aluminum cutting would be limited in speed not by motors, but more-so by the rigidity of the machine. In general, I like to overbuild things a bit so they hold up better and are a bit future proof. If the Nema 34 can help me cut through wood and foam much quicker, then it would be a no brainer for a small upcharge.
Re: Which Electronics to Buy
Looking again, you have to look carefully at the specs. Those Nema 34's I linked to have a 14mm shafts, while most Nema 34's have 1/2" shafts. Are you using CNCRP Rack and Pinion parts?
Re: Which Electronics to Buy
Quote:
Originally Posted by
ger21
Looking again, you have to look carefully at the specs. Those Nema 34's I linked to have a 14mm shafts, while most Nema 34's have 1/2" shafts. Are you using CNCRP Rack and Pinion parts?
Yes, I believe that Fine Line Automation still uses CNCRP rack and pinion parts. Ahh, that is unfortunate.
Looks like I would be limited to this motor if going to Nema 34: https://www.omc-stepperonline.com/hy...r-mm%5B12.7%5D
It has quite a bit more inductance than the one you previously linked, 8mH. The torque curve actually looks more linear than most of the ones I have seen before up to 1050RPM. Does the inductance make it more of a non-starter though?
Re: Which Electronics to Buy
I'd look at this one. It's similar to the ones that CNCRP sells.
https://www.automationtechnologiesin...l34h295-43-8a/