Galfonz: Steppers loose torque rapidly when turning faster. That's why you can't get
high speed moves when using them.
kmcwhq: How wide is that plywood bench?
Tazrahzeljr: dude...that was actually extremely informative! niccee ive been interested
in cnc for a long time now and i think its time i actually attempt a
asadullahkhan102: AC Servos are the beast in the business, ive seen AC servos used many a
times and theres nothing like them when it comes to power and precision
donbeckham: eod9910, that will depend on many factors such as the gear ratio in the
system, and the max RPM of the stepper. Also, you have to consider the
resistance of the cutting head on the material and the resistance on the
slides. If you talking about just moving the gantry as fast as possible
then you would need to have a motor with enough power to overcome all the
frictional forces plus a little bit more to provide acceleration. The
gantry will continue to accelerate until he stppr gets to max RPM.
Walter Vasquez: Would be possible for you to make a video on how to properly size a stepper
motor. For example if I have gantry of x weight how big a stepper would I
have to have to drive the weight at the desired speed.
jamcat62: There are drivers & motors available that don't require 3phase 220 or 480.
A few of the machines I work with use 120vac supply voltage. And have a
simple usb interface to control the functions. I'd love to buy one of the
machines from my boss, when he gets around to replacing it. But I'd just
fubar it, in converting it from a waterjet to plasma/router. :))
Dan Regalia: I'm using the Ardurino Uno board Revision 3 using L298N Stepper Motor
Driver Controller Board for Arduino. Total power specs: Driven part of the
terminal supply voltage: VMS 5~35V - Driven part of the peak current Io: 2A
per bridge - The logical part of the terminal supply voltage: 4.5~7V - The
logical part of the operating current range: 0 ~ 36mA - Control signal
input voltage range: 4.5~5.5V (high) / 0V (low) - Maximum power
Neo7CNC: Oh yes. I hope to move up to those some day. Thanks
Stoney CNC: Great video - and love your videos. Your CNC platform is very very
impressive. Gecko seem to have midbandresonance damping in their driver DSP
to compensate for stepper resonance. Great stepper motor info on the Gecko
site. I assume the Keling and Leadshine etc's do something similar. The
servo-stepper is a good new technology. DG4S-016035 - DC Servo Drive allows
step and pulse signals to control servo
adisharr: Just an FYI, the servo you're using for comparison is very high performance
and really not in the same performance category as a standard stepper. That
servo motor / drive probably costs around $ 1-1.2K Also, servos aren't
always the best option for machining applications in smaller mills as they
are error followers. A stepper is not and will be very accurate unless
pushed out of it's capabilities. Note that I'm talking about a lower cost
hobby grade servo motor / drive.
Franvia.net: Friend could tell me the price of the engines by step in your country?
Neo7CNC: @Marcelmx3 Great information. Thanks for posting.
Luis de Rivas: The G540 is an integrated 4 axis controller, which means it has 4 drivers.
A better comparison is the G201 which is for a single axis, like the
KL-5056. Beware, not all drivers are alike. Some feature galvanic/optical
signal isolation, some have varied digital micro-stepping capability and
the maximum current limit will also be a great factor in the cost of a
driver. For example the KL-6050 is $50 with no micro-stepping & handles up
to 5 amp motors. The KL-9082 is $109 @ 8.2A max & w/micro-step
Franvia.net: which is better. stepper or servo motors?
Neo7CNC: What driver are you running?
donbeckham: Most systems use a gear "reduction" so the smaller motor can provide
greater forces to overcome the resistance in the system. But this is at the
expense of speed due to the max RPM of the motor. If you want speed, you
use a stronger motor and less gear reduction or the same gearing ratio with
a higher RPM motor. You can even go with high torque motor and overdrive
the gear system and really make things fly! :)
Neo7CNC: I haven't used the Gecko drives but from what I've seen they are some of
the best. I have seen them used in midline production CNC machines. Small
business and prosumer types. My drivers are Keling KL-5056. Thanks for
jbattin83: You sir... are the man. Thanks for your help!
UrTRaBBiTT: Hi mate, I really like your video's and you have done a great job with what
you have had to work with, ignore the hater's. Can you tell me as a person
who has no idea about the driver boards and so on, can you recommend a good
driver board for a 3 axsis cnc. do I need 3 driver boards and what else for
that side of things, im using it for wood and light aluminium.
Neo7CNC: Awesome info. As I tip toe towards a new machine I'll have to dig into all
the current tech. Thanks for watching.
Dogfrost9: Hello, When you were talking about typical pricing for stepper drivers vs.
Servo drivers, you said around 2 or 300 range for servo and 60 for stepper.
In my research for a good Stepper motor/driver system I have been seeing a
lot about Gecko G540 Driver for use with Nema 23 Stepper motors, however
JUST the Gecko G540 stepper driver on ebay sells in the $250 range. Do you
know anything about the G540 and why it is so much more expensive than the
$60 driver you used? What driver was that btw
Dan Regalia: Quick Question... I have a 2.5a Stepper, but my drivers are only 2a. Should
I be using an external powersource for it?
Neo7CNC: Thank you very much. Very kind of you. Thanks for watching.
Amra: For focus issues, set the focus to fixed/manual [or turn off autofocus] and
select the approximate distance from desk to the camera from the menu [if
digital], or manually set the focus [is dslr/video camera].
José Yovany Luis García: If the amperage is a problem, you could build yourself (if don't want to
spend) a controller based on a Mosfet H Bridge, you can use an IRF Mosfet
and it would be able to handle much more amps...
Neo7CNC: Thanks for the information. I need all the help I can get.
Neo7CNC: Such a short question needs a very long answer. As always, it depends on
many things. There is no straight answer. They both have strengths and
weaknesses. Servos cost more and use more power in general. They are closed
loop and maintain position usually. Steppers are cheaper, require less
power, and are easy to find. I could go on. Thanks for watching.
Neo7CNC: I want to think as long as you don't push to hard or overload it you'd be
fine but I always try to error on the side of caution. So if your worried
about smoking it I wouldn't try it.
Karadjordje Trkulja: Great and helpfull video. Thank you sir. And now I can seartch for stepper
motor. I want to build my first 3-axis CNC Milling machine 70x100cm working
area. For my first CNC I think that steppers are good choice.
drez20001: Thanks for all of the information. I've wanted to put together a CNC
machine for use in my shop for years but due to the large expense of one
never did. I've been going over plans and videos to learn how to build one.
Your videos are extremely helpful.
Neo7CNC: @Bojanpzs1 Yes. My NEMA23 425oz steppers on my CNC are Bipolar.
donbeckham: But, addressing your question, if you want to know the min torque required
to move your gantry assuming it's already built, tie a string to the gantry
perpendicular to the liner vector, run the string through a large diameter
ball bearing pully mounted to the wall or other stable object, and start
hanging weights on the string until the gantry starts to move. That's the
amount of torque your stepper will need to overcome the resistance in the
system with no mechanical advantage (gear ratio).
Bojanpzs1: Can i use Bipolar stepper motors for my homemade Cnc? (for X,Z,Y axis)
(using it to cut plastic an maybe some 1cm wood)
Homemade DIY CNC Series - Steppers and Servos - Neo7CNC.com - Episode 45
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