Homemade DIY CNC Series - Steppers And Servos - Neo7CNC.com - Episode 4




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marshalcraft: hey neo7cnc ive just broke ground on my cnc project by purchasing a rotating tilting table that i intend to convert to cnc for a 4th and 5th axis. any suggestions for servos as i do not know to many brands. i only have 120 v so would probably have to do some kind of voltage converter or something however the table is geared for 1 rotation to every 90 rotations of the worm shaft so i dont think much power is needed. do they make 120 v servos or am i going to have to look into a converter of some sort, or moving.

Steven Reynolds: Hi, thanks for some great advise, just been looking at some steper motors for my CNC build (23KMK04499V P14288) wonderd if you think they would be ok (thier 24 v as difficult to find 48v here in uk, and what would you surgest for main motor as I have no idea Thanks Steve

jimlovesgina: This is a great "Here is what you can do" series of videos. I would love to see a "Here is what I did" series of videos with a set of plans. Something that already works well would be great for avoiding the costly mistakes of designing one from scratch. The result would be a router that works. Your plans could always be modified to include a different option that you are discussing but knowing that a working router is the end result is huge peace of mind for anyone deciding to commit to building it.

Ron Edmeades: Great video. I would be interested in a video describing how to choose the size of your stepper/servo motors. Being a novice when it comes to cnc machine design it's one of the difficult topics. 

Иван Козловский: Я ОДИН

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 control..

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 consumption: 20W

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 watching.

jbattin83: You sir... are the man. Thanks for your help!

Au.RaBBiTT .UrbanTerrorPro: 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: Thanks!

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.

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 design! thanks!!

Galfonz: Steppers loose torque rapidly when turning faster. That's why you can't get high speed moves when using them.

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.

kmcwhq: How wide is that plywood bench?

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)
Rating:
Homemade DIY CNC Series - Steppers and Servos - Neo7CNC.com - Episode 4 4.9 out of 5

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Homemade DIY CNC Series - Steppers and Servos - Neo7CNC.com - Episode 4