NordicCNC's build log

[NordicCnc]

I believe I already answered that in details...

Gah you are right! In post #44 you did answer..

JAZZ, please ignore my repetitive question, and thanks jarjar for pointing out!

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[JAZZCNC]

Nordic: Forgot to say in the previous post when mentioned about higher-level servos requiring higher quality components. That this is also true to lower degree for cheaper servos over a Stepper system.

For instance, with motor coupling used on Stepper, you can get away with more springy coupler and it won't affect the motor in any way. Whereas a springy coupler on even a cheap servo system can cause big issues with tuning the motor. The same goes if using belts and pulleys, buy good quality belts and pulleys.

The stiffer you can make the coupling between motor and screws the better this goes right down to motor mounting. Flimsy motor mounts etc will cause resonance which you'll have to tune out of the system. This isn't always so easy with cheap servo's so the more you can do to limit resonance the better.

[NordicCnc]

Nordic: Forgot to say in the previous post when mentioned about higher-level servos requiring higher quality components. That this is also true to lower degree for cheaper servos over a Stepper system.

For instance, with motor coupling used on Stepper, you can get away with more springy coupler and it won't affect the motor in any way. Whereas a springy coupler on even a cheap servo system can cause big issues with tuning the motor. The same goes if using belts and pulleys, buy good quality belts and pulleys.

The stiffer you can make the coupling between motor and screws the better this goes right down to motor mounting. Flimsy motor mounts etc will cause resonance which you'll have to tune out of the system. This isn't always so easy with cheap servo's so the more you can do to limit resonance the better.

I have never used servos before so I am not familiar with how the tuning works. All I know is that the Delta servos and most of the other servos comes with some auto tuning software. How good auto tuning works I have no idea.

Seems like tuning manually is very difficult and requires a lot of experience to get it right. If you don't know how to do it, the servo system would end up being even worse than a stepper system. I am starting to wonder if I would be better of with a good stepper system instead of diving into the realm of servos.

To me it seems like you favor steppers at for your own builds, but I may have got this wrong. If I am right, I guess you favor steppers for the simplicity and the above reasons?

By the way what would be a good supplier for belts and pulleys? What supplier are you using?

Thanks again for your great insight!


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[JAZZCNC]

To me it seems like you favor steppers at for your own builds, but I may have got this wrong. If I am right, I guess you favor steppers for the simplicity and the above reasons?

Yes exactly for that reason! The machines I build mostly go to MEN in SHEDS type users or small business where the speed or high resolutions etc servos offer isn't needed. Reliability and simplicity are more desirable than speed for these users. Also from my point of view it also means less work and happy customers.

A good properly sized and tuned closed loop system is more than good enough for most builds and far simpler.

By the way what would be a good supplier for belts and pulleys? What supplier are you using?

I use a local supplier.

[NordicCnc]

Yes exactly for that reason! The machines I build mostly go to MEN in SHEDS type users or small business where the speed or high resolutions etc servos offer isn't needed. Reliability and simplicity are more desirable than speed for these users. Also from my point of view it also means less work and happy customers.

A good properly sized and tuned closed loop system is more than good enough for most builds and far simpler.

Glad to hear this actually. Of course it is nice with speed and the non-existent noise! Who would not want 20m/min if they could have it. Anyway 10-15m/min will probably be enough for most small businesses and hobbyist (like me) as you said. I will let this thought about steppers sink for a while before I make any decision. The design is still not finalized anyway so no need to rush things.

You said you are using Lichuan 8Nm 230Vac for the build with the ATC spindle and that you use Lichuan closed loop system nowadays for your build. I checked aliexpress and they are all either 2 phase or 3 phase. So they work with a 3 phase output but uses only 230V? I did not find any 8Nm steppers, but I found this one: https://www.aliexpress.com/item/3279...52606833P16XMw

I use a local supplier.

Okay, I will research area more. I read somewhere that GT2 is supposed to be really good quality compared to the commonly used HTD 5.

[JAZZCNC]

Glad to hear this actually. Of course it is nice with speed and the non-existent noise! Who would not want 20m/min if they could have it. Anyway 10-15m/min will probably be enough for most small businesses and hobbyist (like me) as you said. I will let this thought about steppers sink for a while before I make any decision. The design is still not finalized anyway so no need to rush things.

You can have 20mtr/min speeds with steppers if you choose the right drives/motors along with linear components, the 10x5 vertical machine I've been showing will happily whizz the gantry around at 30mtr/min.

You said you are using Lichuan 8Nm 230Vac for the build with the ATC spindle and that you use Lichuan closed loop system nowadays for your build. I checked aliexpress and they are all either 2 phase or 3 phase. So they work with a 3 phase output but uses only 230V? I did not find any 8Nm steppers, but I found this one: https://www.aliexpress.com/item/3279...52606833P16XMw

Yes, those are exactly what I'm using for Z-axis with 12Nm on X&Y. I think the heading is an error, if you look further down at the spec you'll see it says 8Nm.
This size would be way overkill for your little machine thou. The secret to the speed with steppers, in general, is the relationship between inductance and voltage, but even more so with large motors which is why Mains powered drives work best.

Okay, I will research area more. I read somewhere that GT2 is supposed to be really good quality compared to the commonly used HTD 5.

It's Got nothing to do with quality, that's down to manufacturer and spec. HTD, GT2, etc is the tooth profile. GT2 is actually a modified HTD tooth profile which supposedly offers better handling of torque and speed than HTD.