test simtools+stepmotor

Hello @mariano68 yes i changed the splind step i was using 4mm/per revolution, and now i'm using 10mm/per revolution

Hello @noorbeast Thank's for the inrfomation, a check the threads and now i set to 20% (pitch, roll, surge, sway and heave), and adjust the values manually in the tuning center, I will post a video later. Thanks

Hello @SeatTime the noise is because this motor's are little bit big, if I take nema 23 the small step motor you have less noise.

@Bordiin I don't know much about that kind of motors, how much RPM they can get?
Based on some screw calculator, it gets me that you don't need more than 1.5NM to move your sim, even with 10mm pitch, so a Nema with that power will do the job if the rpms are enough...

@mariano68 i don't know with sure because It depends of the number of pulse you program in the drive, i belive that it's arround 5000 rpm like a servo motor, but this kind of motor with you increase the speed you decrease the torque, so we use a nema 34 (http://www.kalatec.com.br/motor-de-passo-5034-349) with 3.15Nm.

how are you driving the motors? moto monster driver?

again, nice nice actuators

fer

@ferslash no, i'm using a drive to step motor, but i don't know if the moto monster can control step motor, with he can, it's possible because my program send pulse and direction.

yes you are tottaly right... just now, i undertand that steppers need a different driver

@ferslash i looked for information about MM's of sparkfun but i didn't find much, but i find this module is like a MM's but to 4A, and it's possible connect the step motor, but we need change the arduino program because to work we need to send commands in (A - A/ - B - B/) , i thinks it's better use a driver to stepper motors.

Hello Bordiin,
you have totally right. The stepper drivers you use have sinusoidal outputs and automatic idle-current reduction (for holding positions) and the motors need up to 48V. That can't be done with a MM.

A driver for a stepper motor costs 10 times more than a MM or any other Chinese driver, so, if someone can do a code that works with a stepper and some cheap driver could be of great help, as "I" (repeat "I" ) don't see much interest to use a step plus a driver plus a gear box, when that combo costs like 3x a simple 12v motor (plus that whining sound).
Sorry I don't want to sound harsh, English is not my first language.

@mariano68 no problem english is not my first language too, i'm using google translate. I understant your point, but i want to build a something new
MM's to bring to brazil is about R$ 200,00 or more, the drive to stepper motors is like R$ 300,00 but this one that i'm using is for 9A my motor use 4A, i can change that for one cheaper, same with the motors, but the weight that stepper motors support is 10 times more than a simple 12v motors, and whining sound you need adjust the right frequency and you not heard the motors + the headsead or speakers, you forget the whining.

I know, we are neighbors
U$S64 for a chinese MM? Has to be the MM mais grande do mundo! (kidding!)
We have similar problems/difficulties to get good motors and electronics, that make us to be creative, and what you are doing is really great, I hope I can get good use of it for sure!
BTW, based on this formula I need a 1.2NM and 2500rpm motor to get 60kg. lifted at 416mm/s. Wich Nema I have to get?

I contact the brazilian company that sell stepper motors and the max rpm is about to 1200 a little bit more, but you loose torque.
I'm using nema 34 with 3.4NM and my drive adjust give me 100mm/s, i test with 90kg and works fine. i don't know with we really need 416mm/s.
You can use Nema 23 it's a small motor with 1.86NM, i think that this motor is enough.

For a race sim, the faster the better. 200mm/s is a good number I think.

I will creat a test i'm my arduino progam and i tell you the exactly how much my motor move.i need finish my mechanical modifications firts

Hello @mariano68, i test this morning and the max speed i can reach is 125mm/s more this i started to lose torque, i'm finishing the mechanical adjust and will make a video, but i'm think that is ok with this speed.

Looking really good.
I think 125mm/s with a good profile will be nice.
Looking forward your next video!

HEre my last video

That's much better! Looks fast enough! Great achievement
You just need to stiffen your structure to get better movement transfer.
So you're using 10mm pitch, and what is the diameter of the screw?

Yes 10mm and diameter is 16mm.

I found this video on youTube that shows the sizes of the various common stepper motors.
The little one is a NEMA17 witch is used in the SCN5 actuators, the middle one is a NEMA23, used in the SCN6 actuators, and the big one is a NEMA34, used here by Bordiin. Now you can estimate how strong this rig must be. I thought this might be interesting.