Motor Speed advice

Help & Support Robot Parts
1

Hello. Can anyone give me guidance on the best type of motor to use for low speed use, 60rpm? I am tempted to go stepper, as I want to avoid gearbox if i can. Are steppers torque any good at 200 steps/s?

2

Anyone? Apologies if I am asking the wrong sort of questions.

3

Hi Robert,

You are not asking the wrong type of questions, it is a bit hard to answer it without having more informations about your project.

How much torque do you need exactly ?

The faster a stepper will run, the lower his torque will be.

4

I am building a lathe type machine to turn a tube, length 1.5m x 0.3m dia, weight 12Kg. The tube has a 30mm steel spindle supported at each end by a flange bearing. The drive is a chain drive using bicycle chain driving a bicycle chainwheel at one end of the tube. The reduction ratio is approx. 4:1. I want to turn the tube at about 15rpm so a motor speed of approx 60 rpm. The tube will be skimmed by a router, being pushed along a guide, to a depth of about 0.25mm as it turns. I would like to use an arduino controlled stepper motor as a tube drive, to give good low speed torque.

  1. Am I correct in saying for a speed of 60rpm with a stepper use a direct drive, or should i use a gearbox?
  2. What sort of size should I be looking at? I feel that a small NEMA 17 would suffice.
  3. Any other suggestions for motor drive at low speed? (I would like to keep costs down).
5

In order to attempt to answer the question i have on order the following:

23HS22-2804S Stepper motor
TB6600 Driver
24V 20A Power supply

Does this seem like a reasonable combination?

6

Seems ok @Robert72,

It should have enough power and torque.

I’ve read some comments about this motor:

1
1838Ă—83 5.97 KB
2
2841Ă—171 27.6 KB
3
3823Ă—55 5.52 KB
4
4840Ă—142 21.2 KB

Seems like they are all satisfied.

7

Thanks for the reply. I thought instead of pestering people with idiotic questions, I might as well get some stuff and give it a go. I will let you know how it goes, when i eventually get it all assembled.

8

Hi @Robert72!

Don’t ever think you’re asking stupid questions, remember that the only stupid question is the one that is never asked :grinning:

Also, if you are ever struggling to find the motor required for your project you can give the “Drive Motor Sizing Tool” a try, here is the link for it https://community.robotshop.com/blog/show/drive-motor-sizing-tool and here is a tutorial that gives some explanations to the calculations behind the tool https://community.robotshop.com/blog/show/drive-motor-sizing-tutorial

Good luck with your project! :smile:

2 Likes
9

Thanks for the link Geraldine. That will come in handy i’m sure.

1 Like
10

Hello. I got my motor parts, and wired it all up today. And I am pretty amazed at the amount of torque it can generate. SHould be more than enough for my simple application. I don’t havbe it installed yet as I am still working on the mechanics. Thanks again for your assistance everyone.

11

That’s a good news @Robert72 :slight_smile:

We would like to see your project working soon :slight_smile:

12

Lathe finished. I also added a linear drive to move the router…didn’t fancy moving that slowly by hand. It’s great to just take a seat while it does its thing…

13

Great news @Robert72 :slight_smile:
Could we see some photos or a video?

14

OOps forgot the videos…Here’s a link:

2 Likes
15

Nice @Robert72 !

You could create a project in the Robots section, would be great!

1 Like
16

This is actually a sub project of a larger project - building a Carbon Fibre telescope. It is probably too simple for a project really, and it is finished now anyway. The lathe that is.

2 Likes
17

Hi Robert72,

It would probably be interesting to see this as a project anyway.

You could also share your experience and knowledge with people and I’m sure it would inspire viewers.