# Thread: Need help on calculating steps

1. ## Need help on calculating steps

Just like title says, I need help on figuring out steps for my x axis for my router(still in building stage). I didnt have any problems with my z, but x is giving me headaches.

I'm using Keling steppers, which then connect to 16 tooth 5mm timing gear which than belt drives 48 tooth gear which than turn 20 tooth spur gear which moves the gantry on gear rack.

So i would really appreciate help with calculating steps for this setup so i can start playing with motors turning

The gear rack has 5 teeth per inch(i believe). The drives are currently set for 1/8 microstepping.

Thanks in advance for any help!

2. I get 1200 microsteps per inch.

Thats a pretty big pitch for the rack.

Greg

3. Here is what i'm getting:

200*8=1600

1600/3(3:1 ratio)=533.333

Than this is where i get stuck, the 48 tooth pulley needs to move 1/4 turn to make spur gear move 1".

So do i devide 533.3333 by 4? doesnt the number of steps seem low? my Z axis steps are at 16000, and this is coming out to be ~133.33

4. Originally Posted by Greolt
I get 1200 microsteps per inch.

Thats a pretty big pitch for the rack.

Greg
yea, its kind of slight overkill, but it was cheap

5. also how do you get 1200?

6. The rack is 20 PA, 16 Pitch if that helps

7. 200 x 8 = 1600. Steps per rev

1600 x 3 = 4800 . 3 revs of stepper for 1 rev of pinion

4800 / 4 = 1200. This is your 4 inches per rev of pinion divided by 4 to get 1"

I only have info on metric gear so not sure about the pitch here.

Greg

8. Originally Posted by Greolt
200 x 8 = 1600. Steps per rev

1600 x 3 = 4800 . 3 revs of stepper for 1 rev of pinion

4800 / 4 = 1200. This is your 4 inches per rev of pinion divided by 4 to get 1"

I only have info on metric gear so not sure about the pitch here.

Greg
Would it be beneficial to me to use 1/16 microstep setting?

9. Microstepping is not really to be depended on to increase resolution. It is more to help the motors turn smoothly.

It has diminishing returns and more than 10 generaly does not have much value.

I would look at maybe using a smaller pinion. Maybe 20 or 24 tooth

10. Well, i'm have 20 right now...

But what kind of resolution should i expect from setup like this?

11. OK I was thinking you had a 48 tooth pinion

1200 microsteps per inch is 0.00083" approx per microstep.

Or more realisticaly 0.0067" per full step.

IMO perfectly fine for a plasma cutter.

If you have not purchased the pulleys yet then consider 15 and 60 which will give you 4 to 1 reduction.

Greg

12. I already have all pulleys/gears for my router table(not plasma)

Here are few pics:

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