Welcome! Log In Create A New Profile

# Low Steps Per mm - Cause, effect, solution?

Posted by kdsonone
 Low Steps Per mm - Cause, effect, solution? January 10, 2018 05:11PM Registered: 7 months ago Posts: 1
Hello All,

I am building my own 3D Printer - Graber i3. I have followed all the necessary steps to configure the Marline firmware.

I am using the Ramps 1.4 controller board and the A4988 driver. The stepper motor I am using for X, Y and Z axis has 1.8-degree step angle.

I have used the Pursa Calculator to calculate the steps for X, Y, and Z axis - 80, 80, 1600 based on the GT2 pully-belt and 2mm threaded rod - screw system.

ISSUE:

* When I am using the calculated steps for the X, Y and Z axis I am observing higher movement (i.e 10-15 mm when I want to move 1mm)
* I have calibrated the movement by reducing down the calculated steps -
now the new steps are X=6.5, Y= 6.5 and Z = 26.66

1. My question is why I am getting such a lower steps per axis?
2. How can I get more accurate movement without skipping/slipping of the motor?

Thank you

Kunal
 Re: Low Steps Per mm - Cause, effect, solution? January 10, 2018 05:55PM Registered: 4 years ago Posts: 13,547
It sounds as though you don't have the microstepping jumpers fitted underneath the drivers.

Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet.
 Re: Low Steps Per mm - Cause, effect, solution? January 16, 2018 01:11PM Registered: 3 years ago Posts: 246
GT2 timing belt and pulleys should give you values near the 90 steps/mm point with motors that are 200 steps/revolution, and 16X microstepping.

As stated above, check that there are jumpers under the stepper motor drivers on your RAMPS board. Under each A4988 there will be a group of 3 jumpers. If they are all closed (Jumpers present) then you should have 16X microstepping, which will give you the kind of resolution that you're looking for.
Sorry, only registered users may post in this forum.