Welcome! Log In Create A New Profile

upgrading to RADDS and RAPS128, what settings?

unf0rg0tt3n

upgrading to RADDS and RAPS128, what settings?
April 22, 2018 11:26AM

Registered: 5 years ago
Posts: 15

Hi guys,

I recently bought RADDS and RAPS128 drivers, also a second extruder.
Now I am at the part of installing the reptier firmware.
Beffore I break stuff I wanted to know for sure what settings I need to get it up.

should the XAXIS_STEPS_PER_MM be 640? Or do i have this all wrong?
What about the other microstepping settings?

Please help.
Thanks in common!

Edited 1 time(s). Last edit at 04/22/2018 11:27AM by unf0rg0tt3n.

Reply Quote

o_lampe

Re: upgrading to RADDS and RAPS128, what settings?
April 23, 2018 02:45AM

Registered: 8 years ago
Posts: 5,232

The microsteps are 8 times higher than before, so when you had 80 steps/mm before, you end up with 640 steps/mm.
Also you have to invert the enable signal ( compared to other pololu style drivers like A4988 or DRV8825 )
Dialing in Vref is easy. If you find the formula for Vref in the RAPS documentation.... eye rolling smiley

My rule of thumb is 1V Vref ~ 1A stepper current.

Edited 1 time(s). Last edit at 04/23/2018 02:50AM by o_lampe.

Reply Quote

unf0rg0tt3n

Re: upgrading to RADDS and RAPS128, what settings?
April 23, 2018 03:06AM

Registered: 5 years ago
Posts: 15

So:

#define XAXIS_STEPS_PER_MM 80
#define YAXIS_STEPS_PER_MM 80
#define ZAXIS_STEPS_PER_MM 400

has to be:

#define XAXIS_STEPS_PER_MM 640
#define YAXIS_STEPS_PER_MM 640
#define ZAXIS_STEPS_PER_MM 640

??
And just adjust the Amperage on the ground and the V-Ref on the driver to 1V and ground has to be 1A? That's it?

Thanks

Reply Quote

o_lampe

Re: upgrading to RADDS and RAPS128, what settings?
April 23, 2018 01:06PM

Registered: 8 years ago
Posts: 5,232

ZAXIS steps/mm would be 3200 ( 400 x 8 )

Reply Quote

unf0rg0tt3n

Re: upgrading to RADDS and RAPS128, what settings?
April 23, 2018 02:11PM

Registered: 5 years ago
Posts: 15

Quote
o_lampe
ZAXIS steps/mm would be 3200 ( 400 x 8 )

Thanks O_lampe!

I made these settings final:

#define XAXIS_STEPS_PER_MM 640
#define YAXIS_STEPS_PER_MM 640
#define ZAXIS_STEPS_PER_MM 3200

#define EXT0_STEPS_PER_MM 784 //was 98
#define EXT1_STEPS_PER_MM 784 //was 98