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mozzie
Senior Member

Joined: 15/06/2020
Location: Australia
Posts: 276

Posted: 06:49am 21 Apr 2026

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G'day Bryan,
Great to see you are making progress

I think the command you are looking for is PEEK(STEPPER BUFFER)

' prog to test stepper functions

Option default integer

On Error skip
Stepper close

SetTick 200,Show_Pos

Stepper init 0.05,32,,1
Stepper axis x,gp0,gp1,gp5,,200,400,50,5
Stepper axis y,gp6,gp7,,,400,600,100,5
Stepper position home
Stepper run 0
Stepper gc g1 x100 y80 f500
Stepper gc g4 p1000
Stepper gc g0 x0 y0

Do
Pause 100
Loop Until Peek(stepper active)=0 ' wait until motion complete

Pause 250 ' wait for final position update
Stepper close

End

Sub Show_Pos
Print @(100,108),"X-POS = " Str$(Peek(stepper x),-4,4)
Print @(100,120),"Y-POS = " Str$(Peek(stepper y),-4,4)
Print @(100,132),"Buffer = " Str$(Peek(stepper buffer),4)
End Sub

Pretty sure this is the latest version of the Stepper Reference.
Stepper_Reference.pdf

Regards, Lyle.

Bryan1

Guru

Joined: 22/02/2006
Location: Australia
Posts: 1872

Posted: 07:16am 21 Apr 2026

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Hi Lyle yea mate getting the DM556 working today was a huge step in the right direction for me so now I do have to get my head around coding all this up.

Now what I did find when I did those buttons to mimic the stepper limits it clearly states for the same axis the same pins can be used but when I did try that got an error so thats why 6 off in/out pins are used + one for the E-Stop.

As I do have my HDMIUSB board up in the shed now it's right next to the surface grinder so when those DM556's arrive I will have a go with that board as with the mouse and keyboard to go setting up the parameters for the grinder will be a breeze.

Now I do think we can get away from using ball screw on the Y and Z axis and make an allowance in the code for the backlash. But with the Z axis I do think a ball screw should be used as we do want precision when we set the grinding wheel for the cut where just a few step pulses may be needed to get the depth. Also a damper could be installed to beef up the Z axis.

So basically the X axis is just going to going back and forth at a predetermined distance and when it changes direction the Y axis can move the required distance to keep the cutting going, also once the X axis has gone back and forth the Z axis can be incremented down to set the level to get a good cut.

So getting this all my head is one thing now putting all this into code is certainly going to test the grey matter.

Regards Bryan

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