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  • spumco
  • spumco
18 Apr 2025 02:00

Determining Angular Scale - Help w/ Microsteps

Category: Configuration Tools

So it looks like the drive is software-configurable.

I'd suggest going back to basics and connecting the drive to a Windows PC and verifying all the drive settings via the drive tuning software.

SIDE NOTE: make sure the motor's encoder count (1000/4000) matches what the drive is expecting.

Set the dip switches to 'software' (i.e. all ON). The reason is that you can (probably) set the microsteps to a useful number in software and are not limited to one of the 200/800/1600/etc values as with dip switches.

This will allow you to set the microstepping to a value that makes the steps per spindle rev a whole number, making the math for LCNC much easier.
Since LCNC's rotary axes units are set in INI [TRAJ] ANGULAR_UNITS = DEGREES, you need the [JOINT_N] STEP_SCALE to be in steps per degree.

For a 3:1 belt reduction and a 1.8deg motor, if you set the microsteps to 2400/rev (12x microsteps), you will wind up with 20 steps per spindle degree.

If you find that 12x is too fine and the positional accuracy is kinda 'ish', you can go down to 1200/rev (6x) and adjust INI to 10 steps per degree.  That might give the drive a bit more of a chance to hit a particular position rather than somewhere close-ish on either side of the target.  Either way you're still below the encoder's resolution so the drive isn't going to be totally guessing on a position.

And while you're in there, you should adjust the drive's following error tolerance.  I've found that Stepperonline's drives have a following error alarm set extremely high.  As in the motor could be 1/2 a full rotation out of position before it alarms out - not OK for CNC use.
  • dlc mnl
  • dlc mnl
17 Apr 2025 23:52
Replied by dlc mnl on topic connections for 7i97t

connections for 7i97t

Category: General LinuxCNC Questions

oh sorry
  • tommylight
  • tommylight's Avatar
17 Apr 2025 23:48
Replied by tommylight on topic connections for 7i97t

connections for 7i97t

Category: General LinuxCNC Questions

No double posting, both topics merged due to attachment missing on one of the topics.
  • dlc mnl
  • dlc mnl
17 Apr 2025 23:43
Replied by dlc mnl on topic connections for 7i97t

connections for 7i97t

Category: General LinuxCNC Questions

20 rdy missing?
  • dlc mnl
  • dlc mnl
17 Apr 2025 23:41
Replied by dlc mnl on topic connections for 7i97t

connections for 7i97t

Category: General LinuxCNC Questions

15 oz+
14 ob+
13 oa+
11 da ground gnda
10 as-
6 brk
5 alm
2 drive disabled cwl
1 aclr
30 oz-
29 ob-
28 oa-
26 as+
23 do com
17 drive disabled ccwl
16 son
31 com+
  • dlc mnl
  • dlc mnl
17 Apr 2025 23:27
Replied by dlc mnl on topic connections for 7i97t

connections for 7i97t

Category: General LinuxCNC Questions

Hello, what connections are needed for the 7i97t?
I have this spreadsheet, and these are the connectors.

has no rdy
 
  • foam man
  • foam man
17 Apr 2025 23:20
Replied by foam man on topic CNC doesn't work with new update

CNC doesn't work with new update

Category: General LinuxCNC Questions

I dont thimk so. when i checked the ini file, there was nothing under Traj, so i added AXES=4, and it worked
  • dlc mnl
  • dlc mnl
17 Apr 2025 23:19
Replied by dlc mnl on topic connections for 7i97t

connections for 7i97t

Category: General LinuxCNC Questions

Is rdy needed?
  • acourtjester
  • acourtjester
17 Apr 2025 21:19
Replied by acourtjester on topic rotary axis queston

rotary axis queston

Category: General LinuxCNC Questions

In the lay out the X arrow is not correct as it is to the negative, not positive as mine is.
So remove the input pins and put 0.0 in the 3 locations you show, I will try that.
In a new config for the Y axis.
Thanks
  • PCW
  • PCW's Avatar
17 Apr 2025 21:14 - 18 Apr 2025 18:46
Replied by PCW on topic Odd estop problem

Odd estop problem

Category: General LinuxCNC Questions

Is the estop input debounced? (software or hardware)

A bare parallel port input will react to 20 or so ns noise spikes
These will occur only occasionally because the likelyhood
of the servo thread reading the input just an the moment of the
noise spike is unlikely. Motor drives make just these sorts of spikes.

Note that while an open switch wire with as resistive pullup will be susceptible
to capacitively coupled noise, a shorted switch wire will be susceptible
to inductively coupled noise.

I would check the routing of the estop wiring to make sure is is not anywhere
near the motor wiring.

If all else fails I would try a RC filter on the parallel port input pin (say 330 ohm and .1 uF at the parallel port itself)
or adding a hal debounce component to the ESTOP signal
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