gSender v1.1.2 X0 off by 1/2 bit diameter

gSender v1.1.2
Finally added inductive sensors, return to X0 was off before this change.
Changed EEPROM settings per video for sensors. Soft limits would only let me move a short distance in X and Y so turned that off again and restarted everything.
ALSO turned on “Report In Inches”
Probe bottom left corner of material
Move gantry to random position
Return to XY zero, Y is right on, X is off in the -X direction by half the diameter of the bit used to probe, 1/4" bit. 1/4" V-bit had same results, 1/8" off 0,0 in the -X direction.
Turned “report In Inches” off, re-started everything, re-probed XYZ with 1/4" bit. X0=1/4 of bit diameter (1/16") in -X direction when I hit return to XY zero.
Any settings I need to fix?

Im so glad to hear that someone else is having the same issue as me. Ive not heard anything back from Sienci about a whole host of issues including this one

@Pkaser Have you opened a support ticket? If not, you should.

Yep, but ive heard nothing back

Tinkered with this a little more this morning.
Re-flashed grbl firmware with gSender
Left default firmware settings after re-flash
Changed gSender workspace units to mm
Soft and hard limits off
G56 workspace
Probed with 1/4" Vbit 0.248 diameter
After probe, gSender returned to X= -0.5334 mm, Y= 4.445 mm
Hit return to XY0
Y=off by -0.254
Changed gSender workspace units to inches
Changed firmware to report in inches
Soft and hard limits off
Re-probed with same bit
gSender did not return to zero, returned to X= -0.021"
Y= +0.175"
Hit return to XY0
Y= off by -0.010
Re-flash seemed to help the X0 but Y0 is still off but a lot closer.
New issue though is gSender does not return to XY0 after probing

@RickW since you’re using a v-bit I’m assuming you’re probing with the AutoZero block and probing procedure of ‘tip’?

@Pkaser since I’m already on this thread, I figure I’d also let you know that there are two ongoing tickets you have with us, both are waiting for your response. If your issues for probing are looking similar to Rick’s then feel free to add your own pictures or videos here to help sort out the problem if it turns out you’re both experiencing the same issue


@chrismakesstuff No, I’m using the original probe block. The v-bit is a 3 flute 1/4", similar to a 1/4" end mill. Had the same results also with a 1/4" end mill. It is just easier to see with the v-bit. I have not had a chance to tinker with it since the upgrade to v1.1.3
Edit: v1.1.4

1 Like

@RickW I realize that Chris is handling this, and that I am new to all this, but I don’t understand how a v bit can possibly work to set XY0 using the original touch plate. I have that plate and using a v bit would have the “wide” part of the bit touch the plate to set XY0. We want the point of the bit to be at XY0. How do you input the offset, if you don’t mind passing that along? Do you have a macro that jogs the Mill half the width of the bit in both X and Y?

@alanan @chrismakesstuff I am using the Amana Tool 45624, 1/4" ish all the way to the flutes, no strange bulge. Works perfect for probing, inlays, vcarves, etc. And you can run it faster with the 3 flutes! Also probed it with the Amana 1/4" 2 flute up cut bit just to check and got the same result. Also probed with the 1/4" up cut, removed up cut and replaced with the v-bit, stuffed it up into the router a little farther, and returned to XYZ0 just to check again. So if it was just a 0.250 ish rod, same results. Way easier to see the something-is-off
Also tested this in all of the workspaces related to my jigs with same results. No macros, just standard probe.

1 Like

Understood what you’re doing now. I’ll try to find time to test before end of week and see if anything comes up on my end. Not sure what it can be attributed to since I’ve not heard of the issue elsewhere for general probing being off but perhaps no one is looking too closely at where the bit is returning to? I’ll take a look and see

Thanks @chrismakesstuff
I didn’t notice it until doing a two sided oval bowl (Vectric Aspire) with a 3/16" wall thickness. After flipping the project to the other side (on the Y axis) and running the bottom 3D roughing and finish, the resulting difference was very obvious. If I flip the project on the X axis, the wall thickness is good but the difference causes the side of the board to blow out and come loose on the +Y side. So I started the v-bit testing. Love that bit for speed, fit for inlays, and a nice finish. Very sharp point! Perfect for testing also.

1 Like

Hey Rick, after running testing on our end on Friday we have yet to replicate the issues you’re seeing unfortunately. One thing that comes to mind is that maybe if you reset your gSender settings perhaps that could iron out the value that’s being used to inform the probing procedure? 1/8" is a pretty noticeable amount so it should be something that is being noticed if it’s a general bug and I’ve had a couple other users try probing on their own machines just to check and they also report correct probing. Perhaps you could grab the text from the ‘console’ tab and stick it here and that might show something

I’ve re-read your posts here quite a handful of times and you report probing being off by:

  • 1/8" in -X
  • 1/16" in -X
  • 0.254mm in -Y
  • 0.01" in -Y

I think if the issue were in the fundamental gSender code I’d expect to see more consistency in the probing error - perhaps the stock material isn’t square or mounted square which is effecting the accuracy of the probing?

Thanks for looking into it Chris
I’ll tinker with 1.1.4 in the next couple of days and see what happens. Will post the code if it is still off.