after setting 0 home on my work piece and running the outline step it doesn’t return to the same location it off quite a bit. i have tried this on a couple different files with the same results
Does gSender indicate that it is at [X 0, Y 0] at the end of the outline? I guess my question is whether the zero position actually changed or the machine just didn’t end up where you expected? I have never used the outline feature but I see no reason that it should necessarily end at the same position that it started at.
The true test would be to set home and then run then outline and then use the ‘Go to’ buttons to return to zero. If that is still in the right place you are good to go.
1 Like
I’d agree with @_Michael, by the way great name @rpdjr59 
If it’s not going back to where it started, you might want to look at bumping down your velocity and acceleration values in the Firmware settings. There have now been enough reports of this issue that we’re also now shipping an updated firmware with slightly lower default values for velocity and acceleration to address the occasional instances that have popped up from this, the new version is available for download here:
I thought of something else but it’s hard to say without a value for ‘quite a bit’. If there is play anywhere in the drive train the position of the bit can change by the amount of play based on the direction of the last move.
For example, lets just assume X moves with some play in the anti backlash block on the X axis. If the machine was moved to the right, zero set, then moved farther to the right and returned to zero by a move to the left. The result of this sequence would be that the bit is off by the amount of play. I would expect this value to be small but small and ‘quite a bit’ are relative values so it’s something to consider.
I check my drive train for play by grabbing a part that moves and trying to wiggle it back in forth in the directions it moves. If there is play you should be able to feel and hear it if it’s quiet. I try to move the X carriage left and right to check the X axis. For the Y I try to move the X gantry plates at either end of the X gantry forward and back one at a time.
You can get play from anything that’s loose but anti backlash blocks, wheels, and the nut that tensions the lead screws are probably the most common culprits.
Just some food for thought, good luck resolving your issue.
thanks for the suggestion i have checked for any play by pushing on the x and y arises i also loosened my backlash bolts they seamed to be a little tight I’m going to upload some links to some videos i made of how it’s running and the log from the attempt tonight.
@rpdjr59 Just and FYI, none of the links work for me. The first link takes me to a list of pic links. Clicking on any of them simply takes me back to the first link.
sorry about that I’m new to this and will try doing it tomorrow
@rpdjr59 No worries. I don’t believe that I will be of any help, but your pics may help others to offer advice.
click on the I think I got it link hoprfully you can see the videos
Longmill log 10/30/24
X268.5204Y34.6274
X266.5066Y36.9522
G2X251.1998Y79.4192I51.1216J42.4184
G1X251.1992Y79.4594Z-9.5376
X251.2444Y81.9880Z-10.3279
X251.3858Y84.5149Z-11.1188
X251.6234Y87.0346Z-11.9097
X251.9564Y89.5416Z-12.7000
X252.3856Y92.0392Z-12.7000
G2X266.4084Y121.8512I65.2795J-12.5019
G1X266.4253Y121.8728
X268.5204Y124.2914
X270.6752Y126.5516
X270.7275Y126.6064
X273.0425Y128.8135
X275.3673Y130.8273
G2X317.8745Y146.1347I42.4218J-51.1284
G2X360.2663Y130.9255I0.0780J-66.4658
G1X360.2878Y130.9086
X362.7065Y128.8135
X364.9666Y126.6587
X365.0215Y126.6064
X367.2286Y124.2914
X369.2424Y121.9666
G2X384.5498Y79.4594I-51.1284J-42.4218
G2X369.3406Y37.0676I-66.4658J-0.0780
G1X369.3237Y37.0461
X367.2286Y34.6274
X365.0738Y32.3673
X365.0215Y32.3124
X362.7065Y30.1053
X360.3817Y28.0915
G2X317.8745Y12.7842I-42.4218J51.1284
G2X275.4827Y27.9933I-0.0780J66.4658
G1X275.4612Y28.0102
X273.0425Y30.1053
X270.7824Y32.2601
X270.7275Y32.3124
X268.5204Y34.6274
X266.5066Y36.9522
G2X251.1998Y79.4192I51.1216J42.4184
G1X251.1992Y79.4594Z-12.7126
X251.2444Y81.9880Z-13.5029
X251.3858Y84.5149Z-14.2938
X251.6234Y87.0346Z-15.0847
X251.9564Y89.5416Z-15.8750
X252.3856Y92.0392Z-15.8750
G2X266.4084Y121.8512I65.2795J-12.5019
G1X266.4253Y121.8728
X268.5204Y124.2914
X270.6752Y126.5516
X270.7275Y126.6064
X273.0425Y128.8135
X275.3673Y130.8273
G2X317.8745Y146.1347I42.4218J-51.1284
G2X360.2663Y130.9255I0.0780J-66.4658
G1X360.2878Y130.9086
X362.7065Y128.8135
X364.9666Y126.6587
X365.0215Y126.6064
X367.2286Y124.2914
X369.2424Y121.9666
G2X384.5498Y79.4594I-51.1284J-42.4218
G2X369.3406Y37.0676I-66.4658J-0.0780
G1X369.3237Y37.0461
X367.2286Y34.6274
X365.0738Y32.3673
X365.0215Y32.3124
X362.7065Y30.1053
X360.3817Y28.0915
G2X317.8745Y12.7842I-42.4218J51.1284
G2X275.4827Y27.9933I-0.0780J66.4658
G1X275.4612Y28.0102
X273.0425Y30.1053
X270.7824Y32.2601
X270.7275Y32.3124
X268.5204Y34.6274
X266.5066Y36.9522
G2X251.1998Y79.4192I51.1216J42.4184
G1X251.1992Y79.4594
G2X251.9564Y89.5416I66.4658J0.0780
G2X266.4084Y121.8512I65.7086J-10.0042
G0Z6.3500
G0X0.0000Y0.0000Z50.8000
M5
G0Z50.8000
G0X0.0000Y0.0000
M2
Hey rpdj,
Watched the first vid at the ithinkigotitlink and I can hear your machine stall two times pretty much on the same spot in the outline cycle.
I think that if you tune down the xy- speeds a bit as sugested above, you are prolly able to run more stable outlines. (And jobs)
1 Like
The updated file is it 5.0.11? My SLB is ruining 5.0.5b now.m
@rpdjr59 According to the Sienci site, the latest firmware for the SLB is 5.0.5b. You are confusing that with the latest file for the SLB-EXT, which is the AltMill controller. That controller’s latest firmware is 5.0.11.
1 Like
OK 5.0.5b is correct. Make sure you send the command “$rst=$” in the console then turn off the board with the power switch at the back and turn it back on again. That should revert all your settings correctly. Then you can try again and see if you get the movement you expect 
EDIT: I’ll move all your links back into here since it’s quite disorganized - just to help you with getting help
thanks for the help with those links my first time doing that. so I entered the command and powered off and on it did set the settings and I tried to run a outline and the same thing happened again. I went into the firmware and lowered the acceleration this time I went to 500mm/sec on the X<Y, and A, then I homed and setting up to do a cut with the probe to set my origin pick the same file and did a outline and it ran well and returned to the origin. I did that twice. So I went beck into the firmware and raised it to 700mm/sec with the same results. tried one more time, setting the acceleration to 650mm/sec and it seam to be fine smooth and returned to my origin point. do you think this is ok? or am I going to have a problem? I also copyed the log for these set I did tonight if you would like to see them.
@rpdjr59 if you have to set the values that low, there might be some other mechanical issue with your machine. For instance:
- v-wheels too tight
- anti-backlash nuts too tight
- anti-backlash nuts misaligned
If you reduced the settings and it seemed to work, then you can probably get away with doing it as the easiest fix. If I were you, I’d use the lower values since if you try to raise them up too high then you’ll risk your machine losing position while cutting (since forces are higher while cutting). In the long run though I’d suggest taking a look at the mechanics of your machine. A good test is to see if you can turn the lead screws with your fingers, and if not then look through the different components until it’s moving more smoothly again. I only say this because I’ve never heard of someone having to put their settings that low.
How that all makes sense, but if you need me to elaborate more, myself and other on the Forum are quite experience with this sort of thing
thanks for the info I have look at the machine and I can move the lead screws by hand with out much trouble, also I loosened the anti backlash bolts and tightened them but not as tight as they were that helped the sound of the machine when running. I will do some cutting and see if things change. I want to thank everyone for there help.
2 Likes