# ❓ Something's Up **URL:** https://forum.sienci.com/c/support/issue/42.md?page=2 [Latest](https://forum.sienci.com/latest.md) · [Categories](https://forum.sienci.com/categories.md) **Page:** 3 --- ## [Need a little help](https://forum.sienci.com/t/need-a-little-help/26529)
**Author:** [@Blink](https://forum.sienci.com/u/Blink)\ **Replies:** 5\ **Last updated:** [June 9, 2026, 4:47pm UTC](https://forum.sienci.com/t/need-a-little-help/26529 "2026-06-09T16:47:06Z")
Just assembled my Altmill 2x4. Turned everything on. My Gsender computer says disconnected at the top? Have a feeling this may first of a few questions. Thanks in advance Bill --- ## [Stepper motors ‘hissing’](https://forum.sienci.com/t/stepper-motors-hissing/26539)
**Author:** [@guy559](https://forum.sienci.com/u/guy559)\ **Replies:** 7\ **Last updated:** [June 8, 2026, 6:07pm UTC](https://forum.sienci.com/t/stepper-motors-hissing/26539 "2026-06-08T18:07:29Z")
New AltMill 2x4 user here. Assembly went well overall and machine operates as expected so far. Still dialing in some things as I schedule around travel. Only oddity so far is the hissing coming from the Mk2’s closed-loo… --- ## [Altmill parts specs](https://forum.sienci.com/t/altmill-parts-specs/26523)
**Author:** [@wiremonkey](https://forum.sienci.com/u/wiremonkey)\ **Replies:** 0\ **Last updated:** [June 4, 2026, 8:21pm UTC](https://forum.sienci.com/t/altmill-parts-specs/26523 "2026-06-04T20:21:35Z")
Hey folks, I think I need a new X axis ball nut, it sounds a bit crunchy when it rapids. I’ve kept it well greased, but maybe some grit got in there? I’m hoping the screw itself is OK. So, is there a place anywhere on t… --- ## [Altmill keep disconnecting from computer](https://forum.sienci.com/t/altmill-keep-disconnecting-from-computer/26337)
**Author:** [@GPeak](https://forum.sienci.com/u/GPeak)\ **Replies:** 14\ **Last updated:** [June 3, 2026, 9:39pm UTC](https://forum.sienci.com/t/altmill-keep-disconnecting-from-computer/26337 "2026-06-03T21:39:57Z")
Hi. My mill keeps disconnecting from my computer. It is connected via USB. Which ethernet cable will work? Is it a special one. I just have been reading that might be the problem. But, it is useless if I can’t run more t… --- ## [New SLB same problem](https://forum.sienci.com/t/new-slb-same-problem/26479)
**Author:** [@PBA](https://forum.sienci.com/u/PBA)\ **Replies:** 6\ **Last updated:** [June 3, 2026, 3:43pm UTC](https://forum.sienci.com/t/new-slb-same-problem/26479 "2026-06-03T15:43:06Z")
I ordered a new SLB to save me some time and I thought maybe the first SLB would be repairable and I would build another machine someday. The new SLB is giving me the same fits. I received the new SLB last night. This mo… --- ## [Failure never fails to hit me...so frustrating](https://forum.sienci.com/t/failure-never-fails-to-hit-me-so-frustrating/26483)
**Author:** [@4thbboy](https://forum.sienci.com/u/4thbboy)\ **Replies:** 11\ **Last updated:** [June 3, 2026, 12:11pm UTC](https://forum.sienci.com/t/failure-never-fails-to-hit-me-so-frustrating/26483 "2026-06-03T12:11:30Z")
Updated to gSender 1.6.2. Now whatever job I run the spindle starts up, the VFD shuts off the controller. I went back to 1.6.1, still the same result. EVERY time I take one step forward, I fall backwards with this thing… --- ## [Issue with Autozero TouchPlate](https://forum.sienci.com/t/issue-with-autozero-touchplate/26100)
**Author:** [@Jimc137](https://forum.sienci.com/u/Jimc137)\ **Replies:** 28\ **Last updated:** [June 2, 2026, 8:45pm UTC](https://forum.sienci.com/t/issue-with-autozero-touchplate/26100 "2026-06-02T20:45:10Z")
I suddenly got a weird issue with my AutoZero touch plate and hope someone can help. I’m using gSender 1.5.7 with my Altmill. When I go to set “Z”, I place the touch plate on my stock, hit “Probe”, with it set to “Z” on… --- ## [E Stop Button Problem](https://forum.sienci.com/t/e-stop-button-problem/26491)
**Author:** [@HonestKnifeCo](https://forum.sienci.com/u/HonestKnifeCo)\ **Replies:** 10\ **Last updated:** [June 2, 2026, 1:30pm UTC](https://forum.sienci.com/t/e-stop-button-problem/26491 "2026-06-02T13:30:32Z")
Altmill 2x4 MK2 with SLB Superlongboard and Sienci 1.5KW Spindle, Gcontrol and Gsender. All working fine and suddenly in the middle of a job, I get an E stop error. When I restart and activate the E stop, I get a beep … --- ## [Error 15 when jogging](https://forum.sienci.com/t/error-15-when-jogging/16948)
**Author:** [@Chrisp](https://forum.sienci.com/u/Chrisp)\ **Replies:** 12\ **Last updated:** [May 29, 2026, 8:49pm UTC](https://forum.sienci.com/t/error-15-when-jogging/16948 "2026-05-29T20:49:39Z")
I’m consistently getting an Error 15 when pressing the jog button while the soft limits are enabled. A single click works fine. This only happens when soft limits are enabled, even after homing. This happens on both gsen… --- ## [Altmill 2'x4' Spindal not turning](https://forum.sienci.com/t/altmill-2x4-spindal-not-turning/26477)
**Author:** [@Groucho194](https://forum.sienci.com/u/Groucho194)\ **Replies:** 6\ **Last updated:** [May 29, 2026, 8:37pm UTC](https://forum.sienci.com/t/altmill-2x4-spindal-not-turning/26477 "2026-05-29T20:37:28Z")
Have an Altmil2’x4’, G sender and Vetric. Ran a file yesterday. Shut everything down correctly. Restarted today. Same file hit run and everything worked but the spindle is not turning. Controller says ro.oo. What am I do… --- ## [GSender Z-probe goes up to endstop instead of probing downward](https://forum.sienci.com/t/gsender-z-probe-goes-up-to-endstop-instead-of-probing-downward/26459)
**Author:** [@Fonzie](https://forum.sienci.com/u/Fonzie)\ **Replies:** 2\ **Last updated:** [May 27, 2026, 1:14pm UTC](https://forum.sienci.com/t/gsender-z-probe-goes-up-to-endstop-instead-of-probing-downward/26459 "2026-05-27T13:14:06Z")
Good day, I’m trying to switch from UGS to GSender, but I’m having an issue with the Z-probe function. When I initiate probing in GSender, the Z-axis moves upward until it hits the endstop and then stops, instead of mov… --- ## [Machine Y axis noises](https://forum.sienci.com/t/machine-y-axis-noises/26426)
**Author:** [@Crazy8sCommando](https://forum.sienci.com/u/Crazy8sCommando)\ **Replies:** 7\ **Last updated:** [May 23, 2026, 5:44pm UTC](https://forum.sienci.com/t/machine-y-axis-noises/26426 "2026-05-23T17:44:47Z")
Now that I’m getting used to this thing running, I have a question about noises coming from axes movement. I’m noticing that my Y travel is loud compared to my X and Z movements, and I’m wondering if that’s common? I a… --- ## [No axis movement](https://forum.sienci.com/t/no-axis-movement/26430)
**Author:** [@PBA](https://forum.sienci.com/u/PBA)\ **Replies:** 5\ **Last updated:** [May 22, 2026, 2:23am UTC](https://forum.sienci.com/t/no-axis-movement/26430 "2026-05-22T02:23:36Z")
Good day all! Problem…I just bench tested, set up, and calibrated a 50:1 Chinese 4th axis rotary. Worked perfectly and was repeatable and accurate. I am using a JST 4 pin connector/pigtails as I have seen/heard others … --- ## [Altmill Z Screw](https://forum.sienci.com/t/altmill-z-screw/26409)
**Author:** [@Keithleatherwood](https://forum.sienci.com/u/Keithleatherwood)\ **Replies:** 7\ **Last updated:** [May 16, 2026, 2:11am UTC](https://forum.sienci.com/t/altmill-z-screw/26409 "2026-05-16T02:11:54Z")
Well, my project material came loose during a vortex rotary carve. The material bent the Z axis screw on my Altmill 4x4 with spindle. Tried to order through Sienci but the photos won’t upload to the ticket. I sent in a … --- ## [Initial setup issues with speed and limits](https://forum.sienci.com/t/initial-setup-issues-with-speed-and-limits/26403)
**Author:** [@4thbboy](https://forum.sienci.com/u/4thbboy)\ **Replies:** 0\ **Last updated:** [May 13, 2026, 11:48pm UTC](https://forum.sienci.com/t/initial-setup-issues-with-speed-and-limits/26403 "2026-05-13T23:48:18Z")
I just got the Altmill Mk2. Been having a lot of issues with it. First thing I did, once I got everything powered on, was work on the spindle. I went with a PWN 80mm water cooled. Oh boy was that fun, but I expected that… --- ## [Bad vibrations Right side Y-Axis.](https://forum.sienci.com/t/bad-vibrations-right-side-y-axis/26379)
**Author:** [@kconley](https://forum.sienci.com/u/kconley)\ **Replies:** 6\ **Last updated:** [May 12, 2026, 1:11am UTC](https://forum.sienci.com/t/bad-vibrations-right-side-y-axis/26379 "2026-05-12T01:11:03Z")
Hello all! I just received my Altmill 4x4 this last week and got it set up and running over the weekend. I’ve had a few issues with the homing functions, etc. that I’ve worked my way through. Everything seemed to be wor… --- ## [My Altmill is missing areas, off in its movements, and cutting spots in shouldnt](https://forum.sienci.com/t/my-altmill-is-missing-areas-off-in-its-movements-and-cutting-spots-in-shouldnt/26374)
**Author:** [@TJL227](https://forum.sienci.com/u/TJL227)\ **Replies:** 2\ **Last updated:** [May 9, 2026, 8:44pm UTC](https://forum.sienci.com/t/my-altmill-is-missing-areas-off-in-its-movements-and-cutting-spots-in-shouldnt/26374 "2026-05-09T20:44:33Z")
Hi, i have a Altmill 4x4 that seems to be having some problems with its movments. im working on a inlay and it has lots of details. but im noticing it keeps missing some areas to cut then other times over cuts in some ar… --- ## [Altmill Mk2 2x4 - Z-axis motor coupling and motor alarms 6 and 17](https://forum.sienci.com/t/altmill-mk2-2x4-z-axis-motor-coupling-and-motor-alarms-6-and-17/26322)
**Author:** [@skivvie](https://forum.sienci.com/u/skivvie)\ **Replies:** 3\ **Last updated:** [May 9, 2026, 4:59pm UTC](https://forum.sienci.com/t/altmill-mk2-2x4-z-axis-motor-coupling-and-motor-alarms-6-and-17/26322 "2026-05-09T16:59:49Z")
I’ve starting getting alarm 6 (Homing Fail) and 17 (Motor Fault) during the homing cycle z-axis travel. Red blinking light on z motor confirms. Reset usually fixes it… only seems to happen on first power up of the day. I… --- ## [Altmill Y stepper motor noise](https://forum.sienci.com/t/altmill-y-stepper-motor-noise/26349)
**Author:** [@Briannackers](https://forum.sienci.com/u/Briannackers)\ **Replies:** 5\ **Last updated:** [May 7, 2026, 5:49pm UTC](https://forum.sienci.com/t/altmill-y-stepper-motor-noise/26349 "2026-05-07T17:49:04Z")
Hi, I’m new to the forum. I’ve had my Altmill for over a year. I noticed a buzzing noise from the Y2 stepper motor when it’s stopped. When I first noticed it, both Y motors were very hot. If I turn off the power, the n… --- ## [Using g-Sender 1.5.7 0n Window 11 Get disconnected Sometimes](https://forum.sienci.com/t/using-g-sender-1-5-7-0n-window-11-get-disconnected-sometimes/26355)
**Author:** [@TonyAme](https://forum.sienci.com/u/TonyAme)\ **Replies:** 3\ **Last updated:** [May 7, 2026, 5:32pm UTC](https://forum.sienci.com/t/using-g-sender-1-5-7-0n-window-11-get-disconnected-sometimes/26355 "2026-05-07T17:32:25Z")
Using g-Sender with a Windows 11 laptop. Been getting disconnected (g-Sender disconnects from the controller), need to turn off the controller then turn it back on in order to re-connect. Would this most likely be an iss… --- ## [AutoZero Touchplate Inconsistant Zero](https://forum.sienci.com/t/autozero-touchplate-inconsistant-zero/26117)
**Author:** [@Davey](https://forum.sienci.com/u/Davey)\ **Replies:** 4\ **Last updated:** [May 6, 2026, 12:14pm UTC](https://forum.sienci.com/t/autozero-touchplate-inconsistant-zero/26117 "2026-05-06T12:14:08Z")
I’m trying to do a Vcarve generating the toolpath with Vectric Vcarve and running it on my Altmill with gsender. I’m seeing a step between my clearance tool and V bit of about 0.015” when Z zeroing with AutoZero touchpl… --- ## [Y1 Motor fault tripping, but can't find fault](https://forum.sienci.com/t/y1-motor-fault-tripping-but-cant-find-fault/26346)
**Author:** [@Melvin](https://forum.sienci.com/u/Melvin)\ **Replies:** 2\ **Last updated:** [May 5, 2026, 10:07pm UTC](https://forum.sienci.com/t/y1-motor-fault-tripping-but-cant-find-fault/26346 "2026-05-05T22:07:51Z")
I have a 4x4 Altmill I’m having an issue with the Y1 motor. It immediately trips an error when I try to jog with it or print. I tried swapping the Y2 and Y1 cables to see if the issue moved, and it did, after switchi… --- ## [Air leaking from ATC spindle when spinning?](https://forum.sienci.com/t/air-leaking-from-atc-spindle-when-spinning/26344)
**Author:** [@Yohahn](https://forum.sienci.com/u/Yohahn)\ **Replies:** 0\ **Last updated:** [May 5, 2026, 2:35pm UTC](https://forum.sienci.com/t/air-leaking-from-atc-spindle-when-spinning/26344 "2026-05-05T14:35:31Z")
The only time air leaks is when spindle is spinning. Not sure if that is normal or not. Seems odd. Causes my compressor to cycle allot. No air leaks when sitting idle. After communicating with Sienci I was informed … --- ## [Beginner -Slight overshoot on corners (Y Axis)](https://forum.sienci.com/t/beginner-slight-overshoot-on-corners-y-axis/26068)
**Author:** [@AshleyWilliams](https://forum.sienci.com/u/AshleyWilliams)\ **Replies:** 6\ **Last updated:** [April 30, 2026, 7:00am UTC](https://forum.sienci.com/t/beginner-slight-overshoot-on-corners-y-axis/26068 "2026-04-30T07:00:43Z")
Hello All! I’m new to CNC routing, but I’ve been 3D printing for 15+ years. I just purchased an Altmill 4x4. I’ve done a few projects with it so far (relief carvings and some acrylic inlays) without issue. My wife w… --- ## [Second guessing assembly](https://forum.sienci.com/t/second-guessing-assembly/26291)
**Author:** [@Crazy8sCommando](https://forum.sienci.com/u/Crazy8sCommando)\ **Replies:** 1\ **Last updated:** [April 29, 2026, 4:20pm UTC](https://forum.sienci.com/t/second-guessing-assembly/26291 "2026-04-29T16:20:09Z")
I’m waiting on a replacement X motor (due to be delivered tomorrow afternoon) so I’ve had time to overthink everything I’ve done up to this point. In the assembly instructions, when assembling the gantry you use a clamp… --- ## [Altmill Circle Misstep Issues](https://forum.sienci.com/t/altmill-circle-misstep-issues/26172)
**Author:** [@JaredC48](https://forum.sienci.com/u/JaredC48)\ **Replies:** 19\ **Last updated:** [April 25, 2026, 8:56am UTC](https://forum.sienci.com/t/altmill-circle-misstep-issues/26172 "2026-04-25T08:56:54Z")
New to CNC, noticing small imperfections when making circles in multiple materials. My immediate thought is that its a tramming issue, however surfacing my waste board doesn’t show anything off. Any ideas are greatly app… --- ## [Newbie needs help with SLB and stepperonline motors](https://forum.sienci.com/t/newbie-needs-help-with-slb-and-stepperonline-motors/26199)
**Author:** [@PBA](https://forum.sienci.com/u/PBA)\ **Replies:** 6\ **Last updated:** [April 22, 2026, 1:51pm UTC](https://forum.sienci.com/t/newbie-needs-help-with-slb-and-stepperonline-motors/26199 "2026-04-22T13:51:32Z")
Hey folks! I apologize if this is in the wrong place. CNC machining newbie here. I have just purchased an SLB for a newly acquired (3yr old never built) GR3 24x48 setup. It has 3 Stepperonline Nema23 2.8a, 1.85nm motors.… --- ## [Z sensor busted on first homing](https://forum.sienci.com/t/z-sensor-busted-on-first-homing/26212)
**Author:** [@GPeak](https://forum.sienci.com/u/GPeak)\ **Replies:** 4\ **Last updated:** [April 19, 2026, 5:23pm UTC](https://forum.sienci.com/t/z-sensor-busted-on-first-homing/26212 "2026-04-19T17:23:20Z")
Hi all. I busted my Z sensor on first movements when homing for the first time. I obviously had it to far in. And my router smashed up to the top. Going to see if I can get a replacement sensor. But, is there a better ga… --- ## [Longmill just doesn’t work](https://forum.sienci.com/t/longmill-just-doesn-t-work/26169)
**Author:** [@GeneO](https://forum.sienci.com/u/GeneO)\ **Replies:** 4\ **Last updated:** [April 14, 2026, 6:08pm UTC](https://forum.sienci.com/t/longmill-just-doesn-t-work/26169 "2026-04-14T18:08:15Z")
I’ve had my 30x48 Longmill from Sienci for many months and as yet have not produced a single product. I’ve been in touch with Sienci many times. Basically the machine loses “z” over and over thus ruining projects. Also,… --- ## [Failure of SLB-EXT](https://forum.sienci.com/t/failure-of-slb-ext/26159)
**Author:** [@Jens](https://forum.sienci.com/u/Jens)\ **Replies:** 27\ **Last updated:** [April 14, 2026, 3:18pm UTC](https://forum.sienci.com/t/failure-of-slb-ext/26159 "2026-04-14T15:18:51Z")
I am sad to report that I will be ordering a new controller for my Altmill. The mill first arrived in October 2024 and the controller was replaced under warranty once. It is unfortunately well out of warranty now. I am l… [Previous page](https://forum.sienci.com/c/support/issue/42.md?page=1) [Next page](https://forum.sienci.com/c/support/issue/42.md?page=3)