# Each restart needs recalibration
**URL:** https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463
**Category:** Troubleshooting
**Created:** [January 31, 2026, 2:58am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463 "2026-01-31T02:58:00Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@oddbyte](https://forums.maslowcnc.com/u/oddbyte)
#### Post date: [January 31, 2026, 2:58am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/1 "2026-01-31T02:58:00Z")
Is anyone else having the problem of having to re-calibrate any time the maslow is restarted? I have gotten to the point that I have ordered a new motherboard just in case it is just my machine.
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### Author:  [@ian\_ab](https://forums.maslowcnc.com/u/ian_ab)
#### Post date: [January 31, 2026, 3:08am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/2 "2026-01-31T03:08:52Z")
That is definitely not normal. Can you put up a copy of your Serial log after a restart. Also click on Test under setup which will indicate versions your Maslow is running.
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### Author:  [@oddbyte](https://forums.maslowcnc.com/u/oddbyte)
#### Post date: [January 31, 2026, 3:11am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/3 "2026-01-31T03:11:26Z")
[Maslow-serial.log](https://forums.maslowcnc.com/uploads/short-url/4Ep8SX4LXmavm7F9VIWyjf1pvKq.log) (30.2 KB)
I am currently running a calibration but this is the log so far and this error is occurring: [MSG:ERR: Calibration data not acknowledged by computer, resending]
It now seems to be stuck in a loop….
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### Author:  [@ian\_ab](https://forums.maslowcnc.com/u/ian_ab)
#### Post date: [January 31, 2026, 3:17am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/4 "2026-01-31T03:17:56Z")
Do you have multiple browser windows open. Find Anchor Locations does not like that.
Which version of firmware and index,html.gz are you running? It looks like V1,17 (latest)
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### Author:  [@ian\_ab](https://forums.maslowcnc.com/u/ian_ab)
#### Post date: [January 31, 2026, 3:31am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/5 "2026-01-31T03:31:24Z")
You are getting an error
[MSG:ERR: Calibration data not acknowledged by computer, resending]
CLBM:[{bl:1802.27, br:1755.36, tr:1920.99, tl:1920.03},{bl:1921.25, br:1643.96, tr:1818.02, tl:2029.32},{bl:2009.29, br:1736.25, tr:1713.84, tl:1947.37},{bl:1899.26, br:1847.39, tr:1818.27, tl:1828.85},{bl:1785.04, br:1966.32, tr:1936.73, tl:1713.24},{bl:1683.77, br:1884.32, tr:2030.27, tl:1806.81},]
Computing… This may take several minutesInitial guess fitness: 0.1288731
Indicating Maslow is not receiving an indication data is being received by the browser (it is).
You can try Refreshing the browser or closing all browser windows connected to Maslow as I don’t think it will drop out of that loop by itself. It will mean you have to Retract, Extend again.
Have you got alternate browser you can try. You could also try connecting via browser on your mobile phone.
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### Author:  [@oddbyte](https://forums.maslowcnc.com/u/oddbyte)
#### Post date: [February 2, 2026, 12:25am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/6 "2026-02-02T00:25:10Z")
It can’t be the browser as I have run the process from this browser many many times as I have to re-calibrate each time I restart the maslow or run into any issue such as a software crash(on the maslow)… I will give it all another go tomorrow. Just in case, which browser is the supported or recommended one to use?
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### Author:  [@dlang](https://forums.maslowcnc.com/u/dlang)
#### Post date: [February 2, 2026, 12:39am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/7 "2026-02-02T00:39:07Z")
Scott wrote:
> It can’t be the browser as I have run the process from this browser many many
> times as I have to re-calibrate each time I restart the maslow or run into any
> issue such as a software crash(on the maslow)… I will give it all another go
> tomorrow. Just in case, which browser is the supported or recommended one to
> use?
what is it that is telling you that you need to recalibrate every time you
restart the maslow?
you need to retract/extend/apply tension, but not run find anchors if the
anchors haven’t moved
David Lang
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### Author:  [@oddbyte](https://forums.maslowcnc.com/u/oddbyte)
#### Post date: [February 2, 2026, 1:42am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/8 "2026-02-02T01:42:12Z")
Hi David, whenever I restart the Maslow retract/extend/apply tension the Maslow always says not ready to move/unknown state
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### Author:  [@ian\_ab](https://forums.maslowcnc.com/u/ian_ab)
#### Post date: [February 2, 2026, 3:29am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/9 "2026-02-02T03:29:32Z")
I think where your error may be coming from is the Maslow server does not connect to the internet, and your browser expects to find an internet connection, when it doesn’t it considers the Maslow to be a risky site and restricts access, which is why I suggested you try a different browser or via a phone. If you can connect to your local network that may also work.
Go to FluidNC, then Flash Settings and enter your local network to Sta/SSID and Password
I use Microsoft Edge
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### Author:  [@bar](https://forums.maslowcnc.com/u/bar)
#### Post date: [February 2, 2026, 5:23pm UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/10 "2026-02-02T17:23:59Z")
> [@oddbyte](#):
>
> not ready to move/unknown state
What is the exact message that you are getting? An unknown state doesn’t always mean that you have to do the whole process of finding the anchor points again, you should be able to just press “Apply Tension”
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### Author:  [@ian\_ab](https://forums.maslowcnc.com/u/ian_ab)
#### Post date: [February 2, 2026, 7:21pm UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/11 "2026-02-02T19:21:01Z")
@bar, oddbyte’s machine is going into a loop and repeating the following until interrupted:
CLBM:[{bl:1802.27, br:1755.36, tr:1920.99, tl:1920.03},{bl:1921.25, br:1643.96, tr:1818.02, tl:2029.32},{bl:2009.29, br:1736.25, tr:1713.84, tl:1947.37},{bl:1899.26, br:1847.39, tr:1818.27, tl:1828.85},{bl:1785.04, br:1966.32, tr:1936.73, tl:1713.24},{bl:1683.77, br:1884.32, tr:2030.27, tl:1806.81},]
Computing… This may take several minutesInitial guess fitness: 0.1288731
Frame dimensions: 2847.4mm x 2326.6mm (aspect ratio: 1.22:1)
Initial fitness \>= 0.1 and frame is not square, skipping rectangular optimization and using initial guess directly.
Fitness: 0.8802943 in 100
Fitness: 0.8802943 in 200
Fitness: 0.8802943 in 300
Fitness: 0.8802943 in 400
Fitness: 0.8802943 in 500
Fitness: 0.8802943 in 600
Fitness: 0.8802943 in 700
Fitness: 0.8802943 in 800
Fitness: 0.8802943 in 900
Fitness: 0.8802943 in 1000
Calibration values:
Fitness: 0.8802943
Maslow\_tlX: 33.7
Maslow\_tlY: 2324.5
Maslow\_trX: 2885.7
Maslow\_trY: 2342.5
Maslow\_blX: 0.0
Maslow\_blY: 0.0
Maslow\_brX: 2879.7
Maslow\_brY: 0.0
A command to save these values has been successfully sent for you. Please check for any error messages.
[MSG:ERR: Calibration data not acknowledged by computer, resending]
**It then repeats**
It’s only processing the initial data, never moving on to the next stage.
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### Author:  [@bar](https://forums.maslowcnc.com/u/bar)
#### Post date: [February 2, 2026, 7:31pm UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/12 "2026-02-02T19:31:18Z")
Hmmm yeah that is super weird!
The only time that I’ve seen that before is when machine was opened in two different tabs at the same time, is there a chance that is happening here?
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### Author:  [@ian\_ab](https://forums.maslowcnc.com/u/ian_ab)
#### Post date: [February 2, 2026, 7:38pm UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/13 "2026-02-02T19:38:17Z")
> [@bar](#):
>
> opened in two different tabs
I have asked @oddbyte to confirm it was only one.
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### Author:  [@oddbyte](https://forums.maslowcnc.com/u/oddbyte)
#### Post date: [February 2, 2026, 10:04pm UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/14 "2026-02-02T22:04:10Z")
Hi, I think the two browser problem could have been the case, I’m going to be working with it today so I’ll update progress but this isn’t the real issue anyway its the first time it has gotten stuck at the calibration stage. The real issue is having to recalibrate each time before it will do anything. I’ll post the log again today and also the exact message I am getting when it is not ready to move.
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### Author:  [@ian\_ab](https://forums.maslowcnc.com/u/ian_ab)
#### Post date: [February 2, 2026, 10:16pm UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/15 "2026-02-02T22:16:09Z")
I think it might be the same problem. I suspect your Maslow has not updated the maslow.yaml file with the calculated values, which means it doesn’t know where the anchor points are, so it’s starting from scratch each time. Can you put a copy of the maslow.yaml file here so I can see if that makes sense?
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### Author:  [@oddbyte](https://forums.maslowcnc.com/u/oddbyte)
#### Post date: [February 2, 2026, 11:47pm UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/16 "2026-02-02T23:47:24Z")
Here is the yaml file before I did a re-calibrate. I am currently running the calibrate then I will post the serial log and yaml file
[maslow.yaml](https://forums.maslowcnc.com/uploads/short-url/4wAY3v5gaSaEIQFxIru9fA4Tv5C.yaml) (6.9 KB)
Just in case it matters I am running Debian 13 with firefox 140.6.0esr
Also I have checked and definitely only one browser tab/window
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### Author:  [@oddbyte](https://forums.maslowcnc.com/u/oddbyte)
#### Post date: [February 3, 2026, 12:12am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/17 "2026-02-03T00:12:43Z")
Ok here is the serial log and maslow.yaml after a successful calibration
[maslow(2).yaml](https://forums.maslowcnc.com/uploads/short-url/w26fcXBkRQmJicI1iVeYk2XQoHi.yaml) (6.9 KB)
[Maslow-serial(1).log](https://forums.maslowcnc.com/uploads/short-url/qHs0UhJOZZmvZicFXI5E9hxpI5y.log) (128.0 KB)
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### Author:  [@oddbyte](https://forums.maslowcnc.com/u/oddbyte)
#### Post date: [February 3, 2026, 12:15am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/18 "2026-02-03T00:15:10Z")
Ok so after the calibration I did release tension, turned it off then on, the apply tension button is greyed out and if I click it anyway I get
Apply Tension
[MSG:INFO: Requesting state change from Unknown to Taking Slack]
[MSG:INFO: Cannot take slack until the belts have been extended]
Also I have attached the latest serial log from this restart.
[Maslow-serial(4).log](https://forums.maslowcnc.com/uploads/short-url/ft8WOa3oe1iqTa117HJZgUhA5ah.log) (2.4 KB)
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### Author:  [@bar](https://forums.maslowcnc.com/u/bar)
#### Post date: [February 3, 2026, 12:41am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/19 "2026-02-03T00:41:59Z")
It is strange that you are starting out in an unknown state, but it shouldn’t require re-running calibration.
Can you try **Retract All** (let them fully pull into the machine) → **Extend All** (extend them out and connect to the frame) → **Apply Tension**
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### Author:  [@oddbyte](https://forums.maslowcnc.com/u/oddbyte)
#### Post date: [February 3, 2026, 1:03am UTC](https://forums.maslowcnc.com/t/each-restart-needs-recalibration/25463/20 "2026-02-03T01:03:06Z")
I have done this many many times… it does not help. I can do it one more time if you want
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