# Calibration : Adjusting the left chain left to attach the sled (second part of the calibration, attaching the sled)

**URL:** <https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602>\
**Category:** Troubleshooting\
**Created:** [April 26, 2018, 4:17pm UTC](https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602 "2018-04-26T16:17:02Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![Lois\_Forcioli-Conti](https://avatars.discourse-cdn.com/v4/letter/l/54ee81/32.png) [@Lois\_Forcioli-Conti](https://forums.maslowcnc.com/u/Lois_Forcioli-Conti)\
**Post date:** [April 26, 2018, 4:17pm UTC](https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602/1 "2018-04-26T16:17:02Z")

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Hi,  
I’ve been encountering a a trouble when the machine tries to set the chain length in order to attached the sled.  
When I try to extend the chain for the left motor, the result is an alarm message and I can’t go further for the left motor.  
To adjust the right motor there were no issues. I have the latest firmware for the arduino and groundcontrol 1.12  
Can you help me please?

 ![05](https://canada1.discourse-cdn.com/flex031/uploads/maslowcnc/original/2X/9/9040cb89df66b20d05b76b124b498031cd305e3f.jpg)

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<div class="post-metadata">

**Author:** ![bar](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/bar/32/10_2.png) [@bar](https://forums.maslowcnc.com/u/bar)\
**Post date:** [April 26, 2018, 4:32pm UTC](https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602/2 "2018-04-26T16:32:07Z")

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This is a new feature in 1.12 that we will probably need to fine tune. Sorry for the trouble!

You can disable that popup by changing the value of the position error limit under **Advanced Settings** to be something large (like 200)

 ![image](https://canada1.discourse-cdn.com/flex031/uploads/maslowcnc/original/2X/3/36c67f0e2fb45aab4047c72ae76f90b97ab6b79f.png)

Before you do that, would you be willing to attach your log file so that we can see what is going on? It will help us fix the issue so that no one else runs into it.

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<div class="post-metadata">

**Author:** ![Lois\_Forcioli-Conti](https://avatars.discourse-cdn.com/v4/letter/l/54ee81/32.png) [@Lois\_Forcioli-Conti](https://forums.maslowcnc.com/u/Lois_Forcioli-Conti)\
**Post date:** [April 26, 2018, 4:51pm UTC](https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602/3 "2018-04-26T16:51:36Z")

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Thank you for the help bar, I’ll be right on it, I’ll gladly provide my log file, where can I find it?

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<div class="post-metadata">

**Author:** ![bar](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/bar/32/10_2.png) [@bar](https://forums.maslowcnc.com/u/bar)\
**Post date:** [April 26, 2018, 4:54pm UTC](https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602/4 "2018-04-26T16:54:21Z")

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Embarrassingly I’m not sure on Mac. It should be in the same folder in which Ground Control is installed.

Can anyone else point us to the right place for the log file on OS X?

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<div class="post-metadata">

**Author:** ![Lois\_Forcioli-Conti](https://avatars.discourse-cdn.com/v4/letter/l/54ee81/32.png) [@Lois\_Forcioli-Conti](https://forums.maslowcnc.com/u/Lois_Forcioli-Conti)\
**Post date:** [April 26, 2018, 6:21pm UTC](https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602/5 "2018-04-26T18:21:05Z")

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I’ll figure it out and I’ll send it back to you.

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<div class="post-metadata">

**Author:** ![blurfl](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/blurfl/32/9_2.png) [@blurfl](https://forums.maslowcnc.com/u/blurfl)\
**Post date:** [April 27, 2018, 1:50am UTC](https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602/6 "2018-04-27T01:50:32Z")

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> [@Lois\_Forcioli-Conti](#):
>
> I’ll gladly provide my log file, where can I find it?

In OSX the log file is in /Applications/GroundControl.app/Contents/Resources/yourapp/log.txt  
In the Terminal, this line will copy it into your home directory:

> cp /Applications/groundcontrol.app/Contents/Resources/yourapp/log.txt ~/log.txt

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<div class="post-metadata">

**Author:** ![Lois\_Forcioli-Conti](https://avatars.discourse-cdn.com/v4/letter/l/54ee81/32.png) [@Lois\_Forcioli-Conti](https://forums.maslowcnc.com/u/Lois_Forcioli-Conti)\
**Post date:** [April 27, 2018, 1:47pm UTC](https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602/7 "2018-04-27T13:47:35Z")

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Here is my log file thank you blurfl  
[log.txt.zip](https://canada1.discourse-cdn.com/flex031/uploads/maslowcnc/original/2X/d/d44624be88e0b9aed9612633d616ae18d2c61954.zip) (96.0 KB)

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<div class="post-metadata">

**Author:** ![bar](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/bar/32/10_2.png) [@bar](https://forums.maslowcnc.com/u/bar)\
**Post date:** [April 27, 2018, 4:36pm UTC](https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602/8 "2018-04-27T16:36:46Z")

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Thanks!

Here are all of the times that error pops up in the log:

Around line 46054:

```
Sent: B02 L1 R0  
B02 L1 R0
Measuring out left chain
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-1.08,0.00,127]
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-2.08,0.00,127]
ALARM: The sled is not keeping up with its expected position - make a note of the line number. Then click the 'Stop' button to clear the alarm.  
1.74mm
[Forward Calculating Position]

```

Around line 47243:

```
B02 L1 R0
Measuring out left chain
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-1.22,0.00,127]
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-1.84,0.00,127]
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-2.25,0.00,127]
ALARM: The sled is not keeping up with its expected position - make a note of the line number. Then click the 'Stop' button to clear the alarm.  
4.37mm
[Forward Calculating Position]

```

Around line 51090:

```
Sent: B02 L1 R0  
B02 L1 R0
Measuring out left chain
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-1.46,1.50,127]
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-2.01,1.50,127]
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-2.44,1.50,127]
ALARM: The sled is not keeping up with its expected position - make a note of the line number. Then click the 'Stop' button to clear the alarm.  
10.26mm
[Forward Calculating Position]

```

Around 51514:

```
B02 L1 R0
Measuring out left chain
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-0.24,0.00,127]
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-1.63,0.00,127]
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-2.05,0.00,127]
ALARM: The sled is not keeping up with its expected position - make a note of the line number. Then click the 'Stop' button to clear the alarm.  
15.61mm
[Forward Calculating Position]

```

Around 52309:

```
B02 L1 R0
Measuring out left chain
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-1.66,0.00,127]
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>
[PE:-2.12,0.00,127]
ALARM: The sled is not keeping up with its expected position - make a note of the line number. Then click the 'Stop' button to clear the alarm.  
19.89mm
[Forward Calculating Position]
<Idle,MPos:0.00,0.00,-0.00,WPos:0.000,0.000,0.000>

```

Around 112119:

```
<Idle,MPos:510.18,202.15,5.01,WPos:0.000,0.000,0.000>
[PE:-0.86,201.15,127]
ALARM: The sled is not keeping up with its expected position - make a note of the line number. Then click the 'Stop' button to clear the alarm.  
[Forward Calculating Position]
position loaded at:
415.56
6.99
<Idle,MPos:415.56,6.99,5.01,WPos:0.000,0.000,0.000>
[PE:0.23,0.00,127]

```

It looks to me like the alarm is working normally, and we may just want to slow down how fast the chains extend

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<div class="post-metadata">

**Author:** ![eightlines](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/eightlines/32/5862_2.png) [@eightlines](https://forums.maslowcnc.com/u/eightlines)\
**Post date:** [May 10, 2018, 6:53pm UTC](https://forums.maslowcnc.com/t/calibration-adjusting-the-left-chain-left-to-attach-the-sled-second-part-of-the-calibration-attaching-the-sled/3602/9 "2018-05-10T18:53:18Z")

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I’ve also run into this same issue using the most recent build 1.13 (May 10). I can send my log file, but I can’t upload it as I’m a new user. Attempting the Advanced settings & recalibration now.