Infernal robotics gantry sticking

[pete.hammett@gmail.com]

I am trying to work with the rail gantry from internal robotics and when the carriage gets about halfway down the rail it will stick then jerk back. This only happens in one direction, if I go in the other direction I can go all the way to the end. Any advice on what's happening would be appreciated. Here's a GIF of what's happening

 

 

[Vanamonde]

I'm sorry that I do not know how to fix that, but I have moved your question to the modding support sub where it is to be hoped that someone does. Good luck. 

[Lisias]

Looks like an autostrut trolling you.

Can you publish the craft file? It would make easier to check it!

[pete.hammett@gmail.com]

13 hours ago, Lisias said:

Looks like an autostrut trolling you.

Can you publish the craft file? It would make easier to check it!

That's kind of what I was thinking, but I didn't autostrut anything. This gantry was giving me trouble on a much more complicated craft, so this was just a simple test to try and figure out what was happening. The other thought I had is that it might be tweakscale causing some issues, but I have the same problem whether the gantry is normal size, or scaled up. Here's a link to the craft file https://kerbalx.com/daspete/gantryTest

[Lisias]

11 hours ago, pete.hammett@gmail.com said:

That's kind of what I was thinking, but I didn't autostrut anything. This gantry was giving me trouble on a much more complicated craft, so this was just a simple test to try and figure out what was happening. The other thought I had is that it might be tweakscale causing some issues, but I have the same problem whether the gantry is normal size, or scaled up. Here's a link to the craft file https://kerbalx.com/daspete/gantryTest

TweakScale mangles the mass and the attach points... Yeah, something stomping TS toes, an unhandled exception, and anzero mass part someone nullifying any force applied to it. The gantry stretches itself to a point, and by releasing the power, it comes back to the original attitude abruptly, exactly as it would be "welded" to a part by an autostrut.

However.... I'm sorry to say, but... "It works for me" ™  

I tested it on a near clean test bed, so all I had ruled out is a bug on vanilla IR. It's a interaction between IR and something else. I will inspect the craft file, install the missing Add'Ons based on the missing Modules, and try again. In the mean time, can you publish a "full" KSP.log from your instalment? Delete the MM caches and fire it up, load the craft, execute the action that leads to the problem, quit KSP, and then get the KSP.log?

It's plain possible that I could diagnose the problem inspecting the craft file, but if I don't, we would save some time by having your KSP.log by the time I come here to report my findings.

--- POST EDIT --

Shoving up the max value for Force, Acceleration and MaxSpeed makes the testing surprisingly entertaining.

-- POST POST EDIT --

@pete.hammett@gmail.com, I checked the "source" for your craft, and installed the Add'Ons that would satisfy that modules:

• MechJebCore (MechJeb2)
• USI_ModuleRecycleablePart (UmbraSpaceIndustries)
• RCSLandingAidModule (RCSLandingAid)
• FlightEngineerModule (FlightEnginerRedux)

NONE of them presented any glitch, everything worked as intended.

So I thought if could be KerbalJointReinforcement Continued, at least the last time I checked, it is not compatible with Infernal Robotics. However, my guess was wrong, things were working as expected even with KJR installed.

The only way I could kinda reproduce your issue was using AutoStrut to Root. AutoStruting to GrandeParent and to Heaviest just locked the gantry, but using To Root rendered it behaving more or less as your example.

So, if you are absolutely sure you are not using AutoStrut on that thing (and the craft file had the autostrut deactivated), I'm pretty sure is some Add'On doing something like the autostrut (perhaps an old version of KJR/N?  I know of one release that borked, but it was quickly fixed).

In order to keeping pursuing this bug, I will need that KSP.log I asked above.

Follows a video with the test run (video is terrible, Apple cripped QuickTime on Mojave! My older MacMini, still on Sierra, recorded videos better than this piece of <insert your favorite non forum compliant adjective here>.
 

 

Edited February 5, 2020 by Lisias
post edit

[jcart]

Unfortunately I am running into the exact same issue. I am able to reproduce it. Hoping someone has come along since then to determine what was the root cause.

Happy to provide saves or crafts.

Love the mod otherwise, thanks! 

 

[jcart]

Seems to only be occurring in the latest branches. I'll keep digging but I hope to fix these issues and bring it up to date with KOS.