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 Rank: Newbie Groups: Registered
Joined: 14/03/2017 Posts: 2 Points: 6
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I just finished building my Robi, but he keeps falling forward when he tries to get up or do the balance game. Strangely - when he walks forward - though kind of wobbly - he doesn't fall forward.
I already followed the instruction to add the servo paddings to his front-sole servo motor areas in both his left and right feet (2 pads each), but he still falls forward.
Any tips on how to remedy this?
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Welcome to the forum, hope you enjoy your time with us....  .. Will see if I can get someone to help with your problem.... Regards Alan
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 Hi Prexus Firstly a big welcome to the forum now onto your problem. This will need some dissassembly. Firstly check that all screws on Robi's legs are correctly tightened and that all cables are running freely from servo to servo. Lastly check that all servo to component joints are correctly lined up on the legs, just one notch out can cause problems. Also check the arms are correctly assembled as with the legs to body servo joint. Get back to me if your still having problems after doing all the above. Andy Current builds:-C57,Zero, Lamborghini Countach, Caldercraft HMS Agamemnon,Robi,R2-D2, MFH Cobra .
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Rank: Newbie Groups: Registered
Joined: 14/03/2017 Posts: 2 Points: 6
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arpurchase wrote: Hi Prexus Firstly a big welcome to the forum now onto your problem. This will need some dissassembly. Firstly check that all screws on Robi's legs are correctly tightened and that all cables are running freely from servo to servo. Lastly check that all servo to component joints are correctly lined up on the legs, just one notch out can cause problems. Also check the arms are correctly assembled as with the legs to body servo joint. Get back to me if your still having problems after doing all the above. Andy Well I did add the paddings to the front part of his feet servos. Isn't that suppose to elevate his center of gravity a bit to help with that? Also speaking of servos, I do notice that when Robi is in the sitting position - his right foot taps a bit up-and-down (left feet is still). Also when he is in the standing-position - his feet are still, but both of his arms shake a little back-and-forth.. Is this normal?
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Hi Prexus The movements are normal and are like breathing movements to indicate he is on and awaiting instructions. As for your failing over problem If the checks I have asked for are not done how can we be sure the assembly has been done correctly [I am not saying it hasnt] so we can move forward to correct the problem. Andy Current builds:-C57,Zero, Lamborghini Countach, Caldercraft HMS Agamemnon,Robi,R2-D2, MFH Cobra .
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Rank: Newbie Groups: New Members, Unapproved Joined: 12/03/2020 Posts: 1 Points: 3 Location: Liverpool, UK
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arpurchase wrote: Hi Prexus The movements are normal and are like breathing movements to indicate he is on and awaiting instructions. As for your failing over problem If the checks I have asked for are not done how can we be sure the assembly has been done correctly [I am not saying it hasnt] so we can move forward to correct the problem. Andy Hi Andy I know this is an old post but are you still able to advise on this problem? I have done all the checks you asked the other guy to do and I have even tried shifting the centre of gravity with pads in shoes! I’m losing my mind as I’ve had it apart so many times I feel like I’m chasing my tail! I only recently got chance to make my robi after having it all stored away for a few years unopened :/ Any help welcomed Paul
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Rank: Advanced Member
Groups: Registered
Joined: 17/04/2021
Posts: 34
Points: 105
Location: UK
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Bluthson wrote:
Hi Andy I know this is an old post but are you still able to advise on this problem? I have done all the checks you asked the other guy to do and I have even tried shifting the centre of gravity with pads in shoes! I’m losing my mind as I’ve had it apart so many times I feel like I’m chasing my tail!
I only recently got chance to make my robi after having it all stored away for a few years unopened :/
Any help welcomed
Paul
I have a similar issue with a little guy I am resurrecting as well.. I have 2 Robi who are fine, and have fixed several that have only had complete non-working joints - however this little guy I think is doing the same as yours... He falls forwards and is kinda wobbly on his feet. In fact he fell so hard he headbutted the floor and snapped that stupidly small ring that hold the neck into the scarf! So ordering that from Japan.... Loving Robi but they are so fragile!
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 Rank: Super-Elite      Groups: Registered
Joined: 17/12/2013 Posts: 3,982 Points: 11,974 Location: NY, USA
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I had this with my Robi and a little extra padding under both shoes stabilized him.I assume you have checked for any assembly issues and are using a well charged battery.
Carl
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Rank: Advanced Member
Groups: Registered
Joined: 17/04/2021
Posts: 34
Points: 105
Location: UK
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darbyvet wrote:I had this with my Robi and a little extra padding under both shoes stabilized him.I assume you have checked for any assembly issues and are using a well charged battery.
Carl
I'll check the battery (it seems OK in my other Robis and lasts around half hour when he's sat down chatting). Is there a how to on the padding? Also I noticed his right knee servo (No.4) seems to be a bit weak as it is a bit floppy when he tries to stand up... I'll open his leg up and check wiring etc as this was not my build.
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Rank: Super-Elite Groups: Registered
Joined: 17/12/2013 Posts: 3,982 Points: 11,974 Location: NY, USA
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AdamE wrote:darbyvet wrote:I had this with my Robi and a little extra padding under both shoes stabilized him.I assume you have checked for any assembly issues and are using a well charged battery.
Carl
I'll check the battery (it seems OK in my other Robis and lasts around half hour when he's sat down chatting). Is there a how to on the padding? Also I noticed his right knee servo (No.4) seems to be a bit weak as it is a bit floppy when he tries to stand up... I'll open his leg up and check wiring etc as this was not my build. I would check the servo wiring first before messing with the feet.The weak servo may be throwing off the gyro on the main board. As far as the foot goes I just added some very thin styrene sheet to the front of both feet on the underside of the toes and then stuck the felt pad back down again. Carl
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