
kgreaves81
United Kingdom
Asked
— Edited

Hi just got my JD today and following build and cal tried a few sit up and stand moves, after several goes smoke from shoulder. Result is servo overheated and locked. Reading back I have seen comment on tight movement and did notice that both shoulders are a lot tighter that other joints. Have now asked shop in uk to send new servo but would like advise on shoulder joints to get my JD dancing again.
Thx KG
just to update have removed body and checked free rotation of left servo by hand, it is significantly tighter when in the body with the retaining screw fully tightened. when removed from the body the servo moves freely. so will need to adjust fit for both servos to prevent further servo burn out of replacement right and left thanks
KG
Just done a few checks on the fit of shoulder servo mounts.
Internal diameter of hole in body 13.12 /13.06mm
Diameter of servo mount is tapered an increases in size 13.06/ 13.43mm max with interference fit to body bore.
This results in the servo mount locking when tighten down by servo screw. To solve the issue you need to tighten the tolerance on the servo mount o/d. The scraping of the bore is only a repair but is not the root cause of your quality problem.
Hope this helps solve this going forward. In the mean time I need to get my JD up and running
Thx KG
There are thousands of JD's out there
So far there is no way of getting spare parts in the UK that I know of
Thx KG
There are only a handful of JD's with the shoulder issue - we caught it quick. You're getting a free replacement shoulder servo, wouldn't say that's unlucky
now i dont have to wait.i fixed mine whit a new metal drill from 14 mm
looks and sounds drastic,but you see nothing from using the drill.
i drill them by hand whit glove on.also i did bolt just incase.
not many or all first molded has this issue,i seen only about 3 inclu myself.
i bin here almost a year i think.