2dof Questions and Problems

Hello, reading the forum I am trying to assemble my station. Everything works for now. The problem I can't solve is this: when the system is turned off, the lever arms point to the floor.So when I turn on the PC the arms do not return to horizontal position.this makes it impossible for me to sit because the seat remains tilted forward!! now I ask, how can I do to lock the arms in the starting position? For now I block the position at the front with two large wooden blocks.
I attach some explanatory photos. Thank you.

From memory, you correct this in the SMC3 profile. Basically, you must be exceeding the sinusoidal signal in SMC 3 in some way.

You need to review the settings so that when you turn on your chair, SMC3 can find the position of your motor.

To do this, check when you start it in the SMC software. If, when you turn on your motor, it exceeds the upper or lower limit, you have an incorrect gear/motor potentiometer ratio. This should create a continuous sinusoidal wave that alternates between high and low.

I'm not sure I explained this correctly...

Thank you for your comments. I apologize if I worried about one obvious thing but, not being a native English speaker, I definitely missed this thing. I'm glad it's normal, so I found a more elegant locking system than wedges!! finally, I decreased a little bit max limit So as to resume the engines without getting up to move the station. Thank you very much, if other problems arise

Good morning guys, I have another doubt. As you know I built a 2dof + TL using 3 wheelchair motors. Specifications are 24v, 250 W, 120 rpm, 13,4 amp. I used 3 ibt-2 and 3 arduino. The power supplies are 3 set to 18v.The power supplies are 3 set to 18v. Everything works regularly but I have seen that the 3 engine (right) and its ibt heat up even if the simulator is not used. I have read the forum and I can rule out engine and ibt problems because I have already tried to interchange them, to no avail. could it be an arm centering problem with respect to motor 2 (left)? I measured the angle of 90 of the levers by eye. Or maybe, since I used 2 arms of my car that have the ball joint, the position of the resting station is never centered right / left and the engine struggles! Dunno. i attach setting Smc3. Thank you

Thanks noorbeast for the clarification. In my time I followed all the instructions found on the forum and balanced to the cm following the link. today I leveled the corner and added a heatsink to the ibt. It won't do anything but it won't hurt! I'll see what happens and say

Yesterday I played for 2 hours and the engine was only slightly lukewarm. I also let it rest half a day to see if it warmed up but no longer warms up thankfully. Only the annoyance remains that, every now and then, an engine scales and goes off scale, and then deactivates. I have very limited the angles of use so as not to have a too aggressive movement response and I have decreased in smc3 the PWMmax to prevent the levers from exceeding the Max Limit.Can I do something about this?

Thanks for the answer. I tried and tried again and found that I had enlarged the installation position of the motors too much. this is probably the problem of imbalance.I placed the engines closer together so as to bridge the difference between the bases and, by trying the lateral movement (roll) by hand, it would seem that I lost every game. Tomorrow i'll try movements with smc3.