Hi there. is anyone using 18 of those hitec HSR-5995tg servos. (expensive yes) but they look like they could meke the thing jump. (specs wise)
im not entirly sure, but i dont think anyone is using those dan
- they are very expensive
2)they would be way over kill, most people find that the HS-5645’s, HS-645’s, or the HS-5475 work fine, the HS-5995tg’s only beat the other servos in torque by a lot, the other servos i named are close in speed
3)why would u need that much torque? unless ur carrying quite a load
-Jared
P.S. Im not totally sure about this, this is what i’ve gathered from the forums, so please dont fry me to much if im wrong
I am going to be using them when I start adding more weight to my spider. But I am using the 645 right now. Plus I still have 4 legs to buy/build/add to my slow moving project.
Just so you know I will be having a Mini-itx computer as part of my load (another 8lb) just with that.
- 645 should be able to hold ~8lb on there own but I also added other things to weaken them (long legs).
I have mixed feelings about the 5995. It is the muscle bound hulk of the range. High torque has other costs as well as the initial $$
Powerful it surely is, but is capable of self destruction. I do love the way the servo flexes when you hit the endstops !
The motor current on stall is greater than the allowed continous dissapation of the H bridges, so stalled torque, can only be maintained for about 10 secs. There is not adequate heatsinking for continous load, and no internal current monitoring, limiting or protection.
Also, although it says position feedback on the box, even Hitec now say it does not work !
So maybe a good servo for that winning kick or leap, but if you are using for continous load, measure the current . H Bridges are rated at 2.8A, though at 7.4 Volts your motors are then cooking too. Some users have used heatsinks and heatsink compound on the cases.
The other servos mentioned above operate more within their limits.
I agree with everything you said, except about hitting the end stops. Well more accurately I don’t think it is difficult to prevent it. I just didn’t want people to get the impression that it’s easy to break it, that’s all.
On the heating up issue. I can only rationalize it with the thinking they were designing a RoboOne servo. So the servos would only be in use for a few minutes at a time during the competition. Yes, lots of people think that servo will operate at full load for as long as they want it to. That is just not true.
I sure didn’t mean easy to break. This some tough beast. It just that you feel this sort on muscular ripple at the endpoints. It may happen elsewhere, but I am not strong enough to hold it.
I don’t think the slight flexing is any weakness in the case, maybe just a consequence of the slight give in the rubber O rings which they use to seal the case on all joints.
I would recommend reprogramming the endpoints inside the stops.
I need to build a new servo torture rack to deal with this beast, then maybe I can make some proper measurements of the torque.