Off axis pressure on servo horn - OK?

Hi,
I aim to attach aluminum tubing directly to servo horn (via tubing connector hub) to make the tube rotate. I will then attach substantial weight at other end of the tube.
Can a servo take this kind of off axis pressure on the horn? I actually cannot find any pics of this type of setup.

Question #2: Does the HSR-5995TG fit in all standard brackets? I understand it has an additional pivot point on the back that adds to size. Since I noted there are custom brackets offered for this servo I thought I´d better check this.

Thanks Peter.

Hi,

I think you’d be better off if you would buy this : lynxmotion.com/Product.aspx? … egoryID=87.
and here you can see a it rotating a peice of tubing like you want :
lynxmotion.com/images/jpg/lpa03.jpg . but i think you would have to have an L rbacket to hold the other end (where the tubing isnt) to a base or something like that.

for your second question I would guess that it would fit since they say its standard size but I dont have one so I cant be sure.

Sam

Thanks for the advice,

I was looking to attach tubing connector hub and tubing directly to the horn and setup in this photo:

lynxmotion.com/images/jpg/asb16b01.jpg

It would give me a more slender configuration compared to using the brackets you suggest. Space is an issue for me. Do you think your setup would be stronger? Maybe less pressure directly on the horn/axis?

ok, i dont know what you could do, I dont know if can put a lot of weight on just the servo horn :confused: . maybe someone here wd know if you can do that. I think the configuration that i talk about would be strong enoug (I think) becuase thats waht on the images. anyway someone who knows more then me chould answer you soon I hope

Sam

I think it would be considering the fact that its made for that… :smiley:

what s made for what?? lol sorry dont undersand what you said :blush:

this is made for applying off axis pressure on the servo horns (basically not really sure if it was purposely made for it, but it does the job) ok!

lynxmotion.com/images/jpg/lpa03.jpg

Also, I recommend getting some aluminum servo horns to replace the plastic ones (just in case as I don’t know how much weight will be applied at the other end)

hopefully that was straightened out, if not what are you smoking at 12:48 in the afternoon?? :smiley:

WOOPS! scratch the aluminum servo horns. they wont work with the gears (unless you can get some aluminum ones)

srry

lol, i am not smoking anything. well he asked if he could atach a tube derectly to the servo horn, with only a hub (I think thats what he aked)

Im not even sure what he asked!! lol, maybe hes the one smokin it up?? :smiley:

No smoke in Sweden today,

I think Sam gave good advice but here´s my question hopefully more simply put : look at the picture;

lynxmotion.com/images/jpg/asb16b01.jpg

imagine a 6" tube attached to the center of the horn, carrying some weight at the other end. Wouldn´t that weight put wear on the horn and the gears inside? Usually stuff is attached to the horn the way it is on the servo upper right. I ve never seen pics of a setup like the one I m after.

Hello Peter (Pan :stuck_out_tongue:),

#1, I don’t think it is suggested to mount a lot of weight directly onto the servo horn. If you want to try this, get really nice aluminum ones. If possible, get a servo with metal gears instead of plastic ones. But as everyone else suggested, I will too, get: lynxmotion.com/Product.aspx? … egoryID=87 it is designed for this sort of task. I also suggest replacing those gears with metal gears. I don’t see replacement metal gears for it in the shop so PM Nick and ask him where he bought his metal gears for the low profile axis.

#2, I believe the HSR-5995TG servo will infact fit into the Servo Erector Set brackets. On the Servo Erector Set page it states:

under the “Digital Servos” section. If the servo is refered to on that page, then I believe that it will indeed fit into the SES brackets :slight_smile:

Cheers,
robodude666

P.S. You guys are the ones that are “smokin’ it up” :stuck_out_tongue:

crystal clear. thanks.

OK, understood fully. Ok so, indeed you will need an aluminum servo horn (my advice) because the plastic will break fairly easy (almost broke one putting in a screw). This aluminum servo horn will allow you to put up a fair amount of weight on the other end without bending ect.

The setup looks good, so I dont think you will have too muxh problem with that (as they are made up of aluminim brackets). I will however recomend a high torque servo to compensate the pressure on the other end). The HS-645MG should work great. HS-5645MG has more torque but dosnet bounce back as good when you smoke it (which u may according to load). this is a quote from Nick Reiser BTW.

I think that should do it :smiley:

Generally speaking the situation you describe is not healthy for servos. The longer the moment arm the harder it is on the servo. However, and maybe someone has taken one apart more recently than I can confirm or deny, the 2BB servos have a ball bearing at each end of the output shaft. Those servos should be better suited to handling this type of side load.

A better design might be to use a shaft rather than a tube and provide your own bearing support instead of relying on the servo.

actually yes, Eddie said just made the most sense in this forum…looks like all of us are smokin something. (BTW, why didn’t I think of that??)

good work Eddie!

smoking or non smoking - thank you all for your input.

nb 8)

Of course there is no way I can say for sure if a certain part will work for you. However if you use an HS-645 servo (it has dual ball bearings) with aluminum servo horns, it may do what you want. The LPA part should have no difficulty with doing this job.

The HSR-5995 comes with a integrated pivot on the bottom of the servo. This part will not allow the servo to be installed into the ASB-04. However if you increase the hole size (for the ball bearing) the servo will fit and you can install the ball bearing directly to the servo. Don’t dispare, the 5995 comes with a standard bottom part that when swapped out makes it exactly the same as a 645 or other standard servo.