I was/am looking to buy some 3rd party arms/horns....
But I have NO CLUE how many teeth the 'splined' (gear? nub?) has? 23T - JR 24T - HiTec 25T - Futaba
Not sure if this Radioshack standard servo (2730766) falls into ANY of these categories?
Anyone know? Or help point to a reference? Googling hasnt turned any definitive answers for me
That being said... this does have a plastic splined 'nub/gear' (what is the appropriate name for that?)
And I -do- need to get another one (2 in total).. so maybe it would be best to abandon this one? And get 2 news one that are metal? -AND- a known tooth count for the splined gear thingy?
I'm not opposed to getting new one... but also dont want to 'break the bank' on these either.
I would PREFER the same size: Size:38.6x18.8x34.9mm
so it will fit nicely in the area already sourced/machine out for it..
Not really experienced in this area.. so if there are other arms/horns to checkout? or a some 'go-to' servos....please share!
Alternate question:
How would go about trying fix/secure/mount some CUSTOM arms to a servo?
Say I wanted to laser cut my own out of some acrylic or wood or something? I need to (somehow) get the shape of the 23/24/25 tooth outline.. so I can laser cut it, into the parts itself?
Or is there a pre-made part that you attach that allows for custom arms (shape/length) to be used?
Most of the horns/arms are just specified by tooth count... (never saw anything about the OD!)...
but makes sense as the micro servos have a small OD 'shaft'.. (dammit!) HAHA..
I tried to count them last night... I -thought- I came up with 23... but just wasnt confident. (and then started searching, which came up blank).. I find it hard to believe this isnt documented somewhere?
You likely stand a better chance of getting an answer over in the RC Groups forums, I guess almost 99% of the users of that forum will use servos, only a small % of Arduino users will be regular servo users.
I've got servos with I think 24 and 25 spline shafts. It is tedious, but I just counted the splines. I did note that the the white servo horns had one count, and the black servo horns seemed to have the other count.
However.... I guess I am in the same situation with those as well?
what is the spline tooth count?
I see this:
Compliant with most standard receiver connector: Futaba, Hitec, Sanwa, GWS etc.
Which is it? My understanding (which may be inaccurate) is that Futaba and Hitec have different tooth count on the spline.
And while they do some with some plastic arms/horns.. none of those will work my project.. needs t be longer.
also look to be a bit bigger physically...than the RS standard servo size.. (which I machine out a little packet in my aluminum plate for it to sit in..... I guess I could make another pass to widen it up?.. so not a deal breaker)
I looked in my stuff and found a Hobbico standard CS-61 servo, which is probably identical to your RS servo. i put some dots on opposite teeth and started counting. Then I got my LG cell phone and found that it can zoom in some, so holding the servo and phone I took the below picture. Having the servo on something solid would probably steady the focusing. It looks like this has a 24 tooth spline. If you have a cell phone, you might try something similar to count the teeth.
In the end, those Standard Radioshack servos just do NOT have enough torque to move/push what I need it to.
But I guess at least there is FACTUAL information on what spline tooth count it has. (and now I have 3 arms with 23T count..that I doubt I'll be able to use in the future!) LOL
Now, I"m on the 'hunt' to find some similarly sized servos... but that have much more torque.
Q1: Does just having metals gears mean more torque? (by default, I'm sure more than plastic gears)
Q2: Is there anything else to look for to ensure hi-torque ability? (just the stall torque?)
You have not told us how far the thing connected to the arm must move. You can always multiply the torque by shortening the distance from the drive shaft to the connecting point on the arm.
However.... I guess I am in the same situation with those as well?
what is the spline tooth count?
I see this:
Which is it? My understanding (which may be inaccurate) is that Futaba and Hitec have different tooth count on the spline.
And while they do some with some plastic arms/horns.. none of those will work my project.. needs t be longer.
also look to be a bit bigger physically...than the RS standard servo size.. (which I machine out a little packet in my aluminum plate for it to sit in..... I guess I could make another pass to widen it up?.. so not a deal breaker)
Obviously you missed the point of the change to the MG servo.
Idea was to trash the radio shack gear and use a common brand which already has 4 sets of arms provided.
So 3 spare sets per servo once you use one on your project.
Servo arms , no matter which brand, will not be any longer than provided as shown.
As far as I am aware, spline count is the same as Futaba (25).
For torque requirement you will need to know what amount of weight is placed on the round bar @ the 2" mark. I suspect the poster of the video had problems also as the obvious use of 2 servos.
Not really a good setup to have output arms fixed together given no 2 servos are exactly the same in travel or speed.
A gram is not torque, it is weight and Google is a good reference in case you haven't heard of it.
