Can I get a Continuous Rotation Servo that has (or can be modified to have) a through axle, please?
I’d be looking for:
speed range between 50rpm to 150rpm,
width over box (i.e space between ‘wheels’) up to 40mm max,
driven by analogue PWM signal,
axle ends to take ‘wheels’ with 3mm or 1/8" bore.
In the past, I’ve modified ordinary servos to rotate continuously. Sometimes I geared the servo to the axle, and sometimes I re-arranged the insides of the servo so I could drill right through the box.
Tech has moved on, there are better solutions now, and I’m lazy - what’s out there now, please?
Consider a servo + gearbox system: robotshop.com/en/pan-tilt-s … boxes.html
Ex: robotshop.com/en/servocity- … servo.html
This is used with a 785HB. We can obtain others for standard sized Hitec servos (so you can use the 1425CR from Hitec for example). Tell us what you need and we’ll see if it’s possible. Unfortunately Hitec compatibility only for now.
Almost all other RC servos don’t have a driven rear shaft (to the best of our knowledge).
Thanks, Coleman, I shall.
Funnily enough, I’ve just sketched out a design for one.
Is there a handy source of gear wheels that fit onto servos direct, like a horn does, please?
(I can find something similar on robotshop.com, but I’m not confident of what I’m seeing.)
[If I’m short of space for one, I’ll do what I’ve done before, which is to take the Pot and PCB outside the box, and run the axle right through the horn spindle. As long as the axle has it’s own bearings, the box just needs a slightly over-sized hole in its base.]
ServoCity offers quite a selection of compatible gears, though the pitch is what’s most important. Finding the spline compatible gear (like those above) tends to be the issue, though you can always 3D print gears (or laser cut) to fit onto a servo horn.
I like the look of this one: robotshop.com/en/24-tooth-4 … -gear.html
partly because it quotes the pitch and can be matched with other inch-standard gears, such as the lower half of these by Serv-O-Link, the Delrin chain people.
