This could have gone in the arm section or this but anyway! If you’ve seen my other posts, you will know i’m building a replica of the Lynx 6 but made from aluminium. I know i can buy the kit, but i want to “make” one of raw materials etc. (not the electronics)
So, can i simply use different servos i.e. digi servos, in the arm? As they are roughly 2-3x more expensive is the price really justifyed for what they do? I was planning to use the 475HB, so do you think i should change or swap. Please note i’m on a kind of budget, so if i went digi, it would take me longer to save up for etc. Can anyone reccomend any “starter” digi servos or “good” analogue. Note: this is the first time i’ve done anything with servos, so a bit of advice is needed please!
Also, do the digi’s work with the ssc-32? Can you mix digi’s and analogues? or not? So, apart from buying them, is there anything i need to do to the ssc-32 or the software, to make digi’s work? or is it simply “plug and play” for both the analogue and the digi’s?
Sorry for all the questions, just need to get things a bit clearer in my head!
Dan,
This is an excellent and brief article on the differences between the two, analog and digital . futaba-rc.com/servos/digitalservos.pdf. Digital - Faster response, more holding power, smoother operation, higher cost.
You can mix the two as long as they are not operated as pair (i.e. on the same electrical channel or the same mechanical joint).
Digital servos are plug and play with the SSC32.
I would recommend a programmer should you get the digital servos (I know, I know - ouch to the wallet - but if you have a future in playing with servos this is a long term investment). As far a a recommended servos that depends on your application - sorry cant help you here.
The SSC-32 will “work” with digital servos, but it cannot take advantage of any of the ‘digital features’.
You’re better off spending your money on higher-power analog servos, I think.
I think I will start off with analogue, as this is my first project. I’m concentrating more on the “mechanical” side (i.e. the screws and washers) as sad as it sounds. And then my plan is to just “bung a load of 475’s and a SSC-32 in”
Also, is it true about, jsut giving them (the digi’s) one position and they hold? or is that a myth? So would it be a kind of weak worm gear type hold - providing you don’t strain more than the torque obviously.
To the best of my knowledge there are no “digital features” that can’t be taken advantage of with the current digital servos. I mean the most important “feature” is strength, which clearly the SSC-32 has no effect on. Other features are some adjustable settings which the SSC-32 or any other servo controller can’t effect, but the servo programmer can effect. However if Hitec ever does release the robot protocol standard format digital servos, it’s true the SSC-32 won’t be able to take advantage of the feeback.
I intend to do an exact copy of the Lynx6 made from aluminium, and i understand that they use 475HB’s, so it should be fine, but if it is differnet, i can just change the size on the CAD file and get my cnc milling machine to cut it out a bit bigger. Can someone just confirm the Lynx6 uses 475’s???
Mine came with HS-475HB servos on all axes except for the base rotate, wrist rotate, and grip.
The base is an HS-422, wrist rotate is an HS-85BB+, and the grip is…umm…well-hidden. The Lynx-6 page says that it’s an HS-81, and I have no cause to dispute this assertion.
My guess would be that since the output shaft isn’t actually supporting any loads, and that the only real stress that it works against comes when it’s actively rotating, it was more economical to use a lower-torque standard servo there. The other joints are all going to be experiencing some sort of torque loading when it’s in operation, but the vast majority of the force that gets transmitted to the base rotation mechanism is taken up by the nylon standoff/sliders.
