
feroze
USA
Asked
— Edited
Hello,
I would like to expand my kit and buy a few more servos. What do you recommend?
I have noticed a couple different price levels.
Hitec 33322S for $11.41
Hitec 33322S Amazon
or
Hitec 35485S $19.88
Hitec 35485S Amazon
Are these good servos to work with the EZ-B? Why is there a difference in price? What are the benefits of more expensive servos? How much should I be paying for one standard servo?
Thanks!
33322S Torque oz./in. (4.8V/6.0V): 42 / 51
35485S Torque oz./in. (4.8V/6.0V): 72 / 89
Depending on their use you may need high torque or you may get away with a cheaper one.
Prices, I don't know since I'm UK based.
What do you need the servos to do? Ideally (although few ever do) you should calculate the required torque. Generally I just throw the high torques in everything now to be on the safe side, it costs more but I wasted too much on Melvin when I was going cheap.
HiTec 33322S Amazon
These servos seem to be comparative. Will they work with the EZ-B?
Personally I use the 995MGs Josh mentioned, they are high torque and metal gear so can handle pretty much anything I throw at them. I learnt when I was messing with Melvin's arms that cheap isn't good, I spent more on rubbish than the good ones cost in the end.
Also, be careful where you buy. There are a lot of counterfeit servos out there. By that I mean cheap knockoffs from China which aren't very good. I made the mistake of buying a bunch on ebay and, well, I wish I hadn't. If they are priced too cheap then be careful
MG995 Amazon
Do they require an alternate power source? Or can they be powered from the EZ-B? I know some metal servos need an alternate power source.
Which would you recommend the Hitec ones of the MG995, they are about the same price
I have only used the MG995s so can't really compare them but I have no problems with the MG995s other than a browning out issue with the LCD screen (the EZ-B only supplies 5A I think, which was not enough for 2 servos and the LCD so I had to supply the power externally).
If you use anything else you need a 6v regulated circuit, I use an Etronix regulator. This connects on to the battery, from that you can take it to a distribution block, strip board or whatever and then on the servo, connect the red & black (or whatever colours the vcc and ground are) to the 6v supply.
I will use alternative power in the future, but for now I just got similar servos to the ones that came in the EZ-Robot kit. I compared the specs of the Hi-Tec servo with the Futuba s3003 and the specs were close to the same.
The torque at 4.8v was 42 for Hitec and 44 for Futuba. The speed was about the same too.
So I decided to go Hi-Tec servos because of prime shipping. They should work directly with the EZ-B right with no alternative power source. Also all standard servos should be the same size right? So these servos should fit the EZ-Bit mounts correct?