Okay so Im sitting on the couch thinking of this wooden biped I’m going to make.
I was gonna go to home depot and purchase 1/4" mahogany wood strips, cut out parts and screw them onto the servos. I realized it would be tough to mount the back of standard servos in a non-ghetto way, basically it would be hard to mount the side opposite the horn onto the wood.
All the crafting tools I was gonna purchase, the glue, the semi gloss finish, the sand paper, wood…with all the money going into that…i could just buy all the brackets i need and it would save me not only money, but the time as well.
So…Ive decided as my new plan, Im going to invest money into TEN sets of those black anodized C brackets. Hows that for starters? Tell me your joys of using them so I can feel safe when purchasing. Should I buy the long ones or short ones? Also…I noticed C brackets also need something else to mount the back of the servo to…what is this piece Im seeking?
Check this out: lynxmotion.com/images/jpg/asb032.jpg … notice the back of the servos, they are mounted through that little “dot” thingy, what is that?
BTW - big problem if I buy these brackets. They fit “standard size” servos. What is the standard size? I want to buy MG995 towerpro servos, will they work?
But you also have to think about how you are going to mount the servo. If you mount it using the Multi-Purpose Servo Bracket, then you don’t need the servo hinge:
I think this a common way of doing it, but I haven’t used them, so I’m not certain. But most of the robots that I have seen use the brackets. They look great.
You’re going to need more than just C brackets. At the very least you are also going to need Multi-Purpose Servo brackets. I recommend using the 3D models to design your biped first. That’s what I did, but I’m probably not going to build it until next year. Or you could consider the black anodized BRAT or Scout kits as a starting point.
The SES is killer so I think you are making the right choice for the long run.
That multi-purpose bracket was exactly what I was thinking about. Thats the piece I thought I need.
I require 1 multi-purpose for every 1 C bracket right? And guys, what is a “standard servo size”? I need to know before purchasing otherwise my towerpro servos might not fit.
yes, 1 AllPurpose Bracket for every C bracket. A standard servo that works great with the Lynxmotion SES are Hitec and Futaba with the measurements of 1.6" x 0.8" x 1.4"
Numbers in an ad are one thing - actual real-world performance is quite another.
I haven’t had the (mis)fortune to work with them myself, but others here, and on other forums, have reported numerous failures and performance issues with them. you mileage may vary of course, but judging from what I’ve heard here and elsewhere, the lower price isn’t worth the hassle or heartache in dealing with them, and many who have been lured into using them by the lower cost have given up on them and gone with something else instead.
There was quite a discussion about them a little while back. you can probably find it by searching the forums.
just go do a little reading on some other r/c forums and you will discover soon enough. their price and advertised specs lure many people into wasting money. maybe if you put them in an r/c trainer where they run at about 10% of their advertised capabilities they might work fine… who knows. if you persist on trying to put them in a robot make sure you buy a lot of spares to save on shipping costs. from what I’ve read in the past I wouldn’t put these things in a BRAT and (if I remember correctly) it’s designed to use hs422 servos.
ive read all the other threads on this forum about these towerpro servos and also rcuniverse’s forum…
everyone complained it was too shifty (jittery), it couldnt hold, the insides would break, it wasnt digital but they still use “digi” to try and lure you, and that they take parts off of futaba and hitec to build these, and they styll crash.
man, i really thought cheap but quality servos would be a reality for someone as “poor” as i am. guess not …
I think the common advice given to folks on a tight budget is to save for the quality parts and just build up slowly. The SES is really great in that you can start with something simple like a brat jr and upgrade it over time to more complex assemblies. If you know you are shooting for a 22-servo full biped then when you buy parts you keep the end requirments in mind. For instance, even though a brat jr can probably do back flips with hs5645 servos, you can still buy them for it rather than its minimum required hs422 servos so that when you go up the project tree you will have the right servos when you finally get to the full biped.
Up until recently, I had only ever used low- and mid-range analog servos. Then, I acquired a handful of Hitec 5645s. I was, quite frankly, blown away. the geartrains are far smoother, the action is far more precise, and the build quality is fantastic. I had been expecting a slight improvement over the analog units I was used to, but nothing even close to what I got.
I feel that $55 per axis isn’t half bad, as compared to the same mechanism built with a $12 servo at its core.
Do they cost more? Yes.
Do you get more servo for your money? Yes.
I know this is an old topic but wanted to offer some advice on the Towerpro servos. I’ve been using all 645’s on my BRAT and now, Biped Pete and thought I could save some bucks by using some cheapos at least for a short time. I got 4 Towerpro 995’s from Hong Kong on eBay for $40 incl. shipping. They came in about a week and a half and seem pretty solid. The part I didn’t anticipate was the size of the horns. They are much thicker than the Hi-tecs and do not fit in the C brackets. I dremeled the heck out of two of them and managed to get them to sort of fit but it basically defeated the purpose of the ball bearings on the opposite side since it pulled the bracket right into the multi-purpose bracket. I made 2 of them the shoulder joints and will use the other 2 for elbows for now but am ordering 4 645s or 5645s immediately. I haven’t been able to test the torque or performance yet as I couldn’t get them into the brackets to compare but I’ll update again after I see if they’re worth a darn for anything else that doesn’t need to fit into a C bracket.
no towerpro servos are not tower hobbies servos. they are the unbelievable torque for the cost wonder servos that aliens have sent plans to earth for so we can all marvel at them and reference as we complain even more vigorously about the cost of quality servos. search the forums luke… you might even discover the thread where someone built a scout using this garbage… and after watching the video discover why we refer to it as the parkie scout.
My first thought was to buy all aluminum horns until I tried to put one of the plastic ones on the Towerpros. They didn’t fit at all so there was no way aluminum ones would fit. I dremeled the horns down to nothing and they sort of fit but so little of the teeth were left inside the horn that it wouldn’t have any torque anyway. I’m OK with the arms being jerky for now since I wouldn’t have arms anyway. The main thing is to get 4 more good servos for the left leg. He looks stupid with only one good leg and I’d wager that he wouldn’t walk too well either
Towerpro servos (aside from being complete crap) use a futaba servo spline, different number of teeth than the hitec ones that Jim uses. Hence the servo horns wont work.
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