What the newest cheap servo hotness?

[Browneye]

On Savox 0231...

>snip
I just wouldn't recommend buying another. They are painfully slow and very weak compared to the $15-20 waterproof cheapies. They'll last for the same reason a Toyota transmission will last 500k miles, because there's no power to stress it. At the very least pump some power into it, Savox reps actually tell people they do 7.4v despite being rated for 6v.

I'll bump it to 7.4 and see what it does. I'm not in the habit of over-powering electronics. :twisted:

So, what IS your favorite flavor for use with a 3amp bec? All of the ones in that vid except for the TRX one are well over at stall, some twice over.

The 'power hd lw-20g' or whatever? I'd be willing to give one of those a shot.

I haven't had stripped teeth, but have had wobbly output shaft. But then I don't pull them apart - if they're not right I toss them.

 

[Hydrocarbon92]

I'm trying out the Henge 8A/12A UBEC, so far it's fine running a 20kg and 32kg servo at 7.4v (4ws). I've seen a few Castles fail (but there are a lot out there), but I dislike them mainly because it's another $20 to adjust voltage. A $0.20 pot could do that. If I did spend $30+ on a UBEC it would be the 20A monster from Hobbywing or the YEP from Hobbyking (clone of a $100 German unit).

I could take a picture of my savox, tower, and assorted Taiwanese junk, not sure why proof is needed.

I'm not asking for proof you aren't lying, it's so people know what models suck & why. Simply saying [in so many words] "nothing else can possibly work AT ALL, EVER, unless it's Promodeler" isn't very insightful.


I've been on enough forums in the last 2 decades to know there are as many fanbois that throw logic out the window as there are people that take 1 failure as a completely accurate representation of a MFG. Holmes has fantastic products, but you wouldn't know if you only read a few posts about his early servos.

I've also seen PLENTY of people that beat the absolute piss out of their stuff and never mention that when they talk down a failed product. In almost every cheap motor thread you'll see someone say "they all failed me" next to a post stating "I and 4 friends have run dozens of these for years no prob". Then you dig and find the first guy runs 2-3S motors on 4S with maxed-out gearing doing 30ft longjumps and fording 12 inch deep mud pits.

Another decade long experience comes from making & selling my own products: 98% of problems have been user error. The latest one was a guy who installed his injector lower seals wrong AND didn't remove the factory shims the thicker seals replace - and he wonder why it ran poorly. I'm not saying cheap china stuff won't break, I'm saying it's not uncommon for humans to err on occasion.

 

[mikemcE]

I’m sure a number of my failures were pilot error. Wrong EP, impact, not enough amperage, too much voltage. My issue was I was buying stuff per “recommendations” and most of mine were gear failures, due to me beating it and high power brushless Power, with sticky tires and knuckle weights.
I’m not anyone’s fanboy, I’ve torn up numerous Holmes servos also. The PMs gears are just that tough, and never a bent pin as I’m aware of.

If you’ve followed along with OPIE, I beat the snot out of it...... I don’t run a light weight scaler, but run rip rap only

Hang up and Drive

 

[TheLetterJ]

Ha! Small world. I've ridden with you before, in a large group anyway. LA-B-LV '11? '12? Maybe one of the "LA area adventure rides"? Hard to forget when someone willingly introduces themselves as Browneye! I'd have been the freakishly tall dude on a 690, my best riding buddy still rocks a TE630. I haven't been able to ride for almost 3 years which is why I jumped back into rc, balls deep! I haven't sold the bikes yet, but if I have to keep buying servos, I might have to!

 

[gonper]

I think the real prob is you aren't understanding the specs listed. That servo lists clearly: "Max frequency: 500-2500us; Max Rotation Angle: 180°/270° Optional". That means IF you can feed it 500-2500us signals, it will give you 180°. If 1000-2000us gave you 180°, then 500-2500us would give you 360° - that's just impossible with a typical servo design. You'd need an optical or magnetic sensor like the servo in my last link below. Keep in mind Aliexpress is like a fleamarket in the sense they only care that they get their money & you get your item. Their price does NOT budget marketing, instructions, nor tech support.

I think you are completely right, sorry. :shock:
I did not get that detail from the specifications. And I just noticed that the Aliexpress shop is a robotic one so the specs are correct for the people that usually buy from them.
I am not use to robotics so I made the mistake :roll:, and others did as well.
That is why they said that the 270º one turns 180º with standard RX signal.

Thank you again for your input and sorry for the misunderstanding.

 

[durok]

A not-very-helpful post that does however, contain a couple pics:

 

[Hydrocarbon92]

Actually durok that pic is interesting for another reason. The HH and JX appear to have identical cases, main gear, and wiring. The JX just has extra cosmetic machining. I'd be interested to see how different the gears & motor are (or not).

I’m sure a number of my failures were pilot error. Wrong EP, impact, not enough amperage, too much voltage. My issue was I was buying stuff per “recommendations” and most of mine were gear failures, due to me beating it and high power brushless Power, with sticky tires and knuckle weights.

Thanks for clearing that up. I guess it's safe to say the PM takes an absolute punishment & would be the solution to anyone that trashes one of the $25-35 servos listed here.

Looking at your gear pic & pics of the HH replacement gears makes me wonder what gear usually broke? Most of the broken gears I see are the low center gear that takes power right off the motor gear. The 959 gear issue listed earlier was the final gear.

 

[mikemcE]

Actually durok that pic is interesting for another reason. The HH and JX appear to have identical cases, main gear, and wiring. The JX just has extra cosmetic machining. I'd be interested to see how different the gears & motor are (or not).



Thanks for clearing that up. I guess it's safe to say the PM takes an absolute punishment & would be the solution to anyone that trashes one of the $25-35 servos listed here.

Looking at your gear pic & pics of the HH replacement gears makes me wonder what gear usually broke? Most of the broken gears I see are the low center gear that takes power right off the motor gear. The 959 gear issue listed earlier was the final gear.

Top middle gear, missing here, no bent pin.

That gear is the biggest difference between the PM and the rest.

Hang up and Drive

 

[durok]

Actually durok that pic is interesting for another reason. The HH and JX appear to have identical cases, main gear, and wiring. The JX just has extra cosmetic machining. I'd be interested to see how different the gears & motor are (or not).

As I posed the beauties for their glamour shots, I did note the extreme similarities between the two... "thumbsup"

perhaps at some point I'll disassemble them at least partway. I'm not someone that thus far has prepped my gear for water-resistance though...

 

[whitrzac]

So what's the go-to <$40 servo that I can turn into a winch?

PowerHD causes issues with the winch controller, the HK15328 are a little lacking in torque and speed...

 

[Hydrocarbon92]

It depends on how you're making it a winch. If adding a bobbin to the output & replacing the pot with resistors, the TowerPro MG958 is probably the best bet. If putting a spool inside and using an external controller that feeds the motor direct, probably the all-plastic version of the JX 6221.

What controller do you have?

 

[StomperCrawler]

What about the DS3218? I hear it puts out 277oz torque on 6.8v, includes an aluminum horn, and runs just $13 shipped from Aliexpress.

 

[durok]

What about the DS3218? I hear it puts out 277oz torque on 6.8v, includes an aluminum horn, and runs just $13 shipped from Aliexpress.

I got mine from a seller on Amazon, so there are plenty of reviews there...

It's sold as a 180deg and a 270deg, doesn't matter which you get for our applications, though.

Mine just so happened to be a 270deg (because I didn't really pay attention).

 

[mikemcE]

Well Im building a cheap rig, we will see how long this lasts.
JX Servo PDI-HV5932MG

But for $30. shipped it might be a bargain ....... Time will tell

 

[dweano]

Well Im building a cheap rig, we will see how long this lasts.
JX Servo PDI-HV5932MG

But for $30. shipped it might be a bargain ....... Time will tell

I have a bunch! I like em. Nothing crazy but they turn the 40 series Mudslingers on my Traxxas Summit quite well. I killed one before... but that wasn't after alot of abuse. Gear stripped

 

[mikemcE]

Well Im building a cheap rig, we will see how long this lasts.
JX Servo PDI-HV5932MG

But for $30. shipped it might be a bargain ....... Time will tell

Well... no go sudddenly on backorder! so went a bit more pricy, but waterproof for 35.00..... 420 oz ?

JX Servo 30KG Waterproof High Voltage Coreless Metal Gear Servo #CLS-5830HV FREE SHIP,

 

[TheLetterJ]

I just don't know about those aluminum gears, at some point the torque applied exceeds the materials strength, and 30kg seems to be enough to do it. That was the case with my 30kg mg959v2 anyway. If I could find replacement gears, I'd happily keep running it, but I fear its on borrowed time now since I already 180°'ed the output gear to get some new teeth. Speed and torque have been great otherwise.

Are there any cheap 20kg+ servos that use steel gears?

 

[mikemcE]

I’ve yet to find them, usually in the 49.00 range


Hang up and Drive

 

[mikemcE]

I just don't know about those aluminum gears, at some point the torque applied exceeds the materials strength, and 30kg seems to be enough to do it. That was the case with my 30kg mg959v2 anyway. If I could find replacement gears, I'd happily keep running it, but I fear its on borrowed time now since I already 180°'ed the output gear to get some new teeth. Speed and torque have been great otherwise.

Are there any cheap 20kg+ servos that use steel gears?

My thought was to run this on at 6v for 343oz make it a bit easier on those little gears.
Im getting leftovers together for a quick fun build....odd, no working servos laying around.......

 

[StomperCrawler]

Well... no go sudddenly on backorder! so went a bit more pricy, but waterproof for 35.00..... 420 oz ?

JX Servo 30KG Waterproof High Voltage Coreless Metal Gear Servo #CLS-5830HV FREE SHIP,

They're available on eBay too: