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servo recommendation?

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Old 12-26-2014 | 12:49 PM
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Default servo recommendation?

got a couple dhk razrs for my kids and the lhs guy tells me to be ready to swap servos cuz they're notorious for breaking. dhk will warranty them but i'm not really into swapping crap with crap so in the interest of keeping my kids engaged, i'd rather just replace them with a good one and be done with it. also, one of the mounting ears on my own car has snapped off so i might as well change that too, altho it's holding well enough with the one ear and mounting tape.
anyway, i need a recommendation. i'll be getting three of them.

lhs recommends hi tec metal gear hi torque? i think that's what he said. i'm not familiar. anything else to consider?
Old 12-26-2014 | 12:57 PM
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Definitely high torque/metal gear servo. Next question...how much do you want to spend and how fast do you need it to be?

Everyone has their favorite brands. I try and buy a great servo for mid range price. I don't look for a servo with gobs of torque that I don't need with the fastest servo motor I can get, 'cause now we're talking big $$$.

My first suggestion would be a $29.99 Hitec HS-625MG High-Speed 2BB Metal Gear Servo. Or if you want a little more torque a $29.99 Hitec HS-645MG High-Torque 2BB Metal Gear Servo. They are both mid range in price and performance. I have used the HS-625MG for many years in my stadium truck. I think it was about 6 years old when it finally crapped on me and I jumped up to the digital version HS-5625MG, but that one is $10 more.

Last edited by RustyUs; 12-26-2014 at 01:27 PM.
Old 12-26-2014 | 01:29 PM
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That's probably it. Price was right around $30
What's the difference between digital and analog servos? That is actually counterintuitve. I would think you'd want infinitely variable input on a servo

If the 625 and 645 are the same price why not get the hi torque?

Servos have speeds??
Old 12-26-2014 | 01:35 PM
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625 is faster with a little less torque and the 645 has more torque with a little less speed
Old 12-26-2014 | 01:40 PM
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Servo's speed is measured how long it takes the servo to rotate 60º from center in either direction.
Old 12-26-2014 | 01:46 PM
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HS-625MG SPECIFICATIONS
Speed: 0.18sec/60° at 4.8V
0.15sec/60° at 6.0V
Torque: 5.5 kg-cm (76.37 oz-in) at 4.8V
6.8 kg-cm (94.43 oz-in) at 6.0V
Length: 40.6mm (1.59")
Width: 19.8mm (0.77")
Height: 37.8mm (1.48")
Weight: 60g (2.11oz)

HS-645MG SPECIFICATIONS
Speed:
0.24 sec/60° at 4.8V
0.20 sec/60° at 6.0V
Torque: 106.93 oz-in at 4.8V (7.7 kg-cm)
133.31 oz-in at 6.0V (9.6 kg-cm)
Length: 1.59" (40.6mm)
Width: 0.77" (19.8mm)
Height: 1.48" (37.8mm)
Weight: 2.11oz (60g)
Old 12-26-2014 | 02:06 PM
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I have no luck with T-Pro servos. I bought a 5 pack of them good looking specs (too good to be true) servos and they all hummed and buzzed like crazy. I never have skimpped on servos since then.

To answer your question on digital.... The motors are usually the same in analog/digital servos. Digital servos process incoming receiver information faster and a tighter tolerance of where the servo motor is in relation to the signal. I guess what I'm trying to say is a digital servo is more precise.
Old 12-26-2014 | 02:36 PM
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gotcha. thanks for the info.
rustyus, if i ever meet you i'm buying you a beer.

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