Micro Servo

Question

Hey guys, Does anyone know what brand the new Micro servo that comes with the grippers is? I seized one up (or burnt it out) and need to get another one.

I'm just assuming the international shipping would be pricey so I'd like to find a substitute with the same dimmentions.

I did some looking on ebay and couldn't find one that matched the dimmentions on the EZR site so I'm wondering if anyone knows what servo they went with.

Thanks in advance.

Dave Schulpius · Answer

Looking at the gripper they are selling in the shop it states that it has a HD servo motor installed not a micro servo. After reviewing the specs on EZ Robots HD servo I don't think you'll find one as reasonably prices at $12 USD. The closest one I can find to EZ Robot' s HD servo is a Futaba BLS-172SV at servo City for $219 USD. I'm not sure but if you go with a different brand then EZ Robot you may find they move at different speeds. You may need to adjust your scripts it compensate. This is just a guess as I don't own any of the revolution robots and haven't messed around with how they work yet. Servo City / Futaba BLS-1725v
 Control System: +Pulse Width Control 1520usec Neutral Required Pulse: 3-5 Volt Peak to Peak Square Wave Operating Voltage: 6.6V ~ 7.4V Volts Operating Temperature Range: -20 to +60 Degree C Operating Speed (6.6V): 0.12 sec/60 degrees at no load Operating Speed (7.4V): 0.11 sec/60 degrees at no load Stall Torque (6.6V): 472.3 oz/in. (34 kg.cm) Stall Torque (7.4V): 513.9 oz/in. (37 kg.cm) Operating Angle: 45 Deg. one side pulse traveling 400usec Continuous Rotation Modifiable: No Direction: Counter Clockwise/Pulse Traveling 1520-1900usec Motor Type: 3-Pole Motor Potentiometer Drive: Indirect Drive Bearing Type: Dual Ball Bearing Gear Type: Metal Gears Connector Wire Length: 12" Dimensions: See schematics Weight: 2.61oz. (74g)

EZ Robot's HD Servo:
 Operating speed: 0.24sec/60degree (7.4V) Stall torque: 15.0kg-cm/529 oz-in.(7.4V) Temperature Range: -20C to +60C Operating Voltage: 4.8V to 7.4V 3 pole ferrite Dual ball metal bearing All metal gears connector wire length: 32cm Futaba 3f (25 teeth) for driving spline/shaft 6.2mm spline (including teeth

Antron007 · Answer

My mistake. I should have been clearer. I have the grippers that came with Roli. It's an HD, metal gear micro. But thanks for the other info. It may come in handy one day

CochranRobotics · Answer

The grippers do use the micro servo. I don't know the brand or anything but am monitoring this as I too have one that I need to replace.

Rich · Answer

Any HD Micro servo which can handle 8.4v max will do. Dimensions of the EZ-Robot micro HD servo are Length: 29.11mm (not including tabs) Width: 13.75mm Height: 30.40mm (not including spindle)

Antron007 · Answer

Thanks Rich. I'll look to see what I can find.

Antron007 · Answer

Doing some interneting I've found that the Hitec HS-85MG Metal Gear Micro Servo is the closest match at 1.14" x 0.51" x 1.18". It's just a couple mm smaller overall. They are a bit pricey so if someone finds an alternative that works in the claw I'd like to know. Thanks again guys.

Dave Schulpius · Answer

The HS-85MG is only rated for up to 6vdc according to ServoCity's chart. However it is an analog servo. The HS-5070MH is rated for 7.4vdc but is digital and even more expencive then the HS-85MG. Digital is good but they are a little noisy when trying to hold position. Either way you'll want the HiTech C1 standard spline and both these have that.

jstarne1 · Answer

15kg cm is 208.2oz in torque. Just gotta remember to convert cm to inches. So yea there are a handful of servos with that power. Like a power HD , 240 Oz in @ 6 volts. The EZ-Robot HD servo is strong and a great price! It is not as strong as a couple of these posts implied.

TheRat · Answer

Hy,

the ez-shop indicate a standard micro servo for the grippers with 44.4 oz-in of torque : https://synthiam.com/Shop/AccessoriesDetails.aspx?productNumber=13

I think 15kg/cm of torque is a mistake, 44.4 oz/in make 3.19 kg/cm for me.

Maybe Turnigy TGY-S310 could make the job. (google it )

(I use many of HS-85MG in my rc sailplane )

Antron007 · Answer

Thanks for all of the info guys.

Antron007

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