HS=475HB Analog vs HS-5475HB Digital

Help & Support Robot Parts
1

Is it worth spending the additional money to get the HS-5475HB over the HS-475HB??

8-Dale

2

Dale, like your other post, depends on the application :wink:

At that price, I would go with a H645MGā€¦ More torque, more joy!

3

These would be going into the new front mounted 3DOF arm on W.A.L.T.E.R. v2.0. I am not at all confident that the HS-475HB analog servos can do the job with what I am going to add onto the end of the arm.

I just donā€™t want to spend more money than necessary to get the job done. Thatā€™s why I am wondering if the digital HS-5475HB would make enough of a difference over the analog HS-475HB.

8-Dale

4

You may need to explain in more detail what ā€œcan do the jobā€ involves. The servos have nearly identical mechanical performance specs, so unless you need some digital ā€œfeaureā€, you might just be wasting $$$ and getting unwanted ā€œdigitalā€ overhead.

5

There will be a total of at least 3 different sensors, a small camera, and a Little Grip at the end of the 3DOF arm. The servos have to be able to move all this around, plus whatever small objects are picked up in the gripper.

8-Dale

6

Below are the specs. For what you are asking, the only difference is one servo is 2x the price of the other. You need to determine how much torque will be required to operate the arm, and then find a servo that can supply that torque.

HS-475HB (76 oz. in.) Standard Servo
Description -
Size = Standard
Servo Erector Set = Yes
Range = 180ƂĀ°
Voltage = 4.8 - 6.0vdc
Torque = 76 oz.-in.
Weight = 1.52 oz.
Speed = 0.18s / 60 degrees
Full specs

Part# S475HB ] $17.99 USD

HS-5475HB (76 oz. in.) Digital Standard Servo
Description -
Size = Standard
Servo Erector Set = Yes
Range = 140ƂĀ° (180ƂĀ° capable after programming with DSP-01)
Voltage = 4.8 - 6.0vdc
Torque = 76 oz.-in.
Weight = 1.53 oz.
Speed = 0.18s / 60 degrees
Full specs

Part# S5475HB ] $34.99 USD

7

Again, Iā€™d go with a H645MGs if youā€™re willing to spend the money for a digital 475. The 475 isnā€™t a bad servo at all, but the analog 645s are about the same price and they are nearly twice the torque.

If youā€™re using it in the arm, take note that torque requirement increases as the radius from the center increasesā€¦

To move an arm, the base servo (shoulder letā€™s say) would need to produce a lot more torque then forearm, and etcā€¦

The gripper is a separate issue IMO. But the weight and the length that the gripper extends are all additive.

Also, are you using it in a continuous fashion? The amount of torque that it can produce and amount of heat it can dissipate will dictate how long a ā€œcontinuousā€ operation can be. hint: heat sunk servo such as the 5990TG will probably outlast a 5980SG if there was a blower on the extrusion of the 5990TGā€¦

8

I think I will go with the HS-645MG servos for all three joints of the arm on W.A.L.T.E.R. just to be on the safe side. I can get them converted to Open Servos eventually for full digitial features.

8-Dale