2000 Series Dual Mode Servo (25-2, Torque) (GB-2000-0025-0002)

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The goBILDA 2000-0025-0002 is a descendant of the popular 2000-0025-0001 servo. The 25-2 received some noteworthy updates including an…

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what is the diameter of the gear at the top? Does it work well with Arduino with 5 volts?

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See: 2000 Series Dual Mode Servo (25-2, Torque) - goBILDA. That gear is a 25-tooth spline H25T (3F). Spline diameters are referenced here: Glossary (servocity.com). You can confirm that from the STEP file.

It requires a pulse voltage of 3-5V which is compatible with Arduino. Arduino pulse timing is set by the software but the PWM range of 500-2500usec is compatible with the most common defaults.

It requires a drive voltage of 4.8 to 7.4V from 150mA minimum to a maximum (stall current) of 3A, which would be provided from a separate supply (the Arduino 5V should never be used to power the servo).


Do you have any recommandation for separate power supply to drive the servo motor and connect with Arduino at the same time?


Jeff105671 via Core Electronics Forum <notifications@core-electronics.discoursemail.com>于2023年4月25日 周二上午8:20写道:

Are you powering this from the mains? The adapter you select will depend on your expected usage. For instance, if the servo is being used for light loads and is not going to stall, then you would get away with a 2A supply such as:
5V DC 2A Fixed 2.1mm Tip Appliance Plugpack | AM8904 | Core Electronics Australia (core-electronics.com.au)
If the load is heavier or there is any likelihood of the servo stalling than you should allow some headroom, such as:
5V DC 4A Fixed 2.1mm Tip Appliance Plugpack | AM8911B | Core Electronics Australia (core-electronics.com.au)
In either case you will need a splitter:
4-Way 2.1mm DC Barrel Jack Splitter | Adafruit ADA1352 | Core Electronics Australia (core-electronics.com.au)
and, depending on how you are wiring things up, perhaps
Female DC Barrel Jack Adapter (2.1mm) | Core Electronics Australia (core-electronics.com.au)
DC Barrel Jack Adapter - Breadboard Compatible | Sparkfun PRT-10811 | Core Electronics Australia (core-electronics.com.au)

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I would like to pull a weight of about 500 grams in 25cm using the servo motor with gear and belt (assume the weight is attached to the belt), Could I use batteries instead to get the power from the mains?

Jeff105671 via Core Electronics Forum <notifications@core-electronics.discoursemail.com> 于2023年4月25日周二 15:34写道:

The torque you need can be calculated from the weight and lever arm, plus an allowance for friction and headroom. See here for details. When you know the torque you can estimate the maximum likely current draw.

Batteries are perfectly OK for powering the Arduino and servo, provided they have the capacity. A 5V battery is not common, so you would probably use 12V either lead/acid or LiFePO4, with a DC-DC converter.

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Could you please help me find a set of equipment that can be used on the Arduino including the servo motor and two gears needed for the motor, the transmission belt embedded can in the gears, and the power supply system that is adapted to the 5v voltage?

The attached image is the sketch of the project.


Jeff105671 via Core Electronics Forum <notifications@core-electronics.discoursemail.com> 于2023年4月25日周二 18:12写道:

Hey Peng,

With that amount of weight being moved, id expect there to be quite a bit of torque required, using the guide in Jeffs link to measure the requirements would be handy to use so that we can get an idea of what to best suggest.

Out of question, would you be looking at having any support under that belt? With that kind of weight I can only assume the belt itself would fail if it doesn’t have any roller supports or other form of support underneath it?


If we now decide to use Standard servo - TowerPro SG-5010 - 5010. What is the Spline diameter for this motor? and Does this motor has compatible gear with an approximate width of 6mm on the spline and a belt?

Blayden via Core Electronics Forum <notifications@core-electronics.discoursemail.com> 于2023年4月26日周三 13:48写道:

Hi All
How is a servo going to drive the set up suggested in that sketch. Surely a stepper or brushed motor would be better.
Cheers Bob

I would like to drive the weight which connects to the belt to stop at a certain position, I think the servo motor is sufficient, and I could set the number of the rotation by using Arduino IDE. As I know, the stepper motor needs another board to set the position of the weight.

Robert93820 via Core Electronics Forum <notifications@core-electronics.discoursemail.com> 于2023年4月27日周四 17:20写道:

Hey Peng,

The servo may be a better choice with the feedback aspect in mind. The Standard servo - TowerPro SG-5010 - 5010 has an approximate 6mm spline (I measured it at 5.55mm) and it comes with a range of horns that could be attached to a belt system, however they do not come with a belt attachment for the horns.

Keep in mind, those are cheaper and so less reliable servos, they aren’t recommended to be relied upon for breakable or sensitive parts due to this.


Do you have any recommendation for this servo motor‘s horn?medium sized horn.

Blayden via Core Electronics Forum <notifications@core-electronics.discoursemail.com>于2023年4月28日 周五下午1:17写道:

Hi Peng
That servo will rotate 300º in a controlled manner. To drive a belt 25cm with a 300º rotation will require a drum with a diameter of 95.5mm. Nearest one would be probably 100mm. You want to move 500g. Is that vertically or at what angle. I think this has to be known to work out what torque is required or use worst case and assume vertical. At 6V this is supposed to have a stall torque of over 20kg / cm. So with a drum of 10cm Diameter this would be about 4kg at 5cm from centre. You want to lift 500g which is a factor of 8 so I think you would have a lot of losses for this servo not to be OK.

Some of the mechanical engineer types might like to check my (rough) reasoning and offer comments before committing to purchase.
Cheers Bob

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