Erco: Standard size DC-operated CR servos?

GordonMcComb

Erco, my fine scavenging friend, what are the options for standard size CR servos that are direct-DC connection (rather than servo signal)? I know you have some that are mini/micro, but anything with more torque?

Yes, I know regular servos can be readily hacked to connect directly to the motor, but I'm looking for something factory-made.

erco

Good question, and I know EXACTLY what your secret motivations are. The only servo-form-factor gearmotors (AKA gutted servo) I know of offhand are the 9-gram types sold by Feetech and Adafruit.

Will poke around when I have more time and advise if I find anything. I'm busy lasering at moment.

Duane Degn

The only servo shaped motors I'm aware of are the small ones.

You're likely already familiar with Dagu's Little Black Duck motors.



Dagu also sells these with small wheels. (Edit: Apparently the ones with the wheel include the servo electronics.)



Good luck in the search.

xanadu

Like this? - https://wiltronics.com.au/product/7255/dc-motor-servo-case-4-12vdc/

Not cheap... Dimensions are 50x20x55mm so it's not a 9 gram.

erco

Jolly good sleuthing, Jon! I sought but did not find... You da man!

Seairth

Here's another one:

https://solarbotics.com/product/gm4/

GordonMcComb

Yeah, for $8+ you might as well go with the Solarbotics plastic "WowWee" motors; for $15 the Pololu micro metal gear motors are the far better deal (though you also need to buy the mounts):

https://www.pololu.com/product/2367

There must be a market for a DC motor in a standard servo case, because many of us have been looking for years. But it needs to be cheaper than the alternatives that are actually better motors. Strangely enough, the makers don't seem to be supplying that market, or want too much for them.

The imported yellow case motors (using the Solarbotics GM2/3 form factor) generally lack quality control, or they'd be just right.

erco

GordonMcComb wrote: »

for $15 the Pololu micro metal gear motors are the far better deal (though you also need to buy the mounts): https://www.pololu.com/product/2367

Surely you jest.

http://www.ebay.com/itm/DC-6V-30RPM-Mini-Metal-Gear-Motor-Gearwheel-Model-N20-10mm-Shaft-Diameter-MY-/360897904681

Beau Schwabe

Alibaba has them for $1 with a position encoder

https://www.alibaba.com/product-detail/N20-3v-6v-dc-micro-metal_60159974835.html

erco

Beau Schwabe wrote: »

Alibaba has them for $1 with a position encoder

In the true spirit of Christmas, Beau has shamed us all...

JK, you ROCK, Beau! Merry Christmas, now when are we having drinks on the Queen Mary again?

MikeDYur

Check that ad again, it looks like "$1 - 13 / piece".

RS_Jim

are they using - instead of a period $1.13 $1-13?
Jim

MikeDYur

RS_Jim wrote: »

are they using - instead of a period $1.13 $1-13?
Jim

That's probably it, erco didn't comment. He was busy grabbing the lot @ $1.13 / piece.

RS_Jim

That's it! And he will soon be offering encoded gear motors at the fantastic price of $2.25 each + shipping.

erco

RS_Jim wrote: »

That's it! And he will soon be offering encoded gear motors at the fantastic price of $2.25 each + shipping.

Free amplifier with each order. Won't last!

RS_Jim

LOL

GordonMcComb

RS_Jim wrote: »

are they using - instead of a period $1.13 $1-13?

No, it means $1 is the unit price at the (high) quantity they may or may not quote in the listing, and $13 is the sample price.

As usual, for my application, I can't rely on direct-from-China sources. It changes too often and becomes obsolete before I can get the information into the hands of consumers.

RS_Jim

Gordon,
Thanks for the enlightenment.
Jim