Motor number 28819 question

w4fej

I was wondering if you have a PDF for the face motor number 28819 ?? (The offset shaft end) I see the side view drawing but I need to know the locations and dimensions of the mounting holes and the distance between the mounting holes. If you don't have a drawing, a hand drawn note with the measurements would be good enough. (inches please). I'm just trying to determine if the adapter I have will fit that motor.

I have an application using a gear motor that as far as I can tell is the same motor minus the encoder and shaft extending out the back of the motor. I also have an adapter the brings the output shaft back to the center line for mounting the whole assembly inside a 2" tube thus driving a shaft in the center line of the tube.. Having the encoder attached to the motor would be a HUGE mechanical improvement to my project..

Thanks for your time...

Mike B.

P.S. Perhaps the encoder is available and I could adapt it to my current motor ??

Publison

If this kit uses the same motors, there are dimensions for the bracket.

http://www.parallax.com/downloads/motor-bracket-and-wheel-kit-product-guide

w4fej

Yep it's the same motor alright but the drawing doesn't show the distance between the mounting holes for the motor itself, only the mounting bracket. I'm just trying to determine if my adapter will mount to the Parallax motor... If the encoder is available as a separate item I could easily adapt it to my motor.

Mike B.

Chris Savage

The encoder is part of the motor. At least in the sense that the PCB is soldered to the motor terminals and the encoder disc is attached to the motor shaft in a semi-permanent fashion. As for the mounting holes I did not realize we didn't have the mounting hole positions. They match the Stingray motor mounting holes so I will see if we still have that information.

Duane Degn

I recall Kye saying these encoder from Lynxmotion will fix the Parallax motors (the older ones without encoders). They're kind of expensive but they look like they have a higher resolution than most encoders.

Dagu makes some lower res encoders. They don't cost as much as the Lynxmotion version.

w4fej

Chris Savage wrote: »

He encoder is part of the motor. At least in the sense that the PCB is soldered to the motor terminals and the encoder disc is attached to the motor shaft in a semi-permanent fashion. As for the mounting holes I did not realize we didn't have the mounting hole positions. They match the Stingray motor mounting holes so I will see if we still have that information.

Ok Chris and thanks for the reply..

My limited experience with these motors tend to lead me to the conclusion that there may be a sort of standard on the mechanical stuff like the mounting holes etc.. I just might order the motor anyway and see if I can kluge it together for my project.

FYI I am building another ham radio mobile antenna (my 3rd) that uses a geared motor like 28819 to turn a piece of all thread that drives a large coil up and down inside a 2" tube for tuning. Having the encoder on the back of the motor GREATLY simplify' s the installation.

Mike B.

w4fej

Hey Chris.

Can you tell me the distance BETWEEN any two of the three 120 degree based holes?? I measured mine and as far as I can tell with my calipers that distance is .900". Or maybe the circle diameter for those three holes. Just trying to tell if my adapter will bolt to your motor....

Mike B.

Chris Savage

Hello,

Sorry I was out last week on a family emergency. Here are two links that I hope can provide the information you need. These new motors are GM37-555-30.

http://www.ttmotor.com/Upload/2014-7-7/201477164341_19_GM37-555.pdf

http://www.ttmotor.com/Product.asp?ID=727