Incorrect Encoder/Gear Ratio

Help & Support Robot Parts
1

Hello,

I am looking to purchase a few 28PG-385SP-19-EN units, but I need to know how precise the encoder is?

The listing stated this encoder was 64 pulses per motor shaft, resulting in 4480 pulses per rotation of the gear box shaft. But the gear box is 19/1, not 70/1. Does anybody know the actual numbers?

The data sheet on the listing states the gear ratio is 19/1 and ES motors doesn’t offer an 70/1 gear ratio motor on their site.
http://www.e-smotor.com/products/DC_planetary_gear_motor/2018/0331/21.html

Or is there some other multiplication factor of 70/19 that I am not considering?

I emailed Robotshop’s sale’s team about the listing, but they just told me to put a post here instead…

3

Hello @Tns5614 and welcome to the forum!

It does seem like an error in the description but as it is a quadrature encoder and the multiplication factor between 70 and 19 is close to 4 the second value could be related to the states per turn (as a quadrature encoder gives 4 states per pulse). However, this is only a theory, and as this is a RobotShop Marketplace product I recommend asking the manufacturer directly.

1 Like