Re: [CAD_CAM_EDM_DRO] Encoder line count.....

doug98105 wrote:

> Are encoder line counts usually expressed in an abreviated form? For
> instance, I have an encoder with a line count of 2048 (a power of two
> thingie). Would this be referred to as a 2000 line encoder for ease
> of description.

No. Definitely not. First, let me describe one real confusion factor that
IS an industry problem. There is no ONE accepted way of describing
resolution. Most companies have a description that is some form of cycles/revolution.
Such a value would be multiplied by 4 to give the full number of quadrature counts
available. So, a 1000 cycle/rev encoder would give 4000 counts/rev to an
encoder counter that counts all transitions.

> Likewise when you say 1000 line encoder is that really one with 1024
> lines? Or does a 1000 line unit have exactly 1000 lines?

Yes, a 1000 line encoder would have EXACTLY 1000 lines, giving 4000 counts
in quadrature.

A 1024 line encoder would have a different part number, and would give 4096
counts in quadrature.

> I'm asking because I have a stand-alone programmable servo controller
> made for a rotary axis. They specify to use a 1000 line encoder. If
> they actually mean 1024 then I can use the 2048 line model and double
> my angular rotation when I program it. Doubling the programmed angle
> I can deal with, I don't want to have to deal with a ratio,
> 2048/1000, for angles, can't do that in my head.

If it specifies 1000 lines, that almost certainly means exactly 1000.

Jon