Re: [CAD_CAM_EDM_DRO] Re: mounting encoder with pulley

Hi Lance,

You're saying that the pulse multiplier in the G340 both multiplies the
pulses from the CPU, AND divides the pulses coming in from the encoder?
I guess I missed that. I was under the impression that the little
board was only slightly different from the one in the G210, called a
G901. The notes for the G901 don't mention any divider for the encoder.

My servos are 300W Sanyo Denki "Super R". I haven't found any
additional information on them, other then what's on the nameplate.
Maybe I don't need any pulley reduction on them, they probably have
considerable torque!

I was planning on trying them out on the original leadscrews (20 TPI?)
on my RF-31 mill (ugh!), before I can get ballscrews. Probably means I
need a LOT of steps!

8000 * 20 is 160,000 counts per inch.
60 IPM would need 160K steps/sec.

Sounds like a Gecko G340 could handle that, but there were some comments
about positioning errors at high pulse rates (over 250K?). And I don't
think my old computers are up to that! If I do any belt reduction, I'm out.

Yeah, I want to play with some G340s!

Alan KM6VV


Lance Hopper wrote:

>
> Hello,
> That is what the step multiplier does. Assuming it is the same
> device that's been added to the G320 to make a G340. It sounds
> illogical, but it actually is a divider. In 4x mode, your 2000 ppr
> encoder will be 500 ppr. Or you can look at it as it now moves four
> pulses for every single pulse from the pulse source. I own two G340's
> (multiplier built in), and some small Yaskawa Minertia servos with
> 2000 count encoders (8000 quad). I ran them on the bench with
> different multipliers with success. Marriss just made the multiplier
> available so that G320 owners could add the capability later I guess.
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Alan Marconett <KM6VV@a...>
> wrote:
>
>>Hi Dave,
>>
>>Mariss' step multiplier is a little board that is added to a step or
>>servo Gecko (different boards). Makes a G201 into a G210, for example.
>
>>Haven't seen a public schematic.
>>
>>What I'd like to see is a schematic for a "pulse divider", that I could
>>connect to my 2000 line encoders, and get the equivalent of a 500 line
>>encoder's output. Should be do able.
>>
>>Alan KM6VV