Re: [CAD_CAM_EDM_DRO] Re: Agilent Encoder Pull-up resistor

afogassa wrote:

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>
>Hi Jon,
>I've not used Geckos drives so I can not coment on it.
>Rutex drives and support is tumbs up ! and works for me.
>Now, I don't know what drives you're using, but I would like to know
>the specs? such as encoder counts, motor rpm, and if is the only
>machine running or do you have welding machines, plasma cutters,
>VFDs, working at the same time as you're running your servos?.
>
>
>

I make (and sell) my own drives. My Bridgeport has 1000 cycle/rev Sumtak
encoders. I have limited the system to 120 IPM = 600 RPM on the leadscrews
for safety reasons. That is fast enough for my system.

On the Taig retrofits I do, with the 20 TPI screws, I do 90 IPM. 90 * 20 =
1800 RPM. With a 500 cycle/rev encoder there, that is 60,000 counts/second.
On the 150 Lb. mini-mills I do, with the 4:1 belt reduction, 16 TPI
screws and
same motor/encoder, 60 IPM is 60 * 16 * 4 * 2000 /60 = 128,000 encoder
counts/second. I had a setup which used a higher resolution encoder and was
running 350,000 encoder counts/sec with no problems.

I have a VFD on the mill, and it affects other equipment such as computer
monitors, but not the CNC control. I DO use shielded cable for the
encoders.

Jon