Yasnac MX1 Drip feeding

[TD-4242]

I've recently picked up an old CNC machine for my garage shop. It was old, cheap and really well cared for so even though it's the infamous Acroloc so far it seems better than the reputation. After searching reading and experimenting I finally got drip feeding to work without the overrun issues I've been having the last several days. I think the final fix was disabling the FIFO buffers on the comm port.

Anyway now I have a 17k program that I can just barely fit in memory or I can drip feed it in Tape mode. From memory it runs smooth as butter, Drip feeding it acts like there's a few milisecond Dwell between every move. I've been trying to figure out what settings may cause this, but so far I can't find the right tuning parameters to make it smooth. Any ideas what I might look at?

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[machinehop5]

I've recently picked up an old CNC machine for my garage shop. It was old, cheap and really well cared for so even though it's the infamous Acroloc so far it seems better than the reputation. After searching reading and experimenting I finally got drip feeding to work without the overrun issues I've been having the last several days. I think the final fix was disabling the FIFO buffers on the comm port.

Anyway now I have a 17k program that I can just barely fit in memory or I can drip feed it in Tape mode. From memory it runs smooth as butter, Drip feeding it acts like there's a few milisecond Dwell between every move. I've been trying to figure out what settings may cause this, but so far I can't find the right tuning parameters to make it smooth. Any ideas what I might look at?

The Acroloc was a good machine for what it was designed/build for... Light milling, drilling, tapping with fast TC in early 80's. you will have fun it I am sure. Yasnac was basicilly a Fanuc control may help searching. Post some photo's if you can of Control and Board Numbers inside to help finding out more information about your machine. might get lucky find a Memory upgrade cheap.