Tips for making some sort of plan.

Hi Everyone,I’m new to LinuxCNC but have prior experience with Mach3. I’ve set up a lathe using a cheap Chinese breakout board (BOB), and while everything works, I’m facing an issue with the rotary encoder.As the spindle speed increases, the encoder’s position stops updating at higher speeds. I’ve checked this using the HAL meter, and it shows no response beyond a certain speed. However, when the spindle slows down, the encoder starts responding again.I’ve ruled out magnetic interference from the VFD because the same behavior occurs when I spin the encoder using an electric hand drill.Could this be due to:1. The encoder type (I believe it’s incremental)?2. A limitation of the breakout board (even though I’ve seen others successfully use the same board for threading, e.g., on the “GWBM” YouTube channel)?I’d really appreciate any insights or advice on troubleshooting this issue.Thank you!

Common issue I would say.

• Some of the BOB have slow (budged) Optocouplers, (you could check datasheets) 
• the parallel port is not particular fast
• linux cnc servo thread can limit speed if set high
• Encoders usually also have a speed limit, (becomes an issue for high speed spindles)

Some people try to use an encoder with less counts which works to some extend.
My system was hopeless; even with a 100 ppr encoder @600rpm.
Loosing the ocasional signal gave me a lot of trouble.  
After I spent the money on one of the typical FPGA cards, the issue disappeared entirely.

Greetings Timo