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Pc with parallel port cnc4/2/2024 ![]() ![]() ![]() This is in most cases more economical than trying another computer. In order to help out those having problems with parallel signal strength, Sherline has developed an amplifier to boost the signal strength. This has not been a problem with any computers sold by Sherline-only when connecting the Sherline driver box to a computer with a parallel port of unknown quality. A symptom that occurs when this happens is that one or more stepper motors may suddenly change direction, run in only one direction or act erratically in other ways. Also, the signal may decrease with the age of the computer or when it gets overheated. Signal output through the parallel port on computers should be about 3 volts, but some poorly made cards and connectors may put out only a marginal signal. However, it has recently come to our attention that some users of our 8760 driver box are having problems when using them with their own computer. That is why we use a 25-pin parallel port to transmit the information rather than a serial port like USB. In mucking around this and other forums, it appears that perhaps there are, or can be, timing problems with that setup due to the PC operating system which may, or may not, be busy with other. In order to get sufficiently fast and glitch-free throughput to run all four axes of a CNC system at the same time, multiple wires are needed. So my cnc kit came with a 24 volt power supply, break out board and a parallel port cable to attach my breakout board to my PCs parallel printer port. ![]()
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