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Important Update Regarding Sherline Products
October 20, 2026
We would like to share an encouraging development regarding the future of Sherline Products.
We are currently in discussions with an American manufacturer regarding the potential purchase of Sherline’s intellectual property and remaining inventory. The goal of this proposed acquisition is to preserve and revitalize the Sherline brand while providing continued availability of replacement parts, accessories, and machines for our valued customers.
As these discussions progress, we have agreed to temporarily suspend accepting new orders, effective October 19, 2026. This will allow us to preserve our remaining inventory while negotiations are underway.
Although no final agreement has been reached, we are hopeful that this opportunity will provide a positive path forward for the Sherline name and the customers who have trusted our products for more than five decades.
We sincerely appreciate your patience, understanding, and continued loyalty during this transition. We will share additional information as soon as it becomes available.
Our greatest hope is that the Sherline legacy of quality, precision, and American craftsmanship will continue for generations to come.

Karl Rohlin III and Charla Papp
Co-Owners, Sherline Products, Inc.
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Image shown is a representation only. Actual product may vary.

Parallel Port Signal Booster

SKU: 8763 Categories: , Tag:

Product Description

Purpose of the Signal Booster

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. That is why we use a 25-pin parallel port to transmit the information rather than a serial port like USB. 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*. 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. Also, the signal may decrease with the age of the computer or when it gets overheated. A symptom of this is that one or more stepper motors may suddenly change direction, run in only one direction or act erratically in other ways. 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. To help those with problems with parallel signal strength, Sherline has developed an amplifier to boost the signal strength. This is, in most cases, more economical than trying another computer.

*NOTE: Dell computers seem to have a lot of difficulties with the Linux OS installation.

Connecting the Signal Booster

The male side of the parallel connector is plugged into the printer port on the user’s computer. The parallel cable to the driver box is then plugged into the female side of the parallel amplifier. The USB cable is plugged into an open USB port on the host computer to power the amplifier.

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The improper use of machine tools and their accessories can result in serious injury. Before using this tool, thoroughly read the instructions and make sure you understand its proper and safe use.

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Always wear safety glasses when operating machine tools.

Download PDF 8763 Instructions

Instructions PDF Download