Ratchet Stop

To accomplish the patterns typically imparted onto metal with guilloché, the cutter needs to be moved a repeatable distance each time the movement is made. (Such movement is typically in the Y axis.)

A Ratchet Stop is used on the cross slide to accomplish this.

Rose engine homemade, tour a guillochér

This is a YouTube video from Frédéric Verschoore showing a ratchet stop at around 9:30 minutes into the video, so it is set to jump ahead to that.

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Disclaimer : eMail comments to me at OTBookOfKnowledge @ Gmail.com. The process of woodturning involves the use of tools, machinery and materials which could cause injury or be a health hazard unless proper precautions are taken, including the wearing of appropriate protective equipment.