Spherical Slide
Just getting started?
You can delay getting one of these. Frankly, unless you have the need for one, you could make a load of stuff never having one of these. But, they can be used to make some really cool stuff!

A Spherical Slide is used to make a controlled, curved surface. It is a modified Cross Slide, and is very different from a Curvilinear Slide / Apparatus.

With a spherical slide, the cutting frame (or drilling frame) is rotated around a vertical "line" which is parallel to the Y axis.

Fundamentally, a spherical slide works the same way a sphere-cutting jig does. (The picture to the left shows the Perfect Sphere from Carter Products.)

Conversely, on a curvilinear slide, the cutting frame (or drilling frame) is moved in an out (in the direction of the X axis) whilst moving along the Z axis.

The spherical slide rest shown in the pictures below was designed by Al Collins (the "A" in the MADE Ornamental Rose Engine), and it shows a very fine example of one for a rose engine lathe.

You can click on any of the 3 pictures to see a bigger version.


Pictures courtesy Al Collins

This video was given by Peter Gerstel at the 2018 Ornamental Turners International Symposium. It shows his approach which was used to make a dome shape to the end of an object.

This video was given by Jon Magill at the 2018 Ornamental Turners International Symposium. It shows his approach to making organic curves with ornamental turning. But, what is most intriguing about his approach is the overlay used to allow the ornamental turner to see what the cut will be.


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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.