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I found this video on you tube, my wife took possibly 5 years ago and sorry not Hollywood but hopefully shows the invaluable use
of my Constant Surface Speed attachment.



I fitted to a real Bull Lathe with gear reduction, and advised it can be also compatible for the Sieg type mini lathes.
Just need to be careful with the Sieg that the spindle does not start turning on its own.
This possibility is detailed in the instructions in the Digital hobbyist files created by C Levinski
The lathe since has gone through several more digital age changes, including the RELS, compound slide removed etc.
Hope of interest.
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John

Just a comment about the CSS that John is referring to here. There are much more sophisticated ways to implement a CSS than what John and I did here, but he wanted a very simple to assemble and? retrofit system at the time. (John's electronic skills have improved significantly since then!) Basically, in this system, a linear potentiometer with upper and lower limit pots replaces the lathe's speed control. An analysis of the values used showed that the RPM was accurate to 5% for most of the travel, especially at the extremes, as shown in John's video. The speed theoretically should go to infinity at the center of the work, so obviously the error increases as one gets near the centerline. The CSS is most valuable for facing larger diameter parts, as John has demonstrated in his video.

Also, please note that the issue of the spindle being able to start when power is applied is an issue with Sieg AND Real Bull lathes. Please check the instructions for warnings on this issue and use caution when operating!
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Regards,

Charlie
New Jersey, USA

SATTINGER’S LAW: It works better if you plug it in.
EDWARD'S LAW: It works even better if you turn it on.