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Help. Please apply your creativity to my problem.
As I create more segmented projects, I like the look of thin segment rings. To me, thick segments look blocky many times.
The segmented woodturning books recommend milling wood stock to thickness. This seems to be a huge waste of wood. Alternatively, some recommend removing excess thickness while mounted on the lathe - again, a huge waste of wood. Some go so far as to splitting a segment ring with a parting tool. While this does not waste so much wood, when a segment ring is parted off, there is some excitement while the newly parted ring spins freely on the lathe and frequently breaks.
Some woodturners saw segment rings on a bandsaw. With good jigs and fixtures and a finely tuned bandsaw and a very good blade, this can work for smaller diameter rings. For larger rings, the exposed saw in the middle of the ring is a very scary safety risk.
Can I use a table saw? Often table saw jigs use the miter slots. However, this limits how to adjust segment ring thickness.
So, I made a box tall enough to support the biggest segment ring I can turn on my lathe. To resist tipping, the box is about 8 inches wide. 20 inches long seems to accommodate large segment rings through the saw blade.
A series of 3/8 inch holes allow a bolt for clamping. Originally, I wanted the lowest bolt to be higher than the maximum saw blade height. This did not work for smaller segment rings.
A large segment ring is secured with a bolt through one of the hole through the center of the segment ring and a cross piece of solid hardwood. Knobs on both ends of the bolt enable secure clamping.
Smaller segment rings cannot clamp the same way due to the possibility of the saw blade hitting the bolt. Instead, I used a different clamp cross piece. This clamping wood has a cross piece to distribute clamp pressure to the full diameter of the segment ring. The clamping bolt is above the segment ring and below a spacer block. Cinching up the bolt clamps the smaller segment ring.
In use, I first make sure the saw blade is as high as possible accounting for how many passes it may take to cut the ring and that the bolt placement will not interfere with the saw blade.
I then position the box against the rip fence and adjust for my target segment ring width.
Then clamp the segment ring in place. Slowly make the first cut, then rotate the segment ring for the next pass. In later passes, clamping pressure may tend to squeeze the saw kerf excessively. A thin slice of wood sized to the saw kerf is my "kerf keeper"
Final cleanup is similar to any other segment ring construction.
Since Covid-19 prevents me from collaborating with other local woodturners, I will appreciate your feedback and suggestions.
Enjoy!
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