OK I will chime in.
First let me say there are a few ways of doing any type of segmenting and this design is no exception. The traditional way which Mark showed you using small cut staves is the normal way. I may try doing something like this in the future for another project I want to work on. The problem is you need to make a sled that is safe to use and accurate.
My method is safe and accurate and can be used for other designs and that is why I built a router sled for my wood lathe. This design and most segmented designs for pens are taken from pool cues. That is where you can get alot of inspiration from. Now if you had a cnc machine that would make this and other designs very easy.
Being I do make pens I wanted to do some segmenting and the ones I saw were basically cut pieces off some straight, some on an angle and glue back together. Then I seen on the IAP site Brian and Mark Gisi pens and they do all kinds of neet segmented work with very tiny pieces. You can google them and see some of their work. I do not want to get that elaborate and wanted something easy to make but look cool.
I had read some time ago about a jig for a router to be used on a lathe for fluting by John Lucas. So I googled him and used his basic design to make my own router sled design so that I can do various patterns in small objects such as pens. Here is the pdf file I used to make my sled.
A jig for using the router on the lathe By John Lucas[IMG]linkscanner://safe.gif/[/IMG]
Here is my design that I am using which is similar to John's but without all the adjustabilities because I feel there is no need in pen making.
Now the other critical part is an indexing wheel. I can look for the link of the one I use if someone wants me to or else you can google for indexing wheels. This gives you the accuracy for spacing around the pen blank.
I showed you a photo of the pieces used. Yes I make one long blank and cut the smaller pieces from that. The solid pieces are just that. It is necessary to drill accurately in the center of this blank for the tubes and I accomplish that with the use of a collet chuck to hold the blank.
On these segmented pens I used a 1/8" router bit to make slots in the holly blank and filled those slots with 1/8" gabon blackwood. When done I spun down and drilled. I cu the blank in half and used one half for the cap and one for the barrel and drilled according to instructions. When I glued up the final blank before spinning to shape I cut all appropriate pieces and epoxied to the tube. The spun to desired shape and finished as mentioned in that posting.
Now those are the basics to making this pen and yes there are alot of details left out because It would take so long to explain them. But if anyone does make the jig and does get to that point I will go more into it.
I will give you a few clues if you are making the jig. You need to dedicate a router for this andbuild a holder just for it. I suggest leaving it attached so no need to readjust at a later date. That is what I did. The next tip is for building the sled. The router must slide on the sled with the router bit dead center to the lathe you are using. In my case a Jet mini. The hight of the sled can be fixed as I did or you can make it adjustable so it can be used on other lathes. But the height of the sled will be determined by the size of the router used.
Hope some of this helps. Good luck.