You mean aside from making over 80 telescoping blowpipes??snowkilts wrote:I'm delighted to find someone on this forum involved in the piping world! What did you do with the band?
Nothing. I was an aspiring piper, but, much to my chagrin, I learned I am not a musician. Love music, and have an extensive sound system, but I have great difficulty with my fingers. I tend to be dyslexic, which manifests itself when I type, too. It's not uncommon for me to type a three letter word in reverse. Needless to say, spell check and I are very good friends.
If I'm following you correctly, it should work, but I think I'd lose the idea of buying a reamer. You already must use a boring tool of sorts to prepare for the threads, so you might just as well use the same bar for the slight amount of oversize you require. Machining Delrin is very unlike metal, so you can use a 3/4" steel bar with HSS with excellent results. You can run the machine at top speed, using a fairly coarse pitch feed, so you can open up the pre-drilled hole in about the same amount of time that you'd spend reaming. It would provide the added benefit of correcting the bore, which, as I've already stated, will move about when you open the material. Do keep in mind the idea of roughing both the exterior and interior before you take any finish cuts, to avoid problems associated with excessive movement.I don't have a sketch, but what I'm trying to do is make a tenor drone stock with a brass tube inserted in it. I want the tube to be suspended in the delrin stock, not touching it, held in by threads at one end. I have some 7/8" brass tube, on one end of which I have soldered a piece of 1" brass tube about 1-1/4" long. I plan to cut threads on this, and screw them into mating threads on the delrin piece.
I recently spoke to a friend who is an instrument repair guy, and he says the way he does stuff like this is just use a drill for the initial hole through the delrin, then size it with a taper shank reamer held in the tailstock. I think I will give this a try with my spade drill and a 29/32" reamer. I will then need to bore out an inch or so of the delrin piece to the pre-thread diameter and tap it. How does this sound?
You would be far better served to spend the money you'd pay for a reamer in buying a solid carbide boring bar, for that matter. Then you'd have a bar that will be useful for other purposes, very unlike a reamer of the size in question.
I am a bit curious about your desire to isolate the drone from the stock. Do you expect to gain something in the way of better sound? Is the stock dampening the vibrations?