Working with Delrin

[scheky]

I know that most people who work with Delrin (Acetal) do so with Rods that they bore out like wood.

Now, not having a lathe, and preferring Delrin to PvC, I was wondering if the Delrin Tubing (http://k-mac-plastics.net/acetal-delrin ... -tubes.htm) would be a decent basis for a whistle.

I know a CPvC high D would be likely a 0.60in ID, Likely the 0.50in or the 0.625 could be adjusted to work accordingly.

From the whistle makers out there, what's your opinion?

[raindog1970]

A 1/2" CPVC high D would have an I.D. of 0.469", which is an excellent bore size for that key.
1/2" schedule 40 PVC has an I.D. of 0.622", which is best suited for a Bb or low A whistle.
The acetal tubing you're looking at has a wall thickness of 0.125", which is really too thick.
If you're interested in an alternative to plastic, aluminum tubing is available in a nice variety of diameters and wall thickness... most whistle makers choose the 0.065" wall thickness variety.
Brass tubing is available in the widest variety of diameters and wall thickness, so you might want to consider it too.

[brewerpaul]

A 1/2" CPVC high D would have an I.D. of 0.469", which is an excellent bore size for that key.
1/2" schedule 40 PVC has an I.D. of 0.622", which is best suited for a Bb or low A whistle.
The acetal tubing you're looking at has a wall thickness of 0.125", which is really too thick.
.

I tried some of this, but with that I.D. the tubing would not fit onto my lathe arbor (0.5") so that I could turn the thick walls down to size. It would have required gundrilling, which is what I normally have to do anyway, so I've just stuck with rods. My gundrill makes a bore just the right size.
If you can mount the pre bored stuff on an arbor)make one yourself?), then it would be a good way to start--

[raindog1970]

I tried some of this, but with that I.D. the tubing would not fit onto my lathe arbor (0.5") so that I could turn the thick walls down to size.

I'll bet they allow a few thousandths of an inch of extra material so that the bore can be machined finished without making it larger than 0.5".
I've never tried any prefab acetal tubing, but acetal rod is always a few thousandths of an inch larger in diameter than specified to allow for machining a smooth finish without having to turn it down smaller than its specified O.D.
You can put a glossy smooth finish on acetal, but it's always a bit rough from the factory.

[waltsweet]

Scheky,

For sure, Delrin can give you a nice finish that you can't get with PVC.

My bore on the Pro HiD is .500". We also use this size for the little fifes; in contrast, the piccolo version has a bore of .453", with a significant difference in playing characteristics. That's about 10% difference in bores, so what I'm saying is that a change of 10% makes a BIG difference in how it plays.

If you're not set up to cut your own bores from Delrin rod, the standard tubing may give you a disappointing whistle.

Walt

[brewerpaul]

Scheky,

For sure, Delrin can give you a nice finish that you can't get with PVC.

I may be slow , but I JUST figgered out that you can get a better finish sanding Delrin by sanding it wet. I just used 400 and 600 grit wet/dry sandpaper with lots of water and got a MUCH better surface than I'd previously gotten using the stuff dry.

[OBrien]

I sand it wet, up to 1500 grit, then buff it with a Dremel. It comes out like glass. You have to use very little pressure with the Dremel buffer or it melts a little.

[jsluder]

Scheky,

For sure, Delrin can give you a nice finish that you can't get with PVC.

I may be slow , but I JUST figgered out that you can get a better finish sanding Delrin by sanding it wet. I just used 400 and 600 grit wet/dry sandpaper with lots of water and got a MUCH better surface than I'd previously gotten using the stuff dry.

But I like the matte finish on my black Delrin Busman. I don't think I'd want it any shinier.

[John F.]

O.K., Professionals--I'm confused...

I've been using off the shelf PVC 'plumber's pipe' to make flutes (schedule 40, the off-white stuff, 3/4"), and so far I've made one 'G' and one 'D' , and, as far as I'm able to play them, they sound o.k. (I'm a guitar player, remember--been playing woodwinds, oh, a whole week now ). I've since run out for a 1/2" length of the stuff, in order to try to make my own whistle.

Are we saying I won't get a good 'D' whistle out of it? If not, is there anything my Dremel and I can do to make it better?

..you know, if I can't make this work, I can open a pub out of my garage instead...maybe call it "The Hacksaw and Hammer" or more appropriately, "The Bloody Thumb":lol:

[scheky]

They are responding to me about Delrin tubing. This isn't the same as the pipe you are using, it has a much thicker wall thickness.

Different animal entirely.

[OBrien]

PVC makes a great whistle. Just don't inhale the dust.

[brewerpaul]

[quote="jsluderBut I like the matte finish on my black Delrin Busman. I don't think I'd want it any shinier. [/quote]

At 400 or 600 grit it's still matte, but I'm able to get out some of the concentric toolmarks that I wasn't able to previously. I've thought of getting it shinier, but I'm afraid it'll show every tiny scratch that way. The matte has a nice grip too.

[ctilbury]

Has anyone tried using ABS for a whistle? It is about half the cost and has many of the properties that make a good instrument. Plus, you can glue it.

[brewerpaul]

Has anyone tried using ABS for a whistle? It is about half the cost and has many of the properties that make a good instrument. Plus, you can glue it.

Very interesting. What will glue this stuff to metal? If anyone has any scrap I'd love to play with it a bit. Ditto for other potential polymers.

[EricWingler]

Has anyone tried using ABS for a whistle? It is about half the cost and has many of the properties that make a good instrument. Plus, you can glue it.

Isn't this what Susato whistles are made of?