TWCalc Manual

[Daniel_Bingamon]

Some time ago, I wrote a program called, "TWCalc" - A program for calculating tonehole positions for tinwhistles.

After many requests, I have written a manual for using it.

The manual is at: http://www.tinwhistles.us/twmanual.htm

TWCalc can be downloaded at: http://www.tinwhistles.us/twcalc.htm

[brewerpaul]

Most excellent my friend! I intend to print myself a copy and tinker around with this one. Just for curiosity, I'll plug in the figures for my own whistles and see how they compare to your results!

[Chiffed]

Thanks, Daniel!!! Very clear.

Is there any way I can better predict actual cork-to-end lengths? On one-piece flutes this is the dimension that ends up biting me.

[Daniel_Bingamon]

Let's say you make a high-D whistle and it plays in tune. Then you decide to make a Low-E with the same style fipple and tubing diameter. From the known whistles actual cork-to-end length vs the calculated-cork-to-end length you can arrive with a length correction by subtracting the two.

Then when you make the Low-E whistle, simply add the correction result to this whistles calculate-cork-to-end length to get the true length.
This also works on flutes.

BTW - The Cork to end length in TWCalc is more suited to tinwhistles, on flutes this will throw you off.

[Chiffed]

Thanks!
I just used the Cork To End (and other calcs) to make a new mezzo A tube for a Meg head. It was an experiment to see if I could 'get it right' on paper before any cutting or drilling. It worked beautifully. A bit of deburring and some undercutting to tweak the second octave, and the whistle is in tune with enough wiggle-room on the head to tune 15 cents sharp or 30 cents flat.

This time I even paid attention to the cutoff freqs, so volume and tone are pretty even. Couldn't have done it without TWCalc (OK, I could have broken out the old acoustics text and spent far too long with a scratch pad and calculator, made a bunch of errors and had to start over anyway).

If I ever sell a whistle, I owe you some dough.

[Tommy]

The TWCalc would not open. It said 404 not found?

[Guest]

woowoo!

[n4vgm]

It would not open for as well, although the manual page did. Otherwise, an awesome site with great products. I bookmarked it for future WHOA.

Bob Z.

[Daniel_Bingamon]

The TWCalc program is a windows program and it is zipped. You have to unzip it first.

[espressotime]

I concur, the url for the program doesn't seem to work so I can't download it, I get a ...

404 Not Found

The requested URL was not found on this server.
Jubilee Music Instrument Co.

... as well. Sounds like a great program, I'll start reading the manual first.

[Chiffed]

Well worth waiting for the server to be sorted out (didn't work from here either; just thought I'd try).

[Tommy]

The TWCalc program is a windows program and it is zipped. You have to unzip it first.

I give up. Where is the zipper.

[Daniel_Bingamon]

Here are some unzip programs: http://www.google.com/search?hl=en&q=winzip

[Oreo]

Hi,

Thanks so much for your program. I use Avast antivirus software, and it looks like that may be the problem. But here is the error message I receive each time I run TWCalc:

C:\Program Fieldsälwil Softwareävast4äSwMonVd.dll. An installable Virtual Device Driver faill Dll initialization. Choose 'Close' to terminate the application.

Close Ignore

To run the program, I have to choose Ignore.
Any ideas?

Thanks. Your program has helped me to produce in-tune whistles.

Phil

[Daniel_Bingamon]

The link is repaired.