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SuperTiller build along

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SuperTiller build along

Postby jwillis » Sat Nov 15, 2008 9:22 am

I will attempt to show you in layman's terms how to use SuperTiller. I am not an engineer, so I can't interpret or explain everything in the program. I am still learning many of the basics. If you have technical questions, contact Alan Case who wrote the program. His contact info is listed in the Supertiller instructions pdf.

First, download the program from here:
http://blackdragonarchery.angelfire.com/ (the program)

This is the only place to download the program that I can find today that actually works. There are actually three versions of the program that I know of. They work in different versions of Windows and Excel. These are the names:
SuperTillerV6R01a.xls
SuperTiller6_6.xls
SuperTiller6.2.xls
Instructions PDF

If you want to try it out, just send me a PM with your email address and I'll send you all of the programs. As soon as I get my new blog running, I'll host the programs there.

SuperTiller is a spreadsheet that runs in Microsoft Excel. It has macros to do the calculations. These macros will only run on a PC and don't work on a Mac.
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Re: SuperTiller build along

Postby jwillis » Sat Nov 15, 2008 9:39 am

First, download the instructions pdf and read it. Follow the instructions in the pdf to get Supertiller running on your PC. This part of the instructions are very clear. It gets unclear when you try to design your bow, so that is where I will begin.

Once you get it running you are ready to follow this build along.

On this build along I will create my 2" deflex/4" reflex hybrid limb design in Supertiller. First I must draw the side profile of my limb and plot the x and y coordinates so I can plug these into Supertiller. Since I already have this profile in Adobe Illustrator, I simply made a new file with the limb profile and drew a grid over it having 1" squares. Then I put a dot on the limb every two inches and wrote down the coordinates of these dots. Then I printed this out on paper so I could plug the coordinates into Supertiller.

I made the red line the "0" line of the y-axis. I made it this way to match the way I measure deflex (from the deepest point of the limb to the riser back) and reflex (from the deepest point of the limb back to the nocks or limb tip). You could also put the "0" at the riser back and I have done it that way before. Notice on this drawing that this bow actually has 1.6" deflex and 3.4" reflex (to the string nock) even though I call it 2" deflex/4" reflex.

Here is my limb plot that I printed out.
Image
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Re: SuperTiller build along

Postby Hank » Sat Nov 15, 2008 9:56 am

These macros will only run on a PC and don't work on a Mac.


So Windows sees the potential in Recurve and Longbow Archery and MAC doesn't?

hmmmmm interesting :)
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Re: SuperTiller build along

Postby Gino Bruno » Sat Nov 15, 2008 10:20 am

NICE!!!!!!! i will be paying real close attention to this one, jim!

btw, i put this up top as a "sticky" and we will keep it there till it is done. before you get too far into this, would you like to have a separate thread for questions and answers so that this thread flows really smooth and is easy to follow or do you want guys to just post questions here?
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Re: SuperTiller build along

Postby jwillis » Sat Nov 15, 2008 10:28 am

This is the first "sheet" or view you will see once inside Supertiller. First of all, print out your instructions pdf and hold it in your hand while plugging in the "Design Parameters" of your bow. Once you enter some basics here, they won't change much.

Image

You can see that I selected 16 segments. Supertiller breaks the limb down into these segments to do the calculations. Use the pull down arrows to make your selections for # segments, material, string type, then put in the number of strands. ST will auto generate the values shown in blue. I plugged in 16 segments, glass, infinite strength string, and 10 strands.

Image
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Re: SuperTiller build along

Postby jwillis » Sat Nov 15, 2008 10:38 am

Gino Bruno wrote:NICE!!!!!!! i will be paying real close attention to this one, jim!

btw, i put this up top as a "sticky" and we will keep it there till it is done. before you get too far into this, would you like to have a separate thread for questions and answers so that this thread flows really smooth and is easy to follow or do you want guys to just post questions here?

That will be good. Thx Gino. It may take me a few sessions to get this done just because of the graphics. Jim
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Re: SuperTiller build along

Postby BullMtnArchery » Sat Nov 15, 2008 11:05 am

Gino Bruno wrote:NICE!!!!!!!
btw, i put this up top as a "sticky" and we will keep it there till it is done.


Jim this is great. Thanks for doing this. Ilike the longbow you posted not to long ago that you used this program to design.

Gino, what do you mean by up top as a sticky, in the build alongs?

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Re: SuperTiller build along

Postby jwillis » Sat Nov 15, 2008 11:18 am

Next, I like to enter the bow profile. I enter the "X(in)" coordinates from the printout that I made of my limb. Notice that the chart already has the "Y(in)" coordinates listed as 0.00, 2.00, 4.00, etc. This was auto generated when I selected 16 segments. Start with the bow center coordinate at the top...(1.60, 0.00) and enter each coordinate from the limb prinout. This is one of the confusing parts of the program. Always enter your profile here at "Modified Profile." ST will auto update the "Seg(in)", "Li(in)", and "I(in^4)" values. Once the coordinates are entered, push the "Update" button located just above to lock these in.

Image

This is where it gets tricky. Supertiller will auto generate a pyramid width taper with an equal thickness limb. Since we want a straight taper, lets enter the width values here in "Design Operations". I chose the "Start Point" of 4, which is Y-coordinant 4, or about 8" from bow center, and an "End Point" of 16, which is for the 32" tip of the limb, to start the calculations for the width taper and thickness taper. I'm actually using an 18" riser which would be a starting point of 9" but this is good enough for what I'm trying to test. I plugged in a "Thickness" of 0.31. THIS IS NOT THICKNESS--THIS IS THE WIDTH AT THE TIPS. It took me awhile to figure this out. I plugged in a "Width" of 1.39 which is automatically rounded up from 1-3/8" wide at the fades. Then pushed the button "Taper Width". I left all of the offset, stress, and scale factor stuff alone, setting them to zero or whatever. Scale Factor has to be 1.00 which means 100%--don't make the limb larger or smaller. Another tricky thing here is that "Max thick" and "Taper" really won't matter here if I want Supertiller to autogenerate the pyramid width taper (which I do because it is difficult to calculate and manually type in). Supertiller has a feature built in where it will auto adjust the limb width taper to keep the bow from breaking. I don't want it to do that in this test, so I'm going to let it auto generate the pyramid width taper, then I'm going to manually change the thickness taper. Get it? I'll show this later.

Image
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Re: SuperTiller build along

Postby jwillis » Sat Nov 15, 2008 11:35 am

After I pushed the "Taper Width" button, this is what Supertiller did. Notice that the numbers indicate there is a pyramid width taper and an equal thickness of 0.31 (large red box). I manually changed the 1.39 at segment 2 and 4 to 1.13 for the handle to be 1-1/8" wide (small red box).

Image

At the bottom of the Excel window, now I selected the tab for "Limb Section" sheet, which shows the back profile. Looks good, eh? :)

Image
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Re: SuperTiller build along

Postby jwillis » Sat Nov 15, 2008 11:37 am

Next, I'm going to manually set the thickness settings to a .002 taper starting with a max thickness of .345. I could have calculated these in my head or done it on a piece of paper, but instead I created a separate spreadsheet with several taper options that looks like this...

Image

Now, I just copied the 002 column into the Supertiller Modify Profile like this...

Image

Then, I pushed the "Update" button above, typed in the Brace height, max draw, and Draw Increment, then pushed the "Draw" button above that to run the program and generate the report sheet.

Here is the Report sheet for the .002 taper. Since I'm going to do another taper test and want to compare it to this one, I'll push the "Copy Run" button (red circle) so Supertiller will remember this data for the next run.

Image

Now compare the limb profiles in Supertiller to these actual photos of the .002 taper bow. Pretty close, huh?
Image
Image
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