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SolidWorks has several ways to represent threads, including the hole wizard and cosmetic thread. However, if you need to create true threads, we need to do a swept cut and actually cut the threads. This can be time consuming and adds a complex feature to your model. As with all sweeps, we need a profile and a path. The profile is just a 60 degree triangle, and the path is a helix. Now for the hard part. We need to input the correct values into the helix in the profile sketch to get the correct thread when finished. Let's take a look. Over here in solid works I've got a bolt and the bolt is going to be a one inch, and sixteen thread.
The outside diameter or nominal diameter is one inch, and what I want to do is I want to create a little triangle to sweep and cut around the outside of that to create the sixteen thread. So let's take a look at the sketch first. So over here is the sketch three. I'm going to go ahead and open that up and take a look. And click on the Space bar so, I'm looking straight at it. I'm going to zoom in here. I can see I have a 60 degree triangle here and you can see I've got a distance here of 0.031. I've got a little radius here at the corner of 0.003, and you can see I have a value here of 0.955, which is the pitch diameter of that thread.
And you're saying, well where do these values come from? And the answer is, I look them up in the machinery handbook, or you could look it up online. So, I'm going to point you first off in the direction of where do we get these values from. So the book I'm going to be referencing is call the Machinery's Handbook and I'm using the 26th version in this course. However, there's newer versions available. In fact, you can go to the website. Industrial Press has been producing this book for over 100 years, and there's a bunch of different versions of the same book. There's a small one that fits in your toolbox, or you can get the larger, large print edition, or you can even get a CD-ROM version.
My suggestion is to get the CD-ROM version of the book, that way you can download it, put it on your computer or your flash drive. Anytime you need the values, you open the PDF document, look at the values, you can even print them out if you need to. That's a really handy way to not have to carry this huge book around with you any time you're working on a design. You can also buy it from amazon.com, notice they have the full book version here. If you scroll down a little bit you can also get the CD-ROM version. So either one is a great way to go. You can always look up the values depending on your preferences. Now looking at the threading profile in the machinery's handbook.
You can see we're going to be using this profile here to define our sketch inside of SolidWorks. So, all we really need is a triangle to define this. So, the value of the triangle's going to be this section here. We're going to have a pitch line here, which is actually one half the pitch. So the pitch of the thread you notice is going to be 1 in 16 so 16 threads per inch and we're going to divide that in 2 to get this length of this value here. And you could see we've got the basic pitch diameter here and those are the values that we're going to look up from the table now let's jump over to the table.
In this example, we're going to be using the one in sixteen thread. We're going to be using the two way external thread. And, you can see from the table, we're going to be looking, first up the major diameter of the thread. That's going to be the outside section, that we're going to model in SolidWorks. In this case, here, there's both a max and min diameter. We're going to take the average of the two values. So, in this case I see I have a 0.9985 on the max and a 0.9891 on the minimum. If I take the two of those and I average them together I get a 0.9938. If I jump over to the pitch diameter column you can see my pitch diameter is 0.9579 on the max and 0.9529 on the min.
Again, let's average those together and get a 0.9554 value. We're going to be using those values as our input values inside of Solidworks. Now that we have these values, I want to also point out how they're used. The thread pitch in this case is a 1 inch, 16, or a 1 inch with 16 threads per inch. So therefore, the thread pitch is equal to 1 divided by TPI or one divided by 16 that's 0.0625. So pitch divided by 2 is 0.0625 divided by 2, which is at 0.03125. That's the value here.
0.5 pitch, we're going to be importing for, and the basic pitch diameter here is the value we looked up from the table. Let's go back to SolidWorks and put those values in. Okay, you can see here, which is that pitch line here. If I open it up, you can see it's the 0.03125 value. And if I come over here, I can see this value here, which is the pitch diameter, which is 0.9554, and that's the value that we got from the table. Now, before we move on, I want to point out how we actually draw this triangle here.
So I'm going to move these couple of values in. Move this stuff so we can see it a little easier to make sure we are doing exactly the same thing. Okay? I'm going to draw out here the same type of triangle. So first things first, I'm going to draw line. I'm going to start with a vertical line and then I'm going to draw out a triangle. Then I'll be perfect in fact it can be a little bit in the beginning, no big deal. Grab these center line tool. From the point of that we are going to draw a line to the mid-point of the vertical one. Then all I have to do is click on the line and say make horizontal to get an equilateral triangle.
Now I know it's going to be sixty degrees. So click on the first line. I'd say the other outside line and type in sixty degrees. And then what I need is this pitch line. So I'm going to go ahead and create a line between the two outside edges of the triangle. Notice, I don't want to snap to the midpoint on either sides. So I wantna make sure I'm going to be far away from the midpoint. Just create a line from the top, all the way down here to the bottom and make sure it's a vertical line. Make sure you've got that relationship here, showing it's a vertical. Then I should be able to drag this line back and forth along that triangle and verify it's not snapped to anyone of those midpoint lines.
Once you have that line, we need to determine the length of the line. So go ahead and click on Smart Dimension, click on the line itself, and let's go ahead and type in the value. Now remember, our pitch is 1 divided by 16 for 16 threads per inch, so I do that value here, I can say 1 divided by 16, then again, divide that by 2. If I do all that, click, OK. It should give me that 0.03125. What I did there, was I actually used the input bar as a calculator. If we open it up again, it's very simple to do. You just type in 0.0625, divided by 2.
And as soon as you click anywhere else, it puts that value. And does the math for you. So it's really handy way to use the input project should do some math for you. Once we have this here we can grab this triangle, and drag it over here. We can resize it, put it where we need it. And what I normally do is connect it here to the end of the park as well as to the outside diameter of that threaded section to make sure we have it aligned in the perfect location. And then what we need to do also, is connect it to the pitch diameter. So, I'd come up here, to the diameter.
I'd go from the center line to one of these corners on the end point, type in the value, and notice it's a double diameter, so if I come here, it's only a single diameter. As soon as I move past the center line, notice the value doubles. So, if I click here, then I can type in that 0.9554. Click, OK, and that moves that new triangle right to where we need it. I can drag it up here for a second just to show the value is locked in. Now I still needed to find where the back of this thing is, and where it is up and down.
However, we can see this line here is fully defined in black because it knows what diameter we're using in this example. It takes a bit of work to create a real cut thread. So, I would not recommend this option in all situations. However, if you're going to rapid prototype your parts, and want threads included, or if you want them to visually look correct, then this is the option to choose.
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