Fasteners Features and Shapes

Fasteners Features and Shapes
Mechanical Objects & Features Tips & Tricks 46
Users often overlook some important options when
using the fasteners, features, and structural shapes that
can be automatically generated by KeyCreator.
I’ve illustrated a typical cap screw, pocket, and channel
to the right. Let’s take a look at some options that you
should be aware of when using these handy items.
We’ll be working with some typical examples that you
can create from scratch. They are also available for
download in file “ObjectsAndFeaturesTipsTricks46.”
If you have downloaded the file, click on the TOGGLE SPLITTER Icon
Turn off levels 3 and 4 in the display. This will leave just the screw visible.
If you haven’t downloaded the file, you can create a screw
just like this one by clicking on the FASTENERS Icon.
Then, click on the SOCKET Icon.
Click on the Fast Setup
Tab. Make sure there is
a check on the Create as
a Fastener Object
Option.
This particular screw is a
0.500-13 1.75 long.
Almost any screw will
do. Just make sure to
check the Solid Option.
To see the threads also
check the detail option.
Now, click again on the SOCKET Icon. Click on the
Fast Setup Tab. Remove the check on the Create as a
Fastener Object Option.
Click on the OK Button and place a second
screw to the right of the first screw. (To get the
orientation you need a CPlane set to 1.)
Your screen should now look like this:
Let’s assume that you wanted to use this screw
to make a custom fastener.
Click on the EXTRUDE FACE Icon.
A Dialog Box appears. Type 0.25 for the
Length and hit the ENTER Key.
If you try to select the top face of the
left screw you get the following
message.
If you select the top face of the right screw, the face bumps
up without a problem.
Switch to the Front View. (View 2.)
For the next operations you want your construction plane set to
the Drawing View, so Click on the CP=DV to remove the
Cplane from the top, right corner of your viewport.
Click on the CREATE HORIZONTAL LINE Icon.
Using the Cursor Option, place a line on the
screen that crosses the smooth section of the
shank on the screws. (You could use the
AlongE Function to accurately place the line
on the screw at a given distance. We don’t
have to sell this sucker, so that’s not necessary
for this exercise!)
Now, click on the TRIM FIRST Icon.
Click on the bottom portion of the left screw and
the following error message appears.
Click on the bottom portion of the right screw and then on the
line, and you chop the top off of the screw!
So you’ll want to remember that if you plan on modifying a
fastener made in KeyCreator, you want to create it without the
check on the Create as a Fastener Object in the Setup Tab.
If you have already created a fastener with the Create as a Fastener Object Option
checked, you can still get around the “protection.”
Let’s do this with the left screw.
Click on the GENERIC BURST Icon.
Then, click ONCE on the left screw.
Now try the operations that didn’t work before and you’ll see that they now function!
You can take a moment to delete the second screw that you created.
Then, click on the TOGGLE SPLITTER Icon. Remove level 2 (The screw)
from the display and turn on level 3. (The block with the slot.)
Switch to the Isometric View.
Your screen should look like this: Now this block
was created with “Create as a Feature Object”
checked. If you need to make your own, start with
a primitive block and create a slot using the
TOOLS/FEATURES/POCKET/SLOT Tool.
Click on the DYNAMIC FACE Icon
Select the left curved wall of the pocket and hit the
ENTER Key.
If you drag the blue vector on the
DynaHandle, you can change the slot
length. (The new Dynamic Functions override the protection on the slot geometry.)
Exit the function without accepting the
change. Then, switch to the top view.
(View 1.)
Click on the XFORM BOX-MOVE Icon.
Drag a selection box around the left half of the slot and block.
Select the XYZ Option
Type –1 for the X value and hit the
ENTER Key three times.
Notice that the block stretches but
the slot does not.
Now, click on the GENERIC BURST Icon.
Then, move the cursor over the slot and click ONCE on it while it is
highlighted.
You’ll find that you can now use the XFORM BOXMOVE Function to stretch the slot.
When you are done, click on the TOGGLE SPLITTER
Icon and remove level 3 (The slotted block.) from the
display and turn on level 4. (The channel.)
Switch to the Isometric View. (View 7.)
Your screen should look like this:
If you need to make your own channel, click on the
TOOLS/STRUCTURAL/CHANNEL Icon
This channel was also created with “protection”
on it. So if you try to use an EXTRUDE FACE
Operation on it or trim it in an orthogonal view
with a line that crosses it, you’ll get nowhere.
The XFORM BOX-MOVE Function will also
fail.
If the channel had been created with the check removed from the Create as a Mechanical
Element Object Option, these operations would work.
Click on the GENERIC EDIT Icon. Then, click ONCE on the channel.
You’ll find that the operations listed above will not perform their magic!
Before we call it a day, let’s do one last thing.
Click on the TAPPED HOLE Icon.
Select a ½ hole. ThroughType, UNC
series thread and make sure you
select the Solid Option.
Then, click on the OK Button.
Click on the channel.
With a CPlane established on the front face of the
channel, use the TwoPos Option and then, using
the CtrMid Option, click on the front left edge and
the front right edge of the channel.
You will now have tapped holes in both legs of the
channel.
Make a simple layout of the channel with top, front,
right and isometric views.
Click on the AUTOLABEL Icon.
The exact specifications for the tapped hole
are read from the database and a detailed
feature label is created for you.
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