I need some help wrapping my head around Fusion’s hole function. I teach a tooling class that is pretty basic and encompasses things like drilling and tapping holes. For instance we would drill a .1495 hole to tap 10-24 threads. In fusion if I extrude a .1495 hole and then use the thread option it doesn’t offer a 10-24 thread. If I use the hole option with a threaded hole, it calls a .190 hole for #10 threads. I understand that .190 is the final hole size, what I don’t understand is how the program knows to drill the .1495 hole and then thread it. Basically I can’t get my mind wrapped around the setup and programming.
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In the past in most CAD Solid packages. you created all the features, an extruded hole, a helix curve, then a v groove cut extrude to create a modeled thread. Almost all the newer packages give you an easy click to perform the same process. The information is stored in a table, so when you specifiy the type of hole, whether it be a reamed hole, or a counter-bore, or a threaded hole, you will be prompted for a few variables, such as; is it a thru hole, how deep is the tap drill, how deep is the thread. Most will default a thread depth based on percentages that have been derived over time. Most often all you need to do is sketch points in the hole locations you desire, then go create a thread feature and select the points.
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The hole command works off the current size (major diameter) to determine the thread not the predrill size. I’m not sure why. I tend to use points, then use the hole command rather than drawing the circles and extruding, then threding separately. I’ve done both but I prefer points for holes now. There’s always multiple ways of getting things done in CAD. Hope this helps.
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Barry
Using the major diameter is the correct choice if you wish to show the threads.
When you get to the manufacturing side of it you have to choose your drill size regardless of the represented hole/thread. So it all works out in the end.
Top Hole is Drawing a .250 hole then using Thread on 3D Tab has to be major Dia.
Bottom Hole is Point using Hole Command under 3D tab and setting the size you want and it will use minor Dia.
Either way works fine just depends on what is faster or you are use to doing.
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