Holes and Threads

Holes and Threads - MAE 184 Vise Project Notes The Hole...

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MAE 184 – Vise Project Notes The Hole Tool The Hole Tool feature allows relatively easy placement of holes with either straight or more complex cross-sections without the necessity of a sketch or cut-extrude. Various hole profiles are provided to accommodate industry standard fasteners. Additionally, machining directions regarding operations such as threading can be automatically added to the hole feature. For more information on the hole feature, select the context-sensitive help icon, then click on the hole tool feature. Look at “About the Hole Feature User Interface” and “About the Hole Feature”. Come back to Help as required throughout this exercise. To start, take a look at part 3, the Jaw Plate. Let’s de-code the machining instructions attached to the drawing. They say to drill and C ounter S in K for a ¼ inch (nominal diameter) FL at- H ea D Mach ine Scr ew (see figure to right). The purpose of the flat-head screw and the countersink is to allow the head of the screw to be below the surface of the material it is fastening to provide a flush surface. Open a door and look at the way the hinges are fastened. What would happen if the screws weren’t countersunk? Look at page A-52 (in the appendix) of your text. Note the dimensions for the standard machine screws. The profile of the screw could be sketched and revolved with relative ease, but there is a more simple approach, especially for holes such as these having standard profiles. Let’s start with the extruded Jaw Plate part. For this exercise, I have excluded one of the holes in order to demonstrate two different methods of hole placement.
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Left, Countersink, Counterbore, and Die (for external threads) and right, Tap (for internal threads) Select the Hole Tool to initiate the Hole Tool dashboard. Consult the Help text as you proceed. We are going to create a standard hole, so select the appropriate icon and note the change in the dashboard as the standard profile icons appear. These icons represent Tapping (the addition of threads), counter- sink, and counterbore respectively from left to right. The difference between a countersink and a counterbore is that a counterbore has vertical walls. For this instance, per the drawing instructions we require the countersink, so we will select it. In the window next to the Standard Hole icon, we can select ISO (International Standards Organization), UNC (Unified National Coarse) or UNF (Unified National Fine). These refer to thread standards, the first pertaining to metric and the latter two to English standards. The hole we are placing now contains no threads, so this is not important here, but if you look at the original drawing on the Base part, you can see that the directions for the tapped hole that our screw will fit into is call for a ¼-20 UNC thread (1/4 inch diameter, 20 threads-per-inch), so we will select those values. The next step is to tell the program where to place the hole.
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Holes and Threads - MAE 184 Vise Project Notes The Hole...

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