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Trapezoidal Pulleys

Ribbon: Top Mechanical Draw > Mechanical Library > Gears > Trapezoidal Pulleys

A convenient feature for the drawing of trapezoidal pulleys and related belts is made available to the user.

The types of pulleys available are four:

Tabella 21. Trapezoidal Pulley Library Table

In order to allow the user to quickly select the type of pulley, its execution and the other parameters it is launched a simple and intuitive dialogue box allowing the end user to freely move with the commands that will be subsequently described.

As with all other normalized libraries you can create a part in order to have automatically added the pieces used to the bill of materials. The part number related to the pulley can be customized at will by editing its value in the specific space. If this value is not entered, the code will be created automatically.

Activating the Encoding Menu button appears a dialogue box that allows user to select a particular pulley among all (and only) those encoded.

• What
• Shows a dialogue box where you can determine the type and the specific parameters of a pulley to enter in the drawing in a precise and functional way.

• Why
• The command is used for the correct pulleys drawing with dimensioning according to the law indicating the type, the profile and the number of grooves besides the desired line containing the essential characteristics in the specific selection list of the dialogue.

• How
• The dialogue box referring to the command Top_PullTrap is divided into four main areas as it can easily be seen from the figure below.

On the top left there is the figure that shows a preview of the piece selected by the user through the various controls. By clicking on this image you can change the various views of the pulley. Still in the same section, below the image, there are three drop-down menus that allow you to select the type of pulley, the profile of the grooves and finally the number of grooves. Even whithin the first column of the dialogue we find immediately below the edit-box where the user can enter the code of the pulley.

Besides the Encoding Menu button already described, within the central section, we find the part reserved to changing of the central hole of the pulley whose size can be inserted according to different modalities depending on the type of pulley. As a general rule, for the most part of the pulleys, the diameter of the central hole can be entered from keyboard or selected to screen through the selection of two points into the special edit box of the first line. In any case the measurement so obtained must be always between Dm and d. For pulleys with clamping bush this edit box is disabled, while the underlying drop-menu is enabled, from which you can select a specific hole diameter from those available for the bush that is mounted from that particular pulley. A pulley inserted with this type of bush has always a hole for tongue, as bushes are already produced in this way. If you select a pulley that has not a bush the section below is also made available, from where it is possible to select the type of hole that you want to make. So as in other libraries here you also have the opportunity to decide if you want a smooth hole or for tongue and the place where to make the fissure for this.

In the bottom of this column, the last control allows us to eventually select the belt that must be mounted on this pulley. By clicking on "Select" button then you'll see the dialogue below.

Example 150. Draw Trapezoidal Pulley

(Dialogue...) Insertion Point: Insertion Angle: