![]() ![]() If the units of the moment of inertia is different from Kg. The estimate is based on the mass, inertia, and distance of the tooling’s center of gravity from the endplate of the selected robot. In the example above, the value we are looking for is I2 5.556 Kg.m 2, since the assembly will rotate on the Y axis. Our Payload Calculator is a FREE online payload calculation tool, that anticipates the moments and the inertia that your designed end of arm tooling will apply to your robot. The image below is an example of how it should be sent The block has a mass of 3 kg and the mass of the semicylinder is 5 kg. Click on the “Print Screen” button on your computer and send the image of the piece + moment of inertia to Posibras. Determine the location of y of the center of mass G of the assembly and then calculate the moment of inertia about an axis perpendicular to the page and passing through G. The values of the moment of inertia related to the objects that will rotate around the Y axis are represented in box I2. In the document properties screen, click on “Units” and change the units Length to meter and Mass to Kilogramģ – Align the rotating disk of the assembly in the XZ plan using the “Constrain” iconĤ – Also align the Inventor Origin with the center of the assembly’s rotating disk using the “Constrain” iconĥ – With the right mouse button, click the first menu item on the left and then click the left mouse button on the “iProperties” submenu and a new assembly properties screen will appearĦ – In this new properties screen, click on the “Physical” tab, then the “Update” button and then the “Main” button. All items must have their measurements and total mass well definedĢ – Change the units, using the “Tools / Document Settings” menu. Inventor 1 – Create a new assembly including only the items to be moved by the indexed table (discs, devices, screws, parts etc). If the assembly was balanced than Pz and Lzz would have the exact same value In the example above, the value we are looking is Lzz 240,25 Kgm 2, provided the assembly will rotate around axial Z. Find an example of how the image should look below Press “Print Screen” on your keyboard and send us the image you’ve created including the values for moment of inertia. It’s important to be able to see X, Y and Z axials of the UCS, as the UCS doesn’t always coincide with the UCS positioned at the bottom left of your Solidworks screen. Arrange the assembly so you can see both the moment of inertia and the center of the assembly. In the example below you will see an unbalanced assembly. If the assembly is balanced, the UCS will be placed to the center of the part. When the new screen is ready click onto “Options” and change the unit of measurement for mass to “Kilograms” and length to “Meters”Ħ – Note that Soliworks has now added to the centre of mass of the object a pink-ish UCS. The positioning must be of “concentric” typeĥ – Deselect all objects, then go to menu “Evaluate -> Properties of Mass”. Position should be defined as “coincident”Ĥ – Make sure you also align the origin of Solidworks with the center of the spinning disc of your assembly using the Clips icon. All items must have their measurements and total mass well definedĢ – Allow the assembly to float by right-clicking over itģ – Align the moving disc to one of the axials using the Clips icon. Solidworks 1 – Create a new assembly including only the items to be moved by the indexed table (discs, devices, screws, parts etc). Please check with your CAD manufacturer for the calculation procedure. Other CADs are quite similar in the way of obtaining the calculation. In many CAD programms,for each profile, you can find not only the moment of inertia but the Section Modulus of this profile. We developed the step-by-step below to facilitate the identification of the moment of inertia of your set that will be moved by the indexing table, using the CAD tool Solidworks and Inventor. There are several ways of knowing the moment of inertia:Ī) manually, through mathematical calculationsĬ) using a CAD (Solidworks, Inventor, Catia, NX, etc …) The calculation of the moment of inertia of your set is one of the main data that we need to know in order to identify which indexing table best suits your need, without running the risk of oversizing it, bringing high costs to your project, or undersizing it, bringing less resistance than your need. The further away from the turning center the masses are, the greater the moment of inertia. ![]() Determine its mass, center of mass, moments of inertia, and products of inertia. ![]() Generally the unit is Kg.m2 (kilogram-metre square). Consider the rectangular beam shown in the figure. 7.1.3 Using SOLIDWORKS to Calculate Moment of Inertia The procedure given above was rather lengthy and prone to error. Calculation of the moment of inertia in Solidworks or Inventor In mechanics, the moment of inertia, or moment of mass inertia, expresses the degree of difficulty in changing the state of movement of a rotating body. ![]()
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