DoF - a Robotiq Community
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@lakshmip001 yes you can play with the friction coefficient to increase your payload. The payload calculation is detailed in the instruction manual section 6.2. Same thing with the custom fingertips, some dimensions are specified. The graph is lacking a dimension in X (what you are trying to do), you should respect the same dimensions then the Y specifications.

When looking at those charts you will probably notice that grip force decrease with an increase in finger opening. Thus if you use the 2-F-140 and increase it's opening to maximum you will be able to pick you part of 268 mm but only with a grip force of 40 N.