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All, I need to check if a table with a motor mounted on top of it will stand still or not under a rotational torque, i.e. starting torque of the motor. I added a top view of the square table with 4 legs (black). The rotation axis of the motor is indicated with a blue dot and is not in the...

I want to calculate the inertia of a SCARA robot. The arms/end effector move only in the XY-plane by rotating its 3 arms. How do I calculate the total inertia around the Z-axis? I_arm_1_Z = I_arm_1_COG + m1.r1^2 I_arm_2_Z = I_arm_1_COG + m2.r2^2 I_arm_3_Z = I_arm_3_COG + m3.r3^2 I...

Yes, the robot is fixed to a base plate which is mounted to the table frame. The 4 legs cannot be bolted in the floor.

Hi ThomasH, Yes, the three arms move only in the XY-plane by rotation of the arms around theta 1, theta 2, theta 3. The gravitational force is in the negative Z-direction. I have defined the mass of each arm in its COG wrt the XYZ-cordinate system (indicated by the blue dots below) using point...

Hi rb1957, Why should I forget about the table? If the inertia of the robot arm is too large then the table could move/dance on the floor as it is not bolted to the floor. I check also the load on the interface between the table and the robot in Ansys. The COG of the three arms together will...

Dear, I have to design a table for a SCARA robot which will be mounted on top of this table. I'm not allowed to bolt the table (consisting of 4 legs bosch frame and aluminium top plate) on the ground (drilling of holes in the ground is not allowed). I need to know if the table will stand still...

Hi, I have a composite wall of two layers of materials A and B tightly fitted to one another. The cross-sectional area of A and B are not equal. Questions: - is the conduction Q through material A and B equal? If so, then the heat flux (Q/cross-sectional area) through material A and B are not...

I want to reduce the heat conduction through a steel rod by locally reducing the cross-section of the steel rod. However, it seems that the conduction through the rod is not dependent on the position of the reduced cross-section (i.e. near the hot or cold surface). I'm trying to explain this...

Thank you!

Hi xnuke, Thank you for your reply. So my B matrix is: [0; 1/m] And u is: bWY cos (Wt) + kY sin (Wt) If xdot is: [x'; x''] Right? Steven

Hi IRstuff, Thank you for the link. This is almost what I'm looking for (slide 52). However, I'm struggling to write the harmonic forcing functions (2.63) in state-space format (B matrix). Analytical, they do a superposition of the two individual particular solutions. Have you an idea of how...

Dear, I want to make a state space model of a simple mass spring damper system with a base excitation as shown in the figure below. The equation of motion is: mx'' + bx' + kx = ky + by' How can I write this in state space (A,B,C,D) format? I have difficulties with finding the B matrix. y(t)...

All, I'm designing a construction with 2 leaf springs in parallel. I have found the formulas to calculate the lateral stiffness of the leaf springs on following website: https://www.janssenprecisionengineering.com/page/flexure-guiding-2-leaf-springs-in-parallel/ However, in my case, both leaf...

Ok, thanks for the tips. I will take a look at it.

Ok, that's the answer I was looking for ;-) Can you maybe explain why the bottom plate does nothing in this case and why it does when it was vertical?

Hi, Is there a simple formula to calculate the lateral stiffness of a compression spring when both ends stay in parallel (see figure in attachment)?

Hi IRstuff, I know how to calculate a spring force. That is not what I'm looking for. I want to know what the total external force (atmospheric pressure) is that is acting on the springs, irregardless of the spring constant, seal properties etc. Is this 1 bar x the top surface or 1 bar x (top...

Hi Greg, I hoped I was still a student ;-) Ok, let’s put it differently. I doubt if it is one (only over the top plate) or two times (over the bottom and top plate) the pressure drop of 1 bar force that acts on the springs. Thus 100 kN or 200 kN.

Hi, I have a bottom plate resting on a table (see figure in attachment). On top of this bottom plate is are series of springs and on top of it rests a top plate. Between the bottom and top plate (inside the springs) is a seal to create a vacuum chamber. Question: what is the total vacuum force...

Hi, Does someone know how I can calculate the temperature rise from turning a screw spindle in a nut (thus no ball screw)? The spindle is of stainless steel, the nut of brass. I don't use any lubrication. Thanks.