Recent content by zoltrix

hello I see that 3d printers are becoming more a more popular for mechanical engineering also for education I think that PLA scaled models of mechanisms can be of use for kinematic analysis but I wonder whether they are of use also for dynamics or even for stress analysis I try to explain my...

Are core XY 3d printers really better than bed slinger ones for mechanical engineering ? I mean, as far as accuracy i.e. tight tolerances,. are concerned ? Does anybody own both models for a proper comparison ?

in my opinion the future (or even the present) of mechanical engineering is mechatronics because : #1 all mechanical devices are fitted with electronic controllers #2 complicated mechanical linkages have been replaced by simple electronic cams #3 a sophisticated automation control theory is...

hello my system is quite simple but does it really work , regardless of its weak points ? suppose you want to move the head from the home position to a point P1 and then to a point P2 the sequence : home-P1-home- P2 it should work since the networks returns the parameters to move the head from...

@Borg Yes I want to know how to set the servos based on a given x,y,z postition I key_in the 4 outputs returned by the network and the head move to the wished position I accept that there is not an unique solution The solution proposed by the nn might not be the optimal one or it might...

Please ,might you stick to the point may I have an answer to my simple and clear question ? I did not ask how to build a a state of art robot anyway, how to avoid instabilities and oscillations how optimized movement , energy efficiency acceptable stress on the joints etc Given a wished...

ok , I got it The first part of my idea is correct,fine with direct kinematics you can build up a number of training sets : a11,a21,a31,a41 -> x1,y1,z1 a12,a22,a32,a42 -> x2,y2,z2 ...................................................... a1n,a2n,a3n,a4n -> xn,yn,zn whereas a1n,a2n,a3n,a4n are the...

I think Borg did not read my post I guess he was talking about a humanoid moving robot have a look at the pic, there is a maze, he mentioned agents and all that stuff I was talking about a much simpler fixed intallation, a Scara robot That's why I replied: "my targets are not that ambitious...

ok I dont insist, you dont know the answer anyway I think that my claim is right if you know the servo motors angles, the geometry of the robot and its initial position it should be enough to build up the rotation matrices and multiply them the result of the multiplication is a vector...

since you quoted my last post followed by "then no" I simply asked you , ist wrong that : "Given the 4 angles of the servo motors the xyz coordinates of the head or, better, the xyz coords of a selected point of the head, are perfectly defined, assuming of course that the robot is made of rigid...

Do you mind to support your answer with an explanation ? what's wrong in my last post ?

Probably my targets are not that ambition Given the 4 angles of the servo motors the xyz coordinates of the head or, better, the xyz coords of a selected point of the head, are perfectly defined, assuming of course that the robot is made of rigid bodies only There is only one final state of...

I mean the nn should return the rotation angles of the 4 servo motors in order to reach the wished position (x,y,z) for the robot head , always starting from the home position of the robot this to avoid the much more complicated inverse kinematics

moving from one point to another

hello Take a 4 dof scara robot Calculate the x-y-z coordinates of the robot head , given the rotation angles of the 4 servo motors You can use the direct kinematics method Repeat this exercise a suitable number of times Train a neural net works of 3 neuron inputs (x,y,z) and 4 neurons outputs...