linear cam (almost) with inventor

[GiGas]

Hello everyone,

with inventor 2010 I can't create a simulation for a linear cam
I suppose why not linear because the path of the same is made on the surface of a cylinder (tube) that extends for 90°
(All fig.1)

I have tried various solutions but, to me it seems, lacks the possibility to give it the path

as another test I tested a simulation with path made with a spline (but in 2d) and this works!
(all)

clearly the path of fig 1 is on a 3d path
how it is possible to obtain the simulation of the cam made on the tube?

thanks early to all those who can help me

corgially jampie

 

[meccanicamg]

Hello gigas,
Good evening and welcome (you have read that you should present yourself etc. see the forum rules).

the simulation of the linear cam system can be evaluated in the simulation module. you have to impose contact between screw and groove just as for the spline. I suggest you try some tutorials first and also look at the guide. there are many explanations about the couplings. then there are various types of methods, 2d contact, 3d contact and other types of bond that in simulation are active as those of assembly are not so evolved. I've been working with inv for a while but you can do it with a little bit of dismantling the first time you don't know how to do it.

 

[GiGas]

Hello mechanicalmg,

thank you for being interested in the problem

excuses and excuses for immediate intervention but I did not pay attention to this custom, to every good account I take care of mechanical design and
I appreciate a lot of inventor to consider it, for my use, irreplaceable and of which I do not know all the deeper aspects.

the case in question I would say is of common interest, so in solving it, can return useful also those who will have the same need.


...I commend this part of the answer because in the meantime I made other attempts and are successful in the intent :finger:

basically to get in the systama animation the path of the cam is necessary to introduce a new joint with the characteristic "contact 3d"
choose as component 1 the pin and as component 2 the entire cam asola

thanks anyway and to the next, gigas

 

[meccanicamg]

You did it!

 

[GiGas]

hello to all

after solving the problem of the 3d bond exposed above, I continued to develop the work until reaching with satisfaction the phase of the dynamic simulation where everything works regularly.

the problem arises now (always in "ambients") with the animation in inventor studio...by moving to the same set of objects used previously in dynamic simulation in the case of animation strange things happen:

es: wanting to create a movement of rotation-translation some objects disconnect from the constraints (only if you set an angle equal to or greater than 90°) so as to go to "space" for space 3d

if to avoid this disaster of scattered pieces you use a rotation angle < to 90° everything proceeds almost regularly

... the 3d constraints, however, the subject of the previous discussion "swipe", (in the sense that the rules of dynamic simulation do not apply) for which the pin "a" (fig.3) that should run within the linear cam (orange tube to which a translatory movement is applied Yellow arrows) and conduct in forced rotation the cylinder (violet "c") avoids doing so leaving the latter free to rotate (Green arrows) according to the rules of inertia that make it turn in a sense or in its opposite depending on the direction of the movement given to the whole (again yellow arrows)


in the hope of being explained I ask politely if someone can help me solve the problem (thanks anticipated)

 

[diegus]

in inventor studio there is the possibility of importing simulation made in simulation. After doing the simulation click on public in the studio (read the help that is not really simple).
to simulate the cam without simulation you can use the transient bond, select a face of the socket and then the cylindrical face of the pin.

 

[GiGas]

thanks diegus,

I followed your advice

(I must confess that I had not thought of the transitory bond)

I tried to apply it in "assembly" environment and it would look like functions

only that when I move the system (by manually posting it)
all constraints and objects move and work perfectly until the pin of the cam has not finished the first straight path, arrived at the beginning of the curve the whole system stops (in the sense that the action can not be continued in that direction but going back si)

p.s. I have selected transitory bond and as you told me, first the pin then the solid of which is part of the chameleon.

I will try the application only on the objects of figure 3 (eliminating all the others present in the axieme) to see if it works alone. If you have any other idea of why it doesn't work I'll be grateful for the answer

friendlyly jampietro

 

[GiGas]

I tried to create the transient bond of the cam (eliminating all the rest of the axieme to scan of errors)

result: the pin (or the screw in this case) is bound to circumference
head of the tube containing the cam (sometimes it is also placed on the opposite side) and here it moves as it was applied a tangency bond


...what idea?

greetings

 

[davide75]

use as a trajectory a sketch that follows the path cam and bind the pin to the sketch? ?

 

[GiGas]

thanks davide75

is a variant I have already experienced:

create from the path cam a sketch 3d

the problem is that when you go to create the "tangent" bond and select the created 3d path, you can select only one of the segments that make up it, so you can not achieve the complete path (this x regarding my experience)

if it were possible to transform the 3d path into a spline you could probably get some solution

among the many, pushed by this last idea, I tried to create a spline 3d but the philosophy is that it does not have straight strokes (as far as I can see) so the result was negative ( x use an euphemism).

I wish I could. to propose and make available the project to be able to test it to those of you who are interested in this Challenge on your pc (it is an interactive way to experience the problem in case you have escaped some detail)

I attached it to this in rar compression

I hope someone of you collect the "challenges" of being able to solve the mystery, thanks in advance


cordially g

 

[GiGas]

p.s. consideration:

if in dynamic simulation the system works
(Note: in this environment the 3d joint is created)

Why can't it work in other environments the same way?

 

[diegus]

hi gigas, the transient bond works well if you select first the inner face of the guide then the cylindrical face of the pin. I think I realized you did the opposite. In this way, he reads the tangency between the straight face and that of the connection.
to see the result well, then, insert a constraint (with appropriate offset) between the face of the tube and the axis of the pin and then the animi. Now I try to take a look at the model you posted and let them know.

 

[diegus]

I did some evidence on your set, actually also the transient constraint fails to turn the pin right into the asola. I think it is due to the fact that the asola in the curves does not have the walls perfectly in tangence with the straight traits. There is little to do, I also tried with other techniques to draw the asola but the result is always the same. I stop here, if anyone has any ideas.... .

 

[GiGas]

thanks many diegus for your commitment

we hope there are other willing!! !

p.s. I wanted to remember that in the "dynamic simulation" environment the system works

but it is not the same in "assembla" or in "inventor study"