Recent content by Factao

Allow me a quick reformulation: When the angle is going up, more the the constraint on the mechanism is going up, and more the rotation of the unactuated part of the joint is phasing out. Is ist right? And if it is, could a double cardan joint resolve this phasing issue?

I would gladly share such a thing as soon as I accomplish my project, which should follow to the creation of this damn wrist. However, if you have knowledge of the following matter, do you know if a double cartan, such as the one you shared, can transmit motion as efficiently while their are...

Just to be sure that we understand each other about the use of this cable and elastic system, here is another schema, where E is the force creating a torque by the elastic, and T is the force applied by the cable. R and B are some force creating a torque on the red and blue axis. As for the...

Thank for your answer Tom, but my second idea is using a double cardant. Please, would you tell me if the schema was too simplified or unclear? Yes, I did this for the finger. If we count the DOF in any finger (except the ring one), we can count 4 of them. Three are on the same plan, and I am...

Well, let's hope that nobody is going to see it...

Hello, As a personal project,I am currently designing a mechatronic hand, with a number of DOF similar to our hand. I've choose to transmit the axial movement of a finger through a rotary motion, because cable where causing too many backslash an other linear transmission became severely more...

Thank you for this. I kind of forget how to set this tread as resolved... How do I do that?

Well, thank you for this, I will massage him.

http://emanual.robotis.com/docs/en/dxl/x/xl430-w250/#specifications This little beast is quite balanced for its price. As for the gears, I understand, from your reply that undercut gear doesn't affect the precision more than normal one, unless I miss something.

I am 3D printing (FDM) my gears with PLA, so I am expecting a low torque, a low speed and a MTBF as considerable as the error margin. However, I could reformulate my question: If we consider the same manufacturing processus, material and similar usage condition, will a pair of undercuts gears be...

There is no precision issue?

As summarized, I've got these two gear, and another stage of 15:10. I need my gear box as small as possible, and I've never work on this scale with gear (the module is 0,9mm, so this is pretty small). I know that this question is very simple, but I did not find anything relevant on the web, so...

After some experimentation, it seems that using the sommation of both the cable and pulley radius is effectively an excellent estimation, Since I only obtain value that are very close, I think that it is confirm, even if I did not take a lot of measure.

Here is the schematic of the system. It is the first time that I am using inventor to draw, thus I must apologize for the quality of this one. This draw have dimension that are 10 time the original one and these are millimeter. For your question: -Yes, the bigger pulley is just 0.4". -The...