Awesome
Hi Dickel
This is an awesome robot! The time spend sorting out the mechanics has definitely paid dividends and now you are controlling it effortlyless with some preety powerful hardware. I’m very interested to see where this goes.
I find you construction technique very interesting. Do you find polstyrene a strong enough for purpose? It obviously works well but when you lift an object with thr robot arm, is the strength limited by the servo’s rather than than the arm itself?
Clive
Hi Clive! Thank you very
Hi Clive! Thank you very much!
Surely I’ll have to do some improvements in many parts (mechanicals) of this project. I think the polystyrene is strong enough for whatever you want to do with it, but must be used with the right thickness. For example, for the long tracks bracket I’m using just 6mm thick (3 layers of 2mm combined), and it’s not enough, because when the robot passes over some object, the bracket bends a bit. For this part I think will need 10 mm thick, or a horizontal reinforcing bar, along all the part.
For the long part of the body inclination (Lynxmotion femur clone), something similar occurrs (it’s now just 4mm thick), and I think for this part I’ll need 6mm thick. Also, will need to change the servo (currently using a HS-645MG, and I’m searching for a stronger alternative).
About the question of lifting object, stronger servos will do the work without any problems. But this part of the project don’t concerns me now, and I think it’s working pretty well if you consider that I’m using only micro and mini servos. For example, for the shoulder pitch servo I’m using a Hitec HS-5245MG (his torque is about 4.4kgf/cm @ 4.8V). For the shoulder yaw servo I’m using a Hitec HS-225MG (his torque is about 3.9kgf/cm @ 4.8V). For the elbow servo I’m using a Hitec HS-82MG (his torque is about 2.8kgf/cm @ 4.8V). But I have plans to upgrade some servos…
For the torso rotation don’t need a much stronger servo, because the weight of the torso will be counterbalanced when the robot will have their two arms. 
… But aditionally I’ve ordered this piece (below picture, Load Bearing Servo Block for Hitec standard servos)…
… and it will prevent (if some overloading happens) the damage of the output shaft of the servo. Would be nice to have it also on the two arms shoulder pitch.
But resuming… I think the polystyrene is a strong material, however must be used with the right thickness… Greater the lenght of piece is, thicker must be. And for the servo brackets that I’ve custom made, 4mm thick is strong enough.
Mech-Dickel
Thanks for the very detailed
Thanks for the very detailed reply! I must say your robot looks very professional, and you seem to have a good handle on build strength. I’m keen to give your building techniques a try sometime as I’ve not really worked with much else than wood and metal in the past.
Good to learn some new skills
Watching to see your progress !
Thank you one more time for
Thank you one more time for your nice comment! If you want to try something with polystyrene or PVC with the method that I use, take a look at this tutorial https://www.robotshop.com/letsmakerobots/node/32828 . It’s not so much documented, but can help you a bit.
Mech-Dickel
amazing peace of art
Once again,
Amazing work,
I want to reproduce this projec
Is it possible to post the templates?
I already have the md#3
Thanks man!
Hi, matana21! Sorry for the
Hi, matana21! Sorry for the late answer.
Here (https://drive.google.com/file/d/0B2gOXfxaf2xjSTFmU3FXYm9Kdkk/view?usp=sharing) is the template for the brackets of the tracks (it’s not in the real scale).
Track scale
Great job sir!!!
i’m not a expert, but how you convert the template scale to the real scale for the printer.
Thanks for any respond!!
Thank you very much!To print
Thank you very much!
To print it in real size I just paste the image file in a text editor and adjust the document to be borderless, than print it in A4 paper sheet (210 X 297 mm).
controll the servos
Very good robot, how can you control this servo without interference with other. in my project when I move one servo estep by step the other moves continuou when I press the button by PS2 control
I am using arduino mega and PS2.
could you show the arduino code?
thanks. Adilson
Hi, Adilson! Nice to see
Hi, Adilson! Nice to see another brazilian guy here!
Take a look on this other project of mine (it’s an improved version of MDi #2): https://www.robotshop.com/letsmakerobots/mdi-3
The code is on the “Attachment” files. I guess the code of this project can help you better.
