Week 15

week 15

Machine design

Group assignment

1 design a machine that includes mechanism+actuation

+automation

2 build the mechanical parts and operate it manually

3 document the group project and your individual contribution

About this week

this is machine design week in which we all have to work in team to make machine which should have atleast 2axis movement and it include mechanisms+actuation+automation in this mechanisms is a system of parts working together or some linkages connected in a way that they may produce some motion , actuation is set in motion or activate some kind of motion for which we need actuator which are component of a machine that is responsible for moving and controlling a mechanism or system, and automation is automatic control

keeping this things in mind we stared searching ideas on which we together can work ,

Team

Gaurav wadhwa, Adhitya Ss, Tanvir Khorajiya, Rutuja Patel

the big idea

we have decided to plotter machine, which have interchangeble end-effector such as pen or cutter , and further intending to make this plotter to capture the image and draw the same on paper in real-time for this we use image processing which has explored by adhitiya in his week assignment so we will try to use that

Referances for the project

for collecting references i suggested to make Google sheet and tanveer made that in which we all share all the links / sources which we found on Internet in this we all can see what other have shared and also create repository of all references

the references which i found

1 cardboard cnc - source link

what good i find

modified mtm kit , rack and pinion mechanisms for uplifting pen

2 mini arduino cnc- source link

what good i find

they used inkspace for gcode generation it support grbl library

3 cnc plottter - source link

what good i find

they made nice acrylic body which we can fabricate easily

they used mobile to control cnc

for understanding workflow i refer previous year student work ex project illumina tea , and nills lecture on machine design As all of us did this same excersise so we found many referances and we get clearity of idea and how to make

my contribution in this project

As i am really excited about group project so i involve myself in all the activities and my major contribution in Designing 3d cad model of machine which involve bearing holder , rod holder etc .and i am involve in finalizing design , prototyping with cardboard, designing pulley holder,purchase rods and bearing ,3d printing parts etc.

prototyping nadya's mtm model

what good about reference which we selected

1 we seen many ploters all are having one motor in x axis and another motor in y axis and x axix is on top of y axis as this geometry give instability in design due to load distribution and in this one have both the motors on same axis i.e on y axis and one pully holder and end factor on x axis as we get good static balancing in this structure

reference design

, we finally go with reference of Jonathan K. which we find on thingiverse and his project presentation link we start with this design and doing modification in this

Modification in reference design

the refernace design have all the parts which have to be 3d printed so we use only central part i.e rods and bearing holder of that for referance design and i did modification in that and redesign that part also and we made all the other parts using laser cutting.

Designing stages of Machine

As for start designing in cad in 3d , we first print and test the reference design central part and redesign the other parts, laser cut them and first fixed them to check the mechanical movement of machine, in central part we find lots of problem that pullys are touching the side wall and and the bearings fixed also have very less distance between them , and it is difficult to insert the hand for taking belt out of central part considering all this changes i started with redesigning the central part in soliidworks (as the reference part is in .stl format so i can't edit it ) by taking reference design and removing all the errors in it

Final design of central part

top part