Hello every body!
I’ve already posted an add on this forum in the arm section…But after a small night of sleep a few changes need to be done!
Let me explain the situation:
I am doing a practicle training at the imperial college in london. My project requires to position a kind of scanner over a produstion line. This scanner can be considered as a box of 666047 mm and needs to plug in to a 25 way cable. The scanner must weight a little less than a kilo. The problem I have is that right now the positionning of the scanner is made by hand wich is too slow. I then had this idea of using a robot to position the scanner. I have a lot of money for my project but not a huge amount either…This is why a small robots not very expensive would suit maybe.
I know not much about robots but stupid formulas wich I was taught at shool.
The positionning needs to be quite precise: 0,1mm In two directions only! The Z and X axis!
The range must not be huge!around 5 inches on the Z axis and 8 inches on the X axis!At first I wanted to use an arm robot for that…But in the end I think a cartesian robot could suit much better! There is one thing also…The scanner in the end has to be horizontal. I have no idea of wich solution would suit best…But the cheapest the quickest…The better
The last important thing you should know is that if the robot does suit my lab will probably be interested in buying more than one.
I will be happy to give any missing information.hopping that you will be able to help me!
Sincerelly yours
thomas
How about a rack and pinion gear setup using a stepper motor for each plane?
flying-pig.co.uk/mechanisms/ … inion.html
Or use linear slides
zaber.com/products/product_g … es%20Specs
The linear slide could suit…
But when I look at the specifications they are much better than what I require…
How heavy are those and how expensive are they?
thks for your time.
yeah sorry I saw the price…Its abit at the limit of what I can afford…
the question of the weight remains crutial though
Hey,
I just saw your post now, caught on late and thought about it.
If you’re still searching for a simple solution, why not just use a pair of threaded rods which connect to your robotic platform. That way, with a pair of suitable stepper motors you could get some really silly accuracy (say about 5/360 of a thread spacing…) My vision is that one stepper would turn one of the threaded rods in a fixed assembly. This acts kind of like a worm gear and moves your robot. On the moving assembly you can have the other stepper/rod combo that moves the thing say left and right. Response time might be a bit slow, but since the torque required will be minimal you should get them steppers going at a fair lick…
Or you could use encoders (little tachometer thingies) on some DC motors… but that may necessitate you looking into Quantitative Feedback Theory or something to ensure it’s still accurate enough and is nicely damped… personally, i think the stepper motor solution is the best.
you should be able to get that all done for something easily inside a varsity budget! (am busy burning one myself! - what else are bursaries for!?)
I’ve already posted an add on this forum in the arm section…But after a small night of sleep a few changes need to be done!