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Electronics / Re: Wafers handling robotics arms
« Last post by Billy on Today at 04:25:34 PM »
You still haven't said why you're asking, but I'll give you my thoughts.

1 - They may claim 1um accuracy (I didn't see that claim on the link you provided) but I don't buy it for a minute. The robots drift over time and vibration of the end-effector can be a serious issue. I could buy 100um repeatability in a production environment. You get better results if you run them very slowly or pause before picking up or setting down to allow for vibration to die out.

2 - The wafer processing machines have either the ability to precisely position the wafers or to precisely detect the wafer position so that operations can be performed with single digit nanometer (nm) precision. The robots only have to get the wafer close to where they are supposed to be. The processing machines take over after that.

3 - Even if the robots had um level repeatability, the machine operators still have to teach the robots and in my experience, getting the wafers close is all that is possible. (Disclaimer: I have never taught a robot myself. Only dealt with customers that are angry about wafer handling issues)

4 - Wafer safety - the robots have to be accurate enough to get wafers from the carriers (FOUPs) and put them back without banging them into things. Any inadvertent contact will generate particles that will contaminate the wafer. So if the wafer brushes up against the side of the FOUP on it's way in or way out, it will get microscopic plastic or silicon particles on the surface that will damage the yield. When setting the wafer down or picking it up, any sliding motion on the support surface (FOUP or robot) will generate particles as well or cause scratches.

5 - While I am chronically unimpressed with the mechanical performance of these robots, I am impressed by the level of cleanliness they achieve. Particles released into the air are killers for wafers so these robots have to have extremely low level of particles that are released in the same air space as the wafer. The cleanest hospital operating room in the world would be disastrous for a wafer. Simply exposing it to the atmosphere in the room would render it worthless. Something as large as a single bacteria would be considered a huge particle if found on a wafer.  So the robots kind of suck, but they are clean.

Additional disclaimer: I have no experience with the company in the link in the OP. My comments are based on personal opinion only and do not represent the opinions of anyone or anything else. 
Electronics / Re: Wafers handling robotics arms
« Last post by Ana_Dig on Today at 02:24:03 PM »
If you will know about one university in the entire world that teach one course that teach about what I ask in this tread so I will glad to know about that, I try to find but I didn't succeed.
my questions are correlated to robotics in semiconductor manufacturing industry.
Electronics / Re: Wafers handling robotics arms
« Last post by Billy on Yesterday at 05:31:05 PM »
Why are you asking?
If this is a school assignment you should put that up front.
That said, I work at a semiconductor manufacturing equipment supplier that uses these robots.
Why are you asking?

Hey Guys - given that a continuous rotation servo is a geared DC motor it seems to me that RMF calculator could be used to to choose a servo for a small robot 2-3.0 lbs. for inclines of say 10-15 degrees with 4 drive wheels.

Is that a good or bad thinking?

Finding the upper limit of of CR servo use would allow for the use of say a 16 channel PWM/Servo Driver for Raspberry Pi, which in turn would allow for adding sensors, LEDs and other bells and whistles. Thus I could use a single homemade chassis to grow the robot so to speak.

Thanks for any advice you may provide.

Electronics / Wafers handling robotics arms
« Last post by Ana_Dig on September 14, 2014, 01:38:16 AM »
Hi to all the forum members, my questions for this tread are correlated to the robotics arms for wafers like the robotics arms that are in this website:
1. why is so important to build very very accuracy robotics arms, Wafer Handling Systems , in the machines of semiconductors industry that arrive to 1 micro meter accuracy? in other words why the semiconductors industries invest a lot of money in research and development of very very accuracy robotics arms? and how it will make the chips for the CPU of the computers or smartphones better?
2. If the wafer that the robotics arm move was have 300 millimeters diameter and now the wafer diameter enlarge to 450 millimeters so the wafer became to be heavier and bigger so what need to change in the robotics arm for wafers with 300 millimeters diameters that it will continue to be very very accuracy also for wafers with 450 millimeters diameter?

I think, but I am not sure, maybe the answer can be correlated also to very very accuracy machines productions or Hard Disk Drivers that are also very very accuracy.
I also will be happy to receive from the forum members links to article websites or relevant books like from google books or relevant lectures like from youtube education that are correlated to these questions, thank you.
Electronics / Re: Bluetooth controlled robot
« Last post by garriwilson on September 12, 2014, 02:34:26 PM »
Or does UART basically allow you to run a code from your computer and the microcontroller receives and executes it through its Rx and Tx terminals? That seems too easy/useful/magical to be true
Electronics / Bluetooth controlled robot
« Last post by garriwilson on September 12, 2014, 01:58:40 PM »
Hey guys,

I've been reading up on UART and bluetooth on the forum and the tutorials and I have some questions.

So this is the general idea that I got of how Bluetooth UART would work:

Computer/Phone <--> USB <--> Bluetooth ~~~~ Bluetooth on robot <---> Tx and Rx to microcontroller

I've seen in the tutorials and explanations on how to get data or messages to print from the robot to the computer. What I'm interested is in sending signals the other way, from the computer to the robot to control its movements. How would I do that? Ultimately I know that the signal from the computer would reach the Tx and Rx pins on the microcontroller, but what would the signal be? Is it digital 0 and 1? Can it be analog 1-255? Or can you send actual C code to the microcontroller for it to perform? And what on your computer would you use to send a signal to the robot? Is it HyperTerminal?

Also, what is the difference between these?


The first one looks like what I need, just Tx/Rx pins and Power/GND.  But what's  the difference between a bluetooth modem vs module?

Mechanics and Construction / [advertisement] Easily create a linear slide motion
« Last post by ServoCity on September 12, 2014, 09:36:11 AM »
You can now build linear slides with our Actobotic beams and gear racks! The 32 pitch gear racks attach directly to our 11.935 beams, but can easily be cut-down to work with shorter beams. Perfect for steering rack systems or building your own linear actuator. When used in conjunction with beam brackets S, T or U the possibilities are endless. Made from durable Delrin.


Electronics / Re: microcontroller with led
« Last post by nidalxbot on September 12, 2014, 09:30:18 AM »
Where it says "no link here" there should be a link. On a breadboards that I have all of those power pins are connected so it looks like your battery 9V is connected to 7805 input and output. If all is connected correctly you should measure 5V ant 7805 output.
I would first connect everything except power to the controller.
Then measure if supply voltage is correct, 5V. And if it is then connect controller to supply.
Electronics / microcontroller with led
« Last post by ansh on September 12, 2014, 01:57:42 AM »
I need help, I am beginner , I want to learn something by doing some work on hardware  I bought some electronics lab tools and component

 I want to blink Led using microcontroller

microcontroller -p89v51rd2
wires black, yellow
battery 9 v dc
Electrolytic Capacitors 1000 μF
diode 1n4007
Ceramic Capacitors 22 ρf
7805 regulator
crystal oscillator

I have made some connection on breadboard how to know that my controller and programmer circuit is working correctly

so I used multimeter I measured supply voltage for microcontroller I got 3.95 vdc and I saw 3.65 vdc for programmer circuit

so I am wrong  or I am correct ?
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