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It's been explained to you before why I2C shouldn't be use. It's a noise issue. Do you have a working feeder(s) to showcase on a machine?
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Hmm CNC = much higher cost. Here is what I was thinking of 3D printing for a "clip" design that gets sandwiched between both PCBs.
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I agree that it can flex. That was my concern too. However, this also depends on the linear rod material and diameter. I have some samples here that are about 250mm long and don't flex. It may vibrate a bit when adding/removing feeders, but should return to position once untouched. The issue I see right away other than cost with your design is it would require increasing the feeder size significantly as there's no more room left.
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I need some 30 good feeders. Now I have some feeders but they are not precise enough for 0402. I think about pneumatic yamaha but it's complex plate and not cheap, electrical yamaha - simple plate but expensive feeders...
Do you live in around of EU or US?
Push forward with it and see if the design works for you and if you have any issues with I2C you can always modify the design.
Good on you for getting a decent design that works in a small footprint.
If you want to send me something to make I'll run it for you.
The group is to exchange the thoughts, not to agree with everything.
For me the feeder looks very very cool. Except the shutter lack and i2c ;). But it's still far from good working... Some 1-2 years ago, here was a man named Darren with Assisi very promising project of the feeder. I remember "he had a dream" but it looks he woke up and forgot about it ;). Let's wait so...
The Attiny84 I am using on the feeder doesn't have RX/TX pins. I would need a different IC. Just how much better is RS485 than I2C? And is anyone willing to code the Arduino?
#include "SoftwareSerial.h"const int Rx = SDA; // change as neededconst int Tx = SCL; // to match your circuitSoftwareSerial rs485Serial(Rx, Tx);void setup(){
pinMode(Rx, INPUT);pinMode(Tx, OUTPUT);rs485Serial.begin(9600);
}byte resp[...size...];void loop() {
rs485Serial.write(... some command...);resp = rs485Serial.read(); ...
}
In continuation of my last post here on I2C feeder design, which allows the flexibility to move feeders along an axis without the need for mechanically indexing them, here is a picture of my first working prototype without a sprocket. I hooked it up to a breadboard setup to test. My next plan is to get CNC'd PCBs. These PCBs are expensive at low volume and my hope is that others here may also be interested in this to help out in developing it. In doing so, I am wondering how many would like to join in on the first round of prototypes? I have most of the pieces already, just need to buy more motors to match the volume of PCBs and 3D print the cover of each feeder from PLA (which is a non critical part for dimensional accuracy). The sprocket will also be made out of 1mm thick PCB. This would include the motherboard to plug the feeders into as well. All the feeders will be SMT assembled, but ship mechanically un-assembled (to save space in shipping box). The feeder is designed to work with all tape types shown on this guide: http://www.vishay.com/docs/60034/tapereel.pdf This includes proper min bend radius of wider tapes. This first batch will only be for 8mm wide tapes, but the feeder is designed to be expandable to wider tapes by swapping the standoffs and dowels to longer ones. The entire setup runs on Arduino code and uses two optical sensors. What still needs to be figured out is the mounting of the feeders to the motherboard. Currently there are two holes on top and under the 5 pin spring connector as you can see, but these don't work well. The idea was to have it clip onto two rods, but PCBs don't flex well enough to make it work. Any suggestions appreciated.
How many people here would be interested in getting these feeders in classic green color and what is a price point that works for you so I can calculate the volume required to meet that price point? Please also let me know quantity you would be interested in. My hope is to get enough people interested so we can lower the price point with a group buy. Note that these have only been mechanically tested, but the code is ready and compiles.
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One question that might have been answered, but I could not find it:
Why would you use a pcb for the sprocket.
Lasercut steel would be really precise and cost very little in high quantity.
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I've submitted the design to the manufacturer and hope to have them start making samples after Chinese New Year, which would be start of February. I'll be testing these with I2C to at least know that the mechanics work.
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Happy to share that first round of samples is finally being shipped over. These are pictures sent by the manufacturer. Due to the virus going on, it was delayed over a month. Will post some pictures once I have it assembled and running! Getting close :)
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I did a test sprocket out of StainlesSteel - laser cut 1.1mm plate in UK
The issue is that the holes for sensor can not be cutt very nice - some debries from Laser cutting remain
See picture enclosed
Mike
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What sensor do they use? Seems like they're counting the spur gear teeth rather than sprocket?
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More images added to the bottom of the album, showing the sensor and it's placement: https://imgur.com/a/osEGCUnfortunately there doesn't appear to be any markings on it. It looks quite a lot like this one: https://www.digikey.com/product-detail/en/rohm-semiconductor/RPI-352/511-1351-ND/638549Jason
On Sun, Mar 15, 2020 at 4:47 PM Shai <shai...@gmail.com> wrote:
Sounds good Jason! I think if they are just measuring the sprocket, those are some pretty big angles... not sure how they keep it precise?--On another note, I'm considering possibly opening up a tool to injection mold custom sprockets with gears. What are some things to consider for the design and anything missing? Trying to figure out what's the best way to design this so it works well for everyone once (if) produced.
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Hi Jason, how does your Neoden feeder do 2mm feeding since there's only one sensor?
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Hi Jim,
Can you place some link to this Chinese Nxp feeder that you have, pls? I thought they clone the yamaha only.
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Countersinks is possible on PCBs but there are none in this design. Using flat screw heads that are very thin. Took advantage of everything possible to save cost :)
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ohh okay, thanks for explaining. Seems like they aren't easy to find in the size that I need.
On Fri, Mar 20, 2020 at 2:15 PM Shai <shai...@gmail.com> wrote:
Countersinks is possible on PCBs but there are none in this design. Using flat screw heads that are very thin. Took advantage of everything possible to save cost :)--
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As I continue to improve this design, what features do people recommend adding to the feeder? I have just added forward/reverse buttons for when loading/unloading the feeder, which I intend to have them move in 2mm increments (or move until released). What other features would you like to see added?
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