Author Topic: You don't need correction for everything !  (Read 1284 times)


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You don't need correction for everything !
« on: May 09, 2017, 10:17:31 PM »
I just wasted a day but learned a lesson which everybody else probably already knew !

I was trying to effectively place 1W loose bead LEDs as the type I wanted were only available in this footprint.

After a bit of thought, I made a track for the vibratory feeder by using a K40 laser to engrave acrylic.
the main areas were removed just leaving tracks rather like railway lines...
the Beads stay aligned and just about keep the machine fed..
( I did celebrate at that point !   ;D )

A few tries with different nozzle arrangements and I ended up with a spare Nozzle 5 drilled out
it fits completely over the lens and sites on the white body of the Led
This was effective at keeping the LED level when in movement.
I did however have to find a spare nozzle 5 holder ( the bit that is captive in the tool rack)
as it has a bigger diameter central hole than the others.

Once I got that sorted, I thought I had it cracked...    ::)

However, the optical correction parameters were a nightmare.
First, they are too big to be imaged in one go..
second, the leads reflect light and sometimes appear light, and sometimes dark
third, a slight distortion of the legs also upsets the camera...  and so on
I spent the best part of a day playing with the various settings until I found the one that mattered..
set correction type to .........."No Correction" !

to be honest, I didn't think about it, I just clicked it in desperation.... !

The machine picked and placed at all sorts of weird angles correctly first time every time.

The point is, with a clunking great component like the LED, with mahoosive pads..
doesn't need to be placed any better than a mm or so...

so no correction.....     :-[


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Re: You don't need correction for everything !
« Reply #1 on: May 25, 2017, 02:27:29 PM »
I tried this a long time ago with some troublesome inductors - ISTR I had issues with multi-indexing of feeders when correction was turned off, but don't recall details.