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Topics - SteveW

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1
General SMT / Static sticks 0402s to cover tape
« on: May 30, 2018, 03:37:55 PM »
One particular reel does it about 80% of the time, and some others do it far less.
The worst reel is a Farnell Multicomp branded, so it could be any manufacturer.

If I stroke the strip before it goes into the feeder, that bit doesn't static so much - but I'm using a lot of these parts (330R resistors), so that's a faff.
I've ordered another reel, since they're hardly expensive, but it seems a shame.
Humidity is about 20%, temperature is about 30 degrees (to make the solder printer happy, not because I like it)

Any hints?

2
RV Software / Making CDFs
« on: August 09, 2016, 02:59:05 PM »
I'm slowly starting to get more adventurous with CDFs - normally I just hand place the tricky stuff, but I've got to make a few hundred of a board with a few tricky parts...
Some are going OK, but I'm stuck on this powermite diode. CDF looks sane, camera shot looks sane, x & y numbers match OK. However, Comp too big. What am I missing?

Cheers for any hints!

3
RV Software / Random rotations?
« on: January 24, 2016, 08:22:13 PM »
It's been a long and mostly successful day of placement - many boards, many thousands of parts.
Final board of the day, and the RV1S pulls this - two parts off by 180 degrees. Physically near each other, placed at very different times.

They went down straight, just off by 180 degrees. The other 4 channels of this on the same board went OK, and the other 5 of these boards went OK.

So - WTF? Did it just have a bit of a moment? Should I worry much? Fortunately, these are easy enough to spot, but if it's going to make a habit of this sort of thing...
I've had a few (maybe 5 in total) of the 'I can't be bothered to turn the vacuum pump on' component mis-picks today, which I think is more than average, but doesn't feel very related.
Anyone else seen similar weirdness? I thought I was running out of ways to be surprised by this machine.

Also, are there any cheap ways to AOI?

4
RV Software / Why won't it draw pins?
« on: November 02, 2015, 12:52:25 AM »
I'm fighting a job which a customer has given me, which uses an Altium job that duplicates many of my part names, but at random rotations. Pain in the arse, especially as it's got a wide mix of annoying parts.
Anyway, life would be easier if the preview screens would actually draw parts like I drew them in the CDF, instead of seemingly randomly picking black boxes for some parts instead, making it hard to tell if I've rigged the rotations right.
For instance, all the black boxes in the attached are SOT23, which the CDF editor reckons have 3 pins and a body.

Is it that all my hand-hacking of the cdfdata.dat file has broken something? Do you guys get sane previews?
(do the individual DAT files get used for anything?)

Cheers!

5
RV Hardware / Rotation-spotting opto device - source?
« on: June 10, 2015, 08:07:22 PM »
The transmitter side of the optocoupler thingy that spots the slot in the placer head rotation (and I assume spots the bottoming out of the nozzle) has started to fail on warm days - it goes open circuit and I can see 5V across it, rather than a volt or so when it's working.

Anyone know what it is? It's an unusual flat design that I can't find in the 250 photo-interruptors Farnell list...
(I'm sure I can bodge something up from photodevices I've got handy, but I'd rather just drop in a replacement!)

6
I'm playing with CDFs for the first time in a while, and can't remember how to do stuff...
For a start, how am I supposed to create aliases? It's greyed out in the menu, and I can't find an alternate route.

Also, anyone got ideas how to do QFNs and DFNs? Are they just tiny PLCCs? What do you do about the big white pad in the middle?

Likewise, 4-way respacks.

Although, I also can't generate any new parts. I've tried reverting to an ancient CDF file, but nothing gets better.  Can someone remind me of the bleeding obvious, before I scream?


7
RV Hardware / RV1S doing non-SMT stuff (also die bonding)
« on: December 21, 2014, 03:51:58 PM »
http://www.micross.com/process-flow-pick-and-place.aspx
There I was, looking for suppliers of bare die, since I've had a few customers sniffing around wondering if I can do bonding for LCD controllers, when I saw an old friend!

Do any of you chaps have any experience of wire bond work? A recent score on ebay means I should have a bunch of machines to play with in the new year. I'm expecting a bit of a learning curve...

8
General SMT / Source of dispensing solderpaste?
« on: May 23, 2014, 02:54:13 PM »
My Dima dotmasters are up and running - but can't dispense my standard stencilling paste. Any recommendations for a make & supplier of specifically dispensing paste? (smaller solder balls, more flux in the mix)?

Cheers

9
For Sale/Wanted, Suppliers / VSMT QSP+ on ebay
« on: December 20, 2013, 09:41:51 PM »
Interesting, I'd not seen one in the wild. XY gantry, and what looks like a PCB conveyor?
http://search.ebay.co.uk/151192522740



10
RV Hardware / Glue dot dispenser
« on: July 08, 2013, 02:15:28 PM »
A machine I just picked up has a weird feeder, that appears to be a glue dot dispenser, with a little spinning tub and what looks like a scraper bar that might set the glue height.
I'm not sure it's terribly useful looking - has anyone played with one? Any recommendations for glue? (I'm assuming something seriously heat-cured, since UV won't get under, and placing while glue times out strikes me as a bit stressful...)

Steve

11
For Sale/Wanted, Suppliers / Looking for feeders (for RV1s)
« on: November 27, 2011, 12:01:24 PM »
Hi, all.
I'm looking for some more feeders. Mostly 10x8s, but a few other sizes wouldn't go amiss.
I want to retire my ganged-tension ones (orange rubber belts, no cover-tape hold-down), since they just cause pain - if I can simply get new feeders, rather than modifying them, I'll be happy.
So, who's got what? (I have 2 machines to provision - could take up to 10 banks, but that depends on prices)

Cheers,

Steve

12
General SMT / Vapour phase reflow?
« on: July 10, 2011, 11:02:36 AM »
Gopher mentioned vapour phase in another thread - I thought it was dead & buried when CFCs got banned, but I've obviously not been paying attention.
It does sound like a good candidate for me - always small batches, always an odd mix of components, and space limited.
Does anyone here have experience?
http://www.blundell.co.uk/detail.php?id=IBL-SV260&mnuCategory=vapour%20phase%20soldering&form=4&StartLoop=0
http://www.ibl-loettechnik.de/englisch/products_sv260.html  - luxury
http://www.ibl-loettechnik.de/englisch/products_minilab.html -tiddler

Both seem convinced it's a really cheap process to buy & run, which also has an appeal... But it'll still be a substantial investment for me, however cheap they think it is, and my OK batch oven, crappy as it is, does currently do the job.

Does the fluid crud up with flux? Do the boards smell funny? How much precious fluid vanishes per use? Does the surrounding area end up with a thin layer of some freaky fluorofluid? Do any components hilariously dissolve in the stuff? (LEDs with clear lenses, f'rinstance?) Looking for the pitfalls that the manufacturers may only mention when pressed.

Ah, dammit - a search for 'homebrew vapour phase' finds
http://forums.adafruit.com/viewtopic.php?f=42&t=16085
where our hallowed forum owner asks many of the same questions :)

Steve

13
General SMT / Cleaning boards?
« on: March 22, 2011, 12:06:46 PM »
Post solder cleaning, chaps - how's best?
Does no-clean flux work?
I'm doing low enough volume that I'm probably less concerned about consumable costs than most. I just want an easy life...


14
RV Hardware / The head just wiped a load of cover tapes...
« on: March 16, 2011, 11:50:32 PM »
Just when I thought things were going well...
I've now moved to the rearmost feeder bank, and the first pick operation had the head wipe out most of the cover tapes as it went from the feeder towards the board.
How on earth am I supposed to discourage it from doing this? Should the cover tapes be routed under the front rollers? That'd be annoying (but do-able, I guess).
One step forward...

15
RV Hardware / Feeder setup - I'm confused...
« on: March 16, 2011, 12:10:08 AM »
I'm almost certainly doing something dumb here...
If I create/modify feeder units in 'job setup', by loading an existing feeder (say, 10x8mm Reel), 'make unit' named as , say, S_C_10x8.FDR (for Steves stock caps, on a 10x8 reel), then fill it with some parts from my current job, I get

*T 10x8mm Reel@

*F000 CAP_1U_16V_0603@ C0603 A000 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F001 CAP_1n_1%_0603@ C0603 A001 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F002 CAP_100N_16V_0603_X7R@ C0603 A002 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F003 CAP_10N_50V_0603_X7R_10%@ C0603 A003 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F001 CAP_10U_25V_1210@ C1210 A001 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F002 CAP_1U_0805_10%@ C0805 A002 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F003 CAP_1U_50V_1206@ C1206 A003 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F004 CAP_2N2_50V_0603_10%@ C0603 A004 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F005 CAP_4N7_50V_0603_10%@ C0603 A005 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F006 CAP_470P_50V_0603_10%@ C0603 A006 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0

Where the *F00x numbers don't count up, and I get indexes from the wrong lane.
Doing the same operation for my resistors, gets me

*T 10x8mm Reel@

*F000 R_0R0_0603@ R0603 D000 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F001 R_20R_0603_1%@ R0603 D001 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F002 R_33R_0603_1%@ R0603 D002 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F003 R_360R_0603_1%@ R0603 D003 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F004 R_1K_0603_1%@ R0603 D004 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F005 R_1K5_0603_1%@ R0603 D005 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F006 2K2@ R0603 D006 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F007 2K7@ R0603 D007 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F008 R_4K7_0603_1%@ R0603 D008 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0
*F009 R_10K_0603_1%@ R0603 D009 0 5000 500 5000 2 0 0 4 0 0 2 4 0 0 0 0 1 0 0 1000 100 0 0

which counts up fine, and works.

What am I doing wrong? Can I just hack the FDR file, or will that have 'hilarious' consequences later?

Also, what sets where feeder A, B, C, D, etc end up on the machine? Do I just set the DIP switches to match what it thinks about things?  (is it just the order they're selected?)
I'm sure there's some documentation somewhere, this stuff looks easy, but is proving tedious to keep guessing.
Finally, any hints about using what looks like a cut-strip holder that's magneted onto the bed. Is that a 'passive feeder'? It looks mighty useful - are they available to buy more of?

This is all so close to being able to do non-trivial boards, but I keep tripping up...

Cheers,

Steve

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