RE: [CAD_CAM_EDM_DRO] Robotic Arm

Thanks Peter
The paste is supposed to go off if it gets warm, seems strange having to
have a fridge for production really isn’t it? Less space for beer.
I was worried about it's life having to warm the pot for a few boards, this
paste is quite expensive, many many times what we pay for a reel of solder
wire. Don't think there's much in it either, maybe have to makeup a solder
grinder! to break a reel into a paste with some sort of flux and see what we
get. I'm sure the paste guys are just ripping us off.
So far we blobbed some on a pcb with a screwdriver cold, wedged some
components down and ran it through the oven just to watch it work.

Thanks again Mark

Dr. Mark Vaughan Ph'D. B.Eng. M0VAU
Managing Director
Vaughan Industries Ltd, reg in UK no 2561068
Water Care Technology Ltd, reg in UK no 4129351
Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288
RSGB DRM111(Cornwall)

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Peter Homann
Sent: 27 March 2007 12:51
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Robotic Arm

Hi Mark,

I don't have a tape hinge. I just lift the screen up from the end away from
the 2 pins, then lay it aside. I did 3 panel of 4 boards each over the
weekend. I used the paste straight out of the fridge. Seemed to work better
when a little stiff.

Cheers,

Peter.

Mark Vaughan wrote:

> Thanks Peter.
> That's about a 100 micron sheet over here in the UK.
> I did buy a proper screen printing machine for it, it has really nice
> alignment screws, and massive adjustable bearings on the stencil frame
> clamps, but the whole thing is flimsy on it's base and registration is

very

> poor.
> I was thinking of doing something like you are doing, with reg pins and a
> masking tape hinge. Easy to remove for cleaning the stencils.
>
> Thanks for input
> Regs Mark
>
> Dr. Mark Vaughan Ph'D. B.Eng. M0VAU
> Managing Director
> Vaughan Industries Ltd, reg in UK no 2561068
> Water Care Technology Ltd, reg in UK no 4129351
> Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
> Phone/Fax 44 1872 561288
> RSGB DRM111(Cornwall)
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Peter Homann
> Sent: 27 March 2007 10:34
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Robotic Arm
>
> Hi Mark,
>
> The stencil I use is 4mil mylar from http://www.smtstencil.com/
>
> When I got it made I had the 4 panel mounting holes put onto the paste

mask

> file that I sent.
>
> As the mounting holes are 3mm, I got some 3mm dowel pins and mounted 2 of
> them
> into a piece of MDF. THE PCB panel was located on the Pins, then the mylar

> stencil was then placed on the 2 pins. Perfect Alignment. I then used

spare

>
> PCBs to pack around the panel. A plastic putty spatula and some paste
> finished
> the job.
>
> Cheers,
>
> Peter.
>
> Mark Vaughan wrote:
>> Peter
>>
>> What thickness Mylar are you using for your screen print?
>>
>>
>>
>> I’ve got my machine it’s an old Dynapert 318, but with a full set of

spare

>> parts and over two hundred parts feeders.
>>
>> I also bought a full conveyer oven, which arrived about a week ago,
> customs
>> having ripped half the insulation out looking for drugs.
>>
>> Am awaiting my first batch of PCB’s for one of our marine products for a
> smt
>> run.
>>
>> The mylar film, or stainless sheet laser cutting have all now given loads
> of
>> options, but have very little advice.
>>
>> One of the US dealers has dropped the price of their Chinese conveyer
> ovens
>> from $10,000 to about a quarter of that. It has three heating zones, and

a

>> big set of fans to cool the parts.
>>
>> Actually the oven would be the easiest thing to make, they say it’s all
> very
>> hi tech, but as you know from your delonghi the technology is minimal. My
>> conveyer oven does have a few safety issues, like the plug to the fans is
> a
>> microphone connector with 240V on it, and live pins. My only complaint is
>> the gap isn’t high enough to get a pizza through.
>>
>> I looked at an oven on ebay the other day, it went for £20, I was very
>> tempted until I discovered it was 5m long, 3m wide and draws 50 amps on
> each
>> of three phases. But for others that are interested there are box table
> top
>> ovens for sale from China starting at around a thousand bucks ($).
>>
>>
>>
>> Regs Mark
>>
>>
>>
>> Dr. Mark Vaughan Ph'D. B.Eng. M0VAU
>>
>> Managing Director
>>
>> Vaughan Industries Ltd, reg in UK no 2561068
>>
>> Water Care Technology Ltd, reg in UK no 4129351
>>
>> Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
>> Phone/Fax 44 1872 561288
>>
>> RSGB DRM111(Cornwall)
>>
>> _____
>>
>> From: CAD_CAM_EDM_DRO@yahoogroups.com
>> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Peter Homann
>> Sent: 27 March 2007 06:36
>> To: CAD_CAM_EDM_DRO@yahoogroups.com
>> Subject: Re: [CAD_CAM_EDM_DRO] Robotic Arm
>>
>>
>>
>> Hi Jon,
>>
>> See below.
>>
>> Jon Elson wrote:
>>> Peter Homann wrote:
>>>> Hi Jon,
>>>>
>>>> Good choice. I received my Pick and place machine a couple of weeks

ago.

>>>> It is a Yamaha YM-84, commonly known in the USA as a Philips CSM-84.
>>>>
>>>> It came with about 50 feedersas well. I've already run out of feeder
>>>> slots
>>>> on the machine. It has 3 heads (0.7mm, 2mm and one about 4-5mm. It also
>>>> has a pneumatic centering station plus an upwards looking centering
>>>> vision
>>>> camera. Plus a tray freeder
>>>>
>>>> Ran off a handful of ModIO panels and a DigiSpeed panel over the
>>>> weekend.
>>>> It's quite a fun machine to use.
>>>>
>>>> One of the thinks I need to make is a number of waffle trays to hold
>>>> various components. One of them is the power inductor for the ModIO
>>>> power
>>>> supply. I purchase a part reel without the reel and the tape is all
>>>> cracked up. Iplan to use some 4mm perspex to mill an array of pockets

to

>>>> suit the inductor. I'll draw it up in Autocad and use sheetcam to do

the

>>>> nesting array and produce the G-Code.
>>>>
>>>> I've had a days training on it, and it is now productive.
>>> Great! I was worried that there was a malfuction, but I just
>>> had to manually crank the axes into the center of the workspace
>>> and then the error condition cleared up.
>>>
>>> I have a lot to learn on how the board conveyor and work stops
>>> are supposed to be used. I don't think it would take too long
>>> to get it placing parts, but I don't have any facility for
>>> applying the solder paste or reflowing the boards, yet.
>> The machine comes with a pendant that controls the menu on the RH screen.
>> The interface is primitive and similar to a Nokia phone text interface.

It

>> hakes a while to get used to but is consistant.
>>
>> Do you have a manual with it? If you have questions I can answer them to
>> the best of my limited knowledge.
>>
>>> What are you doing for that?
>> I use a mylar laser cut stencil for applying paste. I also have a
>> pnuematic paste despenser as well.
>>
>> For reflowing I use a fanforced toaster oven that I made a temperature
>> controller for.
>>
>>> I see a solder paste dispenser is available, but this machine
>>> didn't come with one. (I still have to go through all the boxes
>>> of extra stuff, there could be one in there.)
>> I was told that many have tried unsuccessfully to get the despenser to
>> apply paste. It should only be used for adhesive.
>>
>>> Thanks,
>>>
>>> Jon
>>>
>>>
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