RE: [CAD_CAM_EDM_DRO] Robotic Arm

It's strange really that there are so many of us all been playing with mills
over the past few months, about to start PnP and reflow soldering.
I was trying to remember the manufacturers name of my oven earlier and
couldn't, it is a MADELL.
The conveyer is just a link chain job formed out of 2mm stainless wire. You
could make a jig up to fold links and assemble to do your own. The whole
thing is about 18 inch wide, and the links are probably about 2.5 inch wide,
and half an inch apart. The belt travels on rollers and each end, basically
a metal rod with several bosses on it, smooth ones in the middle and
notched, cog like ones at the side to tractor the belt along. A simple
variable speed motor drives it.
The heat elements are big bar heaters that generate a lot of heat, but do
not glow. About 6KW in all. I have thought about building one and using
fusion heater tubes from photocopiers, a photocopier also has a nice big
servo or stepper that drives the paper path that would be ideal for the
traction belt. The elements are mounted in three boxes that sit above the
PCB, each one being a heat zone, with temperature probes about an inch below
them that feed into 3 PID temperature controllers, each driving PWM into
solid state relays to drive the heaters. The inside of the boxes is all
painted with a thick hi temperature paint, and the outside insulated with
something like rockwool, tin foil, and then another rockwool and tin foil
lined box over the top of that again with fan blown air circulated between
it and the heater boxes, and out to a vent tube. Finally to standard fans
blow over the PCB as it exits.
It's so simple, and they sell for so much money over here, I might even look
at making some.
Hope that helps Jon

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 Jon Elson
Sent: 27 March 2007 18:55
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Robotic Arm

Mark Vaughan wrote:

> 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 ($).

Yup, I am planning on making a 3-zone oven for production. I am
afraid the toaster oven, with cool-down time, will not be able
to keep up with the P&P machine. I am first planning on doing
one side at a time, and the capacitors on the back are going to
go on mighty quick. Maybe 30 seconds a board.

I've already figured out a conveyor strategy, using miniature
roller chain pulled through guides on each side. I'd make
little frames to hold the boards by the edges, with bars to span
the width of the heating plates and hook onto the chain.

The commercial ovens are REALLY wide, for those huge circuit
panels the hi-volume makers use. I'd make one that could
accomodate maybe a 7" wide board. I doubt I'll ever do anything
where both dimensions are that big.

Jon


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