Andy, Several years ago I got one from a maker of medical pumps
and the volume was too small. I think a large one could be made
to move a larger volume and that would work. You would need a
much larger hose.
Derward KD5WWI
----- Original Message -----
From: Andrew Volk
To: Homebrew_PCBs@yahoogroups.com
Sent: Wednesday, August 22, 2012 12:27 AM
Subject: RE: [Homebrew_PCBs] Magnetic drive pumps for spray etchers
Has anyone looked at peristaltic pumps? The only thing that comes in
contact to the etchant is the rubber hose that goes through the pump. I got
one off of eBay, as well. The only issue with this kind of pump or the less
expensive pumps in this thread is the volume they can push.
Andy
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Robin Whittle
Sent: Tuesday, August 21, 2012 9:03 PM
To: Homebrew_PCBs@yahoogroups.com
Cc: Ben L
Subject: [Homebrew_PCBs] Magnetic drive pumps for spray etchers
From the thread: "Kepro bench top spray etcher":
An eBay search for:
magnetic pump
produces hundreds of results, some of them for small pumps costing less
than $100. Sorting by "price with shipping" groups similar products
together.
Perhaps not every one of them has a magnetically coupled impeller -
thereby presumably having no metal shaft or seals which could be
attacked the the etchant. Maybe some of these are truly magnetically
coupled, with an impeller magnet totally sealed in plastic, and with
enough pressure to drive spray nozzles.
I think the challenge is to find one or more to make a compact
double-sided spray arrangement, with a smallish amount of etchant.
Prices are USD$ with shipping to Australia.
. http://www.ebay.com/itm/221017721016 $27
. Anti corrosion. 5 litres per minute.
. http://www.ebay.com/itm/221109440478 $20
. Probably too small.
. http://www.ebay.com/itm/270961751604 $25
. Probably too small, but has photos of the magnetic drive system.
. http://www.ebay.com/itm/130481962264 $21
. Another small cheapie - photo shows magnetic drive system.
. http://www.ebay.com/itm/180947111931 $30 + $53 shipping
. Iwaki 100V AC induction motor, uses a capacitor to phase lag the
. second winding. Is the capacitor internal or external?. From a
. photographic processing machine. 6 available.
. At 50Hz, 11 litres/min. Max head 1.5 metres.
. http://www.ebay.com/itm/180955597871 $70 + $80 shipping
. Larger Iwaki pump, one only. 27 litres/min 3.1 metre max head.
. This would be be highly suitable.
. http://www.ebay.com/itm/180954727143 $90 + $135
. Larger Iwaki pump.
. http://www.ebay.com/itm/130681739875 $50 + $51
. Iwaki-Walchem New Old Stock. 220VAC high capacity.
. http://www.ebay.com/itm/130743582615 $83
. High capacity 24 volt with speed control. This is a brushless
. motor, meaning it has electronics to drive three (I guess)
. windings, with a permanent magnet rotor which follows the resultant
. rotating magnetic field. The rotor's shaft is ceramic. So I think
. there is no motor -> magentic coupler, just that the permanent magnet
. rotor and its shaft and bearings can be exposed to liquids without
. being damaged. Many sellers have this item.
The above pumps are centrifugal.
This one is dual interlocking gears, which I think might be better for
producing higher pressures for the restricted flow of a spray system:
. http://www.ebay.com/itm/280929962685? $11
. It is quite small, but if it really is immune to corrosion, then
. two or more could be used, since they are so inexpensive.
. Multiple sellers have the same item.
. http://www.ebay.com/itm/250810139654 $29 + $43
. Another gear pump, with no motor. The pipe fittings could be tricky.
. Up to half a litre per minute, which is rather small. Maximum
. pressure is 75 pounds per square inch, which is very high.
Searching now on:
Iwaki pump
. http://www.ebay.com/itm/350587388542 $25 + $47
. One only, Iwaki bellows pump 220VAC.
. http://www.ebay.com/itm/140813153579 $90 + $48
. Extra high pressure Iwaki pump with magnetic coupling arrangement
. clearly shown in photos. Comes with useful-looking hose fittings.
There are many more Iwaki magnetically coupled pumps costing more than
$100. I guess there are lots of now-obsolete photographic processing
systems being broken up for parts.
- Robin http://www.firstpr.com.au/pcb-diy/
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]