Building an open frame dynamo

In Another Place, I came across the idea of building an open frame dynamo based upon using an armature from a car starter motor or dynamo, casting or
fabricating an open frame and winding field coils on wooden formers by hand, perhaps utilising the copper wire already to hand from the donor device. Obviously, there would be a bit more to it than that, but you get the idea.
Bearing in mind that the cost of open frame dynamos these days is creeping ever upwards, it didn't seem like a bad idea.
Any thoughts, pitfalls, difficulties envisaged?
Regards,
Kim Siddorn
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One of these might help:-) Mike.H. http://www.edisonian.com/p009b004.htm ------------------------------------------------

or
hand,
idea.
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A smashing little book the price of which has risen on Ebay over the last two years :-) ttfn Roland

dynamo
creeping
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On Thu, 20 Jan 2005 18:48:22 -0000, "Kim Siddorn"

Why not keep the stator windings from the dynamo - maybe just use two. A fabricated and welded up frame ought to work. Could you use cheap steel for this, or would it have to be a magnetically soft iron ?
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Alyn foundry used to (perhaps still do) offer a set of castings for a Manchester type dynamo which did just that and I hope some day to convert the incomplete 'exploder' (blasting dynamo) http://community.webshots.com/photo/95271875/95272033TOvdjw which I picked up for three quid a couple of sodburys ago into a reasonably presentable under type.
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Kim Siddorn wrote:

You could base something on a car alternator. Many are reasonably open for cooling. The rotor looks the part, not that many people will see it when it's running. On that thought, all you need to concentrate on is the stator part. Does it REALLY have to work? Why not make a dummy and hide a car battery to run the lights? Am I missing the point here? It is Friday after all.
John
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The point? I like open-frame motors and dynamos & I'm aware others do too. Instead of an enclosed whirry thing, the onlooker can actually see all the components of a motor or dynamo and that makes explanations easier. It is my restless urge to add something different to a crank up other than long lines of green pumps endlessly circulating orange water, rows of lamp bulbs - many of which are not lit - and the occasional air compressor. The thing I stare at most at Bristol SEC events (for instance) is a diving pump, once used to compress air for bottles. Very interesting to watch its motions.
It ought to be possible to reproduce OF dynamos fairly cheaply using commonly available components and the news that Alyn Foundry made suitable castings is interesting.
Regards,
Kim Siddorn
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If it wasn't for the (unsurprising) monumental level of ignition interference from every engine line, I'd be tempted myself to set up an amateur radio station, powered by a small engine and generator (preferably at an end-of-line position where people could see the station in operation).

I rather liked the washing machine I saw at Barleylands, and the butter churn, which I see at quite a few rallies in the south-east.
Regards, Andrew.
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Morse?
Regards,
Kim Siddorn
"Andrew Marshall" wrote >

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taper? ttfn Roland

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I don't think so - for one, I eschew Morse, as I don't care for it at all; and for two, l doubt that Morse would be any less prone to interference unless I used modern solid-state kit with very narrow filters and a top-class noise blanker. I was thinking more of vintage all-valve gear, using Ancient Modulation on 160 or 80 metres...
Regards, Andrew.
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Andrew Marshall wrote:

One of the best Morse operators I knew would sit with the radio filters wide open, volume moderately loud and be conversing with someone whom the rest of us could only discern as a slight change in noise below several other very strong stations. He could often do this while reading the newspaper and drinking his morning coffee too [Respect].
My ears are tuned differently and I quite liked RTTY and Computer AX25 links.
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Andrew Marshall wrote:

At a time when I was in Avon RAYNET we set up on some very remote and windy hill-tops with a diesel genny on a trailer with attached tower. As I was the one who had a long wheelbase landrover I was also carrying a couple of Creed 444's with all the coaxial and other cabling required and towing the genny trailer. Lost the back door window on one trip when the top of the mast came adrift when going through a dip in rough ground.

The callsign sounds a bit familiar, I'll have to check my old logbook when I get at it again. 73's de G8XIH.
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I've not had anything to do with Pl^H^HRaynet for over thirty years now, but never heard of RTTY being used - must have been a nightmare lugging around all those teleprinters and setting 'em up.
ObSE: What was the engine on the genny; anything we'd find on the engine lines today?

Ouch! Over the years, I've seen a few tailgates explode when slammed onto just-bought-and-freshly-loaded-in furniture or other large objects in car parks. I also often wonder what would happen when a plumber's Transit fitted with one of those pipe-holding tubes on the roof comes to an unexpected sudden stop...

I don't recollect yours ATM, but may do later. Perhaps we should have 'out-of-the-way' 2m and 70cm frequencies to monitor at rallies? Say 144.725 and 432.725MHz?
73, Andrew (just south of Stevenage).
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Andrew Marshall wrote:

The engine on the Genny was quite often a Lister. The one we borrowed most was a three cylinder job with valve lifters. Hand crank for starting. It was fitted to the mast trailer as part of a motorway lighting gantry. The chap who ran the hire company was also in Raynet and so we got very good loan terms (quite a nice round figure in fact). As to the RTTY gear, the two Creed 444's fitted across the back of the Land Rover on table I built for the purpose (rested on the side-walls of the back cab). We used one for tape processing the other for on-line sending and receiving. One exercise we were involved with required a North of UK to South of UK transfer of quite a bit of dental information (as would be used in body identification). This required a number of good radio sites with RTTY capability to pass the information down (there was a lot of it and RTTY was a faster way of doing it).

Yes, a bit costly getting a new peice of laminated glass made to order. However, the new peice was in place within an hour of calling into the specialists yard. It was certainly a loud bang.

Used to frequent 70cm's quite a lot. As I said, I will have to go diving for an old logbook to look it up as it was likely 20 years back. I moved up to Oxfordshire and haven't been active on air much over the past 10 years (almost no time anymore - what with boat building, working on future energy projects and rail transport systems).
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