Chuffing Jenny

My junk assemblies never benefit from design, I simply cobble together whatever random items I come across that might be adapted to perform some vague engine function. Chuffing Jenny is the latest arrival – from brass candlesticks to a chuffing little engine that lights its own way…

The full story is under the ‘Engines’ tab…

Click here for more photos, videos and the whole story…

Workshop (I mean studio!)

It seems every model maker wants a Myford lathe. I have no time for those prissy excuses for a machine tool but then you may have noticed I don’t make models and anyway I needed something a bit bigger to satisfy my aspirations. A Myford is a 3.5 inch lathe which means the maximum diameter you can turn is 7 inches (150mm!) and that’s really beyond its capability.

For my general purpose projects I looked round for something with a decent capacity even if a bit weak and came across a Chester Centurion lathe/milling machine combination. I didn’t trust this obvious cheap import, it looked a bit ridiculous in fact and I dismissed it as a non-starter until I spoke to Ian, a fine craftsman from the past. He had one and reckoned it was OK providing you don’t expect too much… and he was right.
It has a centre height of over 8 inches!! – I could turn a 16 inch flywheel. Oh yeah?

The slowest speed on the Centurion lathe is far too fast to turn anywhere near 16 inches, in fact when I needed to machine this sort of diameter I resorted to pulling the chuck round by hand. A bit of a fag but I got there.
The lathe comes with a 3 jaw self centering chuck. They never run true after a bit of use and can’t hold rectangular materials (remind me to tell you about Tank Lee 🙂)
and do not have a really tight grip.
Instead I opted for a good size 4 jaw independent chuck and have used it successfully for all my work regardless of the need to ‘clock up’ every time. It holds tight and perfectly true. Model makers use 3 jaws!

Musings late 2020

Opting to use compressed air in place of steam has freed me from safety concerns but it’s painting with water colour rather than oils. Although it’s less dramatic lacking the heat and smell, all the engines still have full steam propulsion capability.
Tin Pan Ali has a fake boiler and I don’t mind, in fact it’s closer to my original thinking of assembling interesting junk with a common theme.
The advent of CNC around 1980 heralded big changes in the design and construction of machine tools and one important improvement was the incorporation of ball screws and linear ball tracks, practically eliminating the backlash present in all leadscrews and vastly reducing the friction in close fitting slideways. They are amazing and I just had to somehow work a couple of ball tracks into the ‘Tin Pan Ali’ engine.
Note the sliding bar…

Moving on into 2021
I’ve found a vintage hand drill with an interesting gearbox in my collection of old tools. It’s crying out to become the heart of a great 2021 project!

And this is where I log my thoughts?

This covid lock down has ended my supply of car boot sale junk and I’ve run out of utilisable stuff in the workshop and rusting in the garden. Ebay has been a life saver but good wampum (beads and shiny things used to trade with natives) is costly.

This week I ordered a new cast iron cooking pan to use upside down as the base for the engine in progress.

I miss Bryn Hynog farm it was a treasure trove of amazing junk and Bryn was always keen to find bits for me, when I needed some round steel he wagged up with a tempered steel lorry half shaft. Tough to machine! when we left Wales I traded rust and mud for stainless and salty water.

It’s tempting to use more modern metals despite my preferring good old fashioned mild steel. Decent chunks are not easily found and I keep an eye out for anything that can be repurposed, In desperation I once made a pulley out of a sledge hammer head.

Rubbish skips are always a great source of interesting items and I find it difficult to keep out of some.

Continue reading “And this is where I log my thoughts?”