Bit Quiet on Here

[old-biker-uk]

Darren - That's the Picos in Northern Spain
Mark

[Bluechip]

Mark

What's the Bike ??

Panhead ??

Nice scenery, nice bike, not sure about the photographer ....   

Dave BC

[NickG]

Stew,

That reminded me of a spirograph thing too. Also, I used to have something that copied what you were drawing, I'm sure you could configure levers to give half or double scale.

Dave BC,

Funnily enough I was going to post this:



It's just down the road from BNFL, a place called Eskmeals at the back end of beyond!

[bogstandard]

It is called a pantograph, and can be obtained from most good stationers and drawing suppliers. Or off car boot sales for a quid or so.

It is a shame, because I gave a couple away early this year to a model boater who was scaling up some plans. I might have a couple left in my back room, I just don't know what is in there at this moment in time.

Bogs

[Darren]

Darren - That's the Picos in Northern Spain
Mark

You know that could so easily be down the road from my house........

[Bluechip]

Chris

This is more like a 'traditional' build.

Fairly easy.

http://physics.kenyon.edu/EarlyApparatus/Oscillations_and_Waves/Harmonographs/Harmonographs.html

In about 1974, I did some bits for a Teacher who lurked in the local pub. He did the wood bits, I made some of the metalwork, gimbals etc.
Worked fine. If you want any more info. just ask ..

Dave BC

[raynerd]

Ahh I see, this link helped: http://www.fxmtech.com/harmonog.html

So harmonographs and pintographs are both drawing machines, your inital video was a pintograph - two rotating disks, the harmonographs are the pendulum type machines.

I`m going to look into this in more detail. I bet the kids would love this and it would get some good use at science club.

[Bluechip]

Chris

I knew you'd find a site ....  I had every confidence in you 

This is from your link

http://www.karlsims.com/harmonograph/

We made one end 'swingable' in both directions, ie, a 'sperical' bearing, so you can do it with 2 pendulums.
Weights were 2 litre plastic bottles filled with wet soft builders sand, circa 4-5kg, the pen arm hinge was one of the 'polypropylene?' aileron hinges used on model aircraft.

Try an adapter to put more then one pen on, in different colours. Cute patterns.
I seem to remember spending a somewhat sozzled Saturday afternoon in Steve's garage, playing with the thing when it was up and running.

I never really grew up   

Fortunately ..

Dave BC

[old-biker-uk]

Bluechip - The bike is a WLC 45 bitsa, most of it 1942, 70s Triumph front end and a few later bits & pieces. Some pics & details here.

Re:Harmonographs, I made one once but they take up a lot of room.
If anyone wants to make a fancy drawing machine, one of these has a much smaller footprint


Mark

[Bluechip]

Mark

Really nice bike. Always admired folk who get an assortment of bits, and make a unique bike. Not easy, I think.

Make the geometric chuck yourself ?
I seem to remember a rather OTT (22 stage ?) device on the cover of ME a long time ago, when it was in the small format. '50's ?

Nice to see one ..

Dave BC

[old-biker-uk]

Bluechip - I made the chuck some years ago (seemed like a good idea at the time!) terrible time waster, you can spend hours just playing with to see what happens when you move one or other adjustment. Some details of it's construction here.
The chuck you mentioned was on the cover of ME Vol. 103 (1950)

It was a 7 part chuck built by Mr Tweddell.
It's a bitsa (like by bike!) built from a combination of Hartley/Plant & Ibbetson type mechanisms.

Mark

[Bluechip]

Mark

That's quite an achievment, it was a good idea. I doubt if many experienced model engineers would tackle one of those. Not me, that's for sure. Yup, that is the one from ME I was thinking of. So where did I get the 22 bit from ? 

As for time wasting, so what? Looking back over my life so far, a good bit of it could be described by some as 'time wasting'. But it's my time, and I've enjoyed what I do.

I expect you're the same   

Dave BC

[sbwhart]

Hi Mark lovely work. 

Thats a nice old shaper, was it origonaly hand powered then convert to motor, looks as though its had quite a few additions.

Stew