Member postings for Sam Stones

As I duck for cover David (Colwill), I must offer a correction.

Other than keeping an eye on and reporting Clickspring Chris’s wonderful work (not only his approach to building the Antikythera), my involvement is purely as a spectator.

Credit must go to others, Michael in particular.

Sam

Edited By Sam Stones on 13/03/2021 21:19:12

Please excuse my lassitude Michael.

Regrettably, laziness on my part seems of late to have become an undesirable complication .

Sam

PS Your guidance is always welcome.

Edited By Sam Stones on 13/03/2021 01:03:27

Apologies to previous thread authors, I could have taken a bit more time to provide these links ...

**LINK**

Sam

I feel sure DaveD, that you’ll have come across the superb series of videos from Chris of Clicksprings ...

**LINK**

If not, take a visit if only for his quality of workmanship and presentation.

Here in particular is the first of his ten Antikythera episodes ...

The Antikythera Mechanism Episode 1 - Greeks, Clocks and Rockets.

**LINK**

Then there is this book which Chris mentions …

‘Gears from the Greeks’

The Antikythera Mechanism--A Calendar Computer from CA. 80 B.C.

by Derek De Solla Price

**LINK**

I don't think you'll be disappointed.

Cheers,

Sam

Thanks for your help Jason and for your near instant rendering.

At this stage John, the mandrel will exist in CAD only. It is even becoming more appropriate to design the whole mandrel from scratch.

Thanks for your interest.

Sam

Edited By Sam Stones on 05/03/2021 22:35:25

That's a great starting point Jason.

I wasn't all that clear in explaining that the holder/chuck will be bored out (from the rear) to a plain internal diameter ready for shrinking onto the partly prepared mandrel blank.

Thank for your prompt reply.

Sam

Edited By Sam Stones on 04/03/2021 21:29:18

One of the (cool) ‘delights’ of CAD is having access to the myriad of free 3D (part) files, both from manufacturers and individuals.

An albeit brief Internet scan has failed to locate what I’m looking for. Either I’m using the wrong keywords, or perhaps the files don’t exist.

I’d like to draw up (in CAD) a basic lathe mandrel featuring the `adaptation' of an ER (32) collet chuck with internal thread; it would be the type that normally screws onto the nose of a lathe mandrel.

The dimensions of the internal thread are unimportant since the thread will be ‘machined’ away (in CAD).

Can anyone please guide me to a free 3D CAD file for an ER 32 collet head/chuck/holder (with nut)?

For continuity, here's Clay's thread ...

**LINK**

Many thanks for any help.

Sam

Melbourne - Getting cooler

Now you’re talking Dave, small glass bottles with fire inside. The ones with carbon anodes were not so small.

They were ‘Pick-n-Place’ too.

You picked the one where the fire had gone out, and put another in its place.

I’d better ‘getter’ out of here quick.

Sam

And then there's the light bulb that is voice activated via an app on your phone.

Here, Julian breaks one apart ...

**LINK**

I loved the one about a toothbrush that has Bluetooth.

Sam

Getting further away from the thread, with apologies to Neil, over a weekend around Xmas 1939-40, as a result of a very heavy snowfall, the public transport services in Bolton were brought to a complete standstill.

It was essential however, for WWII munitions to continue especially at De Havilland and the Loco Works near Horwich.

On the Monday morning, in their haste to clear the snow from the tramways between Horwich and Bolton, the Bolton office urged the Horwich crew to start snow clearance of the left hand track. The Bolton crew would meet them somewhere halfway. By Wednesday, both crews had made good progress.

Needless to say, they didn’t actually meet in the middle as planned. Only the left hand tracks had been cleared.

Sam

Also in the 60’s Bill, my first vehicle was a Morris minivan. By the late 60’s I got really posh and bought a neighbour’s Ford Anglia. Neither were garaged so winter starts in the north of England could be a bit exasperating.

However, I learned something you can’t do on modern cars.

Parking the vehicle for the night while the engine was still hot and running, the trick was to pull the choke at the same time as turning off the ignition.

It hardly ever failed to produce an instant start the following morning.

Sam

PS Cold starts have never caused me a problem where I now live.

I’m just being mischievous Steve.

To add to my tomfoolery … with the engine already the right colour, each carriage could carry a ton of Tesla’s too!

Where there is no overhead supply, the batteries could be inductively charged from magnets between the rails, while regenerative braking would be a spin-off.

Not very efficient I'd guess, but who cares about efficiency anymore?

OK, I’m going.

Sam

It might be more fashionable to replace those diesel engines with a cluster or two of Tesla batteries.

Just turn a switch and away you go.

Sam

Wash your mouth Sam !!!

Edited By Sam Stones on 17/02/2021 02:44:45

If you backtrack through his extensive list of videos, you’ll find that Big Clive has uncovered dozens of faulty products such as this.

It’s just one of the things he does, and he does it well.

Who should be held responsible?

Sam

Edited By Sam Stones on 02/02/2021 00:29:02

The pitch was musical after all, Nigel.

Sam

A fascinating subject, Michael.

For a few brief moments when I saw your subject title, my mind switched from musical pitch to thread pitch before ….. well here’s my contribution.

In light of pitch’s (historic) use as the thermoplastic (resin) component in dough moulding compounds, pitch is actually extremely brittle at room temperature. [I can’t find its Tg, can you Nick?]

Pitch was stored in large pieces outside at the plastics factory where I began work (1950). Some pieces were as large as footballs. Along with fillers of various kinds, it was steam-heated in ‘Z’ blenders. The fillers provided a support matrix not unlike glass reinforced resin.

In the northern reaches of England on those rare occasions when the sun shone through, the stored lumps of pitch could be heard snapping and tinkling as it/they responded to the changes of surface temperature.

Sam

Edited By Sam Stones on 07/01/2021 21:09:13

At about 1:50 into this video, Clive mentions 'side emitting' LED's

Does that help?

**LINK**

Keep safe,

Sam

Duncan,

Try dimpling the end of an LED with a drill point, thus forming a conical concave. It should spread the light sideways.

I think Big Clive **LINK** mentions that they are available (in that form) over the counter. However, without wading through his many videos I can't say where.

Cheers,

Sam

Not much direct help John, but this home-made taper turning attachment came with my second hand lathe back in the 60's.

The original owner had used a piece of angle iron to bolt to the four 1/4" BSF screw holes in the back face of the ML7.

Although I only used it once to its full extent for machining some stainless steel coffee table legs, I adapted it as a cam system while machining (and grooving) a brass fusee for my (John Stevens) skeleton clock.

Regards,

Sam

Many thanks to Peter, Paul, Robin, and Nigel B, your combined responses and links have led me to realise that M42 is the nomenclature for a version of high speed steel (HSS).

It wasn’t, as I was first trying to determine - a metric ‘something-or-other’ or perhaps some percentage-combination of chemical composition, e.g. 18-8 stainless steel.

I particularly find the Lenox **LINK** most valuable, especially their diagrams of shear-plane angles and swarf formation. The video mentioned by Robin is also worth a look.

To a limited degree, I shall be addressing M42 hidden within a subsequent post.

I don't expect to do that for some time yet.

Incidentally, did you spot the Achilles heel?

Regards,

Sam

Edited By Sam Stones on 29/11/2020 00:34:03