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Member postings for Sam Stones

Here is a list of all the postings Sam Stones has made in our forums. Click on a thread name to jump to the thread.

Thread: Macro-photography
07/04/2021 22:00:45

Hi Nick,

That’s a very pleasing result.

Going (viewing) cross-eyed, your efforts put a big smile on my face.

Then, just as I was about to send a congratulatory note, your follow-up post with technique description appeared and my smile turned into a grin.

As can be expected, out-of-register reflections from the glazing seem to cause the brain to switch between eyes producing a twinkling effect. This was discussed earlier, see Page 11 - 23th May 2020.

Sam smile d

05/04/2021 22:45:15

Jack, the moment I saw those front legs I had little doubt it was a mole cricket.

Back in Nicosia ’57-8, another chap in our camp had found one and was holding it gingerly between his finger and thumb inside a piece of rag. He claimed that its digging strength was so strong he could hardly stop it from moving.

The same chap had previously demonstrated his ‘ability’ to hand-feed flies to a praying mantis he kept as a pet. It chomped away as if eating a piece of watermelon, making no effort to escape.

Sam smile d

05/04/2021 22:41:06

Nick, I’d like to suggest that your fridge magnet would make a good subject for a stereo pair. Would you care to have a go?

Sitting on say BluTack, tilting it left to right a few degrees might be all that’s required. cheeky

Sam smile d

Thread: The Moon
04/04/2021 21:52:17

Many thanks for the link Michael.

All became clear when the penny dropped. [Mixed metaphor?]

I could relax except to ask -

“Neil, Why is your picture just a blank?”

Sam smile d

04/04/2021 01:28:52

On second thoughts, are we talking about removing haze shimmer?

Any positive comment would be appreciated

Sam smile d

04/04/2021 01:13:09

Can someone provide images of before and after photo-stacking of the moon (or any other astronomical subject)?

I'm struggling with DOF and its relationship to the distance ratio of subject to distance of 215:1 (i.e. the moon's distance of 373,586 km divided by half the moon's diameter of 1735 km).

Or am I barking up the wrong ratio tree ?

Should I presume we are not talking about focus stacking?

Sam smile d

02/04/2021 03:25:09

What a brilliant camera/lens combination Steve.

Looking forward to seeing more of your impressive photography.

Sam smile d

Thread: Gravity and Weightlessnes
18/03/2021 19:37:37

Michael, In not grasping the implications of 'Cookie Settings', I wasn't game enough to include the second part of the sentence.

Jim, I must take this opportunity to acknowledge the many stories in your website **LINK**

swarfology.com.

Most entertaining and very much to the point.

Cheers,

Sam smile d

18/03/2021 18:30:49

Thanks for the link Michael. What bothers my simple mind is ...

The modules occupy an area of 17,657 cubic feet,

Sam

Thread: Antikythera solved ?
13/03/2021 21:18:07

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.

Samsmile d

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

13/03/2021 00:59:37

Please excuse my lassitude Michael.

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

Sam embarrassed

PS Your guidance is always welcome.

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

12/03/2021 23:45:18

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

**LINK**

Samfrown

12/03/2021 23:19:29

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

Thread: Free 3D CAD files (ER Collets)
05/03/2021 22:29:40

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.

Samsmile d

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

04/03/2021 21:28:22

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.

Samsmile d

 

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

04/03/2021 20:49:40

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.

Samsmile d

Melbourne - Getting cooler

Thread: Skynet is Coming
24/02/2021 18:58:29

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.

Samsmile d

21/02/2021 00:48:22

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.

Samsmile d

Thread: You think you have trouble starting your car on a cold morning?
19/02/2021 21:20:05

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 smile d

19/02/2021 19:33:14

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 smile d

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

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