Member postings for Sam Stones

Thanks to John McNamara mentioning it some weeks ago (and my not-very-reliable-memory), there's an exhibition south east of Melbourne this weekend.

Here are the details ...

**LINK**

Health permitting, I aim to give it a go.

Here's wishing them well,

Sam

Edited By Sam Stones on 03/10/2018 22:24:01

My 'Tongue-in-cheek' are getting worser by the minute, Murray.

Sam

And then there are those super capacitors

**LINK**

https://www.youtube.com/watch?v=weRVZg_DEDs&t=0s&list=UUmHvGf00GDuPYG9DZqQKd9A&index=58

Sam

Ah! Now the penny drops.

To think I’ve been posting here since 2010, and never gave that a thought. Thanks Jason.

To those who haven’t, how about a few lines for your profile?

Regards to all,

Sam

Thanks for your reply Bandersnatch.

Sorry for the confusion, I'm really talking about those I sent. None, I might add, were of an urgent nature.

However, with several PMs remaining in my 'Sent' box marked 'Unread', perhaps I should first alert the recipient in the M.E. public domain!?

Of course it's the recipients choice to ignore/delete.

Just wondering.

Regards,

Sam

Having sent a few PMs recently, do you automatically delete as S-PAM when you get one of these in your email?

New Private Message Received From Model Engineer

noreply @ model-engineer.co.uk

Sent: …………..

To: ………………

…………………………………………………………………………………………

You have a new message waiting, subject … XXXXXXXXXX XXXXX

Go to message centre to view.

Here's an extract from **LINK**

The flame is not self-extinguishing, shows little to no smoke, and the blue flame can be almost invisible in ambient light. Burning also releases formaldehyde gas, which irritates nose, throat, and eye tissues.

Enough said?

Sam

Another chilly morning in Melbourne

[another POM = polyoximethylene = polyacetal = acetal = Delrin]

WARNING!

Re: Swarf, Mostly's contribution meant to be helpful:

Regarding plastic identification - Delrin (acetal) burns with an INVISIBLE flame.

With the greatest of respect for Swarf, Mostly! ...

But ..., whatever you do, DO NOT SNIFF THE FUMES!

Desk-top identification of plastics by burning (and sniffing), places polyactetal (Delrin) at the top of the DON'T DO list.

If you do, you'll never forget it.

Good luck with the rollers.

Sam

For better creep resistance, I would go along with filled polyacetal ... BUT ... machining glass-filled materials can give rise to issues where micro-fragments of glass can break away from the resin component and get under slideways.

While machining a bar of glass bead filled something or other, in an instant, my ML7 (Myford) saddle locked solid when glass beads found their way under it.

It required a total strip down and a thorough cleaning of the saddle and lathe bed.

Given the choice of colour, black usually offers more UV protection.

Although I'm like the idea of plastics, why not stainless steel?

Sam

As an after thought: wouldn't 'exposed' glass in the machined bore chew into the shaft?

Edited By Sam Stones on 28/09/2018 05:24:41

I thought so too, Michael.

My apologies to Dave C, for not being all that helpful.

Sam.

Sunshine in Melbourne for a change.

I can’t be sure of the story that James Watt checked piston to cylinder clearance with the thickness of a gold (half?) sovereign.

However, years ago at a model engineer club meeting near Melbourne, one old chap declared …

“I don’t know about all this tolerance stuff."

"When I was a lad, we had to get it right.”

Neil,

Has that got something to do with the ghosting, contrast variation, and incorrect position or absence of shadows?

I think the 35 is sitting on top of the carbon fibre reinforced flagpoles.

Anyway, it’s dammed good model making.

Sam

George (mechman48) ... I sent you a PM.

Regards,

Sam

My two penn’orth goes like this …

Up north t’other side of Manchester we called the greasy blue stuff ‘bedding blue’. (Nothing to do with nuptial discord.)

On page 2 of this thread (about five years back) I related a story that went like this …

When an apprentice was learning to read a Vernier [scale], bedding blue was often [discreetly] smeared inside a doll’s eye magnifier for the unsuspecting learner.

Getting them to change eyes for a better look brought on more laughter. If you haven't seen a doll's eye magnifier (jeweller's loupe), they look like this.

‘Marking out blue’ is commonly used as a very quick reference by Chris of **LINK** especially when he is setting shoulder lengths on the lathe. However, as can often be seen, marking out blue will flake and rub off quite readily.

For extremely fine, close up work, toolmakers in my apprenticeship era would apply copper sulphate to steel. It allowed a much sharper scribed line and, although less clear than marking out blue, the copper coating didn’t rub off easily.

Sam

Yesterday, Michael Gilligan wrote ...

I used a small "toolmaker's clamp" [as distinct from a "small toolmaker's" clamp], which worked quite nicely.

Michael, I could easily have been one of those small toolmakers.

Except that I grew to a mid-range height of 5’-7¼"

Those photographs are great, and explain all that's needed.

Sam

How about a photograph to let us in on the secret?

Sam

In chilly Melbourne.

Never having seen silver steel in flat sections (as suggested by Ronan), and no idea of how the spring is situated/fixed, I question if round wire could be used instead, i.e. piano wire available through model shops.

For the cross section which Leszek nominated, assuming the spring thickness is 0.044" and 0.094" is the width, my equivalent (moment of inertia) calculations suggest that a wire diameter of 0.061" is about right.

This was my 'change-of-direction' when I chose (calculated) 0.008" diameter guitar wire for the balance wheel spring of my clock, instead of the nominated flat wire 0.020" x 0.005".

Other than annealing for sharp bends, heat treat may be unnecessary.

Sam

Michael,

I wonder if this is a useful starting point ...

THE LONDON GAZETTE, 3RD JULY 1959

Name of Company: E. F. GARTHWAITE & SON LIMITED. Nature of Business: MACHINE TOOL MAKERS. Address of Registered Office: 42 Bedford Avenue, London W.C.I. ' Liquidator's Name and Address: Reginald Hugh Jenkins, 9 Bedford Square, London W.C.I. Date of Appointment: 26th June 1959. By whom Appointed: Members. (039)

Extracted from

**LINK**

Sam

An excellent link, Martin; very descriptive.

And yes XD 351, humour intended, with optimism for a bunch of sparkling responses.

Sam

Only jokin' Michael