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Member postings for Swarf, Mostly!

Here is a list of all the postings Swarf, Mostly! has made in our forums. Click on a thread name to jump to the thread.

Thread: DC Treadmill Motor
20/05/2019 10:56:55
Posted by Andrew Johnston on 17/05/2019 16:20:56:

In addition 48V is a standard industrial distribution voltage within automation cabinets and the like, as well as for power over Ethernet units. The problem with 60V is that it is at the SELV voltage, so regulations get rather more onerous.

Andrew

Added for historical interest: I believe that 48 Volts was also the voltage of the battery supply used by the old Strowger telephone exchange equipment. Lead-acid cells in glass tanks large enough to fall into!!!

Best regards,

Swarf, Mostly!

Thread: Warrington Model Engineering Developments
20/05/2019 09:01:21

I have adjustable dials on the feed-screws for my ML7 cross-slide, top-slide and both vertical slides. At least two of those were bought from WMED. The other two were bought from eBay sellers but could have been made by WMED.

Best regards,

Swarf, Mostly!

Thread: Source of Machined Nuts
19/05/2019 14:46:36

Andrew,

Thank you for your very full response to my suggestion.

Best regards,

Swarf, Mostly!

17/05/2019 20:58:30

Andrew,

Do I remember rightly that you have a dedicated repetition lathe? It might interest some members to recap on such a machine's capabilities?

Best regards,

Swarf, Mostly!

Thread: Myford ML7 - Size of Mandrel Through Drilling?
10/05/2019 11:17:47

Hi there,all,

I've recently had a gentle disagreement with someone about the diameter of the through drilling in the mandrel of the Myford ML7 lathe (i.e. the back end). Well, not so much about the diameter as about it's consistency, lathe to lathe. This dimension is of interest in connection with mandrel handles or depth stops and, more loosely, with draw-bars or bumper bars.

The published specification for the ML7 states that the through drilling is 19/32". (The same figure is given for the Super Seven. ) Please note, I'm not 'talking' here about 'big bore' or similar machines.

Please may I use this thread to take a 'straw poll' from ML7 owning members, requesting them to post the size of the through drilling of their ML7 mandrel, together with their machine serial number?

Thanks and best regards,

Swarf, Mostly!

Thread: 2mt Myford Collet
01/05/2019 08:56:20
Posted by roy entwistle on 01/05/2019 08:39:32:

Neil All due respects but do you realise how thin the walls of that would be ?

Roy

Sounds like a wrapping of shim-stock to me!

Best regards,

Swarf, Mostly!

Thread: Removing a grub screw
15/04/2019 16:11:59

Hi there, Harry,

I agree with Brian about 'EasyOuts' - they can expand the bolt and make things worse.

My preferred method is to use a left-hand drill. It will centre well enough in your socket grub screw and, eventually, bite and wind out the screw.

I believe there are a few videos on YouTube.

As well as the simple left-hand twist drill, you can get a screw remover that has the same shaped tip.

Best regards,

Swarf, Mostly!

Thread: What Did You Do Today 2019
11/04/2019 20:05:17
Posted by martin perman on 11/04/2019 18:39:27:

SNIP!

... I struggled to carry my end, so put it down for a moment where upon my neighbour, 30 years my junior, picked it up stuck it on his shoulder and carried it to my yard, oh to be young again.

Martin P

My stepson did something similar with a railway sleeper (actually, five * railway sleepers! ). Five years later, he had a spell in hospital for neck surgery. Might just be a coincidence?

* One at a time.

Best regards,

Swarf, Mostly!

09/03/2019 20:50:26
Posted by Limpet on 09/03/2019 19:54:31:

20190220_154845.jpg

Not just today but last week acquired this ML7, it needed a little TLC

20190309_113702.jpg

It's now in a lot of bits - anyone know how it goes together

Go to the Myford web-site and click on ML7. You will be presented with links to several pages, one for each of the major sub-assemblies of the ML7. Chose one. Scroll down until you reach 'Exploded Parts Diagram' and then click on 'View Page'. You will then be able to download (aka 'save as' ) the Parts List and the exploded diagram. Go back and choose the next sub-assembly of interest, 'rinse and repeat'.

Best regards,

Swarf, Mostly!

Thread: Workshop - indoors or outdoors
26/02/2019 13:30:41

If it were me, I'd research the local geology before committing to the cellar. What is the local sub-soil and at what level is the water table during the wet season?

'Tanking' has been mentioned - I'm sceptical about the efficacy of tanking on the inside of walls & floor, the water pressure from outside can push it off.

Back in the late 1800s & early 1900s houses in some districts were built with 'stock' bricks which are porous. The walls were often built with no damp-proof course but with air bricks and a large ventilated space was left beneath the lowest habitable floor. While there were often pipes and cables down there, it wasn't intended as a cellar. The idea was that damp rising up the walls by capillary action would evaporate from the surfaces of the brickwork and be removed by the ventilation in preference to proceeding further up the walls to the inhabited floors of the house.

A friend of mine was helping clear the cellar workshop of a deceased neighbour. It seemed to be dry. He encountered a piece of paper into which had been inserted several very small (e.g. #61 - #80 ) twist drills, as is often done with sewing machine needles. Over time the paper had acquired enough moisture to completely rust through the drills at the points of contact!

Best regards,

Swarf, Mostly!

Edited By Swarf, Mostly! on 26/02/2019 13:33:09

Edited By Swarf, Mostly! on 26/02/2019 13:33:39

Thread: Tauco drill press
08/02/2019 16:59:27

Posted by SillyOldDuffer on 08/02/2019 10:31:55:

SNIP!

Watching those telly programmes about restorations is even more surprising; if rebuilding a Sherman Tank, it seems possible to get new turret rings.

Dave

Off Topic but here goes:

Back in 1969 I needed a 28 Volt dynamo for a project. Watson's Eastern Motors (a long-time ME advertiser) was listing the 'Type O Engine-driven generator, 28 Volts DC 1500 Watts'. (I'm relying on memory there. ) So I drove out to Aldeburgh and stated my requirements. 'Oh, we don't keep them here. Let's go the the other store' was the reply. The 'other store' proved to be a bungalow some distance from the main shop. I was ushered into one of the rooms whose walls were lined, floor to ceiling, with cardboard boxes each containing a Type O and addressed to the CO of some RAF Station. The labels all said 'Rotax'. I purchased a few for my requirement.

Some time later I heard that the proprietor of Watson's Eastern Motors had died and the succeeding proprietors were more interested in house clearance. I still wonder what happened to all those Type Os. I later donated two of the ones I had bought but not used to a restoration group at Duxford.

The type O was one member of a family of aircraft dynamos that had a standardised interface to the aircraft engine gearbox via a splined shaft and a flexible coupling. I wonder whether that equipment practice is still used today?. Some (most? ) were 28 Volts but the family had 12 Volt members. Each type letter denoted a different power rating,

Best regards,

Swarf, Mostly!

Thread: One off castings
08/02/2019 16:39:47

Stephen,

I believe that Stuart Turner are now at the Bridport Foundry.

Best regards,

Swarf, Mostly!

Thread: Tauco drill press
08/02/2019 09:49:40

Hi there, Alan,

I wonder if Wilkinsons provided you with a copy of this:

tauco spares list #001m.jpg

My Tauco has a female spline in the upper spindle extension and a die-cast component with the male spline that sits within the pulley. This die-cast piece doesn't show very clearly in the diagram! When I acquired mine, the male spline had worn paper-thin but I was able to obtain a replacement from Wilkinsons.

Best regards,

Swarf, Mostly!

Thread: Microphone Screw Threads
31/01/2019 10:38:08

Sorry, I quoted AJW but I actually intended to quote Chris Trice.

Best regards,

Swarf, Mostly!

31/01/2019 10:36:05
Posted by AJW on 31/01/2019 09:28:17:
I've always used 1/4 whitworth for all my tripod fittings? Always worked!

Alan

I believe that UNC and UNF threads are NATO-ised versions of ANC and ANF respectively, the 'U' standing for 'unified'.

The threads on authentic (e.g. Amphenol ) UHF and N-type coaxial connectors were/are 5/8" by 26 tpi ANEF but there are some Far-eastern made connectors on the market with 5/8" by 1 mm pitch threads. Some mate - some don't!!!!

Best regards,

Swarf, Mostly!

Thread: Cast Iron Straight Edge
24/01/2019 09:35:54

At the risk of going from the sublime to the ridiculous, here's a suggestion for anyone who has the time but not the money:

Find a neighbour who's disposing of an upright piano, the older the better. The one I dismantled (back in the 1970s ) had a cast iron frame on a wooden frame. The cast iron had a bell-shaped cross section, fairly suitable, I thought, for an engineer's level. Not out of the question for a straightedge either? The material I acquired from this source machined beautifully. The piano could easily have been fifty years old when it fell into my hands so aging was probably not a problem. I still have a piece about 24" long under my bench.

I never did make the base for the engineer's level - a complete level turned up in an estate disposal.

The material of the wooden frame was rather special too, softwood by definition but age hardened in condition, 4" x 5" in pieces four feet long and not a knot to be seen!!!

(Before I get accused of vandalism, the neighbours concerned had made long and valiant but unsuccessful efforts to find the piano a good musical home.)

Best regards,

Swarf, Mostly!

Thread: New collets. Bankrupt now.
17/01/2019 14:14:02

Hi there, Mark,

In my applied mathematics course (many, many years ago!! ) we were taught that 'a couple has the same moment about any point in its plane'.

Best regards,

Swarf, Mostly!

Thread: Model engineers - enlisted in war efforts?
02/01/2019 20:18:04

I seem to remember reading that Edgar T. designed a portable ('luggable? ) steam driven electrical generator used by the 'Chindits' to power their radios in the jungles of Burma (now Myanmar).

Precursor to Drax?!?!

I don't know who would have made them.

Best regards,

Swarf, Mostly!

Thread: USB memory sticks
31/12/2018 11:58:29

Here are a couple of web-sites that might be of interest:

**LINK**

and

**LINK**

I hope these help.

Best regards,

Swarf, Mostly!

Thread: Changes in heating equipment - and what else?
26/12/2018 12:34:13

Posted by Nick Clarke 3 on 25/12/2018 20:21:45:

SNIP!

Do you think anything else has changed more?????

Edited By Nick Clarke 3 on 25/12/2018 20:23:04 to correct typo

Edited By Nick Clarke 3 on 25/12/2018 20:24:00

The effect of 'Health & Safety' on accessibility of scrap metal yards.

Now, before I go any further, I'm not against 'Health & Safety'. Several years ago, there was a nasty accident in a scrap yard some thirty miles from here and I wouldn't want anything like that to happen to anyone.

But still, I miss the sort of relationship I enjoyed with my local scrap metal yard when I lived in Essex. The first time I visited them they treated me as though, if they were to turn their backs, I'd put the whole yard in my pocket! However, after a few visits, I'd be greeted with 'What are you looking for?'. I'd answer and then be invited to browse among the skips. I'd move stuff out of the way to see what was in the nether layers but I ALWAYS replaced it tidily. The scrap yard guy came to realise that he didn't need to supervise my every movement and that I'd always buy something (for 'stock' ) even if I couldn't find anything that fitted my answer to his initial question.

As some say 'that was then and this is now!' .

Best regards,

Swarf, Mostly!

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