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Member postings for Dave Halford

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

Thread: Horizontal miniature steam engine
04/09/2023 23:51:23

If it stopped as in the photo on tdc or bdc it wont start again.

flicking the flywheel may help?

The steam may be too cold by the time it gets to the cylinder - insulate the pipework

Thread: Identifying plastics
04/09/2023 16:37:12
Posted by Kiwi Bloke on 04/09/2023 11:27:40:

I am restoring a couple of accordions, dating from the 1950-60s. They contain some components that appear to be moulded material of some sort. I'd like to be able to identify the material. I'm aware that 'hard rubber' (whatever that is - it's hard and black...) was/is used for saxophone mouthpieces, but don't know much about what plastics were around in my childhood. Accordions have traditionally been covered in moulded sheet celluloid, but the things I'm interested in are thicker-section items like feet and moulded key facings, which I doubt are lumps of celluloid (although the key facings might be...).

OK, I know there were thermosetting materials like Bakelite, and some thermoplastics, like acrylic, polystyrene, polyethylene, nylon and possibly ABS, but what else? Are there practicable ways of identifying plastics from this era? From plastic kit-making days, I could tell polystyrene by its smell, but my sense of smell is poor now, and, although a childhood pyromaniac, I've forgotten the burning characteristics of those plastics the identity of which I knew. Also what is 'hard rubber'?

Edited By Kiwi Bloke on 04/09/2023 11:28:52

Just don't burn test suspected celluloid without a lot of care, it burns very fast

Thread: Poor quality drill bits
04/09/2023 14:16:58
Posted by JasonB on 04/09/2023 13:26:40:

Though most of the Dewalt stuff can trace it's parentage back to Elu which WAS German

Edited By JasonB on 04/09/2023 13:28:25

However,

From your link it appears any German parentage including the factory, was phased out before 2001.

In 1992 Black & Decker introduced the brand Marke deWalt, which up until then had only been rederved for radial arm saws, for the field of professional power tools. The power tool, which has been distributed in Europe under the brand ELU, have become increasingly similar in construction to the deWalt models.

In 2001 the brand ELU has been completely replaced by deWalt and the former production site in Europe has been closed.

04/09/2023 13:22:43
Posted by Samsaranda on 30/04/2023 21:50:11:

Found a suitable replacement, Amazon had a DeWalt with keyed chuck reduced from £130 to £87 so I purchased it and received it today, most impressed with its looks, hope it performs as expected, anyway the purpose of my posting is that when you look at the country of manufacture both the Bosch and the DeWalt are made in the People’s Republic of China, so much for perceived origin of both brands being in Germany. Dave W

Dave,

There lies your problem. Dewalt were born in the US in 1924 bought by our old friend B&D in 1960. They were never German.

Thread: Compressor question
03/09/2023 23:32:08

Is it just a matter of fitting a pressure switch in the line somewhere?

Sadly no, it's not designed for it. You would need to insert a modern unloader in the large copper pipe and the pressure switch will need a new oulet from the tank + the old system may interfear.

Edited By Dave Halford on 03/09/2023 23:57:41

Thread: The crumbly concrete problem
03/09/2023 15:31:26
Posted by Mark Rand on 02/09/2023 20:49:54:

I might be getting to a certain age, but I'm getting increasingly irritated by the likes of the BBC dumbing down engineering stories and getting them hopelessly wrong in the process.

What do you expect, some BBC morning news presenters don't what what a Blue Tit is so they dumb it down to the level they they understand.

03/09/2023 15:25:33
Posted by vic newey on 02/09/2023 20:24:05:

Exactly the same happened with Spaghetti junction flyovers which involve 559 concrete columns being replaced, also large overhead sections of the M5 at Oldbury near West Bromwich caused long delays for many months

Wasn't that Hi Alumina Cement High Alumina Cement - Manufacturing, Pros & Cons (civiconcepts.com) the link imples this stuff is still great even though roof beams in a school collapsed back in 74.

03/09/2023 15:05:59
Posted by Graham Meek on 02/09/2023 17:23:55:

What really gets me is that they have no records of where the stuff was used.

Nothing more than a "grade A" farce as regards how this has been handled.

Regards

Gray,

It reminds me of a recent contributor on here 'Drawings are for dum people and toymakers'

Buildings are built using drawings, do they burn / shred them in case they may be held liable later?

Thread: Bandsaw Blade Tension
01/09/2023 10:47:26
Posted by Howard Lewis on 31/08/2023 14:53:41:

Jacques Maurel produced a design for Tension Meter, and has, fairly recently, shown his calculations in MEW.

From memory, the standard 64" x 1/2" x 0.020" blade in the generic 4 1/2" bandsaw, needs something like 0.05 - 0.07 mm extension to achieve the correct bvtension.

A correctly tensioned blade, in a fairly well set up bandsaw produces more accurately, and blade life is extended in my experience.

Howard

If as Howard says the tension is set by elongation of the blade why would a broader blade need more elongation to have the correct tension? Steel will only stretch so far regardless of cross section so though it will take more force to produce required extension the 0.05 to 0.07mm is still valid.

Thread: The beginning of the end for Copper telecomms
30/08/2023 21:02:33
Posted by Frances IoM on 30/08/2023 20:34:26:
a few weeks ago there was a local power cut to around 100 houses (some fault in a local sub station) it also took out the openreach FTTC boxes in the street thus internet was lost even tho I could power up the router from a UPS - analogue voice over the copper pair still worked and allowed me to report the fault

The exchanges have big UPS units and generators so the copper still works. Street cabinets only have enough power to safely shut down

30/08/2023 19:23:21

The old trunk twisted pair cable network, most of which terminated in B'ham Telephone house on it's way to and from both ends of the country was ripped out 10 years ago. The coax may still be there as there's not much metal in it.

I had some pleasure ripping out the fruits (90 tons of cable) of 23 years spent putting all that Transmission into service. Strange to see that 20 years after leaving the record cards so carefully filled in were still there. The building is now stuffed with fibre kit that needs no-one there permanently to look after it.

Thread: Help, my garden fork is........forked!
30/08/2023 15:55:52

I've used a calibrated 2lb lump hammer over a brick as an anvil.

If you lean on the handle after already miss-treating it due to bending the tines in the first place you may need to find a new handle as well.

If you can't shift sometime without bending tines get a pickaxe.

Thread: Brazing & corrosion
29/08/2023 09:55:20
Posted by Kiwi Bloke on 28/08/2023 11:00:49:

Mark - unfortunately, it's the underside of the deck, so it gets sand-blasted (dusty conditions in summer), and caked with pulped wet grass. Paint doesn't stand a chance...

However spray on stone chip (but not the Shutz stuff) certainly withstands grit blast cleaning. Stone chip stays slightly rubbery which takes the sting out of blade driven projectiles.

Thread: Replacement motor for Lathe
27/08/2023 10:44:22
Posted by barry on 26/08/2023 22:22:56:

Hello,

I have just bought a Myford ML2 I think. It came with a very old motor. The specifications on the motor are HP1/4, volts 220, amps 2.6, cycles 50, revolutions 1450. I do not like the look of the wiring so I have a spare motor rated at Amps 1.5, HP 1/3, revolutions 1420, HZ50, volts 230.

Would this be a suitable replacement for the old motor?

Thanks

Yes depending on the motor spindle size matching.

Thread: Electric motors
23/08/2023 17:52:55

Clive,

Doing the due diligence thing and checking the feedback none of those units have ever been sold by that seller.

All the similar sellers have similar low feedback and sell the same gun related gear, but no electric motors so far. it's likely you would end up waiting a long time for them to ship.

Picking up on what Robert is saying the connectors appear to be quite lightweight for what would be UK 4A or US 8A if fed straight off the mains so the controller must be pushing significant DC voltage.

Thread: When boredom overtakes, make something, anything!
23/08/2023 17:18:50

Oh er missus, a wedgie

Thread: What adhesive?
23/08/2023 17:14:38
Posted by Bo'sun on 23/08/2023 13:46:55:

Good afternoon All,

As the title suggests, what adhesive to fix Neodymium Magnets to Mild Steel?

I have Araldite and JB Weld. Are there better options?

I guess roughing-up (and degreasing of course) both surfaces would be a good idea.

Watch the roughing up, Neodymium is very prone to rust hence the plating on them.

Thread: Centec milling machine NT30 chuck.
23/08/2023 17:08:59

I have gently used the horizontal arbor in the vertical head angel

Thread: Smoke box best way too make
23/08/2023 16:59:38

I did a 6" dia by 3 5/16" wide out of 3mm steel with a 300mm 3 in 1 roller, cutter, bender.

You do it in very small steps as the gears don't reach each other. You do not need to use tools on the roller wingnuts to get drive and don't extend the handle. You might get away with twice the length as yours is only 2mm.

If it won't work nothing is lost as long as you didn't force it.

Thread: When boredom overtakes, make something, anything!
21/08/2023 11:11:26
Posted by Tony sacc on 18/08/2023 04:08:28:

Its just my attempt at Chinglish. At least it doesn't actually say F off. I passed it by a Chinese girl who spoke Cantonese, she didn't know, said it was maybe something like drill sharpener. So apparently event the Chinese can't speak Chinese, Cantonese or Mandarin. Maybe,the Chinese are like the Malays, and have two versions of their language, one spoken by the well educated, the other spoken by market people.

Edited By Tony sacc on 18/08/2023 04:13:09

No Tony it's just that you can't write any form of Chinese properly and I wonder how that XS 650 got built without drawings.

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