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Member postings for Brian Oldford

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

Thread: Grid Frequency [mains electricity]
14/08/2019 08:25:21
Removed

Edited By Brian Oldford on 14/08/2019 08:33:02

Thread: Jim Al Kahlili : Revolutions
01/08/2019 18:20:49
Posted by Ron Laden on 01/08/2019 18:08:06:

Thank god for that, if they ignored the rules of the motorway like they do on all the minor roads the death toll would be beyond belief.

Think Darwin. Think Darwin.

Thread: Pendulum enquiry
23/07/2019 20:27:30
Posted by old mart on 23/07/2019 19:45:01:

Electromagnets switched by some sort of proximity indicator all set near to the pivot point.

These had a mechanism that detected when the pendulum's travel fell below a certain range.

**LINK**

Thread: Piece of Cake
18/07/2019 17:16:08
Posted by Plasma on 18/07/2019 16:23:55:

........

I cant begin to picture what Howard mentioned, a 300 ton crank? Golly!

Amazed of Barnsley

They put the crank in place and build the engine and ship around it. cheeky

Thread: Wood in small (or large) amounts
18/07/2019 17:10:22
Posted by ken king, King Design on 18/07/2019 16:38:19:

I may be wrong, but I think Limewood is highly prized for carving due to fine, straight grain and excellent cutting characteristics. Wasn't it used extensively by Grinling Gibbons ? Look at his work with undercut detail and be prepared to be amazed. I'd love to know how he sharpened his chisels and gouges.

If I'm right, you missed a golden opportunity, and you know what Omar Khayam said about that.

In the past Lime was used by pattern-makers for producing intricate shape because it carves so sweetly. I've only used small samples finding the only superior material being some of the lighter grade Sikabloc foamed polyurethane foam boards.

Thread: Mallable Iron
16/07/2019 19:03:58

Assuming they are what they claim to be, the clue is in the word "malleable". The swarf from malleable iron will usually appear somewhere between mild steel and regular grey iron.

Thread: Myford ML7 tailstock bore, and threading the barrel to fit a chuck
14/07/2019 11:47:31

Methinks a specially made tailstock barrel might be your answer. Drilled through as large as possible and made with an enlarged end to accept a standard Myford chuck thread.

You have the machine there to make such an item.

Thread: Aldi bargain laser level
14/07/2019 08:35:03
Posted by Clive Hartland on 14/07/2019 08:29:02:

Standard Instrument securing thread in the UK is 5/8" x 11 Tpi. Whit. form. There is another US style at 11/16 " x 11 Tpi. This is mainly used in Aircraft building, test equipment.. Also some military applications, just to be awkward I think.

That's the wonderful thing about standards. You can have as many as you want. laugh

Thread: More mystery tools
13/07/2019 17:16:14

Factorial Wow!

Thread: Another scam
11/07/2019 17:57:22

My confidential waste usually goes into the firebox of a standard gauge locomotive at a heritage railway near me.

Not overly green but very very secure. smiley

 

Edited By Brian Oldford on 11/07/2019 17:57:43

Thread: Refurbishing a Dewhurst Switch : MEW 282
08/07/2019 21:15:31

I sold my Dewhurst on when I went to a VFD.

Thread: Phone charger
02/07/2019 08:09:03
Posted by clogs on 02/07/2019 07:41:26:

. . . . .

nothing is charged over night in my house . . . . ..

I take it you won't be getting an e-car any time soon. wink

Thread: Thread Bare
02/07/2019 08:05:47
Posted by Mike Poole on 02/07/2019 07:41:53:

Once the die holder leaves the guide it does have a bit of wobble but if that is not a problem then it is certainly quick. I think I would go with Duncan’s plan that does not involve any living clamps.

Mike

I agree far better not to hold the die-holder under power, but in fairness at least the OD of the holder is smooth so less likely to cause injury.

01/07/2019 17:20:42

Can you not buy/make some M6 x 0.75 studding?

Thread: Advice please
01/07/2019 14:33:05
Posted by Bazyle on 01/07/2019 13:22:22:

From the other threads isn't it the case that he does eventually supply the parts just really slow and haphazard in the way he runs the business. Some of it is also due to the fact that castings are made in batches only occasionally.
It is a real pity he doesn't either sell some of the designs to someone with a suitable business record or get in a partner to help.

Edit: by the way it is better not to put your email on the open web for spammers to harvest. People can contact you using the PM system. The mods can remove the details if you ask nicely.

Edited By Bazyle on 01/07/2019 13:25:55

I'm looking for designs that are now out of copyright with a view to producing castings for same. I'd also be happy to discuss taking on some of those designs if the terms are right.

Thread: Advice on tracking down potential buyer.
01/07/2019 13:04:03

In the "For Sale" I section recently advertised a surplus copy of a model engineering book.
I received a response from a potential buyer to which I replied to both via this site and the e-mail he sent. Since then I've heard nothing. Have I done something wrong?

If that gentleman is still interested please get in touch or let me know you are no longer interested so I may re-advertise it.

Many thanks in advance.

 

Edited By Brian Oldford on 01/07/2019 13:05:14

Thread: Advice please
01/07/2019 12:59:10

Don't be tempted to name and shame prematurely. It might prejustice your case.

Thread: Boiler cross tube leak.
24/06/2019 12:49:40
Posted by duncan webster on 20/06/2019 10:11:44:

Full size boilers are rather different. Firstly they are steel, which rusts and tends to seal any very small leaks, second they have rivetted lap joints, so you have a long leak path. . . . . . .

Although they do usually have riveted lap joints the majority of fireboxes are copper. There are one or two "new builds" that have gone down the welded steel route with "variable" results.

Thread: Chinese tacho - beware
22/06/2019 13:46:41
Posted by duncan webster on 21/06/2019 22:50:02:

I've never suggested that the Chinese ones were rubbish, in fact it looks quite well made, the problem is the update rate. if you just want to measure the speed of a steadily rotating shaft they are fine, for adjusting something which has a high acceleration not so good.

If you send me a pm I'll try to find the schematic of my home brewed one, you can certainly have photos and the code, but it does involve soldering a very simple stripboard circuit. However my hard drive can be a little difficult to navigate (chaos might be a better description), so it might take a couple of days

Duncan

The organisation of your filing system is similar to mine. However you took a somewhat different route than I am taking to resolve the problem.

I'm investigating the possibility of decreasing the sample time and increasing the number of pulses sampled by increasing the number of magnets passing the Hall effect device.

Whether or not will be successful remains to be seen.

Thread: Boiler cross tube leak.
20/06/2019 09:12:34

How many full size locomotive boilers are completely leak free?

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