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Member postings for David T

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

Thread: Hot rail tracks
26/06/2018 10:31:55
Posted by Hopper on 26/06/2018 01:05:41:

Expansion gaps etc can only cope with so much expansion. In parts of Australia they are painting track rails with a white insulating paint. Drops the rail temp by 16 degrees C and reduces expansion accordingly.

It's not uncommon to see white rails in the U.K., but usually just around the pointwork. I always assumed this was just to make cracks in the rails more obvious, but I wonder if that is secondary the insulating benefits. Points can be easily affected by the heat due to the tolerances involved (certain designs are more susceptible than others). Certainly the casings of the point machines have been painted white to reflect the heat.

Thread: Aircraft General Discussion
21/05/2018 15:44:27

Posted by martin perman on 20/05/2018 20:04:02:

Yesterday saw the Blenheim displaying over Shuttleworth then it and a Spitfire passed overhead in formation on their way to the Midlands around four pm, this afternoon after I had returned from Stockwood Park, Luton I was un hitching my trailer when the Spitfire passed over on its way to Duxford with the Blenheim two minutes behind.

Martin P

I've been meaning to venture out to see the Blenheim...... I've only seen it by accident, I was in the workshop and stuck my head out just in time to see it go over. At the time I didn't know there was one in flying condition, so it came as quite a surprise!

On Saturday we saw a Folland Gnat over Hanningfield Resevoir; didn't know there was any of those about either.

08/05/2018 14:03:43

Posted by Speedy Builder5 on 08/05/2018 11:10:58:

David T - Tool tags like this one (1963 - 1966)

Ours were rather more agricultural! We were all assigned a number based on our locker number; corresponding tags were held in the storeroom. When something wasn't returned by the end of the day, the storeman would bellow across the workshop, "Number Sixty One! You have not returned your screwdriver!" Woe betide anyone who angered Brian the storeman.....embarrassed

Several of our instructors were ex-BAE so no doubt that's where the practice stemmed from.

08/05/2018 10:22:21

Posted by Martin Kyte on 08/05/2018 08:55:31:

BAe when working on Nimrods at Woodford had a tool 'check' sustem using brass tokens so nothing could be left in the airframe.

regards Martin

There was a similar system in use where I did my apprentiship...... to stop us herberts from losing / pinching the tools

30/04/2018 16:05:05
Posted by Martin King 2 on 26/04/2018 07:40:43:

Hi All,

Sitting at home last evening with the French doors open, suddenly heard an aircraft noise close by and then two of the strangest aircraft I have ever seen circled our village at a REALLY low altitude making hardly any noise compared to the normal stuff we see and hear.

They had two ENORMOUS propellers and a squat fuselage, the props looked totally out of proportion to the rest of the craft. Did not make out the markings sadly. They circled our immediate area for about 5 mins and then flew off.

I would say that they were only 200-300 feet high, so super low.

Someone said that there is a warship in Weymouth Bay buy have not checked.

Weirdest thing I ever saw!

Martin

Hardly any noise?! Last summer I heard what I thought was a Chinook over west London. Eventually I spotted a vaguely V-22 -shaped speck in the distance, it must have been several miles off. Would love to see one in flight a bit closer smiley

Thread: Car boot sales
30/04/2018 15:58:57

I bought most of my woodworking kit from boot sales, never had much luck with engineering tools though. The best I've got is some Moore & Wright mics.

Thread: A recommended live center?
07/03/2018 14:46:46

Posted by blowlamp on 06/03/2018 20:03:45:

Posted by David T on 06/03/2018 18:28:43:
Posted by Michael Gilligan on 06/03/2018 16:42:57:

Well that's a let-down David

I thought you had already made some pre-emptive dismissal of blowlamps's argument, before he presented it ... and now you just submit.

MichaelG.

I do apologise for my poor form. I shall try again:

Posted by blowlamp on 06/03/2018 13:23:34:
Posted by David T on 05/03/2018 17:22:15:

... therefore it's the "dead" centre, regardless of whether it's rotating or not......

Being a pedant, I must point out that a running centre is driven by the workpiece.

All of the running centres recommended thus far are, presumably, shipped in some kind of box and are certainly not engaged by "the workpiece". If a running centre is "live" by virtue of it being driven by the workpiece, then by definition it must be a "dead" centre until such time as the customer has received it and put it to use.

Once again I apologise for my earlier transgressance. I hope this satisfies the pedantic community devil

Edited By David T on 06/03/2018 18:30:08

Your arguing skills are BOSS like!!... fist

... You'll fit in well around here.

Female tutor by any chance? smiley

I learnt from the best wink

If only my engineering talents were as sharp.....

06/03/2018 18:28:43
Posted by Michael Gilligan on 06/03/2018 16:42:57:

Well that's a let-down David

I thought you had already made some pre-emptive dismissal of blowlamps's argument, before he presented it ... and now you just submit.

MichaelG.

 

 

 

I do apologise for my poor form. I shall try again:

Posted by blowlamp on 06/03/2018 13:23:34:
Posted by David T on 05/03/2018 17:22:15:

... therefore it's the "dead" centre, regardless of whether it's rotating or not......

Being a pedant, I must point out that a running centre is driven by the workpiece.

All of the running centres recommended thus far are, presumably, shipped in some kind of box and are certainly not engaged by "the workpiece". If a running centre is "live" by virtue of it being driven by the workpiece, then by definition it must be a "dead" centre until such time as the customer has received it and put it to use.

Once again I apologise for my earlier transgressance. I hope this satisfies the pedantic community devil

Edited By David T on 06/03/2018 18:30:08

06/03/2018 16:23:02
Posted by blowlamp on 06/03/2018 13:23:34:
Posted by David T on 05/03/2018 17:22:15:

I must be the only person still using a solid (dead) centre. It's a half-centre at that. I've got a no-name running centre but I find more often than not it gets in the way.

I'm surprised the pedants haven't pointed out yet that a "live" centre is the one in the headstock. The centre in the tailstock is not driven, therefore it's the "dead" centre, regardless of whether it's rotating or not......

Being a pedant, I must point out that a running centre is driven by the workpiece.

Haha, touché

05/03/2018 17:22:15

I must be the only person still using a solid (dead) centre. It's a half-centre at that. I've got a no-name running centre but I find more often than not it gets in the way.

I'm surprised the pedants haven't pointed out yet that a "live" centre is the one in the headstock. The centre in the tailstock is not driven, therefore it's the "dead" centre, regardless of whether it's rotating or not......

Thread: Lathe stand to suit an ML7
19/01/2018 12:57:01
Posted by peak4 on 18/01/2018 10:28:49:

a 5 foot length cost me £12 off ebay, though I had to wait for a while for one to crop up at the right price.

Whereabouts are you, as I now know a supplier that does offcuts at a decent price?

I am in Essex. Thanks but I am just reviewing my options at the moment. A new stand will only become necessary if I decide to reorganise the workshop; something which I am still mulling over at the moment.

18/01/2018 09:38:56

Thank you all you the, erm..... broad range of opinions!

The experiences expressed regarding the store-bought benches are food for thought.

Trevor Drabble's suggestion of the Axminster lathe stand is certainly interesting; it is significantly cheaper than the Myford stand. They have neglected to state what gauge the steel is though, which is unfortunate.

KMP's fabricated stand is beautiful, and I suspect is much more rigid than any of the commercial benches. If I only I had the ability to weld!

With regards to timber vs metal, I am not convinced that a sheet metal stand (at least without serious reinforcement) is any more rigid or stable than a wooden one. Peak4's granite top sounds like the most stable option, irrespective of what bench is beneath it. I fear that working with granite is beyond my capabilities though. What type of bits do you drill granite with?

17/01/2018 09:25:44

Morning all, thank you for your replies.

I am comfortable (happy, even) doing a bit of woodwork, so I can knock up a stand-alone bench if need be. I am trying to decide whether the cost of materials + the time required is worth it versus a store bought bench that's ready to go.

Naturally any bench will have to allow the lathe to be levelled and / or shimmed. My present bench is just over 3' high which is a comfortable height for me. I expect any bench I bought would be lower, so I'd need to use raising blocks anyway. Unfortunately I only have a small hatchback for transport, so any option I take either has to be delivered or dismantled / flatpacked.

On the other hand, I could just buy a bigger, floor-standing lathe.........

Thread: Another new member
17/01/2018 09:00:54

Thank you for the welcome!

Thread: Lathe stand to suit an ML7
16/01/2018 16:19:23

Afternoon all,

Does anyone have any experience using a "mechanic" style commercially-available workbench as a lathe stand? Something like this:

https://www.machinemart.co.uk/p/cwb1205p-5-drawer-workbench/

(not necessarily that one, just the first one I plucked from the internet. Also, no connection to the vendor etc etc)

My lathe (an ML7) is currently mounted on a wooyden bench that I built onto the wall of my workshop. It has served me well, but I am thinking about reorganising the workshop. A bench like the one above would allow me to move and re-mount the lathe with a minimum of fuss. And again in the future, should the need arise. The drawers would be useful too, of course.

Am I barking up the wrong tree? If one of these benches is viable, are there any brands I should look out for?

Thanks!

Edited By David T on 16/01/2018 16:20:58

Thread: Another new member
16/01/2018 14:43:20

Hi everyone,

Another new member here. I've been lurking for a while and I thought it was about time I signed up. I've had a lathe and mill for a number of years, but I don't think I can call myself a model engineer yet. I haven't got around to making any models! Hopefully that will change soon as I have a set of Unit Steam castings on the bench. Until now the lathe has been steadily employed in fixing things, or supporting the woodworking activities of the wife and I.

For what it's worth I hope to attend Ally Pally again this weekend, having been for the last few years. The dreaded man flu is threatening to torpedo that plan though.

Anyhow, I look forward to joining in with the forum!

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