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Member postings for pgk pgk

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

Thread: Telephone / Internet Scams
18/02/2019 09:33:10

Perhaps they have a morality limit to their scam... or the tick box doesn't go high enough

(or they have a special scam for the 85+ group hoping they're demented and gullible)

Thread: Tube Seam
18/02/2019 07:38:18

Paul,

Rest assured that engineering standards and principles apply in surgery too (within their necessary subset) as do their specialised terminologies. If you ever get a chance to look at a modern orthopaedic text there is data on stress loading, application of supports related to tension sides of structures, forces across joints and so forth.

pgk

Thread: Telephone / Internet Scams
18/02/2019 05:52:53

As a simple point of interest the Opera browser includes a built-in VPN option

pgk

Thread: Tube Seam
18/02/2019 05:49:34

There is undoutedly a cross-over in terminology but pipe implies rigidity and tube implies flexibility as in windpipe or fallopian tube. If in doubt call it a duct and that way it can be a half-pipe

pgk

Thread: Tubal Cain : 0.5mm holes : spade point bit needed ? why ?
16/02/2019 09:51:07

I'll have a crack at speculating on the answer here (but it is just guesswork). According to tom's techniques the problem with tiny twist drills breaking is having a drill that can run fast enough. And of course any twist drill has a thinner core than it's cutting diameter which essentialy makes it weaker still and more prone to bending and wandering. A spade end is also going to be less challenging to sharpen and easier to hone without losing temper.

I've never tried drilling such tiny holes in steel but I have used tiny bone pins like that for orthopaedic fragment repair and as pilots for wire holes..less prone to wandering on starting the hole and can be used in a hand chuck (into bone). If the hole wasn't of any great depth then I have popped bur-holes that size through orthopaedic steel using a high-speed water-cooled dental drill bit but at 1 to 300,000rpm it's a different ball-game.

pgk

Thread: Countersink choices
30/01/2019 10:39:22
Posted by Douglas Johnston on 30/01/2019 09:53:02:

I find the Weldon style zero flute type tend to be more forgiving than other types and cut very cleanly when sharp. Not so easy to sharpen though where the cutting face is formed by an angled hole through the cone shape.

Doug

I've not had need to sharpen mine yet but always planned to spin it up in a cordless drill and offer it up against the belt sander?
What I like about them is one can debur a hole quickly in a hand chuck.

pgk

Thread: Lunar Eclipse
21/01/2019 15:38:32

Persevered? Lol. I just happened to get up early and went out to unlock the barn and noticed a dull light above the hill. "Oh bless my soul" I paraphrased.. it's that bloody moon thingy, I wonder if the camera is charged and the gap in the clouds will stay?

pgk

Thread: Flying experience
21/01/2019 09:12:26

Way before i could finally afford PPL lessons I fancied gliding and went to Dunstable (late 70's I think) but I was too tall and try as they might to get me into a glider as soon as the lid went down all I could see was my own gusset. They suggested the hang gliding club on the cliff. Back then it was a few enthusiasts standing around with anemometers and if they judged the wind was right someone jumped off. Again in that era the only hang-glider that could take my weight was a double. Membership was fluid ..as in death and injury so a steady stream of secondhand gliders but none for my weight and I gave up waiting. 20 yrs later I had the income for fixed wing. That finally lapsed when I remodelled my clinic and went way, way over budget and had to cut back.

Thread: Lunar Eclipse
21/01/2019 05:20:39

A lucky break (in the cloud)

Taken just after 5am with a sony rx10 iii zoomed jpg

Blood moon

pgk

 

Edited By pgk pgk on 21/01/2019 05:26:54

Thread: Flying experience
18/01/2019 22:39:24

My licence lapsed about 20yrs ago, It was more than £99 an hour out of Biggin back then. I had the PPL, IMC and Night ratings on three types- great fun but at the price and therefore restricted actual flying I spent as much validating licences as going off on trips. I did make it as far as Denmark and the island of Anholt in the Kattegat. Fun days.

pgk

Thread: Custom shape Electric radiator
14/01/2019 12:44:03
Posted by Speedy Builder5 on 14/01/2019 10:51:58:

Pkg - How well does reverse flow work when its - 6 deg C or more ?

It heats the room just fine even colder than that.

When i had my clinic all theatres and consulting rooms/offices were only heated/cooled by aircon - 16 units in all and whilst that was Sth London there were still some bitter nights well below 6C. The only issue was that they were mitsubishi units with service agreements at that time and 3 motherboards went out and a few condensation pumps (from the rooms deepest within the complex that couldn't drain by gravity) plus some regassing


An aircon engineer advised Daikin for my previous house as being reliable and the 12yrs that was installed i never even bothered having it serviced. Here the two Daikin units have been in for 6yrs+ again with no issues and Wales can get bloody cold too. All they ever did on the service calls was tap out the dust filters anyway - a simple DIY job.

One of the current units is supposed to be equivelent to a 6KW heater. When it was installed and tested i questioned the thin cable going to it. The installer fired it up and put a meter on it to show me it was only drawing 3 Amps - which I still find unbelievable.

pgk

14/01/2019 10:43:13

If a reverse flow air con system is within budget then running costs for heat should be less than a direct element option with (obviously) summertime cooling for more comfort. I've got a couple of Daikin inverter air pump systems here - main bedroom and main living room - to top-up the woodburner effect on really cold days and make those heatwave periods tolerable... and save lighting the woodburner when it's just a wee bit chilly or I can't be bothered with the mess.

pgk

Thread: Yet more confusion!
13/01/2019 07:57:23
Posted by Clive Hartland on 12/01/2019 22:30:41:

With an accurate compass you are lucky to make a landfall within 7 miles of your destination.

Of course with GPS, it is too small to measure. I wonder if, with all the iron ore that is excavated and shifted around the world it is affecting the magnetic status quo ?

Clive

..rather depends where you start. I used to make compass landfall flying over the channel pretty spot on but would doubt my ability to nail it transatlantic <g>

The best way to stabilise the magnetic pole is to decide exactly where we want it and build all the power stations there and wire everyone up along a line of longitude - Oh, and train pigeons to only fly North-South so the magnets in their heads doesn't pull the flux sideways. It's going to get a lot worse when all the cars are electric...

<exit stage left>

pgk

Thread: Hole cutter
12/01/2019 09:02:35

Depending on the accuracy and project you might consider starting with 5" tube. M-machine list 5" tube with 3/4" walls.

pgk

Thread: Powerline question
11/01/2019 18:52:29

I believe the above speculation is the correct answer. I had a closer look at the poles today while walking dog and the transformer pole is newer looking than the others.

Thanks guys,

pgk

11/01/2019 10:42:49

Good point. No changes in my time but possibly before. Thanks

pgk

11/01/2019 09:48:12

I'm curious as to why this choice was made. I have a three phase line running at the bottom of home field. For the house supply two wires go to a pole transformer and then a run of twisted pair to the next pole then it splits into 2 single uninsulated wires for the next three poles before becoming a single cable from the last pole into the house. I'd never really paid much attention to it until last week when a pheasant made a navigation error and fried itself shorting out the bare pair (and blowing the transformer fuse).

I'm guessing that cost prohibits a single insulated wire being used (diameter/resistance?) but why the change from a twisted pair to bare wires or indeed the use of a twisted pair to begin with? Safety for folk working on the transformer?

pgk

Thread: Algebraic paradox
05/01/2019 11:29:18

As is pointed out a-b-c=0 so as soon as you move ac to the left side of the equation you have 0=0

Thread: clock key manufacture
31/12/2018 06:45:57

The idea of forming press around a mandrel as in the OP should be do-able just in a bench vice albeit the time spent making a jig to keep the register is OTT for a one-off.

It'd be simpler to mill a square channel into some stock such that you have a tall flat-bottomed U shape, fit a mandrel then tap the sides over with a hammer and drift the mandrel out.

The laziest idea I can think of is to use round tube or a drilled rod, make up a square section plug, coat with release agent (perhaps just candle wax) to mould the centre when filled with epoxy steel.

pgk

Thread: source of gauge glass
31/12/2018 06:24:37

You can get 3.5mm diameter watch ace magnifiers if that's any help:

**LINK**

Otherwise I suppose you could turn down the 5/32 by spinning it against a diamond grit jammed with tailstock support and doublesided tapes?

pgk

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