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Member postings for jason udall

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

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Thread: Casting brass or bronze
26/01/2016 09:44:55
Btw. There exists kits for casting (brass) using a microware oven ..basically lost wax investment casting with special slip that creates the "crucible"
26/01/2016 09:42:19
Mmm..ignoring for a moment the hazards of zinc fumes...

What is the loss rate of zinc...
I mean what is the composition of the alloy if "cooked" for a while...would the notional alloy of copper/zinc reach an equilibrium when the "excess" zinc has evaporated ?..
Brass..horid stuff..usesless in boat fasteners. .you get de zincification..and are left with crumbly copper screws
Thread: What was this used for?
25/01/2016 15:12:33
http://www.gracesguide.co.uk/Thomas_Smith_and_Sons_of_Saltley
Thread: What Did You Do Today (2016)
24/01/2016 11:20:21
https://youtu.be/zR3abFbgXUw
24/01/2016 11:11:28
Watched some you tube.

I highly recommend suburban tools...
A great guy Don.
Who appears to be an accomplished machinist. And educator..
More intrest to people chasing the tenths..in production. .
Like how to check your surface plate
Cylindrical square etc
Well I enjoyed it.
20/01/2016 18:46:37
Swapping out the alternator often fixes the problem..
Sometimes not for the expected reason.
To change the alternator you will remove the battery leads...at battery
You unplug/unbolt power and "ign" wires

You un bolt the sad thing
Now the surprise.
You clean the earth connection before fitting the changed unit..you check /set the alternator belt
You clean and reconnect the wires. ...
And test

Hussah ! the new alternator works...

Now was it the alternator or was it the clean /refit of the connectors? ....

Edited By jason udall on 20/01/2016 18:47:50

Thread: pressure vessel testing
18/01/2016 15:40:44
Love this forum sw

Edited By jason udall on 18/01/2016 15:41:49

18/01/2016 15:40:10
Gentlemen.
It appears that you have discovered one of the important principles of modern life.

For example.
Design/ build /test vessel to given pressure both working and safety levels..
Readily achieved. ..

Negotiate "relavent " standards.. ( esp. Identify said standards)...not so easy.

I have this from my day job with low voltage / emc/machinery "directives"...buckets of test houses that will take your (modest ) fee...
But sign off to a directive..nfc..."we just test the tests you ask for. .up to you to chose the test criteria".and make the declaration. ..
* nfc ...relates to low probability. ..

Edited By jason udall on 18/01/2016 15:43:18

Thread: How does this work.?
14/01/2016 08:56:34
Not certain

My belief is that in part damping and support for the point of the drill...stabilization.

Its old..saw it listed as tip-dodge..in 1800's book..old then...
Thread: War and Peace
11/01/2016 11:17:20
Clive...think Catherine the Great
Thread: Electronic water softeners.
10/01/2016 23:37:33
I would say Woo Woo to this.

But
I have seen water divination work.
Have some idea how/what influence is being responded to but can't prove it

On another note .
Water was considered non magnetic...
Well I have seen footage of water/water containing substances. .supported in intense magnetic field...
So despite the unconvincing "evidence" for these softeners ..we may in years to come know differently.
I will say that a chap at work had a magnetic wrist band...for some woo woo new age health benifit.....funny thing never got swarf stuck to it..
Anyway he felt the benifit...curious I got one from same supplier. .took it apart. ..found no magnets..but there was a void for one...guess the makers found they worked just as well without the expensive magnet and saved a few pennies not fitting them

Edited By jason udall on 10/01/2016 23:39:27

Thread: DAB workshop reception
10/01/2016 00:01:30
Thanks Bazyle.

So the digital bit applies to the wider channel bw..
Mmm
New to me but been out of antennas since fss at uni
09/01/2016 20:44:11
We are all wavefronts on this bus
09/01/2016 20:41:40
Baz...
Re digital yagi..really ?

My comment was the fact that all the antenna theory I remember dealt with analogue e/m waves...cant see where a "digital" wave form propagates other than as a fourier series...of analogue.....but hay...what ever.
Maybe I just didn't get the joke

Edited By jason udall on 09/01/2016 20:43:08

Thread: Cutting Glass Tubing
09/01/2016 12:31:45
Fortune favors the brave
In this case bold...
Always had most success in bold cuts..hesitation seems to guarantee failure
Thread: DAB workshop reception
09/01/2016 12:23:53
"Forum error"

Edited By jason udall on 09/01/2016 12:24:52

09/01/2016 12:23:18
Posted by Bazyle on 09/01/2016 12:16:18:

Height generally helps. You might try a 12ft pole outside with a dipole on it that you can rotate to point towards your nearest transmitter. You'll need a coax cable down to your radio and a coax input.

Mmm dipole...rotate..Would be Intrested in how that works? Now a yagi ( tv aerial)..that would help

By the way any one know how a digital yagi is supposed to work?

09/01/2016 11:33:31
SHED =TIN BOX?

Also you mention marginal reception on tv..
Dab I believe is the same broadcast as the tv...so you are probably on a hiding to nothing
Your tv will probably have a high gain aerial ..unless you dab radio has provision for external aerial you are stuck

Dab does not seem to have as wide a take up that the bbc had hoped ( once past a certain limit they get to "sell off" the spectrum)..
Where I live we have what is called.."Freeview-lite"...
Basically less channels. .less dab...lower power...
But just enough to meet the requirement of " coverage" to meet the government targets
Thread: small pump
09/01/2016 10:51:11
Have a care...petrol...kinda exposive...
Just saying..
I would use simple squeeze pump sold for petrol..
Various persons will find fault with home made ( how ever much better/safer your pump is) that doesn't come with the right writing on the side.
Just saying
Thread: Fish out of water
09/01/2016 10:43:55
Welcome
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