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Member postings for Clive Hartland

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

Thread: Case Hardening
04/12/2019 18:27:36

Chris,Make your own mixture by chopping up an old leather shoe and some charcoal. Place in a metal box and get it hot and soak for a while and then tip staright into some salty water. You will get some discoloration. but it will be surface hard. No doubt others will come in with ideas. Kasenit is good if you can find some.

Thread: Amplifier Repairs..
04/12/2019 18:24:34

This takes me back to when I first heard stereo. I lived above a model shop and I got on well with the owner and he showed me and let me hear a stereo record, wow, the doppler effect of a train going past to me was amazing. This set me off on an Amplifier building session. The choice, a Mullard 5 x5 or a 10 x 10. So I made the 5 x 5 and made the chassis and managed to get all the parts to do it. Except the output Trafo. I eventually got it wound by a local lad and it was fine. One experience was connecting the speaker the wrong way and getting the , 'Motoboating' effect.

A while later I was in Kenya and we had a few records but I wanted to listen to specific radio staions and having an LCR meter/bridge at work. (Querey that) I made a fixed frequency diode and capacitor and a resistor for BBC world service. It worked fine so I made others for odd staions and at various times of day could hear the US or South Africa, also the local FBS station. sadly I am now almost deaf and cannot hear music nor telephone voice, the TV is like jungle noises, thank heavens for text.

Thread: Annealing Brass
01/12/2019 09:50:14

With brass sections that are formed by extrusion like square or flats they distort when machined. I found out this the hard way and had to re-make bits. Soon learned to anneal the btass and and quench from dull red. Makes it softer as well and machines better.

With brass tubing you will have a problem bending at right angles so here fabricate the bend.

Thread: Long bed lathes affected by the tide
29/11/2019 22:24:23

One of the helicopter companies had problems measuring the jig they made the helicopter body in. Using a Leica N3 level for measuring, it came back 3 or 4 times to me for calibration and was withing the fine tolerance we had. More complaints and the Tech rep. visited and found the shop on the bank above a tidal estuary and stayed long enough to prove that as the tide came in it heaved the concrete base and affected the jig and levelling. They would level before lunch and come back and find all levels and measuring points all over the place as the tide receded.

Thread: Seismic detection
29/11/2019 13:59:01

When we took over a new building in Milton Keynes it had a vibration sensing circuit in the metal walls. I was called out time and time again with nothing found except the wall sensors tripping. Then i realised what it was, it was Silerstonne car race week and as the helicpters were bringing visitors they came over the building and the chopper blades set up a vibration enough to trigger the alarm. Short order to te alarm specialist who fitted it, cut it off!

Similar call out one night and they had smashed a window at ground level, entered and had taken a computer that was used for stock levels. what they missed was 5 Hewlet packard latest spec. computers that they used as a step coming through the window. Later when police came they contacted another police uint up the road who gad caught two chaps, queruing what was innthe boot of their car showed the exact items taken from our store.

Thread: Black anodised steel????
12/11/2019 08:12:02

Sheradising is another dark.black finish you see on twist drills, this done with steam at 500c.

Edited By Clive Hartland on 12/11/2019 08:12:22

12/11/2019 08:09:11

While working on large gun recuperators the internal parts were given a Black Chrome finish, they were first copper plated then immersed in a hot bath that had the chemical mix in it. After a time the items came out and the copper was brushed off leaving a lovely shiny black finish, supposedly rust resistant.

I have tead that Browning shotguns had black chrome bores to stop rusting.

Thread: Additives to kerosene for degreasing?
30/10/2019 22:18:00

Be careful with white spirit, if using bare hands it has a way of affecting the nails and cuticles and cause infection.

I also believe if white spirit soaked rags are binned they can cause self ignition,

Thread: Built-up edge
13/10/2019 22:15:56

You have not said what type of Alu you have. I would expect HE15 or HE30 to machine quite well at the speed you quote.

Having one time ordered Alu as HE30 I got some Alu which turned like chewing gum, changed my supplier PDQ.

Thread: What solenoid to use?
13/10/2019 09:37:36

There are some gravity type flaps set at a slight angle that only open when there is internal pressure. Often fitted to cooker hoods, no leccie iused at all.

Thread: uv cured gap filling adhesive
08/10/2019 13:55:34

For some time UV cured optical cement has been in use in the optical manufacture and spectacle lenses, particulary the type with a close up lems attached.

Prior to the UV cured optical cement Canada balsam was used that slowly yellowed with age. From what I see in the trade the UV cured cement does not yellow.

Thread: windoze 10
01/10/2019 07:50:58

A recent Win 7 update has added an address bar to my bottom bar on the screen, what is this?

Clive

Thread: Water in fuel
29/09/2019 08:59:17

It comes to mind, when I bought my first new Ford Escort Estate the fuel tank was leaking, I went to the Ford garage under warranty and they agreed and ordered a new tank but after a 2 week wait decided to take things into hand myself. Drained the tank and flushed out with water a few times and could not smell petrol anymore. I was able to take it to a friend who had a gas torch and fluxed the the cleaned area and flooded it with solder and killed spirits.

On examination I could see tha the petrol tank interior was lead coated ! so no corrosion.

PS, never did get the replacement petrol tank. Thank you Ford.

PS. sorry, I forgot to mention that this was an Export car, which may have a relavance.

Edited By Clive Hartland on 29/09/2019 09:00:22

Thread: Worried
28/09/2019 10:02:48

It has got to the point now that I no longer worry about the mpg, I just fill up with £20.00 a week and that does it. Even though the car has diagnostic fuel usage I dont bother looking,

here is a point, I have a class 6 engine in my VW. If I use Shell diesel within a few miles the catalyst light comes on and the book tells me I have to do at least 20 miles at 40mph to burn off the rubbish? If I use run of the mill Sainsbury Diesel, no problems. There is a price difference but it is lost by doing the 20 miles to clean the Catalyser unit.

Clive

Thread: Water in fuel
24/09/2019 14:12:20

One time I filled at a newly opened gas station, I use diesel, shortly I had engine problems and found that there was water in my fuel filter. I ended up buying a new fuel filter untit complete due to corrosin of the body inside.

Complaint to the gas stations just drew blank stares. Ever after that I had to have one of those fuel line filters which collected all sorts of muck.

Obviously not of much use to teh poster but as a source of water maybe.

Thread: What the he**
24/09/2019 07:55:08

I had a Ford escort front spring break where iit sits in the pan in the McPherson strut, they are colour coded so went to scrappy and found one of the right colour code and easily fitted it.

Oten when walking the dog I see bits of spring laying in the road and always on a roundabout, I pick up and dispose. 

Edited By Clive Hartland on 24/09/2019 07:56:13

Thread: Surface plates
20/09/2019 10:35:38

You would be surprised at how useful a surface olate is from scribing rising dimensions to checking flatness of parts being made.

I had a bronze casting and as I worked it it distorted and I only found it by using the plate and a V block.

If you have a Scribing/measuring device it is somewhere to store it ready for use.

Thread: Fiducial lines on a Zeiss Microscope Eyepiece
20/09/2019 10:31:27

There are many factors in Microscopy that are made for different usage, I have seen some where incident light use and reflected light so maybe a different focus there. My own use has been with reflected light looking at PCB's and the resolution is critical for dry joints in multi layer boards.

Sadly I no longer have contact with Leica since I left in 1999. I would think my contempries were no deceased.

It might I wonder if it to focus on meniscus plates where the focus changes through the meniscus?

 

Edited By Clive Hartland on 20/09/2019 10:32:36

20/09/2019 07:42:31

Fiducial lines are usually on the focal plane and appear on the negative or print for measuerment purposes, I wonder if the lines in the eyepice appear when used with a camera?

Thread: Petrol Gen for 7 1/4 locomotive
16/09/2019 21:55:35

One post mentions Hydraulic drive motors. A petrol engine driving a pump to drive the wheels, foolproof. No electricity, no danger wow.

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