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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: Does a particular thread hold better into brass
13/01/2020 12:07:08

Thiis is of interest to me, in my work as an Inst. tech on Theodolites. We had a spate of heads popping off of screws and the investigation found that the materiel was not to spec.

It would seem that the screw thread if subject to high torque will pop off. So, using perhaps a Metric fine thread and not subjecting it to a high closing torque would be fine. I do not see coarse threads in 1/8" brass as stronger than a fine thread. One example is Aluminium used in AFV's where the threads to hold exterior items are drilled to take stainless steel helicoil type fittings locked in placed by driving in pins to stop them unscrewing. I think it depends how often it is intended to overhaul and unscrewing the item, if once in 29,years OK. but if it was once a month then use a helicoil.

Thread: Australian Bush Fires
11/01/2020 07:47:53

It is well documwented that Australian Flora needs fire for it to propagate, seed pods and other seed dispersion. There are now pics. on the Media of new shoots coming from burnt trees and no doubt seeds will germinate when rains come.

What is a tragedy is the wildlife, Koals and Kangaroos a bit singed and now having no source of food or water. Nor a nice tree to sit in and eat the leaves.

Pics. of Koalas begging water from passing humans is tragic. Birds can move away from damaged areas but mammals are stuck in the areas they live in. I wonder if any Cane Toads were caught in the fires?

Thread: soldering stainless steel
09/01/2020 13:16:17

I have found that soft soldering on thin s/steel makes weak joints. Having to go back over it later. Etching flux essential, take care it will burn you!

Thread: Watch servicing
05/01/2020 16:25:14

Servicing a quality watch is fraught with problems, I have an Omega Seamaster automatic. and after about 40 years put it in for a service. Damn, £120 and they ruined it, they lost the screw that adjusts the advance and retard lever. The movement was covered in scratches, The watch before service was pristine but on return was losing 15 secs a day.

Sent it back and they fitted a definitely too big a screw in that lever and wanted to sharge me £40 for a replacement dial at a discount. I do wear it but it is not the same as it was.

The big watch makers are curtai;ling the spares for quality watches. I also wear a Tag Heuer but find it heavy on my wrist. Value about £1500 but to look inside does not seem value for money but it does run for 3 years on a battery.

My daily wear at the moment is a manual wind Omega Chronostop which is some 50 years old and never yet serviced.

I see now that they are promoting army service watches, Cyma and IWC, maybe Omega too. always stood the test of time and while serving never had a duff one. As an Inst. Tech I always found my way to the wattch repair section in the army repair shops just to talk and watch what they did. I learnt a lot from them.

Edited By Clive Hartland on 05/01/2020 16:27:31

Thread: Correct use of slitting saw for deep cut.
30/12/2019 08:39:10

For deep slots I alwayys cut a guide slot about 1mm deep, this seems to stop the saw from wandering out of line when going deeper. Use coolant and not too fast.

Thread: Win10
22/12/2019 17:55:52

When we were able to download Win10 as a test I decided to stay with Win 7. I am not sure if the Win 10 software was deleted or stored on the PC.

As I am now getting warnings that Win7 security will stop in January I would like to know if Win10 is still in the PC. I do not know where to look for it if it is?

I seem to remeber at the time something being stated that it was not deleted.

Thread: Nalon Viper
22/12/2019 10:20:37

Many tears back my two main engines being a Dooling 29 and a McCoy 29 which I used for all of my control line racing. Both had plain crankshaft bearings and I could get 18000 rpm with a smaller prop.

If there was a pile in it was always straight in on the prop and crankshaft which never seemed to bother them, I never bent any crakshafts even on smaller engines. In fact the only damage I did was to an Amco 3.5 which snapped the gudgeon pin which I replaced quickly with a bit of a 1/8" drill.shank. That engine powered a 'Powerhouse FF which had a 5 sec run.

Thread: Bandsaw woes.
19/12/2019 07:02:43

When cutting Alu. on my saw I run a piece of Bees wax along the line which seems to ease the cut.

Thread: 2nd Hand Hearing Aid Reprogramming?
18/12/2019 15:11:14

Optical spectacle lenes are big business, the larger optical grinding companies grind a series of lenses in all powers and strengths and these are delivered in a, 'Round' shape and the optition will grind them to the patients requirements. A one off job does not pay and sadly they look at you, the payee as a goldmine.

Of interest the round lenses are costed at about £1.00 but when worked, zoom up to £300-£500 depending on what spec. you want or need.

In reality best to buy a new pair to suit your requirements.

Thread: Wobbly Kitchenaid Mixer
17/12/2019 07:14:44

Nail varnish, degrease parts first.

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 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.

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