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Member postings for Danny M2Z

Here is a list of all the postings Danny M2Z has made in our forums. Click on a thread name to jump to the thread.

Thread: Bulbs Electric Life of
25/07/2020 11:11:27

Here is an intresting thread about light bulb history Light Bulbs

Thread: Aircraft General Discussion
24/07/2020 04:02:15

Qantas just pensioned off it's last 747 to the Arizona graveyard.

After 50 years in service the fleet is being replaced.

The flight path of the last flight over the Pacific Ocean was most interesting. (Tracked on FlightAware)

* Danny M *

qantas 747 last flight tracked on flightaware.jpg

Thread: Overseas Distribution to restart
21/07/2020 08:54:02

Thanks Neil for hanging in there during this serious disruption and thanks to your publishers and distributors for doing their best in 2020. A year that shall remain in history!

Thread: Is this a plug tap
20/07/2020 06:44:26

I have set of Sutton Tools (Australian) B.A. taps. Each size came in taper, intermediate and plug sizes. The plug (2 black stripes) have a square cut end with a minute tapered section.

What I did find interesting is that the diameter of the threaded sections gradually increases from the tapered to the plug version so that when changing from taper to intermediate the tap will cut the previous thread a bit deeper.

Quite useful if one is tapping a 'tight' thread such as for a model diesl engine compression screw.

For tapping a blind bottomed hole the pointy ones look a bit useless.

* Danny M *

Thread: The 2038 computer bug
14/07/2020 11:19:01
Posted by Speedy Builder5 on 13/07/2020 16:24:42:

+1 for Brians comment. There is no way a 2 digit date was going to work correctly on Jan 1st 2000. In fact it stopped working long before that for forward order dates, end of guarantee periods etc. Young uns can't comprehend how expensive disc storage was back then, the tricks we had to use to minimise data sizes, the processor speed (Or lack of). I remember that a 16Kbyte core memory board cost about £8,000 in 1975 and our machine was a 32Kb one but in spite of that, we ran the complete stock control, BOMs, purchasing and spares and rectification system for CINCINNATI Milacron UK. Our total disc storage was 48Mb which was production, development, operating system.

Lol, you were lucky.

In the early '70'sI worked with 1965 technology magnetic drum memory systems that were used to compute the parabolic flight of a projectile, a mixture of valves and an early version of a transistorised computer used to drive me crazy debugging the faults, but when it worked the operators were very happy.

The drum had enough memory to store azimuth, elevation and bearing data points for a single radar tracked projectile which were then integrated to plot the origin or the destination using fixed constants for gravity and air drag. We were told (1974) that a replacement magnetic drum unit cost $120,000

On a good day, the people firing the projectiles could be located to within 30m at 10km range so were not happy when a quick CB return fire of airburst arrived over their location.

That was a long time ago but it's factual and it's history.

* Danny M *

12/07/2020 10:08:51

Just like the millenium bug was hyped this new vision has surfaced. 2038 bug

Just like the millenium bug I presume that some people shall try to profiteer from the hype, but then I wonder how many operating systems shal be 32 bit in 18 years time ?

* Danny M *

Thread: SX1 Mill Motor Shaft
09/07/2020 04:53:32
Posted by James Dickie on 08/07/2020 21:02:18:

If you would like an easy route to a belt drive conversion, then I can highly recommend this one:


That's quite a useful linky as they also offer conversion kits for other mills (such as my X2).

Thank's for that.

* Danny M *

Thread: Ultrasonics and citric acid
30/06/2020 08:41:22

My ultrasonic cleaner has a stainless steel tank and I regularly use a solution of citric acid in it to clean used brass cartridge cases before re-loading them.

The results in 10 minutes are better than when I previously used a vibrating tumbler full of crushed walnut shells running for hours. After use I flush the u/s cleaner tank with tap water and it's still working well after 6 years.

* Danny M *

Edited By Danny M2Z on 30/06/2020 08:41:58

Thread: Harold Hall basic grinding rest
29/06/2020 09:14:56
Posted by derek hall 1 on 29/06/2020 06:38:19:I wonder if the problem exists if the ball is metal as in Danny's example.

My table has never moved during use. As Neil pointed out, the grinding forces are small.

The mounting board has two threaded inserts so that the rest can be fixed repeatably in the same position.

If you noticed the protruding bolt to the right of my grinder that is for the drill sharpener (same reason).

The metal ball was from a friend who's son managed to crash his car so might be easy to pick one up from a car wrecking yard. The spigot was a useful bonus.

Magnetic mounting seems nice but how does one assure positioning repeatability and what happens if the tool being ground digs into the grinding wheel?

* Danny M *

28/06/2020 03:30:56

I made my version about ten years ago and it's had regular use for producing the cutting edges on lathe tools and sharpening end mills.

I had didfficulty locating the plastic ball so used a donated steering ball joint. This had the advantage of a spigot and might last longer than the plastic ball.

I keep a soft brush nearby as the grinding dust gets everywhere. For that reason I do not use oil for the sliding/pivotting parts, powdered graphite works ok.

* Danny M *

rest 1.jpgrest 2.jpg

Thread: What Did You Do Today 2020
23/06/2020 11:58:48

I just finished three books in two days.

That's a lot of colouring in ;-(

Thread: Recommendations for where to start with my new Emco Unimat Basic SL
20/06/2020 09:28:59

Many years ago (about 1980) I visited the home of a very competitive aeromodeller friend in Brisbane, Australia..

In his "office" was an EMCO Unimat lathe that he used to produce spraybars and other sundry parts for his models and engines.

Thus impressed I decided that a small lathe would be a great asset and a few years later managed to pick up an original Australian Sherline lathe (complete with brass bed and heaps of accessories).

Thus I was hooked

* Danny M *

Edited By Danny M2Z on 20/06/2020 09:30:06

Edited By Danny M2Z on 20/06/2020 09:30:46

Thread: Stuart 10V Build Log - Complete Beginner...
20/06/2020 08:17:53

For a beginner this is an excellent build log.

Thank you very much for posing all the details Dr_GMJN

BTW, I often use a slip of paper between vice jaws and the work. Not so much to protect the finish though as it really improves the grip between the components

* Danny M *

Thread: Can summer car tyres be used in winter?
18/06/2020 07:22:15

Once you get the car moving and the tyres warm up the what's the difference?

Touch your tyres after a trip, they get quite warm.

Only difference that I can see is deeper lugs on the treads to handle snow (it actually does snow here in Australia) so when I visit alpine places it is mandatory to fit "Snow Chains" if I wish to go fishing at Rocky Valley dam. Rocky Valley

More important IMHO is to change the engine oil to a winter grade to handle low temps (check your service manual).

* Danny M *

Thread: A very nice 2.5cc control line speed engine
13/06/2020 09:16:56

Thanks for the info Barrie.

So, ceramic bearings or steel balls?

ABC or ceramic coated liner?

Enquiring minds need to know

* Danny M * (aeromodelling tragic)

Thread: Coronavirus
12/06/2020 10:10:41

Not a popular topic but the dreaded pox is still here so here is some news from the Pacific.

Kiwis are doing well and we had a footy game in Oz. **LINK**

Best wishes to all the forum members so please stay safe and well.

* Danny M *

Thread: Drill sharpening?
12/06/2020 02:38:28

One of the best attachments that I made for my Picador clone was a Harold Hall inspired attachment to ensure exactly 180° rotatation of the drill bit being sharpened.

Details are contained in this excellent book which should be considered as a useful reference for model engineers. Tool and Cutter Sharpening

No affiliation, just a satisfied customer/reader.

* Danny M *

Thread: Compressor inspection
09/06/2020 09:31:33

I asked this question many years ago but don't recall getting a satisfactory explanation.

Why is the compressor drain valve located about 10° off from the bottom?

I have to tilt my el cheapo compressor to get the last sputters of water out from the valve.

Obviously there is a good manufacturing/scientific reason for this but it escapes my logic ;-}

* Danny M *

Thread: How to glue plastics
08/06/2020 10:18:17

I have had quite a bit of success with this when I built a model box from Corflute plastic (same stuff that is used by pollies and real estate agents for signs) Plastic Adhesive

It actually worked better than my dubious expectations and it even managed to bond the Corflute plastic to aluminium channel. I did a few tests for peel and shear and was quite impressed that something actually performed as advertised. The instructions on the package were followed scrupulously btw.

I am in Australia but surely you have an equivalent in the U.K.?

* Danny M *

Thread: Tailstock die holder
08/06/2020 03:04:35

Here is a sliding die holder that I made. The body slides on a steel rod that is held in the tailstock drill chuck.

It was easier than turning a M2 taper and permits it to be used in my mill.

I added the (weak) spring to help it along but not sure that it really needed it.

* Danny M *

tailstock dieholder - 2cs.jpg

tailstock dieholder - 1s.jpg

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