Here is a list of all the postings SillyOldDuffer has made in our forums. Click on a thread name to jump to the thread.
|Thread: Milling - Turning Axis Wheels the Wrong Way|
I'm building the Jan Ridders Coffee Pot Stirling at the moment. Although my self-taught skills have improved considerably I am still in the bottom 10% of the class when it comes to finish, and I'm trying to improve.
I generally manage to put holes in the right place, turn to wanted diameters, and mill to the correct depth, more or less. The things I make usually work but the finish is poor. (This is not false modesty!)
One of my mistakes is that when starting a cut, or changing direction, I have a strong tendency to turn milling table axis controls the wrong way. This drives the cutter into metal that has to be left untouched if the object is to look good. Quite small errors can spoil an otherwise acceptable bit of work.
This picture is a close-up of the flywheel. You can see that I have crashed no less than three times into this particular spoke. It is very annoying because the other 5 are quite good, at least by my standards!
I feel like a learner driver having trouble with parallel parking again. My confusion is something to do with reversals of right-left and forward-backward movements, and ditto with my rotary table. (I usually get up-down right thank goodness!)
Is there a trick to this like "lefty loosey, righty tighty" or is it just practice, practice, practice? All hints and advice gratefully received.
Edited By SillyOldDuffer on 15/02/2016 18:26:01
|Thread: Dial Indicators|
I'm no expert but I always thought that the 'shall' wording was just standard commercial contract speak used to express requirements, though like John my experience is software related too.
I used to be in a team that wrote Requirements for hardware, software and services. The form was to specify essential requirements in the form "The widget shall be pink." This would be issued to industry who would reply with a compliance statement like "The widget will be pink". If the price was agreeable a contract would eventually be issued in the form "The widget must be pink." and this would be legally binding.
The purpose of this rigmarole was to allow clarity and agreement to be negotiated before finally committing to contract. The specification of a large IT system can contain thousands of individual requirements and it pays to get good agreement between customer and provider up front especially where sub-contractors are involved too.
Words become seriously important when a contract is in dispute. I once spent over two hours arguing with a supplier's lawyers about the contractual meaning of the word "all" and lost the common sense argument because poor wording in another part of the contract accidentally contradicted the usual meaning of "all".
My feeling is that chaps using machines to make real things have much more fun in their work than us poor s*ds in offices!
One of my books contains this advice about Dial Indicators. "When using a dial indicator on a surface plate for accurate measurement of gauges and fixtures, it is quite a good plan to tap the table or plate with a hide or rubber mallet when the indicator is set and just before taking the reading. However good an indicator is being used, there is always the possibility of a certain amount of "stiction" (a modern colloquialism) in the movement, and the vibration thus set up tends to make conditions more or less uniform for each reading"
So there you have it: the cure for a sticky dial indicator is to hit it with a hammer.
By the way Sulfer has been the correct UK spelling since 1992. Please don't shoot the messenger!
Perhaps I do understand it after all then!
It just goes to show how careful you have to be about the written word. English may be a great language but it's all too easy to trip over shades of meaning especially when words have both lay and specialist meanings. Like Energy, Force, Work, and Power for example.
You'll have to forgive me. I come from a profession where "Entity" as in "Entity Relationship Diagram" can be defined as being a "thingy"...
Oh no, just when I thought I'd understood it!
Although Collins dictionary could be dismissed as non-technical it's harder to ignore JCGM 200:2008 which is the International Vocabulary of Metrology. I think this supports Anna rather than Neil.
closeness of agreement between a measured
NOTE 1 The concept ‘measurement accuracy’ is not a
closeness of agreement between indications or
NOTE 1 Measurement precision is usually expressed
This history and practice of metrology is a fascinating Anna : I'm amazed Neil hasn't asked you for an article (yet)!
Edited By SillyOldDuffer on 11/02/2016 21:45:30
|Thread: Home workshop org gone?|
AVG won't cause certificate problems. It's OK to use it.
If only one site is causing certificate errors then the fault is at their end. Don't trust the site until they fix the problem.
If you are getting certificate errors from many different websites then a common cause is that your computer's internal clock is wrong, probably because the BIOS battery is dying. Although the clock should be automatically corrected by an internet time server there will be a period during which strange and confusing things happen. The clock goes wrong again when the machine is switched off.
Edited By SillyOldDuffer on 10/02/2016 21:39:35
|Thread: Use of domestic room as a workshop|
My sister found swarf in her lasagne at a do I was hosting. Now the whole family carefully inspect everything cooked by me.
I have a garage workshop separated from the kitchen by a utility room. Swarf gets out despite mats and regular sweeping. You can make domestic mess even worse with bad luck or stupidity. The black dust caused by me cutting through a hard block of cast iron with an angle grinder went all through the house.
My bedroom workshop is excellent for clean lightweight hobbies but they aren't as much fun as metal mangling!
|Thread: Small easy project|
Very nice! I wonder how many people will be inspired to make their own?
|Thread: Daft question (maybe)|
Well, these people seem to have some good stuff...
Seriously though, modern machine tools have largely displaced the type of lathe most useful to hobbyists. We have good reason to be grateful to anyone prepared to cater for our needs. And of course many of us have benefited from the ready availability of classic tools made redundant in Schools, Colleges and Industry by progress in mainstream manufacturing. Buyer beware though, some of these classic tools are lemons!
My feeling is that "China bashing" simply discourages and confuses newcomers to the hobby. By all means buy second hand If you know what you're doing, but please don't put new friends off by rubbishing the alternative. Comparing a high-end industrial machine picked up in good condition for a fraction of its original cost with a tool designed to be affordable in the hobby market is hardly fair.
Far Eastern lathes and mills may not be the best possible but they are certainly "value for money". Whether they are also "Fit for Purpose" depends on what you want one for.
My own experience with Chinese tools has been positive - they've been nowhere near as bad as I was led to expect by the critics. All of them worked out of the box, all of them benefited from some fettling, and all of them have shortcomings. But I've learned a lot by using them and have had no reason to regret my purchases.
|Thread: Small easy project|
Thanks Lars_G and Hollowpoint. Much to my surprise given the Japanese origin I think Hollowpoint has nailed it!
Wikipedia says that the British bought 150,000 Arisaka rifles in 1914 and used them mostly for training. "The 6.5×50mm round was subsequently produced in Britain by the Kynoch company and was officially adopted for British service as the .256-inch (6.5 mm) caliber Mk II in 1917."
I think this example of Trench Art probably came from a Training Camp. I now doubt it was made in the front-line as I'd previously believed.
The item works well as a pen-knife and although easy to make must have been a desirable novelty. I wonder if the Swedish examples were manufactured by Mora and how many other nationalities have produced them?
On the subject of trench art can anyone identify the cartridge this penknife is made from? It was given to my grandmother by her brother who was killed in France in 1918. I expected it to be a British .303 but the dimensions are all wrong. Nor is it the standard German calibre. A friend who knows a bit about guns thought it might be Italian except that their bullets were rounded rather than sharp tipped. And I can't think where my relative would have got hold of Italian ammunition during WW1.
Dimensions are approximate!
Thanks in anticipation,
|Thread: Taper turning. (offset attachment)|
Much depends on the lathe I think. It was easy enough to get the razor blade right on my old mini-lathe until the adjusters were tightened to fix the setting. At the last moment the tail-stock would describe a small figure of eight around the headstock axis. Getting it spot on could be quite a fiddle!
As to cause, the innards of my tail-stock were a bit rough from new and I suspect more expensive lathes might develop similar symptoms if damaged or worn.
|Thread: Bending steel|
Closer inspection reveals that the wire globe is made from two hemispheres bolted together. I'm entirely ignorant about such work, but couldn't you rough out a half-sphere template from stacked discs of wood and bend the wire around nails banged strategically into it?
You can buy old-style filament bulbs in the UK for decorative purposes. I can't remember where I saw some on sale recently but it may have been B&Q or Maplins. But they're on the web too, LINK .
|Thread: Anyone know more about these modules?|
As they are so cheap it might be worth buying one in the hope that the underlying chip is marked and its datasheet can be looked up.
The functions available through the interface may be more comprehensive than you expect. For example, this TI chip uses an IC2 serial interface to adjust lots of parameters so that the charger can be optimised for particular batteries.
Please let us know how you get on. It looks like an interesting module.
|Thread: Checking runout|
Mea Culpa Rod. It seems that it's not only our American friends who don't get irony!
I think the Mackay of the poem must also be the author of one of my favourite books - "Extraordinary Popular Delusions and the Madness of Crowds". I like the works of the "real" Tubal Cain too.
|Thread: Small easy project|
It's clearly a Model Engineer's notion of the perfect wedding ring. I claim my prize please!
|Thread: Checking runout|
Sorry to be a pedant but Tubal Cain is in the Bible: he's the first metalworker.
|Thread: Miniature tools|
Very nice! Pics like this make it obvious that I need more practice though. Perhaps a lot more...
Congratulations on the bronze,
|Thread: Old PC Linux|
I'm sure you're right as it's a couple of years old. It was the most recent comparison I could find on the web (using duckduckgo). Are you able to provide a link to a more modern one?
With respect, the statement that Mint has a "much friendlier user interface" than Ubuntu is more a matter of opinion than of fact. The Unity desktop is certainly different, but it works well and has advantages. Here's a fuller comparison between Ubuntu and Mint.
Although I happen to prefer Ubuntu and Unity I wouldn't knock Mint. Mint is definitely good news if you like things to be familiar.
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