Here is a list of all the postings Mick B1 has made in our forums. Click on a thread name to jump to the thread.
|Thread: Sharpening Lathe Tools|
I think I have too many to show the full selection, plus I don't always remember what they were ground for, except that sometimes it's easier to grind a new one than ferret through the whole bunch to find something usable for the particular feature being machined. They're all 1/4" square section, which I fiind the best balance of size and grinding effort needed for my Warco WM250V, and for the Myford Speed 10 and Emco Unimat 3 I had before that.
There's usually another form ground on the other end of those in the pic, but these are my most-used variants:-
Plain knife RH. There an LH one on t'other end. I try to keep 2xRH and 1xLH operational.
60 deg small screwcutting. Likely to have to work close to the chuck, so it's on that side of the piece.
Small parting and face-recessing. Tight radius clearance on chuck side. Might work for trepanning too, but it'd have a light radius on the front face if I'd ever used it for that.
Thread undercut tool for shouldered screw forms. Dunno if it's 55 or 60 deg or thereabouts, but can't imagine me making anything where it'd matter.
Small, medium and larger radius groove tools.
Hooky shoulder or thread undercut tool where room is very limited. Used it maybe a dozen times and it's somehow survived.
3 outside radius tools - middle one where central stem has to be kept, like on the little bronze peg-dolly drivers I put in the small toy cars I sometimes make.
Tiny bore finishing tool.
Of course, some can be used ad-hoc for other purposes - for example, the bigger radius grooving tool works nicely for facing too on most materials.
I try to keep one or 2 1/4"x 3" HSS blanks available in case of a sudden need for some form I haven't already got, or got something usable as a starting point.
IMO it depends on the work balance between grinding the tool anew and setting up the over-sharpened one.
If there's a particular form to the tool, like a specific radius or 55/60 degree screwcutting point, you tend to sharpen on the top to preserve the form, and that can make it a bit fiddly getting centre-height - unless you've got a QCTP with lotsa holders. Eventually you'll shrink the form through side clearance and have to regrind complete.
Knife tools made from a solid HSS blank, you can extend the cutting edge back and grind back the plan trail angle to match, so you don't lose top cutting edge height. Parting tools just grind the front face.
Edited By Mick B1 on 20/01/2022 15:32:24
|Thread: 'Vision aid magnifying glasses', any good?|
Yes, I think mine are this type too. Only the most powerful lens (3.5) appears to me worth using, so the others are already stored somewhere obscure. I use the elastic headband - the spectacle arms are useless.
The thing's a long way short of perfect, but well worth the modest purchase price.
Edited By Mick B1 on 19/01/2022 17:42:55
|Thread: Endless Repeats|
Maybe but fix it, don't trash it. I thought the same of the EU, but unlike the EU, the Beeb is Britain's to fix.
Edited By Mick B1 on 18/01/2022 17:29:38
Was there wine, music and dancing till the early hours?
Well, I think it's pretty close to what's happening here with commercial channels - it's why at least some of them are offering an ad-free service - of course for extra money!
I think the most serious risk associated with the huge variety of channels available now is fragmentation of culture. To some extent the limited number of channels in the 50s to 70s took the place of regular churchgoing, in that they provided a measure of common experience that members of a community could share and discuss on following days.
Now, with the huge variety of (generally speaking) low-grade programming distributing attention in such a dispersed manner, once you've sorted the weather, there's potentially nowt left to talk about to anyone not in your own interest group.
However we might change the BBC, I think we absolutely need a common cultural anchor or some sort.
Edited By Mick B1 on 18/01/2022 11:53:14
|Thread: What Did you do Today 2022|
Another clock converted to use a GPO slave movement for the railway. This was a Smith's Astral 123 with a very nice movement, I'd guess made 1950s - 70s, maybe in Coventry. The posts supporting the original movement had to come out - they were effectively riveted or bonded to the back of the face, so I needed to fill the resulting holes and try to match the face colour to cover the repair.
I gave them back the extracted movement. They might be able to sell it on via auction site - they seem to fetch a few quid.
Edited By Mick B1 on 14/01/2022 20:55:45
|Thread: 2000 Year old computer|
If it really is an orrery it's orders of magnitude more complex.
Plus it seems to me many of the descriptions may not have been realised in practice, and even then many are either single devices or sets of such in series, not multiple simultaneous calculators.
Fine precision geared mechanisms of this character would have opened up enormous possibilities for calculation which would certainly have been of benefit to those trying to calculate with Roman numerals of the time.
Edited By Mick B1 on 12/01/2022 23:04:58
It is indeed, and for me that makes it a bit of a pointless curiosity.
We seem to have no evidence of a development path, or any distribution or further re-use of its technology. Imagine how differently the ancient world might've developed if they'd had commonly-available and capable mechanical calculators, for example.
We might only be who, how and where we are today simply because that particular experiment went to the bottom before its potential could be recognised.
|Thread: Engineering as Art|
Wikipedia's comments on this biplane - especially the Operational History - say it all, pretty much as you might expect from looking at it...
When I was a tool draughtsman in the late 70s - early 80s I can certainly remember being impressed by the distinctive, fluent and economical style of some others in the game. Such drawings would also have to take into account the material types and dimensions most likely to be available to the toolmakers, which features would be most useful as datums, and what tolerances to apply where, in order to meet the limits specified for the component the tool was to produce. That can be where art and craft flow into each other - it could feel like the draughtsman was reading the toolmaker's mind.
Drawings for batch production, of course, have to take interchangeability into account, as well as potentially economy of material - they'd often be produced in full knowledge of the machinery and tooling expected to be used in manufacture.
Model engineering drawings don't really have these constraints or preconditions - the draughter doesn't know whether the maker's going to use a CNC machining centre, multi-spindle auto, a power-drill in a vice with a file, or anything in between. Interchangeability usually doesn't matter except where multiple examples of the same component are involved. So they're going to supply basic dimensions and leave the maker to determine tolerances and fits. Inevitably that means the maker has to do more brainwork and that can feel demanding and unfriendly. That was what I felt in my first ME projects.
Edited By Mick B1 on 10/01/2022 10:15:17
|Thread: Items which gave most satisfaction to make|
It's a Brontornis of the Miocene in S.America. Allegedly it was 8ft tall, weighed up to 350 kg, ran at 40 mph. and ate horses.
But it's away with the Dodo these days.
As for the babies SOD, I guess we may both be of an age where we're thinking one day they might be maintaining us.
Oh, and there's a hoop back chair I made on a course 9 years ago from sawn logs with pole lathe, travisher and steam box. I use it every day, and so do friends and family when they come. Nothing remarkable to look at, I hope it survives for many more years.
In my album there's a blued titanium light-pull shaped like a fish. I think it may be the only thing I've made that someone might pull from the rubble of future centuries looking much like it does now, and wonder who made it and why...
|Thread: WM250V Delrin Change gears|
Are you setting them with paper to get the mesh correct? My iron gears run with a pleasant hum, not uncomfortably loud.
|Thread: ANTIKYTHERA MECHANISM not the first??|
Thanks to Diogenes for saving me the trouble of looking up those links!
When I saw the thread title,it brought to mind things I've wondered about with the Antikythera Mechanism - where are its antecedents and copies? It's like finding the remains of a Mondeo where there's no trace of anything like an Austin 7 or a Model T.
|Thread: what happened to...|
I'd imagine there's quite a diversity of opinion on a site like this, and we've had warnings before from mods about contentious politics.
|Thread: Another temptation to Drive without due Care and Attention|
Activate the teleport module to take the turkey twizzlers directly from freezer to garbage grinder.
Save me the trouble of being sick.
|Thread: Is there too much choice?|
This thread risks political shutdown.
Many of us remember stories of pathetic incompetence, restrictive practices and excessive delays from the nationalised utilities of the 1970s, but the way to fix those would've been to resolve the organisation of those industries, not waste the consumers' time trying to strain a signal from the noise of a barrowload of endlessly churning suppliers.
Yes, there's too much choice, and it's our time that's wasted, and big advertising costs for unnecessary comparison industries are generated, which ultimately have to be paid for out of our bills.
Edited By Mick B1 on 01/01/2022 20:27:17
|Thread: Middle of Lidl|
I've taken a more careful gander at the 8mm drill in this set, and compared it with one in another set of 15 drills that Lidl also sell from time to time. I've come to place quite a bit of confidence in drills from the 15-piece set for most purposes.
The drill from the 15-piece set would just drag in my Mitutoyo (imperial) vernier mic at .3148" or ~7,9959mm, so it's around 0,004mm/1.6 tenths undersize.
The same-ish fit was achieved with the one from the 107-piece set at .3144" or ~7,9858mm, ie. about 0,014 undersize - say a bit over half-a-thou in old money.
I don't have a sufficiently accurate way to measure any point offset, but I'd think anything more substantial than a moonbeam at full eclipse would be enough to bring a resulting hole from solid up to size or a bit beyond.
I have to wonder whether these may actually be repackaged seconds from the 15-piece set. I'd think they'll be ok for most purposes except for use as Dagenham reamers in holes designed for tight-limit dead-size pins or dowels.
|Thread: Do you "still" enjoy driving?|
For me it all depends where I am, why, and how much time I have. I can remember very unhappy journeys when much younger, driving to see an ill-natured and demanding software customer (my job was implementing sales/inventory/purchasing/manufacturing systems), but also perfectly relaxed trips where I drove a 400+ mile roundtrip and delivered 6 hours training or data-conversion work in one day.
It's true the roads are busier now and very many businesses are operating on tighter just-in-time schedules than they used to, but there are still times for an easy cruise down the motorways.
Being older, I find the country roads harder work now...
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