Member postings for not done it yet

Are you climb milling?

Perhaps you did not understand this question from my earlier post. Small mills are not best suited to climb milling. The heavyweights can cope with that cutting direction and cutters should last longer (as in doing more useful work), but we tend to only climb mill (on hobby type mills) when cutting tiny slither to make the finish as good as possible.

Glad you have had some success. Now consult the feeds and speeds info for other cutters and material combinations.  Basically the same whether milling or turning. But err on the conservative side as these values are often quoted for production work where the tool (HSS) might be expected to last for an hour at the maximum depths, feeds and speeds.

Remember, too, that even though a cutter should last some time (more at conservative speeds and feeds) they can be rendered useless in just a few seconds of rubbing, overheating or plain mechanical abuse.

Edited By not done it yet on 11/11/2017 18:12:12

Have you changed the jaws into different positions? Can make a big difference which slot jaw no. 1 is fitted into.

Is the chuck running concentric to the spindle, if you have a back plate? Or is/are the register(s) clear of any burrs or contamination? Even the spindle may have some run out.

What I am saying is that it may not be the chuck which is at fault.

Also, the run out quoted by RDG was for the collets? The whole system may not be as good as that (should be better than 7 thou, mind!).

I supported the bar with the tailstock, turned it round at both ends, sufficiently wide for the steady rest and space for a clock gauge. No problem when turned around - true it up in the 4 jaw and clock it in at the steady-supported end (less tailstock support now, of course). Job done.

Do you firmly lock down both x and y axes when plunging, or both the other axes when traversing cuts?

I would suspect that a basically free-standing situation is not helping either.

Is your stand construction sufficiently rigid?

How are you plunge cutting?

Are you climb milling?

Cuts have 3 dimensions - depth, width and feed rate. 30 thou should be easily accomplished but it depends on the other two dimensions as well as the material being cut and cutter size and type.

Do you use cooling or cutting aids?

I would expect, given suitable combinations, that you should be able to absorb most of the available motor power - but that may be reduced to take into effects of wear. A compromise, as always.

Giving more explicit examples would help the dignosis of your problem(s).

Hacksaw,

I have made umpteen thousands of shotgun reloads and fired thousands of rifle rounds. The primer of David's was dimpled (quote: "plus mimicked a fired primer in the base." unquote), yours was not. Rounds of that size might be acceptable as models, but smaller calibre rounds could look authentic. Could result in getting a firearms response team on the scene these days.

Would finishing with a D bit achieve a reasonably flat bottomed hole, after using a milling cutter? Seems the best solution to me.

Why a fired primer? Usually there is only the case left after the primer is fired. Is it a 'legal' requirement?

I sm sure that nuclear gets paid at the going rate, depending on demand. If, at night, when demand is low, nuclear will be paid rather less than at peak periods. The only difference with nuclear is that they will sell at any price,in the short term, rather than curtail generation. The pumped storage operators most certainly take advantage of the cheap night tariffs, for instance.

Most wind curtailment is simply down to feeding the power in at the 'capillary' parts of the grid, rather than into the 'arteries'.

If it were used locally, t

here would be less curtailment but (as above) transmitting huge amounts from a wind farm may overload the grid at the periphery - until the grid is sufficiently reinforced. The National grid have to prioritise where they make improvements and they will accept the curtailment costs because they have worked out the cheapest route to grid reinforcement.

Unfortunately joe public don't understand the financial implications and are misl

ed by newspaper headlines that are often politically, or otherwise, motiva

ted.

Tim,

Not unless Malta (or Wales) has moved!

A bigger mill is not an option I'm afraid!

Make or purchase a taller raising block instead!

If you could arrange for a short 2MT drill, they could also be drilled horizontally. It won't help now (a short 2MT drill should suffice as you are), but if your disc happenned to exceed Centec throat depth, the disc could be up to twice the listed horizontal clearance?

A location might help, as you might live close to someone with a taller riser block.

Stuart,

The lathe can be operated manually (no theading or power feed) but in this case, with the apron jammed, that would be unwise without sorting out the reason for the jamming. Unfortunately, some might mean fitting a non-shearing item in place of the shear pin. In that case the lathe would cheerfully go on operating until a jam occurs, but this time much more damage to the gear train would likely be the result. There may be a bent shaft in Brian's apron which is preventing much movement in either direction of turning.

Arceurotrade? But you would have to settle for ER32.

Edited By not done it yet on 09/11/2017 08:08:54

John gives good advice.

Regarding level, the lathe could be at 45 degrees as long as the bed is 'level' from one end to the other!

If the bed were true and flat and level, the lathe should turn without taper - but conversely, if the lathe cuts without a taper, the bed should be true (even if not quite level in the absolute sense) This means that shimming of the tailstock end, to remove any taper cutting should level the bed.

Obviously, levelling the lathe initially is a good ploy, but things like the floor or bench/stand top can also introduce extra levelling requirements. I expect that shimming the tailstock end (if the the root cause of the problem is pinned down to a slight twist of the bed) would be more than adequate for our small lathes.

Have they crashed yet? Sounds a bit like pyramid selling to me!

What about the haulage industry - not a lot seems to be said about electric trucks.

Fear not, here are a couple:

https://www.daimler.com/products/trucks/mercedes-benz/mercedes-benz-electric-truck.html

https://techcrunch.com/2017/11/06/tesla-electric-semi-truck-reveal-confirmed-for-november-16/

BYD have their truck operating for Loblaws in Ca. There are reports of a fleet of light trucks operating in California. The Swedes/Norwegians have their eclectic 'trolley bus' type trucks operating on a stretch of road gitted out with overhead conductors.

There are doubtless other developments which are likely found with a suitable "goggle", or similar, internet search.

(Edited to add the merc link)

Edited By not done it yet on 08/11/2017 16:39:43

Mike,

Gridwatch is a good indication of leccy generation types. Coal fired generation has been zero on numerous weekends over the summer.

But hydro output is also shown. Many smaller hydro plants run at reduced capacity because the income is higher than running at maximum possible (they get bigger subsidy payments if below a certain power - stupid, I know, but fact!)

And they are not building any more rivers, either - again most of the hydro is from smaller almost run-of-river sites, where the head is not particularly high, I believe.

There has been a scheme proposed, which would cost billions, to provide storage for umpteen gigawatt hours of storage, so that more renewables could be used to pump water to the installation as an energy storage medium....

They are putting in some new hydro above Drumnadrochit using some of the water which would go over the Divach Falls, I believe. Seen the access tracks but I can't remember the size of the generators. So, yes, they are installing extra generation, where economical and when funds permit.

If the OP had set his question as simply 'which material is best? ' rather than 'is brass best? he would have received better replies.

A bit like 'is carbide best?' for cutting tools rather than an enquiry as to which material is best. Often 'horses for courses', so no best for all situations.

Of course it is possible. Just that one would need to convert the metric requirements to imperial measurements if one wanted to use the scales on the machine slides. One can measure a length (or any other dimension, for that matter) in any chosen units. It is internationally accepted to use S.I. units these days. Only the USA and a very few other places continue with non-metricated units - but there are a lot of lathes, etc, still around with imperial scales, and quite a lot of the older generations still stuck with the old system (even personal height, weight measurements by younger people who don't actually learn the feet, inches, stones, pounds and ounce systems at school!)

It is interesting to note that final sizing is normally measured by a separate instrument (micrometer) and these are at the choice of the user. Even if using a dro, measurements of items produced will still be checked at least occasionally by micrometer, etc.

One good reason for modellers, making items faithfully to scale, is that the orignal '12" to the foot' models were all made in imperial units in the UK, and there are easily scaled (in the main) to 1/2, 1/3, 1/4, 1/6 of the original.

Even the american system is usually worked in thousandths of an inch, even if they start out a 1/4, 1/8, 1/16, 1/32, 1/64 etc!

there is no advantage to the undercut.

Unless wanting to mount a square item to machine on one corner...

Steamdave,

You might have forgotten that leccy cars can use zero power at standstill. If they can charge at 20kW while traveling at 70mph, I'm sure they can charge at 10mph, or even stationary.

Do think before being so negative!

Samsaranda,

I didn't mention any timescale. All I said was basically oil is a finite resource - it WILL run out, sooner or later. By then there may be other means of cheaper transport.

A dedicated lane on a motorway for all suitable vehicles, kept in lane and a fair distance apart, at high constant speed is a future possibility. Danes or Swedes were testing overhead pick ups for trucks on one section of road andwe already have pilot schemes for one truck driver and a couple of slave vehicles following behind.

Developments are taking place in many places over a range of future possible options.

One thought was that the next oil, produced by the planet, might be derived from the human race and its herds of animals! Although I doubt there would be sufficient numbers dying only in one area to make any appreciable amount of oil in 100 million years time! (No oil from the dinosaur extinction as far as I know) And the human race will have deserted the planet long begore then!

There is always the promise of boundless electricity generation from nuclear fusion reactors. Of course, that dream might come to reality in the next few decades.....Flying pigs and cows jumping over the moon on past promises, but they are getting nearer with developments, and have run a reactor for a finite time while actually producing more energy than it consumes, so progress is taking place.

Still makes no odds on the cost of a litre of petrol or diesel, mind...