Here is a list of all the postings John Haine has made in our forums. Click on a thread name to jump to the thread.
|Thread: Advice for a mini milling machine|
An Aciera would be ideal as made for your application, but haven't been made for years and expensive to buy.
the X1 is an excellent cheap'n cheerful machine but would need bringing up to a better standard for your target accuracy, a lot of work and time with uncertain outcome.
overall probably the Cowells is the best bet for a new machine, again targeted at your application, but it ain't cheap at the thick end of £2500 new. Or the BCA.
|Thread: Pendulum enquiry|
Take your pick.
|Thread: Why are CNC lathes more expensive than a CNC Mill|
Mach 3 actually does quite a good job of screwcutting with one pulse per rev, in my experience, provided you don't push the cutting depth too much. This is on my S7 with the standard motor at 215 rpm.
The old Denford Orac only had a 100 ppr encoder. You don't need direction as well because lathes generally only go one way and you will know which. You can use a quadrature pickup if you want to get double the pulse rate. but I don't know actually just how critical for example LinuxCNC is on rotational sampling rate. An alternative is a Hall Effect sensor on a gear wheel. So I don't think the spindle sensor is a critical cost element.
Once you have a source of spindle pulses the software takes care of everything, no additional electronics is needed.
I think the point about CNC being for multiple parts, made about both lathes and mills, is incorrect. Once you have a CNC lathe, you will use CNC for everything, all the simple jobs like turning, facing, tapers, curves, spheres, threading etc have wizards, you seldom have to write gcode, and of course once you're using cad/cam it generates the code directly.
It all comes down to supply & demand I think.
And of course if you only have an occasional requirement you can turn in the mill by putting the stock in the collet chuck and clamping tool to the table!
Lathe is technically simpler than mill, one less axis to control, but production volume is far smaller so costs have to be amortised over fewer sales. Worth looking at cncyourmyford for another approach. In industry CNC mills today do many of the jobs that would once have been done on a lathe. If you have a lathe why not convert that? I switched my Super 7 to CNC several years ago and don't miss the manual capability at all.
|Thread: What mills have you had|
First was an Amolco, made from an old head and a newer base (when they were available) - OK but not very rigid. Then inherited my father's Aciera F1 - a beautiful Swiss machine but rather worn and much too small. I sold that and invested the proceeds in a Myford VMB which gives good service. More recently bought a Denford Novamill for CNC which is also very nice though I had to make my own electronics package. Starting again I'd get a larger CNC mill.
|Thread: What lathes have you had?|
Hobbymat, Warco 220, now a Super 7 - latter much the best but if buying again would probably go Chinese or a s/h Denford Orac (since have converted S7 to CNC).
|Thread: Crystal Ball Gazing|
We had solar panels installed last November, with one storage battery. Since the spring essentially all our daytime energy has been solar generated, and the battery keeps us going into the night as well with lights etc. So my daytime machine usage has an energy cost of zero. Recently I finally turned off the short mains water heating top-up at night on E7, it hasn't made any noticeable difference, so our hot water is free as well at least in the summer. Even last winter we generated enough solar energy to make quite a dent in our normal usage.
So the answer to the original question is to have widespread solar energy and battery storage to meet domestic needs.
As for climate change, my own observation over nearly 70 years is that severe winters are much less common; and since 1976 many summers have been unbearably hot at times even in the UK. When we moved here in East Anglia the area was incredibly wet, now we have had a drought essentially for at least 2 years. I wouldn't bet against climate change being real - if it is the consequences for our children will be catastrophic; if we manage to take the right actions to avert it we will have a much more sustainable future.
|Thread: The Chocolate Fireguard as designed by Mercedes Benz|
|Thread: Further Adventures with the Sieg KX3 & KX1|
There are things you can easily do with a CNC mill that are next to impossible manually. For example, for my current Synchronome-based clock project I have cut a pallet to a mathematically defined profile that gives a "raised cosine" impulse force waveform; and an equi-angular spiral cam. For both the coordinates were calculated and the g code generated in Excel.
|Thread: An electrostatic mystery ...|
The problem with the "static charge causes travel sickness" theory is, how do you know you are charged when inside a metallic object? On the other hand, there is a lot of evidence for the placebo effect where an intervention that is thought to be beneficial has an actual positive effect.
When sailing in rough weather, one finds that going below often causes nausea from the combination of seemingly random accelerations sensed by the ear without any corresponding visual input. This explains Sam's experience navigating around London.
I read somewhere that the navy experimented with an "artificial horizon", that projected a band of light on the wardroom walls that was kept truly horizontal with a gyro, so that one had a constant visual reference.
|Thread: Myford Vice for Vertical Slide|
I assume (to repeat) it's there to avoid stress concentration.
Do you mean the small radius? I think it's there to prevent a stress build up if the corner was sharp. I've got used to putting a bit of packing in under the work.
|Thread: Forging brass; how easy would it be?|
You can search Google as well as I can, and it suggests that forging is a standard way of forming brass components.
|Thread: Myford Super 7 Spindle Lock|
This was discussed here less than a month ago:
This site's "native" "search this site" facility is C***P but Neil has added a very useful Google box on the site's home page - took only a few seconds to find the link I just posted.
|Thread: One Sided Fastener|
The mounting brackets for the "movable vehicle-activated signs" (a/k/a speed warnings) we use round our villages are fixed to speed limit sign posts using jubilee clips that have a 7-sided socket screw!
|Thread: Microns ...|
So do they make it that way as a joke? It may well resolve to a nm, If it could do it repeatedly it would be precise to a nm, and if it could be calibrated (e.g. w.r.t. wavelength) it might be accurate to a nm. But for its probably purpose, making comparisons, it's probably fine.
|Thread: What Did You Do Today 2019|
Nigel, that's exactly how they are intended. They are supplied oversize so you can turn the register for concentricity on your lathe. The same with the er40 one I bought from the old Myford with instructions.
|Thread: C section plastic extrusion|
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