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Hi!
My English is a somewhat limited, but I will give it a try…
First of all, imagine a longer rubber band fastened at the bottom of the tower, let it loop trough a wheel as high as possible at the...

On a tight budget? As a first project I tried the combination of steppers from old floppy drives (5 1/4 “) some ULN drivers and an old PC with a parallel port. Software from www.dakeng.com was the...

Alexander's 3 axis pic step controller??? Never heard about it. Got a link?
/jan

Right Lew, the dew point was the word I was looking for. See, my English wasn’t that good after all...
You know the problem of changing temperature, so does Handlewank, but I wouldn’t go for his...

Rusty tools isn’t funny, they look bad, behave bad, and the oxide at cutting edges is damaging the tools. Florida you say? Hm. I’m in Sweden (at about the same latitude as Anchorage, Alaska) but I’m...

Hi Mike!
It will probably be a noisy little machine with all that sheet metal surfaces :-)
–not a big problem though, it can easily be solved. I like your work Mike and are looking forward to see...

Hi Joe!
It looks like a nice device you are building.
I started a similar project years ago and I’m still banging my head against the Z-axis. Can’t find a simple and sturdy solution that fits...

There is a somewhat tricky way to make a choise...
Any body can dissipate a certain amount of heat. In this case I would guess a few Watt. That is however a guess, and the desission to follow my...

It's a small device, thats for sure. It doesn't look cnc but I like the digital scale on the side...
Anyone else out there who can give me an idea about a real small cnc?
/jan

Anyone built a really small cnc mill, router or lathe?
I mean a really small one where a small Emco or whatever is a giant?

If you want to see some advanced hobby engine, built by a "hobby pro", with parts partly cnc-machined you can look at this guy: http://fly.to/orkenrud
Just if you ever doubt that the sky is the...

Perhaps this link can help:
http://www.cnczone.com/forums/showthread.php?t=14228
(I don't know if the link works...)
I'm mot sure if it is much less rigid
/jan

Must it be two parallell linear bearings? It is almost impossible to get them perfectly parallel to avoid forcés built up between them. Using one good linear bearing and a simple flat iron guide with...

If you want to try CNC ina small scale I would say go for it. My first system was build on that device. The steppers I used came from 5.25" floppydrives. I cheated a lot there. I made a rigid...

Well, you can try looking at a "pancake dc motor" but personally I would opt for a much smaller and not so heavy high frequency motor with very high rpm (+100000) then you can get 50kW out of a few...

You are right about helium and it is used in the most efficient Stirlings. Helium is also a very small gas molecule that has a low mass and moves very fast. The other heavier gases mentioned in the...

They sure don't need to be simple. Our Swedish navy use them in their submarines and those engines are very complex, but the original sterling engine is very simple as is e.g. the more complex...

Sorry if I stepped on someone’s toes - not my intention. Promise :-)
What I was thinking of was that I have seen forums and pages dedicated to Stirlings. One of my friends built one after getting...

I like it and I want to ad that it is possible to cheat a little more. E.g. you can make the table let’s say 300 mm, keep the rod just above 600 and put a support in the middle under the rod. By...

You are right, Stirlings are not IC (Internal Combustion) since the heatsource is outside the engine it selves. Neither are they to put into the category of steam engines since they don't invoke a...

More poles? Hmm... Weel you can actually get an indefinite number of "poles" by skipping the rotating iron and let the magnetic field rotate and "drag" a drum of copper around. It only takes very...

I don't really think it matters. So many parameters are involved regarding stability that you have to to make decisions about suporting the rails etc. One thing that strikes me is that "A" gives...

Right Vaughan, I agree 100%, the little "sucker" will probably be presurized due to the centrifugal forces and the mass of the fluid (Whatever it is, I havn't read all of this.) On the inside it...

That geometry is definitely not optimal for a venturi. The function of a venturi is based on laminar flow (ask any pilot or hydraulic engineer) and you will never get that in this figure. The design...

Hmm... could it have been the Unimat 1 you have seen? It's a flexible "toy" that can be configured in various ways. Main colours is red and black.
Sorry have only seen pictures of them so I can't...

I didn't notice how small you was making it. - sorry. Small bearings means small balls that cant take much load.I t isn't easy to get rails stiff enough if you go down to that size. Have you...

Hi Greybeard!
Using nuts to get the bearings in angle is inded a little inovative. I like the simplicity. It must how ever be BIG nuts, but they can be found. You will how ever encounter some...

It exist many ways to pre-load the nut and I have used a few of them. One drawback is that it always add load to the nut/screw contact and it increases the load in the direction the nut is moving as...

I'm still banging my head against the cnc's. anyone out there knowing anything about Cortini?
/jan

It could be a lot of things. Semiconductors could be "Commercial grade" or "Industrial grade" or even "Military grade" and have totally different temperature range and expected lifetime. Testing...