CAD for simple 3-D metal & wood projects?

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On 11/24/2013 12:45 AM, Gunner Asch wrote:

Half a TENTH. I woke up in the middle of the night and realized I wrote that wrong.
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wrote:

(Grin)
__ "A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Heinlein
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On Sun, 24 Nov 2013 17:10:43 -0500, "Mike Marlow"

Blink blink? Say what?
Half a tenth is 50 millionths.
__ "A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Heinlein
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On Sun, 24 Nov 2013 21:48:06 -0500, "Mike Marlow"

No. You seem to be missing a number of zeros...
Gunner
__ "A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Heinlein
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On Sun, 24 Nov 2013 23:57:11 -0500, "Mike Marlow"

Actually..a lot of guys become machinists after retirement from their office job. Some really good work turned out by old guys. Steam engines are one of the favorites.
Gunner
__ "A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Heinlein
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What is the tolerance for hydraulic spool valves?
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I did too. The last post claims .000025" to .000040" clearance for aircraft valves. http://www.practicalmachinist.com/vb/general/hydraulic-valve-spool-clearance-232520/
jsw
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On Sun, 24 Nov 2013 09:05:11 -0500, "Jim Wilkins"

Gunner
__ "A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Heinlein
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A few tenths, usually. And then, only that close when they pay really close attention to the coefficients of expansion of the spool and the frame.
Remember that there has to be enough room between parts to develop a film of lubricating (and sealing) oil, or they don't work.
There's an old (perhaps true) mythos about when Royce/Rolls first introduced an automatic transmission. They were adamant about making it to much tighter tolerances than "consumer" trannies, because they demanded the utmost in 'quality'. Then they discovered that the valve body and shuttles HAD to be sloppy in order to work at all. <G>
Lloyd
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On 11/24/2013 8:15 AM, Lloyd E. Sponenburgh wrote:

John Browning's 1911 .45ACP:
With too tight tolerances, the pistol is unreliable in combat conditions due to mud, dirt, dust and the debris of a combat environment, and the guaranteed likelihood of not being able to keep it clean and lubricated on a regular basis.
That built in sloppiness sacrificed accuracy for reliability, but made for an excellent tradeoff for a weapon used mostly in close quarters.
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rec.crafts.metalworking the following:

    Same goes for the AK-47. -- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone."
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On 11/24/2013 8:15 AM, Lloyd E. Sponenburgh wrote:

Many years ago my shop foreman, that at one time lived in England and worked for Rolls, claimed that the engines used no head gaskets, the heads were bolted straight onto the blocks.
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My Deutz tractor is the same way. Precise construction. The heads are made with a shallow taper joint, and they bolt directly onto the cylinders (air-cooled, so the cylinders bolt TO the block, rather than being a part of it).
Lloyd
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"Lloyd E. Sponenburgh" <lloydspinsidemindspring.com> on Sun, 24 Nov 2013 08:15:37 -0600 typed in rec.crafts.metalworking the following:

    Probably developed a very precise definition of what constituted "sloppy". B-) -- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone."
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On Sun, 24 Nov 2013 08:37:21 -0500, "Mike Marlow"

.0005?
5 tenths in other words. And those are common as dirt.
__ "A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Heinlein
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Yes, but that's how we got where we are. After all, somebody had to start with rocks and sticks. I'd still like to see a readable account of how it's done. Moore's "Foundations of Mechanical Accuracy" gives a good start, but the narrative is hard to follow beyond the basics.
bob prohaska

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On 11/24/2013 8:21 PM, User Bp wrote:

Now THAT'S an old computer - rock for zero, stick fro one...
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Richard wrote:

You just had to stick that in here, didn't you? ;-)
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01:12:21 -0500 typed in rec.crafts.metalworking the following:

    He's lucky he had sticks. All we had were the rocks and sand. Rock/no rock. that's all we had. <http://xkcd.com/505/ -- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone."
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On 11/25/2013 3:46 PM, pyotr filipivich wrote:

But we LIKED it!
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