CAD for simple 3-D metal & wood projects?

[krw]

You still make no sense. Are you saying that precision machining doesn't require the same level of modeling that sloppier work does? Really?

[User Bp]

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

[Lloyd E. Sponenburgh]

"Jim Wilkins" fired this volley in news:l6u4qk$qdf$2 @dont-email.me:

Jim, these guys who are harping on the issue have been working to maximum tolerance of 1/32" for so long that they cannot imagine anyone working to tenths of a thousandth of an inch.

And because THEY can't do it, they state flatly that "nobody" in this group can.

Lloyd

[Richard]

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

[Gunner Asch]

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

[Gunner Asch]

Unless you know more than the basics. Shrug.

This one will hold half tenths all day

So will this one

And neither are expensive machines. Shrug

This one..is an expensive machine..and its a mill..not a grinder

Notice the raw metal removal is done dry. Thermal shock would explode the ceramic cutter if done wet.

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

[pyotr filipivich]

Gunner Asch on Sat, 23 Nov 2013 20:00:04 -0800 typed in rec.crafts.metalworking the following:

I'll take your word for it. My experience differs. So what? I must have been in the wrong plants. Boeing only insisted on 30 thou. And Jorgensen only insisted that the part be consistently within 4 tenths of what ever final dimension in the "regular" tolerance you reached - over a ten to fifteen foot part. On a manual lathe. (But I never got to work on any of those jobs.)

OTOH, I have worked places where we measured each part, trying to keep up with the thermal expansion as the day warmed up.

Just lean on the machine, that will flex it enough. B-)

-- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone."

[Michael A. Terrell]

[Michael A. Terrell]

You just had to stick that in here, didn't you? ;-)

[pyotr filipivich]

"Lloyd E. Sponenburgh" 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."

[Gunner Asch]

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

[Gunner Asch]

Which is why most good inspection departments are kept at 68' and is so noted on the print. Had one of my clients crank out some 1500 parts EXACTLY to spec...in August. and their air conditioning was down for a week or so.

When they went to the clients QA...they were considerably smaller than expected. Fortunately..it was a RCH this side of being in tolerance..if you held your head just right...but it was the first time in 15 yrs that either side got into a pissing contest with each other. And it wasnt Boeing ..but MD.

You were just cutting parts for Boing! that required .03 tolerances. Some of their other stuff...very small tenths

Speaking of RCH...do our woodworking compadres know about RCH and the other colors of tolerance?

(VBG)

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

[none]

On Sun, 24 Nov 2013 10:45:29 -0600, Leon

Well, I've got to tell you, I'm impressed. It looks good and it adds functionality. Definitely something I'll consider adding to the next shelving project I do.

Thanks

[dadiOH]

Well, I for one do. But my experiences with them had nothing to do with woodworking and were long ago :)

[Markem]

Yes Lloyd keeping on painting with that brush. You get into many "discussions" that carry on and on?

[Jim Wilkins]

Try this:

jsw

[Lloyd E. Sponenburgh]

Markem fired this volley in news: [e-mail]:

You bitch about the color I'm using, but you don't even pay attention to what it IS.

I said, "The guys who are harping on (it)"... Not ALL woodworkers, and not everyone else; just the guys who are denying.

If you paid closer attention, you might actually not hate the 'decor'.

I'm kind of strident about 'good work' because I design machines to manufacture explosives. You don't get many 'second tries' in that endeavor.

Lloyd

[Jim Wilkins]

Social Equality requires that no one should be allowed to challenge their fragile self-esteem by displaying more knowledge or possessions.

The fundamental difference between right and left is that seeing innate differences prompts the right to improve themselves, the left to tear the others down and demand political cures for their psychiatric deficiencies.

jsw

[Leon]

Thank you, this is a method/style I came up with about 3 years ago. I'm sure I am not the first but I don't recall seeing it anywhere else. I have built 20 separate cabinets units using back face frames. AAMOF in the group of pictures that the link points to there are back face frames on Mary's cabinets, the two tone pantry, the 3 upper and lower book cases, the desk unit with the upper unit with the curved top rails on the doors, the TV cabinet with 6 drawers, the spool lower cabinet and lastly the two cabinets under the long arm sewing machine.

With you having the domino the lap joints reinforced with the domino floating tenon used on the back face frames should be easily doable. Again if you would like a drawing showing the details all you have to do is ask.

[Markem]

Most have not denied it just asking question to understand the jargon that does not jibe with they're own experience. Your reading of text only gives you 7% of communication at best, might want to keep that in mind.

I have been paying attention nor have I bitched, just posted an observation.

Mark