Yep. In "the old days" there would be a set of blueprints drawn
up, and there were two models, one with the garage on the left, the
other with it on the right, with the same cabinets, doors windows
etc..
Now, with CAD software, you can have a basic house plan, which can
be flipped left or right, and you can have any cabinet, window or door
treatments - as long as it is in the menu of options.
And the CAD packages make it "simple" to have a "custom" set of
prints with all the options incorporated in the print, rather than as
an add-on.
I recognize that I was griping about "cookie cutter" houses, all
looking alike, and realized that this is not new. Nowadays, the
builders/architects use the same design software, before that it was
the "Book of House Plans" before that everybody had the same materials
and there was but one way to make a house.
--
pyotr filipivich
"With Age comes Wisdom. Although more often, Age travels alone."
Oh I have no doubts about that. "You can have any kind of
countertop you want - as long as it is Granite."
--
pyotr filipivich
"With Age comes Wisdom. Although more often, Age travels alone."
'National Homes' built entire subdivisions after W.W.II with a single
floor plan. Hundreds or thousands of them per project. The would lay
forms for the foundation, and one week later it was ready to move into.
All lumber arrived precut, as well as all the plumbing and wiring. They
worked down each block, doing the same job over and over until all the
lots had homes. My dad bought one when I was in elementary school, and
sold it when I was in Jr. High. We added a bedroom to it, and it was
the only one different for blocks.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
19:04:59 -0500 typed in rec.crafts.metalworking the following:
"I'm upside down, my head is turning around
Because I gotta sell the house in Levittown "
Say what we will about the "'burbs", it was the first time for a
lot of families that they got to own the house. Even if it was with a
long mortgage.
Here's To The Crabgrass
Here's to the crabgrass,
Here's to the mortgage,
In fact, here's to Suburbia.
Lay down your briefcase,
Far from the rat race,
Where nothing can disturb ya.
Uncomplicated,
It's what we waited
For so long in this city.
Come let us go there,
Live like Thoreau there,
A life of sweet simplicity.
Did you set the thermostat?
No, I don't know where it's at.
Tuesday the Cub Scouts meet again.
Walk the dog and cut the grass,
Take the kids to dancing class,
Jim's Little League got beat again.
Can't keep a maid here,
No matter what they're paid here,
The place has bad publicity.
Why did we move here?
Don't you remember?
To live in sweet simplicity.
Here's to mosquitos,
Clam dip and Fritos,
To golf and bridge and scuba there.
Men wearing knee pants,
Women in Capri pants,
Discussing what's with Cuba there.
Each big appliance
Treats you with defiance,
Until it finally falls apart.
Call the repairman,
In a week he's there, man,
To knock your kitchen walls apart.
Tommy's got a bloody nose,
Gotta fix the garden hose.
Book Of The Month Club came today.
Didn't read the last one yet.
Yes you did, but you forget.
Oh well, they're all the same today.
Here's Mrs. Ritter,
She's the baby sitter.
Tonight we're going joyously
Back to the city,
Where life is gay and witty,
Back to the noise there,
That everyone enjoys there.
Back to the crush there,
Hurry let us rush there,
Back to the rat race,
Don't forget your briefcase,
Back in the groove there,
Say why don't we move there.
Away from all of this
Sweet simplicity
--
pyotr filipivich
"With Age comes Wisdom. Although more often, Age travels alone."
On Thu, 19 Dec 2013 01:02:05 -0800, pyotr filipivich
You didn't give Allan Sherman his due!
http://www.youtube.com/watch?v ýPr3jq7pf4 for the whole "My Son, the
Nut" album. Because I'm not going to dig all the stuff out to rip the
one song.
On Fri, 20 Dec 2013 10:11:43 -0800, pyotr filipivich
Nevehoiduvim. I cringe remembering "Hello Muddah", but I was a real
fan of Monty Python and Firesign Theater. I have several Firesign
albums and still play them on occasion. The early ones, All Hail and
We're All Bozos on this Bus.
Entering freeway, which is already in progress.
Apple Valley Condoms. If you lived here, you'd be home by now.
--
I merely took the energy it takes to pout and wrote some blues.
--Duke Ellington
21:45:50 -0800 typed in rec.crafts.metalworking the following:
IHOSHO, you've missed a lot. One of my favorites remains the
"Ballad of Oh-Boy", which is a series of questions to which the
response is "Oh boy":
Winters at Miami Beach
Oh Boy
Scratching where you cannot reach
Oh Boy.
Somebody scratching your itch.
Oh boy.
Andywway ... tastes is tastes.
"...through the fog
doggedly!" (bark bark)
ruthlessly" ('Whatever happened to Ruth?')
"across the street and into a building!" ("Ow! my nose.")
yeah ...
--
pyotr filipivich
"With Age comes Wisdom. Although more often, Age travels alone."
On Wed, 18 Dec 2013 09:48:36 -0800, pyotr filipivich
Alright, boys, let's all sing it (in horrible disharmony, as usual):
https://se965.infusionsoft.com/app/linkClick/1031/399eb6c949dfe356/783007/fccafb24c80e7df5
Little boxes on the hillside,
Little boxes made of ticky tacky,1
Little boxes on the hillside,
Little boxes all the same.
There's a green one and a pink one
And a blue one and a yellow one,
And they're all made out of ticky tacky
And they all look just the same.
And the people in the houses
All went to the university,
Where they were put in boxes
And they came out all the same,
And there's doctors and lawyers,
And business executives,
And they're all made out of ticky tacky
And they all look just the same.
And they all play on the golf course
And drink their martinis dry,
And they all have pretty children
And the children go to school,
And the children go to summer camp
And then to the university,
Where they are put in boxes
And they come out all the same.
And the boys go into business
And marry and raise a family
In boxes made of ticky tacky
And they all look just the same.
There's a green one and a pink one
And a blue one and a yellow one,
And they're all made out of ticky tacky
and they all look just the same.
--
I merely took the energy it takes to pout and wrote some blues.
--Duke Ellington
"Lloyd E. Sponenburgh" <lloydspinsidemindspring.com> wrote in message
I do a fair amount of 3D with CamBam, but to be fair anything I can do with
2D (2.5D) I do. For me its about the price. I tried a lot of different
free and low price CAM software, and CamBam was the only one I could afford
that does do 3D ok.
It's a one man show so forget arguments based on the documentation. The
documentation is way behind what it can currently do. I would rather Andy
work on bug fixes and new features than spend all his time writing doc
files. That being said, my opinion was reversed when I started learning how
to use it a few versions ago. I was frustrated by the lack of detailed
documentation in some respects.
Somebody was talking about surface accuracy of a tenth. As near as I can
tell the limitation here is the processing power. CamBam does 3D machining
of a surface in two different manners, and that's pretty much it.
1: Waterline - It does waterline at a depth increment either as a finish
(0-X roughing clearance) where it cuts the contour lines of the part only,
or it does waterline roughing with (0-X roughing clearance) where it removes
all material in the defined area to finishing that depth increment at the
contour line. For some reason the waterline method seems to leave material
I would not expect sometimes.
2: Vertical or Horizontal (scan line method) This traces the surface
either with horizontal or vertical passes, and it can be by depth increment
or no depth increment. No depth increment is nice for a finishing pass as
it will trace the surface exactly (within the set resolution) on each pass.
Using this method with boundary shapes, defined cut areas, or a cut limit
based on the surface itself is modestly powerful.
There are some tricks also... For instance you can rotate the surface (and
other associated geometry if needed), and then rotate the MOP back to the
original position to get diagonal scan lines. The transformation matrix is
pretty powerful in that respect, but there are things it gets confused at.
Fortunately they are things that confuse me to so we agree not to do those.
LOL.
What affects surface accuracy is of course the resolution of the surface
mesh (STL or 3DS) and the defined resolution of the machining operation. In
a 3D machining operation it calculates the depth of Z based on a percentage
of cutter diameter along the scan line. For example with a .0625 diameter
cutter and a machine operation resolution of .01 it will recalculate the
depth of Z every .000625 inches. With a large operation that can be quite
time consuming to calculate tool paths. The higher the resolution the
longer it takes to calculate the tool paths, but the cut time is based on
the run mode of the machine, and the acceleration rate. Sometimes I
generate tool paths that take 45 minutes to an hour just to calculate them
on my little dual core processor CAD/CAM computer. As of the last time I
checked CamBam can actively use 2 worker threads for a MOP, but that's it.
(I seem to think it might only use one worker thread per MOP.) More
processors helps to calculate multiple MOPs at a time, but doesn't help
speed up a single MOP. It can also be memory intensive. I occasionally get
out of memory exception errors, but I am running it on a 32 bit OS that
doesn't even address all the memory I can socket on the motherboard. I do
wish that Andy had set it up to swap out to the hard drive (or maybe an
external memory drive) like we used to do back when memory was expensive and
the local computer gurus carried RAM in their fanny pack with their sidearm.
LOL.
So in theory atleast you could possibly get scan line resolution
calculations to within a tenth for a very simple small operation, but with
comparable step over it might take days to generate the tool paths. More
processing power, 64 bit OS, and more memory could probably help some, but
there really are practical limitations. I've generated code before that has
taken hours. For most of what I do with 3D I am happy to be within a .0015
for depth. As somebody else mentioned the fish don't really care. My
machines aren't accurate enough to get any better than that anyway. Well,
my Hurco mill is fair, but I run in CV mode with a 90 degree mode switch
limit and a .003 rounding limit most of the time.
The one thing that CamBam does that also looks like 3D is engrave a
polyline. With an engrave MOP the cutter will follow with the tool centered
on the line at the whatever depth RELATIVE TO THE LINE you set in the MOP.
This is handy for things like engraving a name on a surface. If the
polyline is not defined with bulges or arcs it will follow the line using 3
axis anywhere in 3D space that the line goes. It does not have to be on a
surface. I used this method to trick it into doing some 3D work before I
got a 3D CAD program and learned to use 3D MOPs in CamBam. CamBam also has
a nice tool to project lines to a surface. I use that with an engrave MOP
as a "trick" to engrave certain types of details into molds sometimes, and
its child's play that way to engrave a clients name into a mold that way.
CamBam is the best "affordable" hobby CAM program I have tried and in many
respects easier to use than some more expensive programs I've had the
opportunity to try.
It does not do "remaining material removal" machining. It would be nice,
but I have to figure that out for myself. If it did I would have saved
myself a dollar or two on broken cutters when I switch to a smaller cutter
for detail work. "Remaining material removal" machining is a fairly complex
bit of code to write. Constant engagement tool paths, trachoidal tool
paths, etc... HSM tool paths. Those would all be nice, but they aren't in
there. To some degree you can do it manually with good planning, but its
not powerful enough to do it all for you and take the thinking out of the
button jockey.
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I have heard some good things about MadCam.
The 3 axis module sells for under $1000, but you need
to own Rhino also.
http://www.madcamcnc.com/start_page.html
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That is not all that affects accuracy. Even if you have the time
and computational power and storage capacity to produce g-code
files with millions of data points there is still the question of
whether your CNN can fluidly move to all those data points and cut
the part to within .0001".
If you had a machine that could do that
it is unlikely you would be using CamBam.
If you are making fishing lures and the end product
conforms to the original CAD surface geometry to less than
0.002" then you are doing exceptionally good job.
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The issue with producing toolpaths from meshes is not entirely
about accuracy. 3d surface cutting usually requires a ton of point
to point tool moves to cut the part. Ideally, at the micro level each
pass of the tool across the surface should be parallel to the last
pass such that the tool is constantly removing about the same amount
of material. To do this with point to point moves, each point to point
move in one pass should line up with the point to point moves of the
previous and next pass. Creating tool moves from well constructed meshes
is a way of making sure the point to point moves in each pass match
up to the moves in neighboring passes.
In most cases when the CAM software people tell you that they
create toolpaths from surface data what they mean is that an
ideal mesh is created that is aligned with the projected motion
of the tool across the surface. If you set the toolpath tolerance
parameters loose enough you will still be able to see in the
surface finish the underlying mesh pattern.
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