Printer stand modeling

This was my first attempt to use Blender as real modeling tool. I built the printer stand on August, 2014.

printer_table_model

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I used default Blender unit as dimension of all objects. One unit is equal to 1 mm.
I created all objects from the plane object by applying extrusion manipulation of vertices.
And I made three clones of the leg object, three clones of the bracket object.
I didn’t made fastener objects – bolts, nuts, and washers.

Specification:
1x Plate: 230 x 350 x 13 (Width x Length x Height)
4x Leg: 20 x 35 x 400
4x Bracket: 15 x 35 x 35

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The blender file

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Occasional visitor – a city pigeon

It was raining in the morning.

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2014:09:24 09:06:58, f/4.0, 0.0080(1/125), ISO 400

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2014:09:24 09:07:40, f/4.0, 0.0080(1/125), ISO 400

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Journal of 2014/09/28

Full size pounder made out of concrete for earthbag

Removed the sheet metal mold.
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There is little crack on top.
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The bottom looks flat.
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Smoothed square edges of the handle bar using a grinder, flat and square files.
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Medium length of bubble level, 83 cm.

I applied left-over fiber glass on it when I worked on the helmet few weeks ago.

Smoothed the surface of the level
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Applied one layer of primer paint and let it dry over two hours.
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Checking flatness of the wooden level
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How to make mirror effect on object in Blender?

The bearing modeling at millimeter unit is done. But I missed some options that make mirror effects on objects in Blender.
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I’m going to work through the blender file that creates the following image.
mirror_effect_rendering

09/27/2014

mirror_effect_sample1

Simple cube object seems to be applied by Shading: Smooth on the Tool shelf.
The Mirror option in Material property manages reflection ratio of object.

Material property set for the golden cube

Type: Surface

[Diffuse]
Type: Oren-Nayar
Intensity: 0.800
Roughness: 0.900

[Specular]
Type: Phong
Intensity: 1.000

[Mirror]
Reflectivity: 0.400
Depth: 3
Max Dist: 0m
Gloss:
Amount: 1.000
Fade To: Sky

[Options]
Traceable
Use Mist

[Shadow]

Receive
Cast Buffer Shadows
Auto Ray Bias
Cast Approximate

World properties

[World]
Blend Sky

[Ambient Occulusion]
On
Factor: 1.00

[Environment Lightning]
Energy: 1.000
White

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Thousand Plants against Cancer without Chemo-Therapy

Giuseppe Nacci, M.D.

Thousand Plants
against Cancer
without Chemo-Therapy

OCTOBER 2008
500 pages

EVIDENCE BASED MEDICINE:
1,700 official scientific publications
1,750 various bibliographical references

From:
“Mille Piante per guarire dal Cancro senza
Chemio” book –on line
(http://www.erbeofficinali.org/dati/nacci/index.php

http://www.alternativemed.eu/cancro/1000%20piante_cancro.pdf

http://aloearborescens.tripod.com

http://www.mednat.org/Nacci%20libro.pdf

http://www.medicinetradizionali.it/nacci.htm

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Two features that help precision modeling in Blender 2.6x

How precision and unit work?

Most buildings and houses are few centimeters off from design specification that is acceptable error. Furniture and door / window frame are few milliliters off. How many experts in trade know how to construct the right angle without using square or straight edge? Forming the right angle that produces vertical and horizontal reference point is the base of serious precision work. My improvised work bench made out of an old fuel tank hasn’t been secured on the floor yet.

The smallest unit of most wood workings is millimeter. Anything that goes below one millimeter demands precision cutting and finish works that require decent equipment and tools. I can cut a piece or drill a hole within 0.5 mm accuracy using hand tools. I’ve done such job few times. Honestly those experiences forced me to have better tools that have great accuracy. Well-known technique is to handle this is extra size of cutting dimension or holes. One micron is equal to 0.001 millimeter.

Excerpt from Precision Modeling by Robert Burke (www.rab3d.com)

So how big should I make a blender unit?
If you were considering modelling a precision component or assembly, being
able to model down to sub micron accuracy would be a distinct advantage. So
if we consider one blender unit to equal one millimetre how accurate can we
get? Blender allows you to numerically input the distance of vertices to the
precision of 4 decimal places (0.0000). Say you extrude a vertex 0.0001mm
along the X-axis you have set its position 1/10th of a micron from the original.
Pretty darn accurate and given that the best CNC machining centres can
position to an accuracy of plus or minus 3 microns, you can model to a much
greater accuracy than you could ever manufacture to. The draw back to this is
your viewable workspace will be limited to a cube with 10 metre sides. This is
due to the clipping limit of the view camera, but unless you are designing a
gantry mill to cut the wing spars for an Air-Bus A380 this shouldn’t present a
problem.

Putting Size into Perspective
♦ The human hair is around 76 microns thick.
♦ Most general purpose machine tools in
skilled hands would be able to work within
two thousands of an inch (50 microns)
♦ The best CNC machining centres can
position to an accuracy of plus or minus 3
micron, with repeatability of plus or minus 1
micron.
♦ A 100mm-iron bar will expand 0.012mm with
a rise in temperature of 10 degrees C

Precision modeling is to design an object for building a simple part or complex machine in real life. Dedicated software for this job called CAD already exists. Since I decided to build Kossel Mini, one of Reprap’s 3D Printer models, I felt I would need to learn precision modeling.

Blender supports millimeter unit. To set millimeter as default unit, change the Scale value to 0.001 in Property View Port, Scene, Unit, Metric menu.

Properties panel also has a measurement menu that displays length, angle, and area of selected edges or faces. I made few basic objects to test the measurement menu. On the image there are one isosceles right triangle, a square, and polygonal circle. Anyone who has basic geometry knowledge can verify the numbers Blender calculated.

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Toolshelf has Ruler/Protractor button that measures length and angle of temporary lines on the 3D View port in Edit mode. User guide of Ruler/Protractor is here. The instruction is straightforward. You need to practice until you get the hang of it.

edge_info_3

I worked through till Part 4 of the Modelling a 608 Bearing tutorial by Robert Burke. I think this one is by far the best tutorial about precision modeling in Blender. As you see the below image, Blender handles one thousands of millimeter, which is enough precision of engineering applications.

edge_info_2

I spent good hours to finish Bevel edge section due to the inaccurate Knife operation. It created one slightly off vertex which supposedly wouldn’t exist along the edge.

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Busted edges after Bevel operation
precision_modelling_20_bevel_bug1

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Journal of 2014/09/22

I made a full pounder that is explained on Earthbag Building, Kaki Hunter and Donal Kiffmeyer. The full pounder weighs about 5.5 kg (12 pounds), shape is like plastic planter pot, 15 cm diameter, 17.5 cm height. I reduced diameter of the cylinder shape pounder to 13 cm.

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I went to bed last night around 8:00 P.M and woke up two hours later. Then I had worked till six in the morning before I had a nap after breakfast. And I got up 7:30 A.M to finish the work light. I destroyed one switch due to the wrong wiring at first time. When I plugged it to the outlet, the light turned on even the switch was off. Then as soon as I turned on the switch, it triggered the circuit breaker of the main power. I probably spent half hour to found out what was the problem.

I was going to build a stand for the work lights but I decided to mount it on the tripod whenever I use it, and it turned out great.
It has two rotational axis: horizontal, vertical. It turns 360 degress in horizontal, vertical movement has thirty to forty degrees up and down.

The light bulb sockets are connected in parallel.
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Indoor testing

West side
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East side and upward
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East and downward
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Outdoor testing

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