CNC model making.

[Design-HSB]

Through my thread My 1:22.5 scale coal mine I got the idea its own on the subject.
Here I will present how I work with a CNC machine in the model.
Also, I will try to answer questions raised here.

If we now think of CNC in the model, such a machine does all the work is not.
A CNC machine is a complement, and with it, some things faster.
Only one should have basic knowledge about the craft of model making have to be able to use a CNC machine.

Of course you can buy new CNC machines, there are these machines as my example but also used very good and cheap.
You can also purchase his CNC machine parts themselves assemble.


My CNC work with Windows computers and 2 monitors.
My CNC engraving machine was actually originally used for engraving plates.
Signs are now usually made with laser plotting.
These are fortunately very precise CNC engraving machines no longer in use and you can buy them cheap, as confirmed Ed us.
Disadvantage of these machines, they can only 2,5 D.
This means that only the X and Y axis are programmable.
The Z-axis can be set to a certain depth.

The depth of cut is really only for signs, and milled out of the signs meant.
Thus, it is limited to theoretical 4.5 mm.
Virtually everything of course and since then the milling length of the cutter is of crucial importance.


Here is the cover of the cutter with the built-in coverage is seen.
The cover is at the same height and does switch to the Z-axis reference only be set to 0.

By their own computer, the data sent by the software and only then, the CNC machine independent.

What is with all but the most important is a good software, because is not nothing.
It is important to find software that has the necessary drivers to operate the CNC machine.

At cutters I use special solid carbide cutters.

It is for the machine collets for different diameter:
Both metric and inch are possible.
I can deal with both metric is to say, though I prefer.

So if someone is offering you a machine with software and you can also show that this works well, it can be as a used solution is a bargain.

First of all, some materials science.
Well let's all milling material, which is hard and brittle.
The example of brass, brass is soft, it can turn the good, the milling does not change.
The hard brass which is exactly the opposite. Just as is true for aluminum and plastics.
For polystyrene form ore lumps to the router as you can remove material.
Hard plastics can be milled but excellent.
Also wood materials can be milled well, only here there is ever fibers, but which can be easily removed with a sharp brush.

Also, it is amazing how many tiny holes can be drilled with a CNC machine into hard material.
I'm always glad when the emotional drilling by hand, the drill does not end the same at the first hole.

Now I would like to continue with some pictures of what is possible with CNC.


Ideally, these parts could be milled from a hard brass.


All parts are milled here on the mast.


Even the diffuser lenses were machined from Vivak.


The used MDF wall part was pre-milled, the adjacent walls are already processed.

To be continued later than early June.

[lab-dad]

Helmut,
Thanks for sharing!
If I could do this I would never buy another kit again!
The locomotive parts are most impressive!
-Marty

[Chuck Doan]

Excellent!

[Design-HSB]

Part 2
I would now come to what obviously interested the most.
Particularly difficult is the milling of parts that must be processed by several sides.
Because that is the most difficult in milling the work piece during the processing are kept absolutely safe and resistant.

In the milling of sheet metal that goes simply by sticking to the carrier material made of wood.
I use a carrier-free adhesive film which you can easily remove it.
Only this process is actually only the first step.


0.2 mm spring hard stainless steel bonded.

The second problem is, therefore, the work piece for subsequent machining operations to accurately re-positioning.

So I'm already established in the construction of a possible workflow.

The processing of 2 sides is relatively easy to rotate the part with the material before the final milling around easily.
But as simple as that and not turn.
I must be absolutely positioned in the position to be the part exactly.
To this end I have left and bottom mounted stop rails.
The tracks themselves have not retouched on the measure 0 for the X and Y.
So I've only once a reference point I can get repeated.
The first part can now be milled already given a detailed outline.
Now this is to keep course again.
For this I milled me a bag in a slab of wood.
Wood has the advantage to mills the pocket with undersize, the work piece to hold.
In metal or plastic part has never adequately support.
If plastic or metal used in addition, I have to stretch.


Here is a square rod between the plastic is stretched.


Here, the milling cutter to run at the contour and easily through the plastic.


As a result, I get the fork to slide the push rod.


Here, the wooden board with the recordings for subsequent processing.


The finished slide rod.


The result of the finished slide rod combined with the sample already lever.


The lever was comparable.

RhB Xrot parts

As you can see the piston rods are finished already.
At the cross-heads are still the hardware installed but again, the body is already soldered into a doctrine.
The slide tracks are bored and for fixing the M1 cut thread.


As a small cake I is also the perfect tool kit for mounting the M1 and M1, 6 screws.
In the rod, the bearing is already inserted and the pin in the shifter rod is also missing, of course.


The parts for the wing are as ready, that they can be mounted.
The M1 bolt and the 2 mm waves are soldered.
The "Halsch" cranks are already functional and can be secured to the shaft by an M2 screw.

[Ray Dunakin]

CNC machining is beyond me, but this is still very interesting, and your work is superb!

[finescalerr]

I love it. -- Russ

[SandiaPaul]

This is excellent work! Thanks for showing it.

Just a note to clarify:
"pages" means "sides" if anyone is confused.

for example:

"The processing of 2 pages is relatively..."

The 2 words are the same in Swedish.

[Design-HSB]

Just a note to clarify:
"pages" means "sides" if anyone is confused.

Hi SandiaPaul,
Thanks for the hint I've corrected it. 
I still use correction software, but I had overlooked. 

If you do not understand something, please just ask and I try to explain this. 

[Design-HSB]

The aim is also to get along with as little change cutter, so I also milled holes.





Rod top view
1. Long-hole drilling and milling (red).
2. Cut out hole (green) Cut out stem contour (gray)
3. Cut out hole (green)
4. Cut out stem contour (purple)
5. Cut out stem contour (gray)

6. Rod side view

[lab-dad]

WOW!
I am speechless.................................
Amazing, thank you!
-Marty

[JohnP]

Google translate tells me that in German "I am flabbergasted." is "Ich bin entgeistert." Or "Ich bin erstaunt." for "I am amazed."

The very clever use of the old machine to make these small parts is wonderful. Making fixtures to hold parts for further machining demonstrates a vision through the entire build.

Thanks for sharing Helmut!

John

[eTraxx]

Found this .. haha

http://www.youtube.com/watch?v=6drMZqmyXQc

oh .. cool. It's on instructables.com

http://www.instructables.com/id/Easy-to-Build-Desk-Top-3-Axis-CNC-Milling-Machine/

3 Axis CNC mill for under $200

[marc_reusser]

Far beyond my current skills...but very tempted to learn more. Thank you for the great presentation and SBS. Wonderful work.


Marc

[chester]

Helmut, another master craftsman added to this forum. Beautiful work.

This, to show what else can be accomplished, sent me recently of a 1/87 scale late 60's Dodge Monaco done on a CNC machine from a solid resin block.

[Malachi Constant]

Hmm ... that late 60's Monaco is doing a really good impersonation of an early 70's Challenger!    -- Dallas