Discussion in 'Workshop Tips and Secrets / Tools' started by Mac790, Aug 18, 2009.
HI Berridos, i see you use Mach3 softeare, wich CAM use for generate gcode?
As I have been cutting the flying surfaces I have been using Profili. No problem...
However for wings and 4 axis you can do it in a couple of minutes in excel and exporting to a txt file withoout any cam.
On the horizontal tail surface I have problems with the hotwire kerf on one of the 4 sections. As it is tapered, one side has a bigger kerf because the wire moves more slowly and burns more foam. Profili has an adjustment for that.
It will become more interesting when I will need to cut my catia fuselage into 240 symetrical 2 inch slices. I expect to be sitting in front of the machine one month cutting all the pieces. However i am still not sure which cam I will use as I am redesignng the fuse. Still a couple of month left for that.
The precision of the wing ribs has been satisfying ( the transition between ribs cant be felt with my finger tips). Maybe I redo the tail surface as it is improvable.
Profili has also a sotwre for the fusealge but I am not sure if I will be able to replicate my design with that program.
I'm new member of this site and my future plan is building 4 axis cnc foam cut.would you please send me open source file for this project especially about firmware and PCB driver board.
I'm waiting for your help and my email is email@example.com.
thanks so much.
That 5 axis looks trick, if or when i can afford a shed dynabolting a low frame to floor is the way to go - rigid, easy to build.
Hello, I made a 3 axis cnc router, and I just Bought the electronic, with the program mach 3, but Ihave problems with the engine, because when i used without the program, the engine run very well, but when I put the software ch 3 the engine work badly, very slow and discountunied, what could it happen.
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Finally, after weighing between several configurations, I put myself in my hands and started to make some actual progress in the workshop.
Usable working area is 1430 x 50 x 10 cm (L x W x H)
One will probably look at the design and ask why this, why that..why not different...
Design I choose was influenced by some stock aluminum profiles I got for free, and linear rails and bearings I also gor for free from my friend. They are from a computer robotized data library... HP I suppose...
Rendered basic shape of the machine. Tiny details and parts are not included in this 3D drawing as they will be added..manufactured.. while assembling the machine.
Yep! Handsaw and some elbow grease!
One might ask "Why CNC at all..?"
Sure, the CNC is faster. Yet if serial production is not needed then doing it by hand might be as good as CNC, sometimes even better.
Great work Mitja.
Danger Zone, probably you didnt click on the "Read more..." at end of my post up there. I build my larger CNC router purposely. I already build one smaller years ago, but it is too small for a serious work. I design RC models and CNC router is the best way to cut plywood and balsa parts for prototypes and also for Short Kit production. In the near future I plan to design a bunch of Scale Vintage Gliders in various scale (from 1:4 to 1:2,5) and put Short Kits of them on sale. It is one of the options to gather some extra money for my future projects and to return money invested in this machine. As nowdays I work by CAD it is natural to continue using digital files further up to the CNC machine. Preparing CNC files (G-code) for the machine took some time, but you make them just once, no matter how many times you will use it in teh future. CNC machine allows you to cut fast and very acurate, no matter of the shape of the part. You can actually went "crazy" with shapes, that will drive you mad if you want to cut them by hand, but on the CNC it is a "piece of a cake".
Imagine, you must handmade all these sheets by this tool:
Or this electric driven saw:
So, the best, fast, economic option is CNC router, if one wish to build it by himself. Specially when design and produce such thing, a CNC router will speed up the whole proces of making a prototype and also if some production is planning:
I work on classic milling machines 40 years ago like this one
for about 3 years and I can appreciate CAD-CAM now.
I am very fortunate that my friend gave me a set of linear rails, bearings and stepper motors of dismountled Computer Library Robot, so this will lower the costc of my CNC router greatly.
Yeah, it makes sense, serial production is faster with a CNC machine.
How large will the wingspans be at the 1:4 and 1:2.5 scale levels..?
3,75m to 6m for standard class sailplanes.
Is there a market for such size of model sailplanes..?
Yes it is, but not large demand.
I am ahead of you somewhat. The router I have built is completely functional but we haven't cut a part yet. my gantry router size is approx 1.75 meters square with .3 meters depth of cut.
The way I fixed the depth problem of router hitting the work surface was to blend two tools together. First is the motor from a variable speed router for horsepower and torque. The second was a long nose grinder with a 1/4" collet and a cast small diameter nose. This allows cutting deep inside a fuselage half mold without touching any of the upper surfaces a foot deep. This also allows cutting down the side of a plug to the tangent a foot deep. The cast nose of the grinder gives a good bearing separation for a very true running spindle extension. Both were used or cheap and then modified.
My router is built of baltic birch plywood to the Rockcliff plans then altered. I am using Wantai motor/controllers and break out board tied to Mach3.
Some progress. I am easily distracted from work, by just "playing" with machine parts....:
"Ooo! Ooo! Mechanical squirrel!!!
This morning I made first test cut on my almost finished machine. It was 2,5mm diameter mill bit ("spiralverzahnt") and 3 mm thick white poplar plywood, usually used for RC models thesedays:
Responded to wrong post...
That's awesome! You must be so proud and excited.
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