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Looking at your drawing the gantry seems too tall for the spacing of the bearings that ride on the X rails. You may also have issues with rigidity of the gantry in the Y direction.
Chris
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Hi!
Im a mechanical engineering student i Sweden, working on a school project of building a cnc-router. The goal is that it should be able to cut aluminum as the hardest material.
I have no idea of what the budget are and I am only in charge of the construction and motors.
I quote teacher:
"At this point I tend to say that I'm not interested in something special because I won t use it as a high volume production machine. So my philosophy is that the machine need enough power to cut "metals"...and at the same time I want to keep the cost down as much as possible...meaning small motors, linear guides ball screw etc"
I am supposed to use aluminum profile that exist in the school.
In my working design i have used 40x40 and 40x80mm profiles.
The ball-screws are not yet calculated, just sits there to see how it will be assembled. Im thinking about moving the table in the x direction and the spindle moves in the y and z axis.
All screws and stuff like that is not yet put in the cad model.
Dimension so far so you can see the size of it.
High: 500mm
Width of gantry: 780mm
Length: 1500mm
Z-axis back support plate: 300mm
Still looking at some different kind o linear guidelines due to those that are in the picture is kind of expensive, yet they are the most powerful as far as i know.
My concern is if the construction is stiff enough to be able to cut aluminum?
Have powerful bearing you need to hold for the cutting force? Would be nice to not over size them if not needed.
The work range should be at least 650x450x150mm.
Cuttingspeed (?) around 100m/min and optimal for aluminum cutting.
I got no experience in building a cnc-router.
I am interested in your thoughts and ideas as it appears you guys posses a lot of knowledge in this subject.
Anything I have missed and need to rethink?
Note: The design and redering pictures is made in Pro engineer.
Enjoy!
Looking at your drawing the gantry seems too tall for the spacing of the bearings that ride on the X rails. You may also have issues with rigidity of the gantry in the Y direction.
Chris
The distance to the table is not yet adjusted. Maby have to shorten the profiles on the sides.Originally Posted by OCNC
Any suggestion to improve the rigidity?
I think the profile used on the base is a little wimpy, the rails mounted to them would provide more rigidity. Either that or I'm just used to overkill.
I'd agree that you might want to stiffen the base up some. Possibly bolt it down to something heavy? As it sits, it looks like the gantry would cause the base rails to flex under load...
I 'advise' you to learn how to spell 'advice'. Sorry, couldnt resist!
Advise is the correct word, as in a verb. Advice is a noun, and in the context of the title the word "advice" would imply that it lies within the thread. But in this context, the OP is asking for advice; he wants us to "advise" him of what is needed. Or another way to look at it: You can make a one word sentence with a verb, but not a noun.
So I guess I'd have to "advise" you to take the context into consideration as well...
I would check out cncrouterparts.com.
I just put together a machine for a client using their parts and it was effortless. Searching for a lower cost linear rail drove me to their site originally.
The best part is he released all of the 3D models of the parts which makes designing your machine a breeze. A ballsey move but his prices are so good that even though I have the capacity to CNC machine the parts it just wasn't even close.
Not affiliated blah blah blah disclaimer your milage may vary or may be lost in translation etc....
Derek
Why is a milling machine made of steel as opposed to aluminium.Any suggestion to improve the rigidity?
As far as I know the frams are made of cast iron witch is a great material to withstand vibrations.Why is a milling machine made of steel as opposed to aluminium.
Correct me if Im wrong...
I see what you mean. Havent paid much attention to it so far. Kind of building up to down.I think the profile used on the base is a little wimpy, the rails mounted to them would provide more rigidity. Either that or I'm just used to overkill.
Made som changes to the bottom to increas the rigidity, my be some more change. Will be kind of hard to get the screw under it as its designed now.
Here is the latest model...
My concerns right now is if the gantry is rigde enough to the base porfile? what do you guys think? maby put some cross beams across on it, see picture below...
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