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Welcome to a very addictive hobby. Joe's design is a good one abd will serve you well if you decide to build it.
Jason
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Hello everyone.
My name is Håvard, 23 years old and live in Norway.
I am very anxious to start building a CNC router machine, but I´m a student at the moment and don´t think I will have the money to start building one until the summer next year. However, I will make some very detailed drawing, and it would be cool if someone would like to follow up on me, and help me make this project as perfect as I want it to be.
My main inspiration source is at the moment the treads "Joe´s CNC 4x4 Hybrid" by Joe ( I guess everyone nows who Joe is....) and "Started but not finished" by hemsworthlad.
Cheers,
Håvard
Welcome to a very addictive hobby. Joe's design is a good one abd will serve you well if you decide to build it.
Jason
Hello again.
Today I have made a mock-up of the machine in inventor.
Hope you like it, and maybe can give me some hints of what I should change.
The dimensions of the frame is 3000 x 1500 mm, and I hope I will be able to
cut pieces up to 2600 x 1300 mm with this.
Cheers,
Håvard
I'd suggest a change to your x axis design. As is you have minimal support and not very large tubes to resist deflection. If you insert bracing of some type, you will have a much more rigid structure. See attached picture. You could also add more bracing to the machine base / x axis support to make it stiffer in the y direction. Otherwise it looks pretty good - similar to what I am working on.
Hi jsheerin
The frame is made by 40x40 mm tubes with thickness 4 mm, and the span between the legs is only 1,5m, so I don´t think there will be any vibrations. I will do some calculations on it, but of course it´s better to be safe then sorry.
Hi jsheerin
The frame is made by 40x40 mm tubes with thickness 4 mm, and the span between the legs is only 1,5m, so I don´t think there will be any vibrations. I will do some calculations on it, but of course it´s better to be safe then sorry.
Vibrations are not what I was talking about. As your gantry moves, it will make the rails bend due to its weight. If the deflection is small enough for your purposes, don't worry about it. But adding support will reduce deflection.
Hi again.
In this time as a student it isn't much time to anything else then studying for the exam, but I have made some changes to my design.
- I have made the frame lower, and made it more rigid.
- I have a hard time figuring out how to drive my x-axis. No my solution is
to use beltdrive as seen in pictures. What do you guys think about that?
Would be nice to have an input from someone with experience....
Cheers,
Håvard
I would take a look at cncrouterparts.com new rack and pinion system for the x axis. I just built a machine with their parts and was very pleased with the results. Take a look at his customer build pages: http://cncrouterparts.com
Hi marzetti and thanks for the reply.
I have seen it and been thinking about it, but I were hoping to not have to buy 2 steppers or servos for the x-axis. I have come up with one solution were I use rack and pinion with only one motor, but then I don't have the opportunity to use tension spring on the pinion.
So the question is, do I have to use tension spring on the pinion, or can I just mount it in a fixed position in proportion to the rack?
Håvard
and one more question....
Is beltdrive a bad idea? and why....?
Hi.
Because I am a student, I had some exams now, and I haven't been able to do so much thinking on my machine design. So I need some help....
I am pretty pleased with my x-axis and z-axis design, but I'm not that pleased with the y-axis. I would like to use belt drive on the y-axis as well, but I can't find a good solution for it. The reason for why I would like to use belt drive in stead of ballscrew is simply because it is cheaper and and I think it works as good as the ballscrew. The other option in stead of ballscrews is using rack and pinion, but then I have to change my design.
Would be great to get some answers on this, so that I can move on with my design.
Cheers,
Håvard
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