My design

Complete Assembly
The main assembly is made from four major assemblies:
  1. The Table
  2. X Axis
  3. Y Axis
  4. Z Axis
The complete machine was calculated at 167kg but I am sure that in reality this will be even higher (a lot of small parts were not included in the 3D drawing) so I expect to be around 200 in the end.
Main dimensions: 
  • length = 1520mm
  • width = 1553mm
  • min. height = 1493mm
  • max. height = 1783mm

3D and 2D drawings can be found here...
Please let me know your opinions about it.

1. Table
This is the fixed part (not moving). Also on this your part will be fixed so it doesn't move during machining.

In order to get good precision with a Tooling machine all parts needs to be as rigid as possible.
So I tried to make the table not to bend under the load. That's why I designed it with eight sliding linear blocks.

I know the top plate is not as a normal machine tooling but I had two reasons. If I was going to use aluminum profiles this will mean extra money and extra weight. I know what you are thinking: how much can add extra? well... to fill in the table completely i needed 25 linear meters for every square meter. And one linear meter has around 1.7-1.8 kg so it's a lot.
I also thought to put a five mm carbon steal plate with some holes which is quite cheap... but "on paper" the whole plate will be around 80kg so it's not a solution yet.
So for this reasons I decided to use a special marine plywood with nuts on the other side for fixing the part which is machined. (this is not showed in my drawing yet but I will put some picture with the plate when it will be build)

The theoretical weight of this table is 83kg.
Main dimensions:
  • length = 1520mm
  • width = 1320mm
  • height = 294mm
I need to make some kind of coolant drain system on the top plate (some groves on the sides) which will be collected in a tank underneath the table. The coolant will be used for metal machining most usual. For other type of materials (like wood or plastic) I am thinking to make a vacuum system around the spindle (all this were not included in the 3D drawings; I will some back with some pictures during construction)

X Axis
 In my first design I used only one guide bar with just two linear bearings on each side. But in this way the table has support only on the side and I was afraid that the whole machine will bend (especially the table when the tool will enter in the part). So I got this idea (don't know if it's good or bad... yet) in which I used two guide bars and four bearings on each side. And I know very well that this will costs a lot extra but I think it's worth it.
I also used some carbon steal plates to make the aluminum profiles more solid.
About the double 40x40 aluminum profiles... I have no good explanation why I didn't use 40x80 instead. Maybe it sounds crazy but I kind of wanted to use only the same type of profiles... Also when I looked at the 40x80 profile to me it seamed to have less aluminum than two times 40x40.

Theoretical weight of the X axis is 61kg.
Main dimensions:
  • length = 1553mm
  • width = 225mm
  • height = 1242mm

Y Axis
The Y axis looks like this because of the Z axis. I wanted Z to have at least 400mm length but most of the parts I will actually cut will be plates max 50mm so for this purpose the Y axis assembly has ten linear bearings on it. Again... I believe that the extra cost is worth it (you don't build a CNC every second week)
The fans are for the spindle. It may sound crazy but I'm building my CNC in my apartment, so because I don't want to disturb my neighbors i went for the liquid spindle. I need also to build a support for the tank. But I will figure this out later (hope I have space for it in here).

Theoretical weight of the Y axis is 15kg.
Main dimensions:
  • length = 792mm
  • width = 225mm
  • height = 365mm
Z Axis
 The Z Axis is more or less a carbon steel 5mm plate with who guide bars on which I installed the spindle. I hope it will not bend. I f this will happen then I will weld some other plates for reinforcement on it.
I have some other ideas with it (install a camera and other stuff) but for now this will have to do.

Theoretical weight of the Z axis is 10kg.
Main dimensions:
  • length = 1050mm (counting spindle)
  • width = 214mm
  • height = 159mm

No comments:

Post a Comment