kadirilkimen

Depends on what you cut. It cuts wood pretty nice. I couldn't documented the wood cutting performance on prototyping. I will demonstrate it's wood cutting capacity in v1 release. It's a 3d printable desktop machine and never intended to cut precise metal parts. May be I can design a full metal body version with professional components like rail guides instead of plastic v-slot wheels.

It is 0.025mm on the outer edge of the table.

How did I get a background in toolpath generation. I don't like talking about myself in public. You have my website. If you really want to know more about these, please contact me. I happily answer your questions.

About recommendation; Toolpath generation is based on 2d and 3d geometry math. Simply dive into 2D and 3D geometry and try to understand some libraries. This is a very good one: http://www.angusj.com/delphi/clipper.php

Most 2d and 3d calculations are based on triangle calculations. There are also solved algorithms like finding the closest point on a curve. Once you start playing with triangles, I'm sure with some software development and machining background you can easily begin to understand how toolpath generation works. It's easier to create toolpaths from stl files. Because stl models only consist of triangles. Thanks to the gaming industry, triangle-based math isn't a cutting-edge science these days, and there are many open source libraries.

You also need tons of coffee and tons of dedicated time.

Thanks. It was on my scope.

What a nice project. How I missed that :)

Hi, I don't see it as a challenge. Current machine have 0.025mm resolution at the outer edge of the table(260mm diameter). I think it is possible to build a 400mm diameter table with stepper motor. Any bigger table would require a slow operation or a high speed servo motor to get enough precision and speed. It is still not impossible. With a good servo motor you can have 2000mm diameter and good enough rpm.

Hi, I am the developer of the Machine. It is a bad machining. But not because the machine. I don't have a good 4 axis paid cam software. So, I developed a software myself to generate 4 axis milling. Obviously it has a bug and it wasn't possible to generate a finish work.

After I release mechanical design v1, I will work on the codes and hopefully will be able to demonstrate a clean finish work.

Hi, I made some carving on wood while developing the prototype. But didn't documented it. It is possible to cut wood. But not metal of course. You can get good results with the wood.

I machined plaster and wood on this machine. Both works well. I had only one 775 motor without speed controller while developing the machine. So, if you have a configurable rpm spindle with low vibration, you can get very good results on wood.

It's a 3d printable cnc machine. Of course it is not rock solid rigid and can't machine hard parts precisely.

It is pointless to compare this machine with a high end high precision machine. You can't get that rigidity and precision from a 3d printed part.

But, may be someone wants to build it from metal. Then you may consider to get better results.But this requires more modification because you can't expect high precision while using v-slot wheels.

Hi, Thanks! I am the only one who works on the project. I didn't like my sound on the record and decided to use robot voice.

That's right. I would embed the video on the front page. I will do it as soon as possible.

This is totally doable and there is no harm to do it.

It would be another project and I hope someone develop something like that.

All these things can change widely by choises. We can't claim that this is better or that is better. All have their own pros and cons.

I designed the PolarBear this way because I was hoping that machining 4axis like would inspire a lot of people to do different things on cnc machines.

Hi, of course I am not saying that I will develop a complete software package. I am a single guy who loves to work on these stuff. The repository is empty, Because I have no work on it yet. I developed several 2d and 3d toolpath generators for specific purposes for private companies. Always suffered from cam softwares and since I have enough background on the toolpath generating, I decided to work on it. We'll see in time. Most of strong open source projects started as individual initiatives. Someone failed but another one got inspired and started a better project that succeeded. So it could be me or someone else.The key is to have a powerful open source CAM software.

Hi. Thanks! So far, there is no a specific controller. I will eventually start to develop a specific controller. But currently we have to work with available ones. So, if you want to use a specific purpose toolhead, you must look for ways to adapt it to the controller too.

Once I develop the basic controller, It will be possible to adap a new toolhead easier.

Hi, I am the developer of the PolarBear. Currently I am improving the 3d printable version and preparing the v1 release. Once I finish it, I will start to work on a scalable lasercut sheet metal body one with block rails. I think you are talking about this kind of machine.

If you don't limit the way of machining, you can count microchip manufacturing as machining. So, we can easily talk about nanometers.

If you consider machining only physically removing the material by friction of two different materials, then I think it is practically about 0.001mm. Even this dimension is not always possible. because in this level of precision requires to consider even ambient temperature. If you machine the material with a cold coolant and wait for 10 mins to measure the result. You would end up a bigger part. If you machine it under a warm coolant, then you would end up a smaller part.

Exactly! I actually was thinking to develop an extruder for this kind of projects. But I had to eliminate it for now. May be in future me or you can have time to develop an extruder or adapt an existing one.

Why not. It is the point having a replaceable tool head.

Hi, I am the developer of the project. I am improving the prototype and preparing v1. I will publish more videos when I finish V1 and will demonstrate a complete pcb work. printing, etching, masking etc...

Ah, I need more English practice I think.

Hi, I am the developer of the PolarBear. Thanks for your feedback. I agree with you and tried to add some shortcuts. But I am not a website developer. I can do website. But It is not my profession. I tried to do a nice website in a short time and I used a library named swiper.js I hope soon I can find more time and improve the website or have more funds and hire someone.