Have you measured the roundness deviation you can achieve when milling a circle? I would generally be interested in the precision and accuracy your machine is able to achieve! :)

hey awesome machine, and quite a bit better desinged than my 5-ax mill......but id like to know how much you spent ? id guess somewhere in the 8-12k range

@@Basement_CNC Thank you :) I honestly don't know what I spent on all the parts and raw material. 8K maybe, but probably a little less...

@@JohnWilliams-qk4ik Unfortunately, my linear ball screws are not preloaded and are of simple quality (T7). The result here would certainly only be moderately good..

​@@9voltprojects thats honestly less than expected 😮 i also spenk 4.5k on my mill, and the quality of most parts is "aliexpress "😂 cant afford more at 19

..just a hobbyist with skilled hands :) Thank you!

ne uno a la idea , seria genial ver el proceso

yeah many videos about cnc ways, but i've never seen one about a self made spindle.

Yes!! The HSK spindle is definitely the most interesting part of the machine.

Vielen Dank, freut mich das Dir meine Konstruktion gefällt :) Da ich keinen weiteren Platz für eine Drehmaschine hatte, musste ich halt erfinderisch sein. Elektronik mache ich quasi seit ich laufen kann, deshalb auch der Eigenbau des Controllers.

:) :) :)

Thanks ;-) Unfortunately, I don't have any video footage of the spindles being built. I'll see if I can find some pictures, then I could try to make a "short" out of it.

@@9voltprojects that would be pretty cool, i'll be waiting for the notification

What a nice compliment :-) Thank you very much!

Ich dank Dir :-)

It's on my to-do list.. Many thanks :)

Thank you very much! I hope I was able to give you a few ideas along the way. :-)

Thank you so much :-)

Thank you so much :)

Thank you, I am very honored :-)

Thank you :-) I've never really understood why so many hobby builders usually build it the other way around. Ok, there is more mass to move, but it is much stiffer and easier to build

@@9voltprojects True, depends a little bit on the aspect ratio of the machine and if it is a traveling gantry or bed but for your machine it looks very fitting.

Thank you very much. I may build a new spindle at the end of the year. Of course I will make a video of it ;-)

Thank You.

Thank you :)

Thank you!

Thank you very much :-)

Vielen lieben Dank!

Thank you a lot :-)

That would be too much stress for me to do business with. I only do it for the joy of doing it :) Thank you very much..

Muchas Gracias

merci beaucoup

Danke :)

Thank you :)

Danke :-)

Большое спасибо.

ありがとうございました。;-)

In my view, the advantages of this design outweigh the disadvantages. The decisive reason for me is the higher rigidity due to the better lever ratios. The lower the working height, the stiffer the working conditions. Of course, the Z-Stepper has to move the entire weight (50 kg). But this is also an advantage because the z-axis is always preloaded. Only the dynnamics is affected by this, of course.

​@@9voltprojects What's your rapid- and acceleration settings if I may ask?

The rapid speed is 2m/min! Unfortunately, I don't know the actual acceleration values. The acceleration ramps are generated in the FPGA by up/down counters preloaded with values. These values then determine the steepness of the acceleration ramps. I then tested different steep ramps in experiments, so that step losses are excluded. But I have never calculated the resulting acceleration values. Thank you for your question! :)

Thank you.. I think anyone with good metalworking skills doesn't need a construction plan or CAD files from me. I've also just copied most of the things from the big boys in the business. Less experienced hobbyists I would advise to start with a smaller project.

I had been looking for the right term while programming. I had thought about fences and borders, but both felt wrong somehow. Yep, boundaries ;-) A bit too long for my display, but let's see... Thank you very much!

@@9voltprojects Even 'Bounds' & 'Left /Right Bound' might suffice ;-)

Sorry, I don't offer kits. I only do it as a hobby. Thank you very much!

Understood. Have you considered sharing your designs either commercially or under a creative commons license or alternative open source license? I believe your machine would be liked by many others who might improve upon your design and share those improvements as well.

Dank Dir!

The spindle bearings are from FAG. I still have to look up all the part numbers. I'll do that together in a future video about building another spindle.

Thank you! I do not use a sensor for tool measurement when turning. I do it like this: After the first machining pass, I zero the displayed position of the Z-axis. Then I measure the diameter of the workpiece with the micrometer. I then enter the radius as the Z position in my control unit. I can work very precisely this way. Additional measuring sensors would tend to interfere with my workflow. I may be a bit old school in this respect, but I like it that way.

Thanks I have some more questions 😄 How do you manufacturing all the parts? With your old machine or on an industrial CNC ? How much time and money did you spend?

Unfortunately, I do not have access to industrial machines. All parts were made on the machine in the intro. Later I made or optimized some parts on my current machine.

You do not need a CAD file for the leveling plates/blocks. They consist of 40x30x10mm steel and an m8 leveling screw in each corner. There is a through hole in the middle of the plate for the rail screw. And that's it. The challenge is to get them all at exactly the same height. For this you need a reference, e.g. a granite ruler or something and a very good dial indicator. It took me a week to get it right, so be warned. The clamps to straighten the rails are very specific to my machine. I don't have a CAD file of them, I made them right out of my head. The rails of my X and Z axis I also straightened with other tools, but that would have been too much for the video. Just build something to bring the force to the point of highest deviation. I was surprised at how easy it is to straighten them.

I noticed for X axis you did not have leveling plate, have you grounded base? Also with leveling plates you need to level everything together, as without central bolt and rail they won’t stay?

I used double-grinded precision steel plates from Meusburger for the bridge of the X-axis and the machine table. That's why I didn't make any further adjustments to the X-axis.

Yes, you're right. This cutter should be cooled ;-)

Yes, that would give me some extra space. But the spindle shaft would have to be able to be fixed absolutely rigidly at the spindle nose. I had no idea how to implement this without making the spindle even bigger and heavier.

@@9voltprojects if it's not achievable electronically with the motor or a brake on the motor then maybe a mechanical pin or an electromagnetic brake/clamp mechanism that engages/clamps into/on the drive pulley of the spindle . There are some limitations to the belted drive rather than direct but a guy with your talents will be able to engineer around it.

@@weldchip Unfortunately, this is not possible with a brake alone. The resulting forces must be kept away from the spindle bearings. Unfortunately, this makes such spindles very large and heavy (DMG, Mazak etc.)

No big plans so far.. I mainly use this machine to make spare parts or to improve appliances for everyday use. Apart from that, the beauty always looks at me when I walk into my kitchen ;-)

Thank you! All spindles were designed and built by me. The HSK tool change interface is from Gühring.

@@9voltprojects thanks you my friend

Thank you and yes, both were built on my machine in the video

​@@9voltprojects Did you have a grinding process? What is the runout, and what rpm are they capable of? I really appreciate what you have done!

Thank you, I do tapping with my own self build controller ;-)

​@@9voltprojects I've seen that and what a side project !! I'm an electronics engineer, and I know what It's like to design stuff that works. (I don't like those FPGA they don't open their minds to debugging easily) I don't know why I fell in love with CNC and metal work, getting outside my comfort zone. I'm in the process of building my second CNC. The first one was crappy little thing more like of a router. I don't want to spend too much time on controller so centroid acornsix will be the way. I was in gantry design with some epoxy granite but after seing your design, I will go your way. What I love is that the whole Y-axis is moving. It's easily understandable that it will be far more stiff when you machine low-height parts compared to those long plate that overhang. One thing that I don't understand. The Z ballscrew attachment...Where is that low end fixing block ? It looks like their is no and that's a really floating side. The only drawback is the protection of the X rails and ballscrew that will be a little more tricky Design spindle is also very nice; maybe this is the part that impressed me the most. It solve one of my issues. Having a strong tool changer without using compressed air (I don't need an ATC). But as I'm not confident enough to try to build a part like that, I'll buy a small and silent compressor, and a Jianken 5.5kw permanent magnet rotor with 3.5Nm with BT30.. I've also see you mixed aluminium and steel to keep it reasonably not too heavy. Is there some point of attention I need to take into account about different thermal expansion between steel and aluminium (for Z lineay rail fixing) or we don't really care ?

@@UPR91 Correct, you should think/care about all the physical relationships when building a machine, including the temperature range and the behavior when using different materials. The higher your requirements in terms of accuracy, the greater the effort. In other words, the greater the temperature fluctuations (day/night) at the installation site, the greater the deviations. Ball screw spindles do not necessarily have to have a floating bearing. It depends on their length.

​@@9voltprojects Thx for the answers. I still have a question as I move forward in the design. How did you square the vertical assembly to the base ? I see some pin to perform an accurate angular the link. Does it fit 90° by precision machining or you squared it and drill after ? Dit you glue the surface with some kind of epoxy before assembly making the whole stuff more rigid but loosing the possibility to further adjustment of dissassembly ?

Correct - Unbelievable ;-) Here in 8mm, they cut very nicely..

Ich habe die Ausgaben nie erfasst, besser nicht ;-)

In the demo, this was also only an 8 mm end mill. And admittedly, the steel was not that hard/strong (C45) ;-) Thank you!

My mill is 50yo, really abused and screams for restoration. Chatter like hell and brake or chip endmils at every possible chance she have 😅

:)

Thank you a lot :-) Please don't be angry with me... I myself have never paid much attention to such tests. Choose all cross sections as large as possible and keep all levers short. That was the approach I took to my own design.

@@9voltprojects You're welcome, the attention to details really shows, keep it up ! I also understand your design principles. Thanks for letting me know. Unfortunately, I myself cannot follow this design approach blindly :/ In fact, I do have a limited weight envelope. Thus, the design of my machine needs to be as efficient as possible. I'm aiming for a high stiffness to weight ratio. That's where FEA analysis can be so useful. In a few minutes, I can roughtly predict how stiff the machine will be. Because a stiff machine is a capable machine, comparing my results to the stiffness measured on existing machines allows me to better understand the machining capabilities I can expect. My home cannot hold a heavy machine and I need a stiff and capable cnc. That's really why I was hoping to get some stiffness measurements by doing an FEA analysis on your 3D model :')

Yes, I understand what you mean and I agree with you. Designing a machine is always a game of compromises and a simulation can be helpful. My CAD can also do FEA simulation but I didn't use it for my machine. Yes, a different approach. You'll get there! Make sure your runner blocks have a high preload class. That can make a difference. Good success..

@@9voltprojects Oh that's right, thanks again 🙂

Thank you!

..not yet on insta

@@9voltprojects I love your milling/ lathe machine this is what i like to built also. It is so clever how you combinate things. How can i contact you ?? Thank you for reply