Quote Originally Posted by Boyan Silyavski View Post
I said it in other thread : I buy from these guys https://es.aliexpress.com/store/822038 12 and 15 size. Have not bought from them 20 size , but their rails are very good quality and price. Custom size also, contact them. make sure to buy the long carriages.

BST is good for original HIWIN but last time i checked / 2 years ago/ the Chinese rails they were selling were not very good. While the ones from the link above are top notch

Dont rush discarding the C beam. Take a look at my design for a DTG printer base using that C beam and said linear rails+some 3d printed elements:

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This is 12 size Hiwin square, which would happily move 0.8kw spindle. I would say even 2kw spindle if 3 blocks.

But this is not my point. Maybe 15 size and use the C beam like a L shaped gantry. I have never tried it but that's the fun of it, you can figure it out for yourself.
One thing I’m thinking of building is an engraver for spherical objects. I bought an Eggbot yonks ago to check out engraving on a sphere but it’s still in its box.

What I need to engrave for a long term project of mine is two hollow hemispheres. They are part of an Apollo navigation system.

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The reason the hemispheres are hollow is because there are motors and sensors INSIDE them. There is a central disc with an axle going through the middle of it and a hemisphere on either side giving the appearance of a sphere. The disc then has axle point top and bottom and it then mounted in a C clamp and that is powered too... then the C clamp is rotated to give the third access.

I worked out all the control circuitry but the one thing that is holding me up is engraving the hemispheres. Both of them are half black and half white making it even harder.

Anyhoo, my point is I think a heavier guage Eggbot might do the trick... emphasis on the “mighty.