Quite an Unusual one

[Boyan Silyavski]

After some thinking, calculating and so on, i believe i have the perfect compromise. Meaning- 1250x2500x200, very simple but robust Z, Z and gantry and bearings that will support the impact hammer. yes, i am still into the metal sheet forming idea. Atr least i would like to be able to try, without breaking the machine.

Basically with the design i achieved a 100mm/3kw/ spindle to have least possible overhang- the bit center from the gantry at ~ 80mm only. The spindle will be packed in aluminum rectangular of a kind. For the impact hammer a shell with the same dimension will be fashioned, so they could be easily interchanged.

I wanted roller blocks on the gantry and everywhere, but will be extremely expensive, and as i am not completely sure for the metal forming success, i decided on 2 roller rails +4 blocks on the Z and all else Hiwin 20 HG. For the sake of vibration and overbuilding i decided to put everywhere else 3 bearing blocks instead of 2. That will make everything rigid enough to withstand continuous vibration and at the end 4 blocks more from china will cost me only 150 euros more, which is irrelevant if the experiment succeeds or fails. having in mind that one roller blocks costs 100eu and 1 meter rail is double the HGR 20 rail price.

The roller blocks and rails for the gantry i found used for 150eu with shipping, so its a good deal.


Now the ball screw on the Z. Obviously with this extremely low overhang there is no place to fit the ball screw. So i fit it aside when i discarded the idea of third profile on the gantry, due to weight. So for the sake of vibrations of the impact hammer, i decided to fit 2 ballscrews. I believe even with one will work if not the hammer. As they are extremely cheap, i want just to be sure and overbuild here

What i want to say that if i had not made any big error, this design is quite sweet looking for a sturdy DIY machine.Take away the 3rd bearing blocks and the second ballscrews from the design/ due to the impact hammer/ and here you have quite simple but sturdy Z with only 80mm overhang to center of router bit from gantry. I am happy.

Any critique will be appreciated. Its not finished but i wanted to share.

PS. Dont worry for the holes placement and assembly, its under control :-) . Some minor changes will be made to the design so everything can fit in place without problems.