Designing a better bed

[Boyan Silyavski]

Boyan - You are right about the channel section strength but in Britain steel costs a lot than in Spain. There is also the problem that when you hit a piece of steel with a hammer it rings like a bell. That sound is massive shockwaves travelling through the material and forcing air out of the way as it flexes. The 'perfect' cnc machine would be completely silent, there would be zero vibrations that you could introduce into it that would result in a measurable distortion.

You have got it wrong here. If it was a sheet or just box section profile, yes, its like you say. But not in that case. As it happens that i make various musical instruments and trying to make some from steel, all my designs of machines are made so that sound is canceled/ no vibration.

I am telling you here not abstract theory. I have already mounted that UPN 140 profiles and definitely there is no vibration. As the C form is doing just that-cancelling vibrations. There is no ringing whatsoever.

I am sure in UK also the UPN 140 is the cheapest way to go compared to all other variants. Just check a supplier, not local welder. Cause for example if i go to a welder he would sell it to me for 2-3eur kg instead of 1euro kg . Just cause he cut it. hense the Rage saw you see on the pictures of my build. It payed on the first machine i made. Just from ordering directly the 6m material. The funny thing is that the supplier transport of a whole truck of steel costs only 10 euro.

You could fill that C at the back with cement and here you have a winner. Dont over complicate things. Its right here in front of me, tested, super rigid, cheap and does not ring. What more?



Michael,
a simple aluminum plate is a nice solution, however if the hold down of it is not designed properly and not braced where necessary it will ring like a drum skin. Know from experience as i had a machine that did just that because was not well thought.