big budget cnc

[pet30]

Well a construction wooden beam is 68mmx38mm and kost about 1€ per meter
steel 50x50x3 kost about 3 to 4 euro a meter

so it will be a lot cheaper but jes then i would make it with haf lap joist and srew en glue everything together
everything thats steel will be bolted trough the wood .

and triangulation trusses in both way's?

[Davek0974]

and triangulation trusses in both way's?

Definitely - the frame has to resist the thrust created by the spindle changing direction in all directions so a good sturdy base is essential. Downwards it needs to resist the weight of the material plus the force of the drill or tool etc, no sagging or spring so again, a good firm base is needed.

[Boyan Silyavski]

Without triangulation if you use min 80x80x3. Otherwise as others said.

Forget about "wood" and a "machine" in one sentence, "machine" and "steel" go better.

You constantly use the word "cheap" but i wonder how much you would charge for a custom kitchen and so in Germany? As i know what we charge here Germans in Spain and they find it relatively cheap. Forget that word, make the machine and start making money.

[Desertboy]

You could save yourself a lot of money and time if you buy this but how much it would cost to Germany I'm not sure.

http://www.ebay.co.uk/itm/Linear-mot...wAAOSwCQZZLelQ

I see an almost finished gantry when I look at this

[Boyan Silyavski]

I can not find in posts if sb mentioned it earlier but I think that from Germany this is the best thing he could buy http://www.ebay.es/itm/CNC-Set-20x-1...53.m1438.l2649

Ok, Not Hiwin. But Cheap, in Germany and supported square rail.

[pet30]

thx for the link very interesting
I have changed the design of the machine a bit
Everything will be made out of 80x80x4 mm thick steel
My gantry way's about 50 KG of steel.
I think the supported rails way about 6.6kg and the Z AX about 10 kg .
So in total ist about 66.6 kg but maybe take 80 kg just to be sure.

can i use these motors with a r&p system?
i was thinking going the mechmate way : they hold the pinion against the rail with a spring.





the machine is still in design fase so i can change a lot so if u guy's have more advice let me know

thx

[Boyan Silyavski]

You could move 60-70 gantry with 2x 3nm nema 23 motor driven at 70VDC, as most people on forum do.

The motor you show is nema 34, will have more inertia. Ok, looking at the inductance of it its not too bad, i could say its even good. But you will need to drive it at least 110VDC as per its chart, or even better use 230V main power drives, which are much more expensive than AM822.