Quote Originally Posted by toomast View Post
Can I make it work?
I dont want to go servos on first build :)
Yes it will work thou with 83Kg + gantry you'll have lower feed rates than I posted lower down. Think the gantry on that machine was 50Kg.

Now regards 100mm over 80mm then being totally honest I think this kind of building to excess is unnecssary and the little you gain isn't worth the cost and trouble. 80mm is more than enough for a frame this size. You'll gain more thru less resonance using 80mm or even 60mm but buy a thicker walled tube than going with 100mm thin walled (big base drum) tube.!!. 100mm thick wall tube is expensive and complete OTT for machine this size.

Other than the OTT build strength of the gantry the only thing I see which I'm not sure about is the flimsy looking ballnut supports on gantry ends and Gantry ballscrew.
Also not sure to how your mounting the motor and fastening to ballscrew across the gantry because pics don't show it very well. But it looks like your planning on connecting ballscrew to rear shaft of stepper and mounting stepper to a plate using normal stepper mounting holes.
OR doing reverse and mounting stepper to plate using rear holes and having the front hang out in space connecting to ballscrew.? . . . .Both bad idea.!!

Can you show better pics of what you have in mind.!

On the Bed idea.! I see you have large distance from bed frame to spindle and no adjustment which will be fine for wood etc but no so good for harder materials. So if you don't need all the bed then think about a 2 tier setup with the alumnium cutting area raised up to bring material closer to cutter.
The raised section could be made removable for when full bed needed and using a torsion box setup for stabilty.!