[qokhanyilmaz]

I wonder that what do you think about this design ? I would like to use for woodworking.

[IMG]
[IMG]
[IMG]

[PaulRowntree]

Have you calculated the deflections at the tool for the materials you are considering?

[ger21]

The Morbidelli we have is very similar, but the Z axis is mounted to the size of the cantilevered "arm". ours is a 5x12, and the "arm" is roughly a 15"x15" box made of welded 1/4" steel plate.

[Phife]

Please, for the love of anything sacred.. do not use unsupported rails anywhere on your machine, they will cause many headaches. they flex way to much to be useful for a wood working machine.

And its even more important to not use unsupported rails on a design like yours since you need all the rigidity you can get with that cantilevered design.

[awerby]

You lose everything you gain (in rigidity) from that massive cantilevered arm by mounting it on rails. Fix that to the floor (bolted down) and it will be a lot better. Instead of trying to move the arm in the X direction, move the table instead. And if that's an unsupported rail in Y and not a ballscrew, replace it with at least two supported ones. But you'd be even better off if instead of leaving the arm hanging in space, you brought it down to earth on the other side, giving you a more conventional (and much more rigid) bridge design.

Andrew Werby
ComputerSculpture.com — Home Page for Discount Hardware & Software

[qokhanyilmaz]

thanks everybody for your thoughts...

[OCNC]

You have the potential to have a huge amount of rigidity built into a table of that size and it would be very inefficient not to make use of it. Go with a bridge gantry.

Chris