Hi buddies will be this model rigid?

[moody88]

Hi I want ask can i use this construction?
I looking for small machine on wood. plastic occasionally aluminium.

It is not my desing its Masse works form grabcad.
Project is from 5mm steel. I want use 8mm.
Can you give me some answers can be rigid on this type of works?



Sorry for my english.
Thanks for your answers.

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[RCaffin]

Use any construction you want.
8 mm steel? Sounds solid.
The Z axis looks fine, and the Y axis seems OK.
I have some doubts about the X axis: it looks as though it could flex badly. That is, the ends could go up and down a bit.

Cheers
Roger

[posthocfallacy]

Use any construction you want.
8 mm steel? Sounds solid.
The Z axis looks fine, and the Y axis seems OK.
I have some doubts about the X axis: it looks as though it could flex badly. That is, the ends could go up and down a bit.

Cheers
Roger

I agree with RCaffin. The ends might sag a bit, especially the end with the motor when the table at its extreme position. On the other hand, even if it does sag some, the cutting is being done between the supports. If I were to do a machine like this, I would separate the X-axis supports as much as I could. Doing that, however, would force the table to be longer to get the same usable travel, which may or may not be worth the expense. It depends on how much sag at the motor end affects the cutting area. I've never heard of Masse or GrabCAD. I has a huge spindle. I think they are worth a look. Somewhere there has to be a thread on fixed gantry vs. moving gantry that I haven't found.

[dbsharp]

I would design it with a lot more beef under the table. That base is thin and is open on the top. make the base as stout as the column and box it in, get rid of the cool looking holes everywhere, use a thicker plate to attach the x and y axis bearings, add more space between the x axis bearings, and last but not least use some better linear rails... these are not very rigid.

[RCaffin]

I was cutting into Ti 6Al4V with an 8 mm cutter yesterday. It worked fine, within spec, but I loaded the table with many kilos of steel bar to stabilise the thing.
For good CNC work, you need three things: mass, mass, and mass.
(so to speak)

Cheers
Roger