Accurate Strong Gantry

[Boyan Silyavski]

The Hiwin HGR are double row bearing blocks and there is no difference how you mount them, so don't worry about that.

For a router HGR20 is enough and even a bit overkill, depending on the design. So no worry here also.

[Ross77]

Ok, I'm a bit confused. You keep saying fixed gantry but then you show a bed with rails on the side.

Is this the bit that will be moving? If so I would have said that it is not the best way to do it. Moving beds should have the rails underneath and at approx. third points or a quater in.

That way the rails are supporting the load better and are closer together so you can get away with one ballscrew.

As you have drawn it the bed can bend in the middle under load.

[vargai]

Ok, I'm a bit confused. You keep saying fixed gantry but then you show a bed with rails on the side.

Sorry for being double meaning.
I have started the thread with the moving gantry principle and as the design and details developed according to the useful comment from the site two days ago especially after having Dean's #41 post I have changed my mind .
My intention was not to leave my earlier ne'er-do-well concept and correct it.
This is the case when the design concept turn to other way so I put this moving gantry into a drawer now and finish this chapter.
I will start a new thread with it when it is actual again.
So I am giving thanks everybody and I am at full pelt with the fix gantry from now on.