# Re: Alternate Mill Geometry?

Cliff wrote:
>
> On Fri, 7 Oct 2005 20:14:50 -0700, "PrecisionMachinisT"
> <precisionmachinist@xxxxxxxxxxx> wrote:
>

> >> > To get 40" of travel at the spindle he's probably
> >> > still going to need closer to 80", if not more.

> >> On a vertical mill with 40" table travel the table will obviously
> >> extend 20" on EITHER side to accommodate full travel (a lot of tables
> >> are more than 40" long in X to begin with, so THAT extension has to be
> >> added to any calculatIons for certain machines.
> >> On some horizontals the spindle moves, and theoretically the spindle
> >> only has to move the 40". The actual width would be a little bit more
> >> to accommodate the linear guide support. Probably not anything near
> >> 20"+ on either side like a vertical mill table needs.
> >>
> >> Cliff, when was the last time you were actually in a shop looking at a
> >> horizontal mill? LOL
> >>
> >
> >Might get away with a minimum of 64in long linears for light milling
> >applications, in non ferrous, plastics, and the like...but I probly wouldn't
> >want to go up very high in the z axis....
> >
> >This would leave you a 20in 'end to end' distance on your trucks, with them
> >being 10in past the end of a 40in table at both ends of stroke, ( including
> >a 2in "safety zone" at each end )...
>
> SVL,
> Looks like both of us know such machines and have used them
> & BB's just guessing again <G>.
> You just have to admire that.

Cliff:

Silly Wabbit. We have a Making horizontal in our shop. I've
programed, setup, and used this machine (a traveling column or perhaps
more descriptive, a moving spindle machine). Now I'll admit that its X
travel is only about 18", but it takes very little extrapolation to
envision what it would be like if it had 40" of X travel.
We have a 22" X 16" Fadal and it is a MUCH wider machine, much more
than the 4 inch different between 18" and 22" would indicate. As you
correctly guessed above, the larger the X travel on a moving table
machine the more disparity will show up when compared to a traveling
column machine. So a 40" traveling column horizontal will in all
probability be significantly narrower than 40" Vertical machine.

--
BottleBob