I guess I am not clear then what you are trying to do then?..
Trying to enlarge the hole in the top plate of a tower?...If you are
leaving the top plate intact on the tower...all the set up and bracing and
getting somewhat true the the centerline on the rotated head...and supporting
the length of the tower section with top to be bored?...WOW!...and speaking of
no rigidity...Rube Goldberg scenario!
Plasma cut on even a galvanised part is nowhere near as "fumey" as what you
would get with a flame cut or trying to weld it...and depending on the
speed and feed...you'd get zink from the cutter airborn..just use a box fan if
your worried while cutting with palsma..
And if your looking for a pretty cut?..plasma would be nice and clean...and
who is gonna see it and comment on a cut hole verses a bored hole when the
tower is full up?...I can make a nice and clean hole with plasma and no
problems on thick or super thin material galvanised or not...with no
distortion. Including bolt holes.
And if you are using a fly cutter to bore or enlarge a hole...you have more
problems coming at you than trying to make a pretty hole!!..WOW! Scary
stuff!
73
Mike W2GR
------------------
In a message dated 4/9/2016 7:08:42 P.M. Eastern Daylight Time,
K8RI-on-TowerTalk@tm.net writes:
I have both a Plasma torch and a Bridgeport mill.
The plasma torch is hand held and cuts great, but hand held (even using
a guide) is no where near as nice as the Bridegport.
A rough set up is all that is required on the Bridgeport. No need to
use a dial indicator to get it to the nearest thousandth. Just square
up the head with the surface to be cut. Just use an adjustable cutter,
or a fly cutter. I don't like fly cutters. They work well, but I don't
like that cutter flying around.
The accessory plates would require no changes from the vertical set-up.
In addition there are no poisonous fumes from the high temp.
73
Roger (K8RI)
On 4/8/2016 Friday 8:03 PM, Mike via TowerTalk wrote:
> Huh?...Really?
>
> The set up on that would be a bear!..
>
> A plasma cutter and a bit of layout you'd be done before you could set
the
> mill head....just sayin'.
>
> 73
>
> Mike W2GR
> ----------------
>
>
> In a message dated 4/8/2016 7:06:29 P.M. Eastern Daylight Time,
> K8RI-on-TowerTalk@tm.net writes:
>
> I could rotate the head on the milling machine and bore out the opening
> in the tower top plate to take a 3" mast and bearings, but at this
> point, it's hardly worth the effort.
>
> 73
>
> Roger (K8RI
>
> _______________________________________________
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