RE: [CAD_CAM_EDM_DRO] plasma bridge

Hello Les,

In what form did you use mild steel as a track? Ive been going back and
forth with ideas...dual vee,or a round tgp shaft with 2 bearings oposing
each other riding at 45deg on it(I was told its an old esab design), or
pillow blocks...

So am I understanding you are putting your bridge is intention by using the
spring loaded skate bearing?

What do you think about making the bridge out of aluim.? Isnt aluim stiffer
than steel?

You build furniture dont you? I thought I saw a link to your web site a long
time ago.. Do you do highpoint? We tried it many years ago but prooved to be
too much work.

Thanks again
Chris



-----Original Message-----
From: Les Newell [mailto:les@...]
Sent: Saturday, March 08, 2003 2:54 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] plasma bridge


HI Chris,
My plasma gantry is about 5' and rapids at 400 IPM with no problems. I have
had it running over twice that speed but it occasionally loses steps at high
speed. It is built like a T-square - the cross of the T uses spring loaded
skate bearings about 19" apart, running on a mild steel track. The other end
has a single skate bearing to take the weight. It is not exactly the
ultimate in precision machining but it is perfectly adequate for the work I
do.

My bridge is lighter than yours - I tried to keep the weight down as much as
possible. There are two reasons for the weight reduction exercise. Firstly
it gives better acceleration and secondly the machine is winched up into the
ceiling when not in use. I don't have enough spare space to have a 10" x 6"
machine sat on the floor all the time.

Les

> Has anyone built a plasma table driving a 5ft bridge or gantry from
> just one side? if so have you had any problems with it?
>
> Is there a formula to caculate how much force there will be on the
> side of the bridge that follows when it changes direction at max
> speed?
> I know my bridge ways about 40#s as it is curently designed, that I
> will be looking at speeds up to 400ipm in that axis and will be using
> dualvee type bearings.
>
> Thanks for all the help from everyone Im finally getting close!!
>
> Chris
>
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sister site to the CCED group, as many of the same members are there, for OT
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