Re: [CAD_CAM_EDM_DRO] Why don't gantry systems "twist"

In a message dated 11/20/2006 10:51:09 A.M. Eastern Standard Time,
washer@... writes:

I've been looking at photos of gantry based routers, etc. and I cannot see
why the gantry doesnt twist (i.e. varied travel on one side as opposed to the
other).. Are they generally "ganged" using timing belts, or is there a motor
on each side driving the gantry in lock step, etc?

The designs generally don't look stiff enough to mechanicly resist twisting..

- jim



Jim:

On properly designed systems, if they use only one drive motor there will be
a cross shaft using something like a rack and pinion that will prevent the
twisting effect. Of course, this must be designed correctly and the
components sized properly. Another way is to use separate motors on each side that
are "synchronized" via the controller so they run at the same speed, etc and
that will prevent the twisting. However, there are some designs out there that
have attempted to reduce the cost by cutting corners on the gantry and these
often have those twisting problems because of the cutting of costs.
However, a properly designed gantry system works very well and is reliable.


Randy Abernathy
4626 Old Stilesboro Road NW
Acworth, GA 30101-4066
E-mail: cnc002@...

I furnish technical support, repair, and other related services for your
industrial woodworking machinery. My background as Senior Service Engineer for
the SCMI Group for nearly fifteen years with factory training, combines with
my extensive background in electronics, mechanics, pneumatics, electrical and
CNC machinery to offer you needed support for your machinery. Services
include but are not limited to the following:


[Non-text portions of this message have been removed]