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

Jim,

Racking or twisting can be a real problem with a gantry system depending on
the design and parts used. Designers that have created a good design will
not have a problem.

Many good designs like the ez-router www.ez-router.com drive both sides of
the X axis with separate stepper motors. This is common practice. Mach has
provisions for squaring the table when the user homes the X axis.



Robert Colin Campbell
Bob Campbell Designs
www.Campbelldesigns.com
Mach 2/3 breakout boards
Relay boards
Spindle Speed boards
Stepper motors
Plasma Torch Height control

----- Original Message -----
From: "James Washer" <washer@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, November 20, 2006 1:14 AM
Subject: [CAD_CAM_EDM_DRO] Why don't gantry systems "twist"


> 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
>
>
>
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