Re: [CAD_CAM_EDM_DRO] slave motor for geko 340???

Maybe to install sprockets on the shafts and connect them with the chain?
This should keep them in sync.
Alex

----- Original Message -----
From: Jon Elson <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, November 17, 2002 10:41 PM
Subject: Re: [CAD_CAM_EDM_DRO] slave motor for geko 340???


>
>
> Brent Fuchs wrote:
>
> >I am building a gantry style machine to route wood with.
> >2 of the axises have 2 screws each, I have decided to use
> >a motor for each screw. Is my thinking correct? can I use
> >two servo motors per geko 340 by connection one as a slave
> >with no encoder, just connecting the armature???
> >
> >
> no, absolutely not. Slight variations in the motors, friction, weight,
> etc. will get
> them out of sync very quickly (like less than a second). You need to have
> a home switch on each portion of the axis. This is called a tandem axis
> in CNC
> parlance. It is frequently used on gantry-type machines like vertical
> boring mills
> and bed mills. You would need a separate Gecko servo drive and encoder
> for each
> motor. The gantry or axis will need to be constructed with links and
> bearings so
> the axes will not bind when slightly out of sync. You will have to add
> some logic
> between the CNC computer and the Gecko drives that stops the step pulses
to
> whichever motor reaches the home position first (when in search for home
> mode).
> This should allow both axes to be moved to home. Then this bit of logic
> would
> be switched to normal mode, and let all step pulses through to both
> drives, and
> they should stay in sync as long as they both stay enabled.
>
> If you can't arrange the bearings and links to prevent binding when out
> of sync,
> then you will need to use one motor and belt drives to keep the two screws
> synced.
>
> Jon
>
>
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