Re: [CAD_CAM_EDM_DRO] Re: BOSS5 to Mach2/Gecko

Not sure who your asking Wally but mine is belt drives with what I believe
is 2-1 ratio.

Have not decided on Geckos or? yet, still in the learning stages of this
project.

Scott L Golden
www.twwrc.homestead.com/current.html
Never Give Up

----- Original Message -----
From: "cnc_4_me" <cnc4me@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, January 22, 2005 8:56 AM
Subject: [CAD_CAM_EDM_DRO] Re: BOSS5 to Mach2/Gecko


>
>
> Hi, I am also doing a bridgeport retrofit and am using
> steppers...Your post was very interisting, and i have a few questions
> about it...
>
> 1. Are your steppers directly driving the screw or are you using a 2
> to 1 belt reduction drive.
>
> 2. Are you using the Gecko G201 or the G210. And how are you
> driving the inputs to these drives. Full step, half step or micro
> step.
>
>
> Wally
>
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ja_erickson"
> <ja_erickson@y...> wrote:
> >
> > Evening All,
> >
> > I have been doing my Boss5 retrofit project for some time now and
> > have done exactly what you want to do with the exception of the
> power
> > supplies. i built my own 72 volt/7 amp toroidal power supplies and
> > used gecko g210's with pretty good results. I rewired the original
> > bridgeport steppers to run in "half winding" which will provided
> more
> > low speed torque. according to my bridgeport manuals the original
> > steppers were designed for 68 volts and 6.8 amps which is right on
> the
> > upper side for the geckos. I was concerned about it until i spoke
> to
> > the owner of gecko drives and he assured me that 72 volts and 7 amps
> > would be alright for the 201/210 series. he also warned that it
> would
> > be WISE to incorporate a "return energy dump circuit" in order
> > to protect the drive against any "returned energy" from the motors
> > during sudden stops.neither the drives or the motors ran hot so
> fans
> > for the drives were not needed.the campbell breakout board is a
> must
> > have item becuase it really provides alot of interfacing in a
> > relatively small footprint, well worth the cost. motor tuning with
> > mach2 went really smooth, just dont expect the machine to move like
> a
> > new c.n.c., the machine would lose steps if the accelerations were
> to
> > great and i think i could achieve 60-80 i.p.m. reliably.however
> there
> > was a problem with the system in the end where any feedrates below 4
> > i.p.m. were very steppy, by this i mean you could put your hand on
> > the table and actually feel the motors step. i couldnt have that
> > because i was afraid of tool marks on the workpiece. i talked with
> > the owner of gecko drives and he helped me all he could to rectify
> > that situation but we couldnt get rid of that steppiness. if that
> > situation doesnt bother you then i wouldnt hesitate to retro it.
> >
> > Jeff
>
>
>
>
>
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