CAD CAM EDM DRO - Yahoo Group Archive

Re: bridgeport series 1 retrofit

Posted by jlsmith269
on 2004-01-09 09:37:00 UTC
I am also contemplating the sample conversion, with a series II rather
than a series I, for lighter weight work than the machines are
designed for. I can not forsee me EVER having a workpiece over 100#,
as I would be making things like gunparts and ATV parts. I am also
planning on a dividing head/4th axis for making octagon barrels and/or
other neat things.

I thought that the series II probably has servo motors.

I am a complete neophyte on this stuff, so feel free to correct me.

my tenative plan is
1: reuse bp servo motors (if they are servos)
if not, please suggest motors and encoders

2: use the BP Powersupply for running the motors, and use the gecko's
for controlling the servos (right? or am I totally missing external vs
internal to gecko drives)

3: use existing leadscrews on the BP and have the software correct for
backlash. the 1600 bucks for ball screws is just too much.


4: use something like EMC or ramsoft for the PC software.

what do you think? Am I totally off base?

Since the BP II's are going for ~1000-1500 on ebay, if i don't buy
motors (500 each plus mounting hassles) and don't buy leadscrews
(1600) I think this can be done, including rotary phase convertor, for
1500 over the cost of the BP, or less

jeffe

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Robin Szemeti <list@r...>
wrote:
> On Thursday 08 January 2004 22:19, Bob Japundza wrote:
>
> > 1. Stupid question: how can I determine if my motors are capable
of
> > microstepping? This will obviously determine my choice of drives
> > between the G201 or the G210.
>
> umm not really ... the G201 and G210 both produce a microstepped
output, the
> G210 simply has a 'pulse multiplier' on the step pin. Your motors
will be
> fine with either. If I was intending to run on EMC I wuold chose
the 210's
> myself, especially if running on a older PC. they give you a
little more
> flexibility in pulse rates that may help in certian circumstances.
>
> there are lots of 'bridgeport specific' bits in EMC, it will work a
treat.
>
> > 2. Would a 77vdc power supply with some large caps on the output
> > sufficiently filter out ripple and not damage the Gecko's? I'm
> > concerned that my power supply may be a wee bit too close to the
80v
> > rating for the Gecko's.
>
> I'd drop that to half voltage by fiddling the tappings if you can...
40V is
> more than sufficient in general .. there seems to be a 'as many
volts as
> possible' theory that comes from somewhere, that leads to nothing
other than
> hot drives and hot motors .. 80V is pushing it a bit I think ...
esp. onhte
> day when the mains goes a bit high ....
>
> > 2. Is it possible to use EMC (or any other cnc package for the
> > matter) to drive steppers with a DRO serving as a closed-loop
> > system?
>
> EMC at one stage in time had support for the mauch/kaluga DRO card.
its still
> there in the codebase AFAIK
>
> > Some of the DRO's I've looked at have a RS-232 output, and
> > am wondering if there's a 'standard' for DRO outputs so they could
> > be integrated in a closed-loop system. I'm thinking of building
one
> > of Scott Shumate's DRO-350's.
>
> it is extremely unlikely that you could use a serial DRO system in a
servo
> control loop ... the main problem is the inevitable delays of the
serial link
> reducing the phase margin of the loop. Oscillation is almost
guarenteed I
> would imagine.
>
> However ... you'll find the leadscrew and backlash compensation in
EMC can
> map the leadcrews of a bridgeport every inch or so, and differently
in both
> directions to take account of wear so it should come out pretty much
spot on.
> The DRO's are very helpful in setting this up.
>
> > Any help would be greatly appreciated.
>
> call in on the EMC users list on Sourceforge or on IRC:
>
> server: irc.freenode.net
> channel: #emc
>
> always some people on ..
>
> --
> Redpoint Consulting Limited
>
> Real Solutions for a Virtual World
> http://www.redpoint.org.uk

Discussion Thread

Bob Japundza 2004-01-08 14:19:29 UTC bridgeport series 1 retrofit Robin Szemeti 2004-01-08 16:54:10 UTC Re: [CAD_CAM_EDM_DRO] bridgeport series 1 retrofit Jon Elson 2004-01-08 19:55:27 UTC Re: [CAD_CAM_EDM_DRO] bridgeport series 1 retrofit luvindaddy@y... 2004-01-08 20:43:31 UTC Re: bridgeport series 1 retrofit John Johnson 2004-01-09 04:02:54 UTC Re: [CAD_CAM_EDM_DRO] bridgeport series 1 retrofit Ray Henry 2004-01-09 05:58:57 UTC Re: Re: bridgeport series 1 retrofit Bob Japundza 2004-01-09 08:38:03 UTC Re: bridgeport series 1 retrofit jlsmith269 2004-01-09 09:37:00 UTC Re: bridgeport series 1 retrofit Bob Japundza 2004-01-09 12:30:48 UTC Re: bridgeport series 1 retrofit Tim Goldstein 2004-01-09 16:12:30 UTC RE: [CAD_CAM_EDM_DRO] bridgeport series 1 retrofit Ray Henry 2004-01-09 19:40:07 UTC Re: Re: bridgeport series 1 retrofit Jon Elson 2004-01-09 21:51:39 UTC Re: [CAD_CAM_EDM_DRO] Re: bridgeport series 1 retrofit Jon Elson 2004-01-09 21:54:52 UTC Re: [CAD_CAM_EDM_DRO] Re: bridgeport series 1 retrofit bull2003winkle 2004-01-10 12:29:26 UTC Re: bridgeport series 1 retrofit ibewgypsie 2004-01-10 17:20:58 UTC Re: bridgeport series 1 retrofit Myron Cherry 2004-01-10 22:20:02 UTC Re: [CAD_CAM_EDM_DRO] Re: bridgeport series 1 retrofit bull2003winkle 2004-01-10 23:18:26 UTC Re: bridgeport series 1 retrofit Harvey White 2004-01-11 07:19:42 UTC Re: [CAD_CAM_EDM_DRO] Re: bridgeport series 1 retrofit Bob Japundza 2004-01-12 10:31:34 UTC Re: bridgeport series 1 retrofit Ray Henry 2004-01-13 07:49:22 UTC Re: Re: bridgeport series 1 retrofit Robin Szemeti 2004-01-13 08:16:13 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: bridgeport series 1 retrofit Bob Japundza 2004-01-13 09:01:08 UTC Re: bridgeport series 1 retrofit Ray Henry 2004-01-13 10:18:19 UTC Re: Re: bridgeport series 1 retrofit jlsmith269 2004-01-14 05:43:26 UTC Re: bridgeport series 1 retrofit