Re: [CAD_CAM_EDM_DRO] Re: using a stepper motor for spindle on a lathe

----- Original Message -----
From: "Keith Clark" <mail@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, January 13, 2006 9:21 PM
Subject: [CAD_CAM_EDM_DRO] Re: using a stepper motor for spindle on a lathe


> Bob,
>
> At this point is seems like 2 motors might be necessary unless a servo
> motor could accomplish both. I am going to look at trying to control
> the existing spindle motor fist, then seek out a stepper or servo as a
> second motor. I'll have to figure how to do the wiring as you
> suggested. I might be able to control the switching with the computer
> through relays. The machine has great potential and might even be
> able to do hollowing.....
>
> Thanks,
> Keith
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, bobmcknight@c... wrote:
> >
> > I think that you would definitely want two motors on the spindle.
> > I think I would have two configurations that could be hard wired
> > and switched manually or wired with patch cords.
> > With the router motor supplying the cutting power, the spindle
> > motor would basically just determine how fine the finish is.
> > With the stepping motor driving the spindle, you could do your
> > rope patterns, fluting and engraving. With a motor driving the
> > spindle you could do more conventional turning and bowl turning.
> > Do you ever do any hollow jug turning? Sounds like a real
> > versatile machine that can handle some large projects.
> >
> > bob mcknight
> >
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Organization: Machine-Tech Engineering
> > From: "Bob Muse" <mtebob1@s...>
> > Date sent: Fri, 13 Jan 2006 15:52:29 -0800
> > Subject: Re: [CAD_CAM_EDM_DRO] Re: using a
> > stepper motor for spindle on a lathe
> > Send reply to: CAD_CAM_EDM_DRO@yahoogroups.com
> >
> > [ Double-click this line for list subscription options ]
> >
> > Hi Keith
> >
> > You might want to consider using a large sized servo motor on the
> > spindle
> > rather than a stepper. I think your power requirements for this
> > application
> > are beyond what a stepper is capable of. A servo will have a greater
> > speed
> > range and available torque than a stepper. Servos are available that
> > take
> > step/direction input just like a stepper motor. I am not that
> familiar with
> > machX although I am sure it can do the job, I just use a different
> > program,
> > CNCPro. You might need to have a couple of different machine
> > configuration
> > files depending on what you want to do.
> >
> > The thing to remember about running a machine's axis' on gcode is
> > that
> > everything is based on position. So to just run the spindle like a
> lathe
> > spindle, you could program in however many revolutions (in degrees)
> > that it
> > will take to complete the cut. It might be easier to use the analog
> input
> > to the servo amp to just set a spindle velocity. Many servo amps have
> > selectable inputs step/dir, +/- 10v analog, serial communication etc.
> >
> > What you want to do should be quite feasible.
> >
> > If you are interested I have a couple of large servo motor/amps which
> > take
> > step/ dir etc and might work for you. Email me off list for more info.
> >
> > Regards,
> > Bob
> > ----- Original Message -----
> > From: "Keith Clark" <mail@t...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Friday, January 13, 2006 2:12 PM
> > Subject: [CAD_CAM_EDM_DRO] Re: using a stepper motor for spindle
> > on a lathe
> >
> >
> > > In a prior message Seiman said;
> > > "I do not see why you want to change the spindle to stepper motor as
> > > each one represent a completly different role."
> > >
> > > If I can work through the logic of what is a retrofit of a manual
> > > woodturning lathe into a CNC woodturning lathe with router option...
> > >
> > > I basically have a setup that looks like a metal working lathe with x
> > > and z axis, except that the axes are bolted onto the side of the
> > > woodworking lathe which has its own spindle motor. The z axis is the
> > > carriage that moves down the length of the lathe. The x axis is the
> > > cross-slide that moves the tool cutting bit at right angles to the
> > > lathe bed, but in place of the cutter I have a router mounted. The
> > > spindle motor on the lathe is intact and can be used for high rpm
> > > normal woodturning.
> > >
> > > I would like to then in one instance control the rpm of the motor for
> > > standard CNC turning with a normal cutting bit or router mounted on
> > > the cross slide.
> > >
> > > In the second instance, I would like to be able to mount an engraving
> > > motor or router on the cross-slide and to do engraving, fancy
> > > decorating etc with the spindle now controlled like a 4th axis. In
> > > the standard mode described in the first instance, the spindle motor
> > > turns at a controllable rpm either clockwise or counterclockwise. With
> > > the router mounted, I will be able to rough shapes in very large
> > > diameter logs and do spiral designs with barley twists or rope like
> > > creations on smaller pieces. However, in the 4th axis mode, the
> > > spindle will be stepped in either direction like an axis rather than
> > > like a lathe spindle.
> > >
> > > My problem is trying to understand how Mach3 will deal with these 2
> > > setup options. It seems to me that a stepper motor could offer both
> > > options. Perhaps the stepper motor could handle lower rpm standard
> > > turning jobs with the router mounted and when needed the higher rpm
> > > jobs would be done with the original spindle motor controlled
> > > manually. I realize that there is a resolution issue with larger
> > > diameters in the 4th axis mode that might require a significant gear
> > > reduction.
> > >
> > > Again, this router table is mounted to a woodturning lathe with an 8
> > > foot by 30 inch diameter capacity. That is about the best I can do to
> > > describe the situation. I appreciate eveyone's feedback and
> suggestions.
> > >
> > > Thanks,
> > > Keith Clark
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Seiman H <seiman_h@y...>
> wrote:
> > > >
> > >
> > > > you can have a 3 axis machine with rotary 4th axis but the spindle
> > > still independat it usually works with Z axis in this case which do
> > > not exists at your lathe.
> > > >
> > > > Seiman
> > > >
> > > > Keith Clark <mail@t...> wrote:
> > > > I am wondering if I can use a stepper motor to turn the
> spindle of a
> > > > lathe. I am using Mach3 to control the 2 axis router machine that
> > > > mounts on the woodturning lathe. I will do very slow rpm work,
> > > > shaping vessels with the router machine. It seems like Mach3 is
> > > > capable but the docs do not specifically discuss stepper motors but
> > > > say a step and dir controlled motor will work. Does anyone see a
> > > > problem with this approach?
> > > >
> > > > Thanks,
> > > >
> > > > Keith Clark
> > > >
> > > >
> > > >
> > > >
> > > >
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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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