CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions 1:1 ratio

Posted by R Rogers
on 2005-01-29 15:03:23 UTC
Three Ameteks would work probably. They are like $20 each if you look hard enough. I think "Silicon salvage" has them on Ebay for about that price, they did anyway. 5/8" shaft, 40 volts DC and like 1200 RPM if I remember correctly. And I just learned today on here those can be ran at higher voltage through the Gecko. Just put an encoder on them. It would be worth a try. I know one guy was selling a 2 axis retrofit package for series1 BP's and that was the motors he offered. They sell them all the time on Ebay with encoders for like $100 ea.

Ron

braidmeister <braidmeister@...> wrote:


Ron,
FYI, this is a BOSS machine. It was designed 100% for CNC with no
other purpose ~ according to Bridgeport specs. It is not a manual
mill converted to CNC.

The knee is manual to accomodate variations in material height. The
knee is not driven by the stepper. Only the quill/spindle shaft moves
in Z ~ quite a big difference in mass to move. The Z motor moves just
as easily as the X & Y ones, by hand turning a small 2.5" pulley with
my fingers.

To those of you that are going to try moving the pulleys by hand, do
so with the controls/power OFF. 1st reason being that quick movement
can acutally turn the motor into a generator and smoke the
driver...2nd and more importantly, a stepper has max holding torque
at zero RPM...once you break the magnetic lock on the motor and your
fingers are in there...It WILL BITE YOU!!! Don't ask how I know!
(Actually I knew this before hand in theory...but forgot) :)

-Brady




--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers
wrote:
>
>
> braidmeister
wrote:
>
>
> Ron,
> I get what you are saying about 4th gear. I will try them 1:1 1st,
> and if need be, I will reduce to a 2:1 or better ratio. No sense in
> spending the $ for pulleys and belts if it is not necessary.
>
> In all actuality, yes it is a 3100 RPM servo @ 130 vdc. Since I am
> planning on running them @ 75v max, then I will have a max RPM of
> only about 1700. That brings the rapids down quite a bit. I doubt
> that I will need the full 2HP of the motor since I can easily move
> the axes by hand turning the pulley.
>
> /// We discussed the power input at the screw just recently. A
handcrank has about a 6" diameter path of travel, 3" radius. A crank
revolved 1 rev constitutes about 18.84 " of circular travel. This
circular distance produces .200" inches of linear table travel (5
tpi). Or 94.2:1 ratio. Each pound of force presented to the handle of
the crank equals 94.2 lbs of linear force. 10 lbs , roughly 1/2 ton.
So, servo torque is really not that big of an issue. The little
Ameteks will work for X and Y. Except in the case of Z driving the
knee. Different situation altogether. About 800lbs going up, coming
down is no problem. And then add a large bit hogging out material...Z
is the biggest headache by far. Put the biggest motor you can power
on it. I only get 50 ipm out of Z with a 40 in-lb motor. ///
>
> bounce things back and forth on...to me it is 100% American ~
Better,
> cheaper, faster
>
> /// As I told an engineer recently about those attributes, pick
two, ya can't have all three.///Ron
>
> & elimination of the middleman for those of us who
> know how to turn a wrench.
>
> -Brady
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers
> wrote:
> >
> >
> > braidmeister
> wrote:
> >
> >
> > No I was the one throwing planes!!
> >
> > Yes, that's the motor in question. It seems to me that it would
be
> an
> > ideal fit for the BP. I am hoping that I can get away with 1:1
and
> a
> > decent encoder.
> >
> > /// Trying to run a 3100 rpm servo 1:1 to a 5 tpi ballscrew will
> produce rapids of 620 ipm. One needs from 2:1 to 3:1 reduction on
all
> 3 axies using servos (driving the knee, its half the increment of X
> and Y per rev.). Simply increasing encoder count to attain
resolution
> is not practical. An E5S-200 encoder, Gecko 320's and Mach2 work
> perfectly together using the above ratios. 1:1 ratio is like
driving
> a car around in 4th gear. Servos operate best at 80% of their rated
> RPM. I just ordered a set of pullies from mcmaster carr three L
(.375
> pitch)series 30 tooth (3.5" dia) and three L series 12 tooth ( 1.4"
> dia) for a 2.5:1 setup/// Ron
> >
> >
> >
> > [Non-text portions of this message have been removed]
>
>
>
>
>
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Discussion Thread

braidmeister 2005-01-28 12:40:56 UTC Bridgeport retrofit servo questions Les Newell 2005-01-28 15:41:29 UTC Re: [CAD_CAM_EDM_DRO] Bridgeport retrofit servo questions braidmeister 2005-01-28 15:59:12 UTC Re: Bridgeport retrofit servo questions Les Newell 2005-01-28 18:35:07 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions braidmeister 2005-01-28 19:09:59 UTC Re: Bridgeport retrofit servo questions Mariss Freimanis 2005-01-28 19:57:03 UTC Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-28 20:17:01 UTC Re: Bridgeport retrofit servo questions braidmeister 2005-01-28 21:04:47 UTC Re: Bridgeport retrofit servo questions Mariss Freimanis 2005-01-28 22:47:54 UTC Re: Bridgeport retrofit servo questions Les Newell 2005-01-29 02:54:57 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions Les Newell 2005-01-29 03:42:06 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions Les Newell 2005-01-29 03:49:09 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions AbbyKatt 2005-01-29 04:59:52 UTC Max voltage for a stepper motor? washcomp 2005-01-29 06:18:26 UTC Re: Bridgeport retrofit servo questions turbulatordude 2005-01-29 07:23:32 UTC Re: Max voltage for a stepper motor? braidmeister 2005-01-29 08:23:15 UTC Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 08:44:59 UTC Re: Bridgeport retrofit servo questions Fred Smith 2005-01-29 08:55:24 UTC Re: Bridgeport retrofit servo questions Luke1027 2005-01-29 10:30:01 UTC Re: [CAD_CAM_EDM_DRO] Bridgeport retrofit servo questions Luke1027 2005-01-29 10:32:30 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 10:55:30 UTC Re: Bridgeport retrofit servo questions Les Newell 2005-01-29 11:03:21 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 11:10:37 UTC Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 11:14:10 UTC Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 11:17:35 UTC Re: Bridgeport retrofit servo questions Luke1027 2005-01-29 11:22:52 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 11:27:02 UTC Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 11:33:38 UTC Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 11:39:04 UTC Re: Bridgeport retrofit servo questions washcomp 2005-01-29 11:47:14 UTC Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 11:48:20 UTC Re: Bridgeport retrofit servo questions Luke1027 2005-01-29 11:54:05 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 11:55:42 UTC Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 11:57:29 UTC Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 12:01:44 UTC Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 12:01:46 UTC Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 12:06:34 UTC Re: Bridgeport retrofit servo questions Luke1027 2005-01-29 12:08:49 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 12:11:35 UTC Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 12:16:04 UTC Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 12:17:27 UTC Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 12:33:35 UTC Re: Bridgeport retrofit servo questions Luke1027 2005-01-29 12:50:33 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 12:52:13 UTC Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 12:54:59 UTC Re: Bridgeport retrofit servo questions Les Newell 2005-01-29 13:16:21 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions Les Newell 2005-01-29 13:17:14 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions Les Newell 2005-01-29 13:25:03 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions R Rogers 2005-01-29 13:27:44 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions 1:1 ratio braidmeister 2005-01-29 13:44:26 UTC Re: Bridgeport retrofit servo questions 1:1 ratio R Rogers 2005-01-29 14:24:38 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions 1:1 ratio braidmeister 2005-01-29 14:45:15 UTC Re: Bridgeport retrofit servo questions 1:1 ratio Dan Mauch 2005-01-29 14:53:48 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions R Rogers 2005-01-29 15:03:23 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions 1:1 ratio braidmeister 2005-01-29 15:16:26 UTC Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 15:16:41 UTC Re: Bridgeport retrofit servo questions 1:1 ratio braidmeister 2005-01-29 15:43:11 UTC Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 15:43:14 UTC Re: Bridgeport retrofit servo questions R Rogers 2005-01-29 16:02:14 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions 1:1 ratio braidmeister 2005-01-29 16:03:38 UTC Re: Bridgeport retrofit servo questions R Rogers 2005-01-29 16:12:14 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 16:28:32 UTC Re: Bridgeport retrofit servo questions 1:1 ratio cnc_4_me 2005-01-29 16:37:44 UTC Re: Bridgeport retrofit servo questions Luke1027 2005-01-29 16:58:42 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions braidmeister 2005-01-29 17:19:43 UTC Re: Bridgeport retrofit servo questions Luke1027 2005-01-29 17:38:01 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions R Rogers 2005-01-29 18:37:22 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions 1:1 ratio braidmeister 2005-01-29 18:45:12 UTC Re: Bridgeport retrofit servo questions cnc_4_me 2005-01-29 19:31:14 UTC Re: Bridgeport retrofit servo questions 1:1 ratio R Rogers 2005-01-29 20:11:41 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions 1:1 ratio cnc_4_me 2005-01-29 20:18:25 UTC Re: Bridgeport retrofit servo questions 1:1 ratio R Rogers 2005-01-29 20:42:49 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions 1:1 ratio R Rogers 2005-01-29 20:47:01 UTC CNC wiring PDF updated cnc_4_me 2005-01-29 21:53:21 UTC Re: CNC wiring PDF updated Les Newell 2005-01-30 01:27:17 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions Polaraligned 2005-01-30 06:52:44 UTC Re: CNC wiring PDF updated Robert Campbell 2005-01-30 07:14:22 UTC Re: [CAD_CAM_EDM_DRO] CNC wiring PDF updated R Rogers 2005-01-30 08:27:45 UTC Re: [CAD_CAM_EDM_DRO] Re: CNC wiring PDF updated Dan Mauch 2005-01-30 09:48:22 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions Luke1027 2005-01-30 10:36:30 UTC Re: [CAD_CAM_EDM_DRO] Re: CNC wiring PDF updated braidmeister 2005-01-30 12:09:41 UTC Re: CNC wiring PDF updated John Stevenson 2005-01-30 15:22:13 UTC Re: CNC wiring PDF updated R Rogers 2005-01-30 16:41:50 UTC Re: [CAD_CAM_EDM_DRO] Re: CNC wiring PDF updated Jon Elson 2005-01-30 17:00:45 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions Stephen Wille Padnos 2005-01-30 18:50:15 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions braidmeister 2005-01-30 19:18:25 UTC Re: Bridgeport retrofit servo questions Dan Mauch 2005-01-31 09:29:32 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions Jon Elson 2005-01-31 10:17:20 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions Stephen Wille Padnos 2005-01-31 10:23:13 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions John Rouche 2005-01-31 10:36:10 UTC Re: Bridgeport retrofit servo questions Jon Elson 2005-01-31 23:01:09 UTC Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions m0nkey0ne 2005-02-02 14:23:04 UTC Re: Bridgeport retrofit servo questions