Re: Bridgeport retrofit servo questions

haha, i can't do that...my bridgeport is and always has been fully
manual...Thats why i ask questions about yours...To get ideas on how
to convert to cnc....

Wally



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "braidmeister"
<braidmeister@y...> wrote:

>
> Wally,
> Pull the front cover off of the pulley housing on your Y axis. Look
> at it. With power OFF, put a mark on each pully in the same clock
> position. Turn one of them by hand. If they go 1 full rev, and the
> marks are in the same spot, then you have 1:1. If not, then count

the

> number of revs it takes until they are in the same spot and

calculate.

>
> -Brady
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnc_4_me" <cnc4me@g...>
> wrote:
> >
> > Well, now i am confused...I thought bridgeport went to 2-1

pulleys

> > with steppers...if they are 1-1 why didn't they just mount motor

on

> > the end of the screw, with a flex coupling...
> >
> >
> > Wally
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "braidmeister"
> > <braidmeister@y...> wrote:
> > >
> > > The X and Y are running 1:1 right now for sure. The Z I cannot
> tell
> > > at the moment because the pulley is buried in the head. Most
> likely
> > > it is 1:1 as well. All of the axes move with authority with the
> > stock
> > > steppers...this is of course after replacing a bad power
> transistor
> > > to get the Y working again. Just jogging the axes around

doesn't

> > > really thrill me...I already have 2 CNCs that actually cut...I
> have
> > a
> > > bad ERS board, so remote data is not happening at the moment.
> > >
> > > -Brady
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnc_4_me"

<cnc4me@g...>

> > > wrote:
> > > >
> > > > Brady, can you tell me what the pulley ratio's are for your

x,y

> > and
> > > > especially Z axis is...
> > > >
> > > > Wally
> > > >
> > > >
> > > >
> > > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Luke1027
> <luke1027@p...>
> > > > wrote:
> > > > > Hello Brady,
> > > > >
> > > > > I am in the EXACT same Boat with my Boss5.
> > > > > I have the EXACT Same Questions.
> > > > > I am looking for the EXACT same solution.
> > > > > This however is not my "Bread & Butter", just trying to get

it

> > > > > working without losing steps and add much more memory for
> long
> > run
> > > > > NC CAM programs (3D-Surfaces).
> > > > > Can I ask what motors you decided on and where you are
> getting
> > > them?
> > > > > I too am trying to do this without spending too much $$$.
> > > > > I can tell by your questions and answers you are FAR more
> > > > > knowledgable in doing this retrofit then I have.
> > > > > I will be tracking this thread VERY closly ... Please share
> > what
> > > you
> > > > > end up with -- Pros & Cons you may run across on the way.
> > > > >
> > > > > Luke
> > > > >
> > > > > "I have no idea how much weight I will be pushing around

with

> > the
> > > > BP.
> > > > > I have picked out motors that are economical, similar in
> power
> > > and
> > > > > performance of 'real' servo motors that the expensive
> > > > upgrade 'kits'
> > > > > use, and generally what I 'think' will get the job done.

For

> > the
> > > > time
> > > > > being, I am just looking for a decent combination that will
> get
> > > me
> > > > > 120 IPM rapids and excellent repeatability.
> > > > >
> > > > > -Brady"
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Luke,
> > > > > luke1027@p...
> > > > >
> > > > > braidmeister wrote:
> > > > >
> > > > > >OK guys...I've been reading posts on here for the past few
> > days
> > > > > >regarding servo motors. After replacing a dead power
> > transistor
> > > in
> > > > my
> > > > > >BOSS 5 Bridgeport (just got it....Y axis DOA)...and

spending

> > way
> > > > too
> > > > > >much time trying to interface to what appears to be a bad
> ERS
> > > > board
> > > > > >(via serial)...I am now heading towards doing a complete
> > > retrofit
> > > > of
> > > > > >the controls using Mach2.
> > > > > >
> > > > > >I'm on the fence about whether to retain the working
> steppers
> > > and
> > > > use
> > > > > >Larken stepper drives ($200 ea....up to 16A/ph) plus some
> type
> > > of
> > > > > >appropriate power supply, Campbells breakout and Mach2.

The

> > down
> > > > side
> > > > > >of this may be that the machine doesn't move as fast as

the

> > BOSS
> > > > > >control can move it...but this is based on feedback from
> > several
> > > > > >Gecko users on a BP. I am not looking to break any speed
> > > > > >barriers...but 50 IPM rapids aren't going to cut it. I

need

> > > > something
> > > > > >that can handle running several hours at a time. I saved

for

> a
> > > > while
> > > > > >to get the BOSS...now I have to scrape some $ together to

do

> a
> > > > > >conversion...just so I can run the thing. I really don't
> want
> > to
> > > > do a
> > > > > >conversion twice (always time for that, right guys??!!)
> > > > > >
> > > > > >The other choice that I have is to go with servos. The BP

is

> > > > > >definately well into the servo side of the servo/stepper
> > choice
> > > > > >threshold. Not partial to Gecko or Rutex as either will do
> > > > (actually
> > > > > >I am because the Geckos are cheaper). I have read that
> several
> > > of
> > > > you
> > > > > >suggest using some of the treadmill-type motors available
> from
> > > > > >surplus center. There are several DC dual shaft motors

there

> > > with
> > > > > >pros and cons to each. I am curious as to what models

would

> be
> > > > best
> > > > > >for a BOSS machine. Here are a few that were

mentioned...and

> a
> > > few
> > > > > >more that I picked out: (All listed can be found on this
> page:
> > > > > >http://www.surpluscenter.com/sort.asp?
> > > > > >UID=2005012813411678&catname=electric&keyword=MBDD )
> > > > > >
> > > > > >1. $30. 10-1573 ~ 5100RPM rear shaft long enough for

encoder

> > off
> > > > of
> > > > > >10-1834. Rated at 1.5 HP & 110v. Does this have enough

juice

> > for
> > > > the
> > > > > >BP @ 75v? Current not advertised other than 1.4A no load.
> > > > > >
> > > > > >2. $22. 10-1783/10-1783-A 2.5 HP rating 6750 RPM 18.5A

130v

> > int
> > > > duty,
> > > > > >95v continuous. Back shaft only .25" long. Will have to
> extend
> > > to
> > > > use
> > > > > >any type of encoder. I am guessing that this would be a

good

> > > motor
> > > > if
> > > > > >run @ 75v/18.5A (within Gecko specs)...only thing I

question

> > is
> > > > the
> > > > > >RPM/belt reduction. What ratio do you think is best on the
> BP
> > > with
> > > > > >this motor?
> > > > > >
> > > > > >3. $80. 10-1906 2.0HP 130v/15A 3210RPM Continuous duty.

Has

> > good
> > > > > >shafts for driving and encoding. Shipping wt

24#s...starting

> > to
> > > > get
> > > > > >heavier. This seems like a good motor...the current rating
> > tells
> > > > me
> > > > > >that it has some cookies and the RPM is half of the

previous

> > > > > >one...helping to curb insane reduction ratios.
> > > > > >
> > > > > >4. $90. 10-1723 1.5HP 111v/7.6A 3100RPM 2-4hr rated
> continuous
> > > > duty.
> > > > > >Looks like a good motor as well...but it is a pig. Ship wt

@

> > 30#
> > > > and
> > > > > >13" long...not liking that, but rotor inertia makes up for
> the
> > > > length.
> > > > > >
> > > > > >What do you think??? I think #3 so far might be a
> winner...yes
> > > it
> > > > is
> > > > > >more $ than 1 & 2, but it has a beefy shaft on it, long
> enough
> > > in
> > > > the
> > > > > >back for an encoder and the RPM isn't outlandish. I'd like
> 120
> > > IPM
> > > > > >rapids and enough torque to mill at conservative speeds.
> > > > > >
> > > > > >Sorry post is so long...I like to be as detailed as I can.
> > > > > >
> > > > > >Thanks!!!
> > > > > >-Brady
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >Addresses:
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to

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> > > > be a sister site to the CCED group, as many of the same

members

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