Re: Bridgeport retrofit servo questions

Luke,
I found a few motors from www.surpluscenter.com that will most likely
work. Look in my previous posts (same as this one) for the list of
potential motors for the conversion.

Right now I think that I am pretty set on the 10-1906 model for
$80/ea. It has a 5/8" shaft on it that will bolt right up to the
stock pulleys (pretty sure, have to check shaft length) and it has a
long enough rear shaft to mount a number of encoders. Looks like one
of the US Digital ones will work nicely. The Ametek motors listed on
there didn't look like they had enough cookies to move
Bridget...maybe on my CNC router or plasma machine, which now runs
Vexta NEMA 34s. That conversion is next year...

Servo drives will be either Rutex RH90s or Gecko 340s. Jury's still
out on that one.

Power supply most likely will come from Transformer Technology, as
per the recommendations from a few satisfied people. I am not brave
enough or tolerant enough to make my own from the BP monster
transformers etc...unless someone had a step by step guide...Still ~
newer components are almost always better in every way than older
ones. I'm going with a new PS.

I got the BP knowing that I would have to retrofit it sooner or
later...sooner came sooner than I thought :) The ERS board is most
likely smoked in it and I spent a day trying to get the
infamous 'BOSS 5>' prompt...time to move on. I use my other machines
for the business...and hopefully this one too after I get the drive
system nailed down and work my way through Mach2 etc. So the drive to
convert it right now is more to 'wrap it up & get it working' than
anything else...no projects are waiting on it's completion...yet. I
too want to throw some 3D toolpaths at it, so upgrading is the only
way to accomplish this. I often turn down work like milling AL and
steel because I am not really setup for it at the moment...this is
where the BP comes in. I will just add it to my machining
capabilities.

I'll keep you posted as things develop...going to most likely order a
PS and the motors this week. After I mike the shafts and check out
mounting options with the motor etc, I will get the encoders, drives
and quality shielded cable.

-Brady



--- 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
> >
> >
> >
> >
> >
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