Re: [CAD_CAM_EDM_DRO] Bridgeport retrofit servo questions

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@...

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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