RE: [CAD_CAM_EDM_DRO] Re: Dual shaft dc motor supplier

You really need to take some time and read the instruction manuals for some
of the CNC servo controllers. Your presumption of servo controller
simplicity may leave you very frustrated if you try building your own at
this point. You may wish to further research the HOW and WHY of PID
functionality within the servo controllers. This will shed a great deal of
light on just how tricky these designs can get.

Your question of price is understandable but don't let motor prices mislead
or deceive you. Understand that DC motors are NOT the same as true servo
motors. Although, DC motors can provide very good results if the
differences are considered and accounted for. First, stepper and DC/Servo
motors, at least in smaller sizes, can be comparably priced. Smaller sizes
are suitable for most hobby-sized mills. Second, a good 4-axis, bipolar,
microstepping stepper controller costs between $150 and $200. A decent
4-axis servo controller setup can cost $600 to $1500 to start.


Thanks,
Andrey Lipavsky
Essex Jewelers
490 E. McMillan St.
Studio 205
Cincinnati, OH 45206
(513) 826-0240
www.essexjewelers.com


-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of kstropus
Sent: Saturday, August 04, 2007 5:18 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Dual shaft dc motor supplier

My primary interest is in building the controller. Stepper
controllers seem much more complicated compared to servo controllers.
All I have to do with a servo controller (it seems to me) is move it
forward or reverse until I count the steps I need then keep it there.
With steppers I have to deal with micro stepping, resonance, and all
sorts of other junk I don't need to mess with when I have a much more
simpler option.

And I don't really understand why everyone says steppers are cheaper.
I can buy surplus dc motors and encoders dirt cheap and put a servo
together myself. Steppers are so damn expensive, plus everyone and
his brother is running a hobby cnc web site or ebay store selling
steppers, which means they buy up all the surplus stepper supply and
resell them at twice the price. I don't really see many of them
selling servo systems.

However, I have invested a tremendous amount of research in steppers,
so I'm more than happy to listen if anyone thinks I'm off base here
and wants to set me straight.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Andrey Lipavsky"
<alipavsky@...> wrote:

>
> If you're looking for the least expensive way to go, why not use

steppers?

>
> Thanks,
> Andrey Lipavsky
> Essex Jewelers
> 490 E. McMillan St.
> Studio 205
> Cincinnati, OH 45206
> (513) 826-0240
> www.essexjewelers.com

Addresses:
FAQ: http://www.ktmarketing.com/faq.html
FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com

Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
Moderator: pentam@... indigo_red@... davemucha@...
[Moderators]
URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO

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........
bill
List Mom
List Owner


Yahoo! Groups Links