RE: [CAD_CAM_EDM_DRO] Re: Is it possible to change the BP motor to eliminate shifting?

If the only objection is the requirement to have the spindle running when a
speed change takes place, the speed control stepper/servo could be
controlled by an auxiliary contact on the spindle motor starter. You would
have to have the setup "enabled" when speed change was taking place. The
back-gear speeds would still be manually accessed, but I would put a
microswitch behind the selector handle to reverse the motor direction back
to original CW/CCW by having a relay switch two of the spindle phase legs.

Jeff




-----Original Message-----
From: Stephen Wille Padnos [mailto:spadnos@...]
Sent: Sunday, April 10, 2005 12:37 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: Is it possible to change the BP motor to
eliminate shifting?


Jeff Goldberg wrote:

>Maybe this is heresy, but how about a small stepper or servo motor
>controlling the Varispeed crank. It's kinda hokey, but no fancy spindle
>electronics involved and you get maximum torque at the low end. Also, you
>don't have to change a whole lot of your setup to get there.
>
>Just a thought,
>jeff
>
>

I had thought about this as well. There are issues with the controller
though - you have to be sure that the crank is only turned when the
spindle is running, for instance.

Another option is to use a DC motor and drive, like this guy did:
http://truetex.com/dcdrv.htm

You get full torque at all speeds, so that's not a problem. You don;t
get "extra" torque on the low end though, so it may still me a good idea
to have changeable gearing.

I'm definitely curious about answers to this question as well.
- Steve



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