The Chevalier CNC I used for several years had a manual mode in which
servos were fully disconnected, and no pronies, etc. ALL mills will
occasionally send the table flying if table locks are not employed. The
only time I ever had this happen, it was on a plain screw horizontal
Cincinnati.
At 08:22 PM 10/30/02 -0600, you wrote:
The caveat on using a ballscrew feed in a manual mill is
because the ballscrew provides virtually no friction,
compared to an acme screw feed. You'd want a small prony
brake, or some kind of damper to keep the table from moving
when you took your hand off the crank. Best bet is to
couple the ballscrews to either a servo or stepper (in that
order of preference) as they would effectively hold
position at the end of each move, assuming that they are
controlled by a CNC system.
RayHex
----------
From: C.S. Mo <cs@...>
To bring back a question that has been recently discussed
with Ballscrews
but not Acme rod..
I have roughly .015" backlash in my X and Y travels. I've
heard talk
about "double-nutting" in order to reduce backlash. Has
anyone done this
to one of the little Mill/Drills? Any advice on how to go
about doing it?
I've considered going to ball screws but my
understanding is that ball
screws make it so that the machine can not be used for
manual milling -
is that correct?
Addresses:
FAQ:
FILES:
Post Messages: CAD_CAM_EDM_DRO@...
Subscribe: CAD_CAM_EDM_DRO-subscribe@...
Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@...
List owner: CAD_CAM_EDM_DRO-owner@..., wanliker@...
Moderator: jmelson@... timg@... [Moderator]
URL to this group:
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.
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
Your use of Yahoo! Groups is subject to
Regards, Hoyt McKagen
To prevent virus propogation, don't put this addy in your book
Belfab CNC -
US Best MC -
Camping/Caving -
Two-Wheel-Tech List -
If you torment a serpent, it will cough up a dead rat
