RE: [CAD_CAM_EDM_DRO] Re: supertech

I think it would be nice to start recording what performance people are
seeing
from the various drivers. I am getting reports of 400 to 450mm/min on the
Taig
table using Xylotex drivers at 28V-bipolar while I am getting a good
600mm/min
with the Taig/MicroProto controller running 60V-unipolar. The
Taig/MicroProto
closed loop controller will give 1500mm/min with the same stepper motor
driver. I have yet to get the Chinese drivers hooked up to test them, but I
have had the L297/298 pair running at 24V and giving 300mm/min driving one
pair of the unipolar wired taig motors.

[Paul Kelly] OK, so you define performance as rapid speed. Or, in the
context of a discussion on driver boards, the rate at which the drive can
commute the motor.

This obviously all depends on the 'load', motor, power supply and driving
software,

[Paul Kelly] Actually, the single biggest factor affecting rapid speed is
ballscrew pitch. Apologies to those who've heard this rant before but..
If you double the pitch of your ballscrews, your stepper system with go at
least twice as fast.
After ballscrew pitch, motor inductance would be second. I know someone
people who went shopping for some NEMA23's and said; "Why would I buy a
250oz.in motor when I can get a 450 for only a few $ more!" Said person
also defines performance as rapid speed and refuses to accept that his
machine would go faster on the 250oz.in motor.

but I'm sure we can start to put together some realistic figures for
the various options of driver, and perhaps pull out combinations that simply
don't go, and onces that work well?

[Paul Kelly] I think your idea is good. If nothing else it gives people a
reality check for their machines. You should compile the data and put a
spreadsheet into the files section??

For my part.
9x20 Lathe, NEMA34 300Oz.in 297/298driver 35V 5TPI ballscrew 5m/min

12"x20" Router, NEMA23 250oz.in A3977(same as xylotex) driver, 20mm pitch
ballscrew 15m/min
[Paul Kelly] PK

--
Lester Caine - G8HFL
-----------------------------
Contact - http://home.lsces.co.uk/lsces/wiki/?page=contact
L.S.Caine Electronic Services - http://home.lsces.co.uk
MEDW - http://home.lsces.co.uk/ModelEngineersDigitalWorkshop/
Firebird - http://www.firebirdsql.org/index.php


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