RE: [CAD_CAM_EDM_DRO] operating temp of stepper motors

Jan,

In this case your advice for stepper temperature is 100% wrong. Every
motor I have ever seen with a rating on it (an these are civilian, not
military) are rated in the 185 - 195 deg F range. If you are running the
motor at only warm to the touch than you have far more motor than the
application requires as you are severly under driving it. Yes, many of
us opt for that choice, but technically it is very far below the ratings
of the motor.

Tim
[Denver CO]
Sherline Products at Deep Discount
Mach1 & DeskCNC with Credit Card ordering
Contact me for discounts on DeskCNC & Sherline bundles
www.KTMarketing.com/Sherline

> -----Original Message-----
> That is above the "design limit" for "Class A" insulation, which most
> non-military steppers are, I think. They will probably have
> relatively short
> lifespan at 150°F. When you say "parallel", do you mean
> these are 8-wire
> motors, and you have them connected as bipolar? And the
> current PER winding
> (each of two per motor) is 4+ amp? That is quite high for
> "continuous" for a
> Size-23!
>
> Are they RUNNING most of the time, or at stand-still much of
> the time? If
> the latter, ONE thing that can be of amazing help is the
> Gecko drives, as
> they "drop back" to 1/3 current at stand-still, after, what,
> two seconds?
> This keeps MY Size-34 motors just-warm!
>
> General "rule of thumb" is, "If you can't hold your hand
> tightly on the motor
> for more than ten seconds without quite unpleasant
> discomfort, or the paint
> melting into the folds of your finger-prints, it is too hot!"
>
> Jan Rowland, old Troll
>
>
> [Non-text portions of this message have been removed]
>
>
> 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@... [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



Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/