RE: [CAD_CAM_EDM_DRO] Re: Axis Stall Problems

I understand what you are saying, but the measured current
does indeed average around 1 Amp.

Fair 'nuff, At what speed?


I've looked at the A2977 and there are three problems (for me):

1) 35V is on the hairy edge for 24VAC transformer.
Finding a smaller transformer is a pain.
Agreed, I'm running at about 30VAC, I'll report back when it's been making
swarf for a few months.

2) I can not find any Allegro spec. sheet that
explains how to heat sink their product. At
least with the L297, I can just buy a heat sink
that clips right on.

I clamped a CPU heatsink onto the top of the chip with 4 x 3mm bolts. Works
well.

3) Surface mount. I do not really have adequate
equipment to mount the chips.

Nah PLCC is easy, I hand solder SSOP :-)))

All good points though
Best of luck...



I'm sure they are all workable, but in the end, all I
really want is something that is easy to build and just
works. Obviously, the L298/L298 pairs meet that criteria,
but I was hoping I could get a little cheaper and a little
more flexiblilty.

-Wayne

[snippage]







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