Re: [CAD_CAM_EDM_DRO] Re: Torque when using Micro Step or Full Step

Mariss,
Ok now I understand.... look for a 445 oz-in motor for sale on eBay sometime soon.
The next version of this motor has a holding torque of 975 oz-in for the same drive current.
As the current motor is marginal I'm hoping a 100% increase in rate holding torque will solve the problem.
What do yo think ?
Best Regards
Hans W

"Mariss Freimanis " wrote:

> Hans,
>
> You have missed the point and that is my fault. The moment a full-
> step driven motor takes a step, it moves the motor at a high velocity
> to the next step location (1.8 degrees away). This velocity is wasted
> energy and must be accounted for.
>
> A microstepping drive parcels out the "distance to move" in much
> smaller increments. Energy is mass times velocity squared divide by
> 2. If the distance to move is 1/10 as far, velocity will also be
> 1/10, and the energy invested in momentum will be 1/100 compared to a
> full-step drive.
>
> The step rate doesn't matter if it is 5 steps per second or 1 step
> per hour. The effect is the same.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Hans Wedemeyer <xyz@h...>
> wrote:
> > Mariss,
> > The motor is brand new special made (spindle lengths) and
> guaranteed to be new because of that.
> > The spec. sheet only talks about Holding Torque and it's +- 10% so
> the 445 oz-in motor may already only be a 400 oz-in !
> > If Full step has an advantage at start up ( where my main problem
> is) If I used a control that allowed me to switch Full Step for
> startup and micro step for normal running, that may be a solution.
> > I'll consider that and see what I can come up with.
> > In Series mode this motor require 2.8Amp drive and I may be able to
> throw together a L6203/L297 circuit and do the Full Step/Half Step
> tomorrow.
> >
> > I'll post results.
> > Best regards
> > Hans W
>
> 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/