Re: [CAD_CAM_EDM_DRO] Clarification for microstepping requirement

another analogy: think of a diesel engine vs a rotary.
microstepping makes that bang! bang! bang! full
stepping into a smoothly powered transition.
one fellow, pleased with his new microstepping system,
declared:
the steppers now run almost as smooth as servos!

--- Richard Garnish <rdg@...> wrote:

> The biggest benefit of microstepping in my view is
> that is greatly
> reduces the resonances caused by steppers in
> full-step mode. This
> resonance is sometimes enough to lose useful torque
> at certain step
> frequencies, in addition to the other undesirable
> effects of vibration
> on the machine it is attached to. Microstepping
> shouldn't be relied on
> for greater accuracy, but it it worth it for
> reducing resonance and
> getting more even torque response from the motor.
>
> Richard
>
> On Mon, 2005-12-12 at 21:20, ERIC QUARNSTROM wrote:
> > Hey all:
> >
> > I read the great FAQ's on this site regarding
> steppers and how they work and
> > microstepping. Very inciteful and I think I even
> understand how they do it.
> > What I can't quite figure out is why it is
> required. In one of the FAQ's it
> > says the primary purpose for microstepping is to
> eliminate the jerkyness
> > between steps. However, when I do the math on my
> proposed set up I come up
> > with a movement of the axis per step that is so
> small I can't consider it to
> > be 'jerky'. Therefore I am afraid I either didn't
> understand what I read
> > well enough or I'm missing something. My math is
> below and I welcome
> > comments.
> >
> > System statistics:
> > Lead screw with 10 TPI
> > 1:2 gearing between motor and lead screw
> > motor with 200 steps/revolution
> >
> > My math:
> > Every turn of the lead screw gear produces .1
> inches of travel.
> > Every turn of the motor gear produces .05 inches
> of travel
> > Motor has 200 steps per turn of the motor so every
> one step would produce
> > .05/200 inches of travel
> >
> > In summary .00025 inches of travel per full step
> seems like a very small
> > amount of movement. So why would I need to divide
> that by 10 for a
> > microstepping drive?
> >
> > Thanks in advance,
> > Eric Q.
> >
> >
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES:
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
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> 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
>
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> wanliker@..., timg@...
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> 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
>
>
> CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>
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>
>
>

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