Re: [CAD_CAM_EDM_DRO] Beginners screws ( was ACME ( was Re: leadscrew,

----- Original Message -----
From: turbulatordude <davemucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, May 18, 2003 8:23 PM
Subject: [CAD_CAM_EDM_DRO] Beginners screws ( was ACME ( was Re: leadscrew,


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "alex" <telecomt@t...> wrote:
> > Ross,
> > getting back to the issue of precision.
> > I have 400 steps per rev stepper.
> > Looks like for 2" diameter drive pulley I should have 0.0157" per
> step.
> > Can I increase the resolution by using half-step - microstep option?
> > Does it mean that for half- step I will get 0.00785 resolution, and
> for
> > mocrostepping
> > even less?
> > Regards, Alex
> >
>
>
> I'm not sure of your distance. are you using a lead screw ? sounds
> like one revolution is 400 steps for your 2" OD.
>
> and yes, you will have better resolution if you use a microstep drive.
> but you will have better resolution and more power if you change the
> gearing to a 2:1 or 10:1 ratio.
>
> Dave
>
>
>
>
> > ----- Original Message -----
> > From: Ross <rrcarl@n...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Friday, May 16, 2003 10:47 PM
> > Subject: [CAD_CAM_EDM_DRO] Beginners screws ( was ACME ( was Re:
> leadscrew,
> >
> >
> > > > Just want to report , that I was at Home Depot and carefully
> inspected
> > > > caster wheels.
> > > > They seem to be perfectly round to me!
> > > > Designated them as important component of the future guideway.
> > >
> > >
> > > You should put a dial indicator on them as they rotate. 10 thou
> is not
> > easy to see by eye, but if you do things like vee routing text,
> that error
> > will show up in your finished part. Roller blade wheel bearings
> should be
> > available at a local sporting goods store. If I were looking for
> locally
> > available solution, that's the way I'd go. I think you'll find the
> bearing
> > to be cheaper than casters also.
> > >
> > > I learned all this stuff the hard way. My table started out as a
> simple 2
> > axis plasma cutting table. After I got the table, rails and
> carriages
> > built, I decided to add a Z axis to retract and lower the torch.
> After the
> > Z axis, I realized that I could do some pretty cool 3D carving. It
> was then
> > that I figured out that the angle iron rails did not offer much
> linear
> > consisency. I made a jig to grind the angle rails and got them to
> within
> > .002 which has been working fine for woodworking.
> > >
> > > My point is that your choice of rollers will effect your Z axis
> accuracy.
> > If all ytou want to do flame or plasma cut, then that is not a big
> deal, but
> > if your want to carve photographs and make signs, Z axis precision
> is pretty
> > important. Imagine cutting a photograph .020 deep and for every
> revolution
> > of an X axis roller, the carriage floats up and down .010 because a
> roller
> > is out of round.
> > >
> > > Ross
> > >
> > >
> > > Addresses:
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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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timg@...
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>
> 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/
>
>