Re: [Spam] RE: [CAD_CAM_EDM_DRO] Variable Transformer...my 2 cents worth....

Why yes it does! The designer of the power supply/controller said that a transformer would of be less costly, but this allowed him to adjust the dc voltage for the maxinum voltage for the drivers.... all I can say for the last 9 plus years it's been working very well.... the manufacture name of the small cnc milling machine is Crafter & Son..... There located in Montaina and I believe there still in business and have a web site.....

Russ

Alan Marconett <KM6VV@...> wrote:
Hi Russ,

What did the VARIAC control? Probably not the DC supply to stepper motors
interfaced to a PC. Maybe just the spindle?

VARIAC are not all bad, but they must be used (designed in) with care. In
the hands of the uninitiated, and with less then "commercial"
circuits/wiring, or in the hands of hobbyists, they can be dangerous!

We don't want to loose any members! So we make warnings that may sound
overly harsh. Sometimes 'ya gotta get their attention first! (my old shop
teacher).

Alan KM6VV

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Russ Waters
> Sent: Thursday, July 14, 2005 7:00 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Variable Transformer...my 2 cents worth....
>
> Hi all.... kind of getting in the middle of this so please cope if I am
> out of line.....
>
> So your saying that variac should only be use to adjust the ac line
> voltage? That it shouldn't be used instead of a transformer? As far
> as saftey, what about using a line fuse and the knowlege of good wiring
> practices?
>
> The only reason I bring this up, is because I had my table top cnc for
> over 9 years, and it was commerial built, and uses a variac.....
>
> Russ
>
> Alan Marconett wrote:
> HI Andy,
>
> No, I didn't mean to imply anything about anybody. And I'm perfectly fine
> with questions and answers! I'd have given a more elaborate answer, but
> was
> short on time. I was a bit hasty in my original "NO". I don't wish to
> offend anyone! Neither do I want to see someone hurt.
>
> We did get some good explanations, better then I could have come up with!
>
> Hopefully this thread will come up the next time someone searches for
> "VARIAC".
>
> Alan KM6VV
>
>
> > -----Original Message-----
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Andy Wander
> > Sent: Wednesday, June 29, 2005 9:28 AM
> > To: 'CAD_CAM_EDM_DRO@yahoogroups.com'
> > Subject: RE: [CAD_CAM_EDM_DRO] Variable Transformer
> >
> > Alan:
> >
> > I hope you don't mean to imply that because I wish to ask questions, and
> > discuss it, that I am NOT concerned with safety?
> >
> > There are many different kinds of people-some will take a "NO!" as
> gospel,
> > others want to know why. If you won't tell them why, they may just try
> it
> > anyway-if it IS dangerous, they may get hurt.
> >
> > Dissuade all you want(or think you should) but when somebody asks a
> > question, just restating "Because it's dangerous" is not very helpful,
> in
> > my
> > opinion.
> >
> > Andy Wander
> > Verrex Corporation
> >
> > -----Original Message-----
> > From: Alan Marconett [mailto:KM6VV@...]
> > Sent: Wednesday, June 29, 2005 12:10 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: RE: [CAD_CAM_EDM_DRO] Variable Transformer
> >
> > Hi Dave, list,
> >
> > Yes, that's quite true! And we are all greatly concerned about SAFETY,
> > thus
> > the rather curt "NO" in many (including mine) responses. And yes, we've
> > seen this question many times before, and yes, we will continue to
> > dissuade
> > members from using VARIACs without isolation transformers.
> >
> > VARIACs are a good way to adjust line voltage. I've done it myself for
> > testing a Vextra cw/ccw driver that wanted 100V. Long term solution is
> to
> > use a bucking transformer in series with the primary.
> >
> > Alan KM6VV
> >
> >
> >
> > Addresses:
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> Addresses:
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> [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
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>
> Yahoo! Groups Links
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> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
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> 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
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> Yahoo! Groups Links
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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
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