Re: [CAD_CAM_EDM_DRO] 3 Phase/VFD question

On Wed Jun 2 21:55:08 2004 R Petersen wrote:

>Thank you for the help, one thing I forgot to mention
>is that the mill has adjustable variable speed pullies
>using a stepper motor. So will making an adapter for a
>1 phase 230v motor?
>Ron

Well, you can use both style systems there. The 1 phase motor and pulleys
alone would give you a number of usable speeds, and a variable speed controller
and 3 phase motor would give continuously adjustable speed across the range.
putting a 3 phase motor and controller together with a pulley setup, would give
you the whole range, while the pulleys would make torque ranges available. I'm
thinking a small to middling size machine here. For that to be really useful,
you'd need something with enough beef to soak up vibration, and be sturdy enough
as well. Building a machine mainly depends upon what you want to do with it,
and how.

Bill

>--- Bill Vance <ccq@...> wrote:
>> Howdy Ron;
>>
>> On Wed Jun 2 06:34:54 2004 R Petersen wrote:
>>
>> >I have a SHIZUOKA NC mill (converting it to CNC)
>> and
>> >don't know what the motor rating is. The nameplate
>> is
>> >on there. I'll have to recheck. Question is I'd
>> like
>> >to get 1 VFD for 2 different machines, is that
>> >possible?
>>
>> Yesm bearing in mind that the wiring diagrams in
>> some manuals, allready looks
>> like an explosion in a spaghetti factory. :-)
>>
>> > How do I properly size the VFD for the Mill?
>>
>> Figure out what speed and horsepower you need, what
>> gear/pulley reduction you
>> may want, and then start looking at motor/VFD specs.
>> look at the previous specs
>> again, with a view towards what tradeoffs you might
>> want to make. Look at them
>> that way several times, until you get something that
>> looks good, and then start
>> looking at cooling and lubrication factors. Will
>> your bearings stand the heat,
>> torque. speed factors, and so on.
>>
>> >Where in the Rutland catalog can I find this and
>> what
>> >else is the VFD called?
>>
>> The motors are on page 480. Drives for short.
>>
>> >Would it be better to make a motor mounting plate
>> and
>> >install a 230 1 phase motor?
>>
>> No. Unless you want something that works at one and
>> only one speed.
>>
>> Bill
>>
>>
>> >Thank You,
>> >Ron Petersen
>> >
>> >
>> >--- Bill Vance <ccq@...> wrote:
>> >> Hi Jan;
>> >>
>> >> Not sure what I did with that catalog at the
>> moment,
>> >> but I do have another.
>> >> According to the Airgas/Rutland Tool catalog,
>> there
>> >> are several models, and
>> >> the RPMs listed at 60 Hz input are, 1710, 1725,
>> >> 1740, and 1750. and are rated
>> >> at 1 to 3 horsepower.
>>
>> >>
>> >>
>>
>> >>
>> >> I'm looking at the two one horse models, and the
>> >> first is a TEFC-NEMA 56,
>> >> weighing in at 31 lbs., and the other is a
>> TEFC-IEC
>> >> B3 foot mount D80, weighing
>> >> about 13 lbs. Those are shipping weights. They
>> are
>> >> rated at 1725, and 1710
>> >> RPMs, respectively. Sounds like the second one
>> >> might be better for the Z axis
>> >> spindle on a vertical mill, whereas either should
>> >> workfor a lathe spindle, yes?
>> >>
>> >> Bill
>> >>
>> >>
>> >> On Tue Jun 1 16:31:17 2004 JanRwl@... wrote:
>> >>
>> >> >In a message dated 6/1/2004 1:31:00 PM Central
>> >> Standard Time,
>> >> >ccq@... writes:
>> >> >motor that was rated, if I remember correctly,
>> at
>> >> 1792 RPM. A VFD I've
>> >> >looked at has a frequency rating of .5 to 360
>> Hz.
>> >> If combined, what would be the
>> >> >output range of RPMs
>> >> >from the motor? Do I divide 1792 by 60, and
>> then
>> >> multiply that by 360, or
>> >> >what?
>> >> >
>> >> >Bill: I may be wrong, but I THINK this strange
>> >> number, 1792, is the result
>> >> >of taking the 1800 RPM "sync. speed" and
>> deducting
>> >> some (theoretical quantity?)
>> >> >value "speed derating". You absolutely sure you
>> >> have the number exactly
>> >> >correct? Because 1782 = 99% of 1800 RPM. If
>> you
>> >> run a standard "1750 RPM" motor
>> >> >on 60 Hz. with no load, or VERY little load, it
>> >> will run at exactly 1800 RPM.
>> >> >Same for a "3450 RPM" motor: 3600 RPM. ANYway,
>> >> you would get the correct
>> >> >result with your algorithm, but the CORRECT
>> >> proceedure would be to divide the
>> >> >VFD's output-f by 60 (or 50, if in almost
>> anywhere
>> >> in the rest of the world),
>> >> >and then multiply the 1792 or 1750 or 3450 or
>> >> whatever "name-plate RPM" by the
>> >> >result. (I understand that 360 Hz. is generally
>> >> the highest f you can get "in
>> >> >the U.S." (60 Hz. mains), but in Europe with 50
>> Hz,
>> >> you can get up to 400 Hz.
>> >> >Has something to do with the "explosion speed"
>> of
>> >> motors or some-such
>> >> >old-wives' tale spec. I dealt with a rotary
>> >> f-converter I installed in England,
>> >> >once, and I PROMISE, though "all went well, and
>> >> worked, and I was paid", I don't
>> >> >EVER wanna hafta mess with such again! Whew!
>> TOO
>> >> Much iron and copper for ME!
>> >> > Jan Rowland
>> >> >
>> >> >
>> >> >[Non-text portions of this message have been
>> >> removed]
>> >> >
>> >> >
>> >> >
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>>********************************************************************************
>> >> *
>>
>> >> *
>> >> RKBA! * Blessings on thee, oh
>> >> Israel!!! * 4-19!
>> >> *
>>
>> >> *
>> >>
>>
>>********************************************************************************
>> >>
>> >> An _EFFECTIVE_ | Insured by | All Matter is
>> >> vibration. | Let he who hath no
>> >> weapon in every | by Colt; | --Max Planck
>>
>> >> | weapon, sell his
>> >> hand = Freedom | Dial | In the beginning
>> was
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>> >> on every side!! | 1-911-A1 | Word. --The Holy
>> >> Bible | sword. --Jesus Christ
>> >>
>> >>
>>
>>********************************************************************************
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>> >> Constitutional Government is dead! LONG
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>> >> THE CONSTITUTION!!!!!!
>> >>
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>> >>
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>> >>
>> >> 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
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>> >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
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>> --
>>
>********************************************************************************
>> *
>> *
>> RKBA! * Blessings on thee, oh
>> Israel!!! * 4-19!
>> *
>> *
>>
>********************************************************************************
>>
>> An _EFFECTIVE_ | Insured by | All Matter is
>> vibration. | Let he who hath no
>> weapon in every | by Colt; | --Max Planck
>> | weapon, sell his
>> hand = Freedom | Dial | In the beginning was
>> the | garment, and buy a
>> on every side!! | 1-911-A1 | Word. --The Holy
>> Bible | sword. --Jesus Christ
>>
>>
>********************************************************************************
>>
>> Constitutional Government is dead! LONG LIVE
>> THE CONSTITUTION!!!!!!
>>
>>
>********************************************************************************
>>
>>
>> Addresses:
>> FAQ: http://www.ktmarketing.com/faq.html
>> FILES:
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>> URL to this group:
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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
>>
>>
>> Yahoo! Groups Links
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>>
>> CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>>
>>
>>
>
>
>
>
>
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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
>
>
>Yahoo! Groups Links
>
>
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>
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>

--
********************************************************************************
* *
RKBA! * Blessings on thee, oh Israel!!! * 4-19!
* *
********************************************************************************

An _EFFECTIVE_ | Insured by | All Matter is vibration. | Let he who hath no
weapon in every | by Colt; | --Max Planck | weapon, sell his
hand = Freedom | Dial | In the beginning was the | garment, and buy a
on every side!! | 1-911-A1 | Word. --The Holy Bible | sword. --Jesus Christ

********************************************************************************

Constitutional Government is dead! LONG LIVE THE CONSTITUTION!!!!!!

********************************************************************************