Re: [CAD_CAM_EDM_DRO] 3 Phase/VFD question

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
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>> 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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>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.
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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 DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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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!!!!!!

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