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xairflyer
11-08-2003, 07:35 AM
Hi Guys

New to this excellent forum, Just prurchase the MDF and will be starting cutting it up today.

On the motor end Biplor and unipolar what is best.
I have the chance of getting a:

VEXTA STEPPER MOTOR PART No PK266-02B DC 2A 1.8 OHM . 2 PHASE STEPPER MOTOR. DOUBLE SHAFT TYPE. 56.4MM SQUARE. 1/4" SHAFT.

It is new and is cheap, is two phase bipolar ?

On Cranky's web site hes says to look out for brands like Vexta so I thought this would be suitable.

Do all the three motors have to be identical ? I know they all would have to be either biplor or unipolar but thats all.

Thanks guys

balsaman
11-08-2003, 11:03 AM
Unipolar motors can be used on a bipolar drive, but bipolar motors can't be used on a unipolar drive.

If you are going to use a bipolar drive, either will do, if you go unipolar drive, you need unipolar motors.

You can use 3 different motors, but 3 identical motors makes a neater install...It's what ever makes you happy.

Eric

xairflyer
11-08-2003, 11:09 AM
Thanks for the reply

Is the motor above suitable for something like your first machine ?

Also I have seen 3 of the following for sale.

NEMA 42, 2 Stack, Sanyo Denki H Series High Performance, rare earth magnet, stepper motor
Sanyo Part No: 103H89222-5421
200 full steps per rev (1.8 degrees per full step); 2.5 Volts, 6 Amps per phase; Holding torque 120 kg.cm (11.8 Nm, 1670 oz.in); Body diameter 106.4mm (4.2 ins); Body length 163.3mm (6.43 ins); 4 lead bipolar motor - can ONLY be used with bipolar stepper drivers.


I think these won't be as cheap though, but are they any good for the purpose.

I don't know anything about steppers - YET !

xairflyer
11-10-2003, 12:46 PM
OK seems the Nema at 6A is too much 1 - 2A for a small machine seems about right.

Learning all the time

Thanks Balsaman for your PM

balsaman
11-10-2003, 04:00 PM
:)

xairflyer
11-12-2003, 04:46 PM
I have been offered two brand new Vexta PK266-02B steppers rated at 2A 127 ozins which seems very good the spec says 3.6v
but when I look at the product page on the Oriental motor company site it shows 24v and 36v on the graph.

I am a bit confussed.

Oriental link

http://www.orientalmotor.co.jp/cgi-bin/WebObjects/UPOMStep.woa/wa/F3?typeNameId=1&modelName=PK266%2D02B&seriesId=2PK&frameSize=56.4

Anybody have the web site of Nema type motors

ger21
11-12-2003, 07:30 PM
Those are the voltages the motors are being run at to get the results shown in the graph.

Gerry