ON 20101011@10:13:33 AM at page:
On a web page you were interested in at:
http://www.piclist.com/io/stepper/linistep/index.htm#40430.3378240741
James Newton[JMN-EFP-786] Published and replied to post 40430.3378240741 by paulius.trulis

|Insert 'Relays would typically be used to control a spindle motor. As most spindle motors run at 110 volts, the kit will not be offered in order to limit liability.' at: '<!-- 40430.3378240741 EOR -->'

<A TITLE="P-78.56.154.165" NAME="40430.3378240741" HREF="mailto:paulius.trulis@gmail.com">paulius.trulis@gmail.com</A> asks: &quot;<A NAME="78.56.154.165">
</A> 
Hello. When Relay driver and PCB mount relay kit will be available? And what it is doing? Can I run without that relay?&quot;

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ON 20101011@10:13:56 AM at page:
On a web page you were interested in at:
http://www.piclist.com/io/stepper/linistep/lini_wks.htm#40443.6913425926
James Newton[JMN-EFP-786] removed post 40443.6913425926

|Delete '<A TITLE="P-198.135.207.175" NAME="40443.6913425926">
</A> 
This is most cool, Im afraid my brain is about to explode with excitement.<!-- 40443.6913425926 EOR -->

   <LI>'



ON 20101012@3:34:00 PM at page:
On a web page you were interested in at:
http://www.piclist.com/io/stepper/linistep/index.htm#40456.4435648148
James Newton[JMN-EFP-786] published post 40456.4435648148

<A TITLE="P-128.210.68.85" NAME="40456.4435648148" HREF="mailto:sergei@purdue.edu">sergei@purdue.edu</A> <BLOCKQUOTE><A NAME="128.210.68.85">
</A> 
I am using Linistepper with a simple IBC-400 RS232 controller (AMS2000.com) and it works great. The motor is in a Klinger 0.1 micron precision translation stage and it takes 0.125 A per winding at about 20 V in DC, I use 60V power supply to have a decent boost in torque and 8 Ohm resistors as R1 and R2.<BR>
The only suggestion (but very critical!!!) - one may need to add 2 diodes to the collectors of each of the 4 output transistors (Q1-Q4) to eliminate very strong positive and negative voltage spikes that occur when the transistors switch coils off and on. In my case with these diodes the maximum motor speed increased several times. Technically I used 2 DF04M diode bridges with the pairs of &quot;~&quot; terminals soldered in the back of the card to pins A1&amp;A2 (one bridge) and B1&amp;B2 (second bridge). The two &quot;~&quot; pin separation in DF04M is exactly the same as the distance between A1-A2 and B1-B2 pins on the board, so it is very easy. The &quot;-&quot; terminals of each bridge go to ground (using extra wire) and &quot;+&quot; goes to M+ terminal. I don't not know if that is critical for any stepper motor, but I found it essential to use limiting diodes for all kinds of steppers I used in past and I believe that is a standard practice with stepper motors.</BLOCKQUOTE>

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ON 20101013@2:17:47 PM at page:
On a web page you were interested in at:
http://pet310.massmind.org/io/stepper/linistep/index.htm#40456.4435648148
James Newton[JMN-EFP-786] published post 40456.4435648148

<A TITLE="P-128.210.68.85" NAME="40456.4435648148" HREF="mailto:sergei@purdue.edu">sergei@purdue.edu</A> <BLOCKQUOTE><A NAME="128.210.68.85">
</A> 
I am using Linistepper with a simple IBC-400 RS232 controller (AMS2000.com) and it works great. The motor is in a Klinger 0.1 micron precision translation stage and it takes 0.125 A per winding at about 20 V in DC, I use 60V power supply to have a decent boost in torque and 8 Ohm resistors as R1 and R2.<BR>
The only suggestion (but very critical!!!) - one may need to add 2 diodes to the collectors of each of the 4 output transistors (Q1-Q4) to eliminate very strong positive and negative voltage spikes that occur when the transistors switch coils off and on. In my case with these diodes the maximum motor speed increased several times. Technically I used 2 DF04M diode bridges with the pairs of &quot;~&quot; terminals soldered in the back of the card to pins A1&amp;A2 (one bridge) and B1&amp;B2 (second bridge). The two &quot;~&quot; pin separation in DF04M is exactly the same as the distance between A1-A2 and B1-B2 pins on the board, so it is very easy. The &quot;-&quot; terminals of each bridge go to ground (using extra wire) and &quot;+&quot; goes to M+ terminal. I don't not know if that is critical for any stepper motor, but I found it essential to use limiting diodes for all kinds of steppers I used in past and I believe that is a standard practice with stepper motors.</BLOCKQUOTE>

|Delete 'P-' before: '<!-- 40456.4435648148 EOR -->' but after: '<A TITLE="'.



ON 20101018@8:50:47 AM at page:
On a web page you were interested in at:
http://www.piclist.org/io/stepper/linistep/index.htm#40466.7900925926
James Newton[JMN-EFP-786] Published and replied to post 40466.7900925926 by jabpop1

|Insert 'Passing on Romans reply:<blockquote>

My suggestion would be to keep the Linistepper inside the house in it's box with heatsink/fan etc, clean and dry, and just run the 5 wires out to the stepper motor so the stepper motor is the only part needed externally on the telescope. The wires can be 50 feet for that with no problems that I can see.

The RJ45 cable itself should be fine for 50 feet or more, however you should not use the tiny RJ style connectors, as these are not suitable for motor current. I would use connectors suitable for 5 amps or more, to ensure good reliability. If in doubt you could solder the wiring direct to the stepper wires and heatshrink for weatherproofing, then just screw those 5 wires into the Linistepper terminal block.

A photo of your finished setup would be much appreciated, and James may add to the Linistepper open-source web page as telescope use is one of the areas the Lini can really shine!
(Is that a pun?)

-Roman</blockquote>' at: '<!-- 40466.7900925926 EOR -->'

<A TITLE="P-68.200.11.37" NAME="40466.7900925926" HREF="mailto:jabpop1@aol.com">jabpop1@aol.com</A> <BLOCKQUOTE><A NAME="68.200.11.37">
</A> 
I need to know how long the connection from the computer to the motor can be.  I plan to use the linistepper for telescope control from inside the house and need to know which cables need to be short and which can be long - in this case about 50 feet.<BR>
   Please respond.<BR>
   jabpop1@aol.com</BLOCKQUOTE>

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