ON 20100519@4:28:59 PM at page:
On a web page you were interested in at:
http://www.piclist.com/io/stepper/linistep/lini_tun.htm#40315.3279976852
James Newton[JMN-EFP-786] Published and replied to post 40315.3279976852 by cbowels

|Insert 'Your symptoms are really unusual. We would expect the top speed to change with the mode. After thinking long and hard about it, our best guess is mechanical resonance in the motor. Try clamping the motor strongly to a very solid surface and add some sort of load to the motor shaft. If that changes the top speed at all, it's probably just resonance and can be controlled by any number of vibration / resonance damping systems.' at: '<!-- 40315.3279976852 EOR -->'

<A TITLE="P-123.243.217.132" NAME="40315.3279976852" HREF="mailto:cbowels@tpg.com.au">cbowels@tpg.com.au</A> asks: <BLOCKQUOTE><A NAME="123.243.217.132">
</A> 
Does anyone have ideas on how to make a stepper go faster before stalling?<BR>
<BR>
At the moment the fastest I can get my stepper to turn is about 2.5rev/sec before it just sits on the bench and hums. I have a stepper motor with part number FL60STH86-2008BF (6V, 2A) and I&#226;&#8364;&#8482;m using the two 1ohm resistors supplied with the LiniStepper. I have tried both 12V and 24V power supplies. It doesn&#226;&#8364;&#8482;t seem to matter what step mode I&#226;&#8364;&#8482;m using (3600, 1200, etc) the maximum speed tops out at about 2.5rev/sec. I have a decent fan-cooled heat sink so cooling is not an issue.<BR>
<BR>
Any advice would be appreciated.<BR>
Thanks</BLOCKQUOTE>

|Delete 'P-' before: '<!-- 40315.3279976852 EOR -->' but after: '<A TITLE="'.



ON 20100519@4:31:16 PM at page:
On a web page you were interested in at:
http://www.piclist.com/io/stepper/linistep/lini_tun.htm#40315.3279976852
James Newton[JMN-EFP-786] Replied to post 40315.3279976852 by cbowels

|Insert 'I forgot to mention, as supplied the 1 ohm sense resistors cause the Linistepper to put out 1 amp per phase. You can change that to 2 amps (a better match for your motor) by adding a second 1 ohm resistor in parallel with each existing sense resistor mounted on the opposite side of the PCB.' at: '<!-- 40315.3279976852 EOR -->'

<A TITLE="123.243.217.132" NAME="40315.3279976852" HREF="mailto:cbowels@tpg.com.au">cbowels@tpg.com.au</A> asks: <BLOCKQUOTE><A NAME="123.243.217.132">
</A> 
Does anyone have ideas on how to make a stepper go faster before stalling?<BR>
<BR>
At the moment the fastest I can get my stepper to turn is about 2.5rev/sec before it just sits on the bench and hums. I have a stepper motor with part number FL60STH86-2008BF (6V, 2A) and I&#226;&#8364;&#8482;m using the two 1ohm resistors supplied with the LiniStepper. I have tried both 12V and 24V power supplies. It doesn&#226;&#8364;&#8482;t seem to matter what step mode I&#226;&#8364;&#8482;m using (3600, 1200, etc) the maximum speed tops out at about 2.5rev/sec. I have a decent fan-cooled heat sink so cooling is not an issue.<BR>
<BR>
Any advice would be appreciated.<BR>
Thanks</BLOCKQUOTE>
<!-- REPLY --> <A TITLE="JMN-EFP-786" NAME="40317.6867939815" HREF="/techref/member/JMN-EFP-786/index.htm">James Newton of Massmind</A> replies: <I>Your symptoms are really unusual. We would expect the top speed to change with the mode. After thinking long and hard about it, our best guess is mechanical resonance in the motor. Try clamping the motor strongly to a very solid surface and add some sort of load to the motor shaft. If that changes the top speed at all, it's probably just resonance and can be controlled by any number of vibration / resonance damping systems.</I><!-- 40317.6867939815 EOR --><P>



ON 20100524@12:00:56 PM at page:
On a web page you were interested in at:
http://www.piclist.com/io/stepper/linistep/index.htm#40321.1168981481
James Newton[JMN-EFP-786] Published and replied to post 40321.1168981481 by jamwaffles

|Insert 'As long as the components are rated for double that voltage and you provide enough heat sink, it will run just fine. A 5 volt stepper, however, shouldn't need more than 7 to 9 volts at the most. Speed problems are usually related to resonance (try microstepping modes, solid mounting, and a damper) or the wrong current sense resistors installed for the motor.' at: '<!-- 40321.1168981481 EOR -->'

<A TITLE="P-213.106.83.50" NAME="40321.1168981481" HREF="mailto:jamwaffles@googlemail.com">jamwaffles@googlemail.com</A> asks: <BLOCKQUOTE><A NAME="213.106.83.50">
</A> 
Hi,<BR>
<BR>
I have already built one linistepper of my own design and will be building a couple more for my CNC machine, but I have a question... will the linistepper run on 36v reliably? Also, I think I might have built it wrong because my 5V steppers at 19V still wont run very fast. Anyway, the most important question is will the linis run at 36v?<BR>
<BR>
Thanks,<BR>
<BR>
James</BLOCKQUOTE>

|Delete 'P-' before: '<!-- 40321.1168981481 EOR -->' but after: '<A TITLE="'.



ON 20100531@9:35:53 AM at page:
On a web page you were interested in at:
http://www.piclist.com/techref/io/stepper/linistep/index.htm#40329.3997453704
James  Waples[JW-googlemail-] Questions:

I'm having a strange issue here which I think is the crappy PC I'm on but I'd just like some clarification from a pro. I can run the linistepper where the motor is on 19V of laptop PSU and the PIC and stuff is on USB from the PC. The motor makes a noise but the shaft does NOT turn but at higher speeds the shaft DOES turn but the motor sounds very dirty like there are stray steps everywhere. What might the problem be for this? Would it maybe be the USB supply at less than 5V (4.7 or whatever it is) or something different?<BR>
<BR>
Thanks,<BR>
<BR>
James