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Author Topic: Impact engraving plugin  (Read 259099 times)

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Offline Tweakie.CNC

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Re: Impact engraving plugin
« Reply #200 on: October 01, 2012, 06:50:09 AM »
As I have not posted any pictures here for a while I just thought you may like to see this one.
It was done using the plugin and laser into some scrap MDF.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Impact engraving plugin
« Reply #201 on: October 05, 2012, 11:01:39 AM »
Hi guys,
they are my first tests of my electomagnetic impact engraving.
I have redesigned the solenoid system for to increment feed of execution.
With my electronic I can switch resolution of steps train and I can make small and big photo
I can adjust the power of impact.
With  low resolution can to go to 3000mm/m .
The system is almost ready.
I forgot to thank the forum for the help.
Some tests on granite and alluminium...

« Last Edit: October 05, 2012, 11:18:06 AM by patter »

Offline Tweakie.CNC

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Re: Impact engraving plugin
« Reply #202 on: October 05, 2012, 12:26:38 PM »
Excellent work Pasquale.

What voltage are you using to drive your magnet ??

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Impact engraving plugin
« Reply #203 on: October 05, 2012, 01:14:40 PM »
Hi, Tweakie,
currently the power supply is 48v, but I need to improve
the current control on the solenoid coil.
So  I can to increase the voltage power supply to 90v for greater
impact speed at more of 3000mm/m.
This is very important problem, otherwise make a medium/big photo can to be too long
Thanks .
« Last Edit: October 05, 2012, 01:17:01 PM by patter »

Offline Dan13

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Re: Impact engraving plugin
« Reply #204 on: October 05, 2012, 02:22:36 PM »
Can you please clarify how the higher voltage helps in increasing the oscillating speed?

Dan
Re: Impact engraving plugin
« Reply #205 on: October 05, 2012, 04:53:28 PM »
Hi Dan...
increasing the voltage, the solenoid can work at frequency of osillation more high,
than the feed rate can to be more.
This happens because a coil opposes the current
with increasing frequency. The only way is to increase
the supply voltage.
But the current that circolate in the coil must be adjusted fine, otherwise can burning.

Offline Dan13

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Re: Impact engraving plugin
« Reply #206 on: October 06, 2012, 02:13:55 AM »
Hi,

I think Tweakie has once mentioned this to me. But I still don't understand this, since as we know the current change rate on a coil is described by:

  i(t) = I0-(R/L)t

So only depends on the inductance...?

Dan


Offline Tweakie.CNC

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Re: Impact engraving plugin
« Reply #207 on: October 06, 2012, 02:14:45 AM »
Hi Pasquale,

I think you are on the right track with the voltage. I am currently using 72Volts but have found that fine control of the pulse timing can also provide an increase in repetition frequency. As long as the voltage is removed just prior to impact the rebound increases the speed of the return stroke.

I am looking forward to hearing more about your developments and progress.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Impact engraving plugin
« Reply #208 on: October 06, 2012, 04:35:01 AM »
Of course.
It's very important to control the damping of coil ,
but isnt only electronic problem ......we have a mechanism.
Bad problem is resonance frequency of mechanism .
The Zobel network can be help, we have all components....
frequency, inductance and moving mass.

@Dan
no..... depends of many factors, including inductance
« Last Edit: October 06, 2012, 04:53:08 AM by patter »
Re: Impact engraving plugin
« Reply #209 on: October 06, 2012, 01:02:34 PM »
This is schematic block diagram of my electronic...