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Messages - Tweakie.CNC

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5571
Mach SDK plugin questions and answers. / Re: Impact engraving plugin
« on: December 02, 2011, 08:01:07 AM »
Over the past 3 months I have received a number of emails about Impact Engraving and how it has been made to work with Mach3. I certainly had many difficulties to start with so thought I should try to explain the principal for the benefit of others that follow.

The credit must all to go to Andrea for discovering ? that an electro-magnet can be driven directly from one phase of a bipolar stepper motor driver and the, perhaps obscure, principal that advantage can be taken from the fact that electromagnets, just like stepper motors will stall when pulsed too fast.

In operation and when at rest, a stepper motor shaft is locked but when that same stepper motor is pulsed too fast it will stall and then the shaft is free to rotate, in either direction, quite easily by hand – the energy within the coils is not transmitted to the iron core of the rotor or at least if it is transmitted then it is in complete balance and cancels itself out.
It is the same with an electromagnet – in operation and when at rest, it is energised but when it is pulsed too fast it will effectively ‘stall’ and drop out. As the pulse rate is reduced, a threshold is reached and at that point the electromagnet will again be energised and this is the way in which the impact engraver can be used.
The actual needle impacts with the work are made only on the ‘overshoot’ of the return or spring stroke and the Z height has to be precisely adjusted to take advantage of this. Setting up is perhaps easier the second time around but once mastered is extremely easy to reproduce.

There is still some work to be done here and I am perhaps lagging behind on updating the pdf document (Engraving.pdf   http://www.cooperman.talktalk.net/Engraving.pdf) which so far attempts to cover Laser but not yet Impact – it is on my ‘to do’ list and will be completed as and when.

In the meantime if anyone else has any experiences with Impact Engraving I would be extremely please to hear them.

Tweakie.

5572
General Mach Discussion / Re: Delta VFD control from Mach
« on: December 02, 2011, 02:49:47 AM »
Good news Don - progress  :D

Tweakie.

5573
General Mach Discussion / Re: Delta VFD control from Mach
« on: December 01, 2011, 11:08:33 AM »
Hi Don,

You need to check with your VFD instructions but selecting US Mode on the C41,  I would connect both V-IN together and connect these to VFD terminal SD   then relay #1 terminal NO to VFD terminal STF   and relay #2 terminal NO to VFD terminal STR.

Tweakie.

5574
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: December 01, 2011, 07:58:38 AM »
I've now lost all respect for you, my friend -  ;)

Dave

Hi Dave,

I have been having sleepless nights about this - Could I possibly redeem my position if I sent you some free samples of the 'infinite trolley token' and the 'car park entry card' ??

Tweakie.

5575
General Mach Discussion / Re: Steppers are too slow
« on: December 01, 2011, 05:15:46 AM »
Hi Stuart,

Can I suggest you carry out a couple of very basic tests.

Initially just one controller set microsteps (SW 5-8) at 1600 steps per rev and the motor current (SW1-3) at 3 Amps.

Go into Mach, Motor tuning and set "steps per" to suit your machine screw pitch (theoretical) then adjust motor velocity.

What speed does the motor stall at ??

Connect a voltmeter to your power supply output.

Does it maintain the 24 Volts during the above test ??

Tweakie.

5576
Tangent Corner / Re: Theroretical CNC Mill Design
« on: December 01, 2011, 03:15:47 AM »
Is there a point to all this ??

Tweakie.

5577
General Mach Discussion / Re: Steppers are too slow
« on: November 30, 2011, 08:28:59 AM »
Ian,

Even if his system is not that well matched don't you think he should still be able to achieve better than 50 rpm ??

Tweakie.

5578
Tangent Corner / An Optical Illusion.
« on: November 30, 2011, 07:56:45 AM »
Obviously the camera shutter plays an essential part in creating the illusion here but I found it interesting nonetheless.

http://www.youtube.com/user/TheManimation

Tweakie.

5579
General Mach Discussion / Re: Steppers are too slow
« on: November 30, 2011, 07:33:00 AM »
Hi Stuart,

The fact that you cannot use P2,P3 is an indication that something is wrong there.
One difficulty that has cropped up a few times recently is that most newer PC parallel ports have changed from the 5 volt TTL standard to the 3.3 volt TTL standard and some breakout boards will still only reliably work with the 5 volt signals.

Tweakie.

5580
General Mach Discussion / Re: Steppers are too slow
« on: November 30, 2011, 05:08:58 AM »
Stuart,

I take it you have set up each of your steppers for optimum Velocity (reduced by some 20% - 30% for reliability) and Acceleration ??

Tweakie.

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