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Fórum » Only in English » Mach3 related issues » Local System Rotate and is use when Isolation Routing PCB's
Local System Rotate and is use when Isolation Routing PCB's
tweakie Dátum/Date: Szerda, 2012-11-14, 14:20 | Üzenet/Post # 1
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When Isolation Routing double sided PCB’s I drill two holes in the PCB blank (one is the datum and one the reference) to locate the work on two pins in the spoil board on the machine. This method enables good location of the tracks when machining each side and also for hole drilling etc. (always using the same datum point for X zero / Y zero).

After reading this post, on the Artsoft forum and watching the video http://www.machsupport.com/forum/index.php/topic,22555.0.html I thought I would try visual location of the datum and reference holes (using my cross hair pointer) and use ‘Local System Rotate’ just to see if it was an easier method.

Then using 3 CB buttons (at the bottom of my Mach screen) it is as easy as ABC. Well it’s almost that easy. smile
Obviously this was only experimental so it is bit of a ‘quick & dirty’ solution and it needs work to tidy up the user interface side of things but it works.

Basically…

Button A turns on the cross hair pointer, sets slow jogging and brings up the status message ‘Locate Datum then click Button B’

Button B resets X and Y axis DRO’s to zero and brings up the status message ‘Locate Reference then click Button C’

Button C is where the calculation takes place – the current X and Y axis position (reference) is used to calculate ArcTan of the angle which is then used to set the Local System Rotate. The offset between the cross hair pointer position and the spindle position is factored in and the X and Y axis moved to bring the spindle to the datum position. Jog speed is reset to normal etc. and the status message ‘Complete’ is displayed.

As it turns out this method works very well and in operation is an equivalent to the system used in the aforementioned video. It can handle any rotation or position of the work (within + / - 90 degrees).
Although the accuracy I achieved is acceptable it could definitely be much improved by using a webcam for the hole location and Klaus’s video window (camera plugin). http://www.kd-dietz.com/klausph....on.html

It is not a quicker method than my existing system of using the two dowel pins but it may have advantages with odd shaped circuit boards and possibly alteration of existing boards so definitely warrants further investigation.

My next step – fit a webcam to my Z axis. biggrin biggrin

A short video of the result http://www.graytel.talktalk.net/rotate1.wmv

Tweakie.

Csatolások/Attachments: 5378693.jpg(91Kb)


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tweakie Dátum/Date: Vasárnap, 2012-11-25, 08:39 | Üzenet/Post # 2
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WELL - fitting a USB webcam to use with the on-screen video window could be considered akin to playing the lottery – you pay your money and take your chance. I had to smile when one member commented that ‘plug and play’ should be renamed ‘plug and pray’.

As the saying goes ‘third time lucky’. After two unsuccessful attempts, using different devices, the third ‘plug and play’ webcam works perfectly with my machine PC.

This has proved much easier and quicker than using the cross-hair pointer so I now have some more work to make this a permanent addition to my machine.

Tweakie.

$IMAGE1$
Csatolások/Attachments: 0341352.jpg(69Kb)


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KisKZ Dátum/Date: Vasárnap, 2012-11-25, 08:43 | Üzenet/Post # 3
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Quote (tweakie)
WELL - fitting a USB webcam to use with the on-screen video window could be considered akin to playing the lottery – you pay your money and take your chance. I had to smile when one member commented that ‘plug and play’ should be renamed ‘plug and pray’.


smile
 
tweakie Dátum/Date: Hétfő, 2012-11-26, 14:35 | Üzenet/Post # 4
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This is the 10mm diameter webcam and home made mounting bracket ready for fitting to my Z axis.

Tweakie.

Csatolások/Attachments: 0102113.jpg(43Kb)


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picengraver Dátum/Date: Hétfő, 2012-11-26, 16:14 | Üzenet/Post # 5
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Very Neat!
JohnC


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tweakie Dátum/Date: Szombat, 2012-12-01, 10:57 | Üzenet/Post # 6
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I have just discovered a problem with my particular little webcam – it appears that the guts are assembled to the cable then drawn into the housing and only secured at the cable exit end. When fitted to the machine, if the cable is moved (twisted) the internal image sensor can rotate slightly thus spoiling the accuracy of the positioning.

My solution was to remove (destroy) the front window, apply a couple of spots of adhesive to secure the image sensor PCB to the housing then make and fit a new window (it was doubtful if the existing window could be removed without damaging it). There is probably a better (easier) way to solve this problem but the image sensor PCB is now secure and all is well again.

Tweakie.

Csatolások/Attachments: 3863921.jpg(26Kb)


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tweakie Dátum/Date: Vasárnap, 2012-12-09, 10:24 | Üzenet/Post # 7
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I have now posted the full details of my current implementation (subject to change, in the light of experience biggrin ) here; http://hobbycncart.com/publ....-1-0-41

Tweakie.


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picengraver Dátum/Date: Szerda, 2012-12-19, 00:54 | Üzenet/Post # 8
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Tweakie,
Well, it appears that I, too, have been a victim of Chinese Quality No-Control. My camera is tight re: movement of the cable, BUT, it's alignment with the center line of the housing is off by about an estimated ten degrees. Just a small fraction of Z height shifts the view (cross hairs) rapidly to the side of the target point. It will be impossible to establish any offset values to my LD with this camera since the offset is so height dependent. Possibly an adjustable mounting (mine is now similar to yours) would allow correction, but it's not worth it to me to try and make one. I might try to remove the lens to see if it can be fixed, but have more pressing things to do just now.
John


I paint with a blue light beam.
 
tweakie Dátum/Date: Szerda, 2012-12-19, 10:12 | Üzenet/Post # 9
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Sorry to hear that John.

Guess I was lucky on this one but for my laser cross-hair pointer I had to re-machine the mounting surface of the bracket a number of times before it was in correct alignment. Could you perhaps use a shim (or two) to get it correct ??

Tweakie.


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picengraver Dátum/Date: Szerda, 2012-12-19, 23:25 | Üzenet/Post # 10
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Well, I'm not giving up. It is still a neat, small package camera and well suited for our needs. I will see about removing the housing and making a new custom one.

John


I paint with a blue light beam.

Az üzenetet módosította/Modified by picengraver - Szerda, 2012-12-19, 23:26
 
tweakie Dátum/Date: Csütörtök, 2012-12-20, 16:38 | Üzenet/Post # 11
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Hi John,

If you do end up taking it apart I would be most interested to see a picture of exactly what is inside the housing unsure

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
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