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Fórum » Only in English » Homemade CNC Machines » Anyone's CNC Machine. (Details of your new CNC machine or build project.)
Anyone's CNC Machine.
tweakie Dátum/Date: Péntek, 2013-01-25, 17:12 | Üzenet/Post # 1
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Anything and everything about your CNC machine.
 
tweakie Dátum/Date: Vasárnap, 2013-01-27, 18:27 | Üzenet/Post # 2
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My Router.

Well, I started out knowing absolutely nothing about CNC but I had the desire to fabricate RC plane parts so decided to take the plunge.

Much internet browsing later I thought I knew roughly the size and type of machine I needed to build so started searching ebay for the parts (sooner or later everything becomes available).

There seems to be a basic rule regarding machine size versus type of construction and for something small (perhaps up to 600mm x 600mm table size) a fixed gantry and stepper motors are acceptable. Anything bigger and a moving gantry would reduce the machine footprint and anything bigger still would require servo motors (mainly because of the relatively slow max. speed of stepper motors).

So, for me it was steppers and fixed gantry construction. I decided on a welded steel frame (only because I can weld) but beware, this creates it’s own set of problems. I did not have the facilities for normalization or stress relieving the finished frame so incorporated a lot of adjustment facility in the final design and build.

Perhaps I was just lucky but everything went just as planned and my routing machine was born. Time has shown that the initial design was ‘right for me’ and although much has been added over the years the basic design remains the same and I would not want to change anything.

Some pictures of the machine during it’s construction…

Tweakie.









Csatolások/Attachments: 8204734.jpg(100Kb) · 4658364.jpg(93Kb) · 0322686.jpg(82Kb) · 7341753.jpg(98Kb) · 4266428.jpg(153Kb)


Success consists of going from failure to failure without loss of enthusiasm.
 
tweakie Dátum/Date: Vasárnap, 2013-01-27, 18:29 | Üzenet/Post # 3
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When it came to the laser - the machine frame had to have a small addition. The laser beam path was decided using a little HeNe laser and some scrap MDF - then the aluminium parts were fabricated, proper mirrors and adjustable mounts fitted and a lens assembly made.
The focus lens assembly just rests in place on the Z axis (in the position normally occupied by the spindle motor) and sits on its own 3 point, adjustable, mount.

Once everything was fully aligned (using the visible HeNe laser beam) the HeNe was removed and it was time to fit the CO2 tube in its place.

Tweakie.

Csatolások/Attachments: 6566665.jpg(181Kb)


Success consists of going from failure to failure without loss of enthusiasm.
 
tweakie Dátum/Date: Vasárnap, 2013-01-27, 18:34 | Üzenet/Post # 4
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Once the CO2 tube had been fitted it was time to do all the plumbing.
A PC type radiator with 3 x 4” fans, brushless circulation pump, header tank and flow sensor were all plumbed in with silicon tubing to the laser tube’s water jacket.

The laser controller was designed made and fitted together with an imported, Chinese, high voltage power unit fitted in an enclosure with cooling fan, safety key switch and calibrated 10 turn control potentiometer.

A short video of the first laser test piece Laser

Tweakie.

Csatolások/Attachments: 7467659.jpg(173Kb)


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Vasárnap, 2013-01-27, 19:00 | Üzenet/Post # 5
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Tweakie,

Your design and fab. abilities are unmatched in our hobby. You truly are inspiring to many, myself included.

I gave up RC flying and modeling about three years ago when standing and walking became problematic. My first RC radio system was all vacuum tubes, relays, and humongous dry cell batteries, more years ago than I care to admit. The hobby has sure evolved over the decades since then. I suspect some form of hobby CNC will duplicate RC's evolution someday, albeit it may take a longer period of time.

Thanks for sharing.

John


I paint with a blue light beam.
 
tweakie Dátum/Date: Hétfő, 2013-01-28, 17:44 | Üzenet/Post # 6
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Hi John,

Thank you for the kind words.

I have now started acquiring the parts (as they become available, at the right price) to build another engraving machine – I just need to find the time to actually make a start on it.

Sorry to hear that you have had to give up the RC flying - CNC and model parts / fabrication make such a good combination.

Going a bit off-topic, I am hoping to do some more pylon racing this season and this is my 40 size Midget Mustang all ready to go. I have never actually won any of the competitions yet - perhaps my skills will improve. smile

Tweakie.

Csatolások/Attachments: 1858279.jpg(61Kb)


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Kedd, 2013-01-29, 01:36 | Üzenet/Post # 7
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Tweakie,

RC 'skills" are only achieved at the expense of model destruction (at least in my case biggrin )

BTW, good looking models - enjoy.

John


I paint with a blue light beam.
 
tweakie Dátum/Date: Péntek, 2013-02-15, 09:37 | Üzenet/Post # 8
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Just a fewpictures of my construction of a fourth axis. (It shouldbe noted that because the worm wheel is not precisely ‘hobbed’ there will be
some small variations in pitch and although this is just fine for my purpose a
more accurate method of producing this component would be necessary if the axis
is required for precision work). Tweakie.









Csatolások/Attachments: 9547205.jpg(27Kb) · 7782067.jpg(25Kb) · 1092911.jpg(28Kb) · 5587156.jpg(32Kb) · 8106549.jpg(18Kb)


Success consists of going from failure to failure without loss of enthusiasm.
 
Zolibá Dátum/Date: Péntek, 2013-02-15, 18:10 | Üzenet/Post # 9
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Idézet (tweakie)
a fourth axis.

Gyönyörű munka ez a 4. tengely.
Üdv:Zolibá
 
tweakie Dátum/Date: Szombat, 2013-02-16, 07:43 | Üzenet/Post # 10
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Thank you Zoli.

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Péntek, 2013-04-19, 01:35 | Üzenet/Post # 11
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My new Laser XY Stage arrived Tuesday 4/16, and today I assembled it in about 1 hour.  The parts arrived well packaged, but with no assembly
instructions, which I probably would not have read anyway. smile

For the price of this unit, I am very pleased with its quality. All parts fit perfectly, and I only had to bend one small roller bracket just a little so the roller was in the right position.   It moves smoothly and has no free play that I can
feel.  This is a well thought design.

Now, all I have to do is devise a mounting for my laser diode, and it should hopefully soon be operational.

Engraving area is 16 x 24 inches / 400 x 600 mm.

A short crude video of it moving manually is here:
www.picengrave.com/Laser XY/Laser XY.wmv

Regards All,
John Champlain

 
Csatolások/Attachments: 9492998.jpg(294Kb) · 7015404.jpg(296Kb)


I paint with a blue light beam.
 
tweakie Dátum/Date: Péntek, 2013-04-19, 11:19 | Üzenet/Post # 12
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That's excellent John - it looks and sounds so smooth. cool

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
JJWMACHINECO Dátum/Date: Péntek, 2013-04-19, 12:03 | Üzenet/Post # 13
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That's slick John.

I can see some fine laser engravings in the near future.  thumb

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
picengraver Dátum/Date: Péntek, 2013-04-19, 12:09 | Üzenet/Post # 14
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Hi Tweakie,

Yes, the assembly moves very smoothly by hand.  The gantry runs on linear ball bearings, and the laser carriage rollers have small ball bearings and eccentric adjustments for fine adjustment.

In order to keep the weight of the laser mount and heat sink (moving mass) to a minimum, I am considering the use of water for cooling.  I'm beginning to wish I had more laser power available so I could use a standard moving mirror assembly.  I can always switch to a CO2 setup if this proves too impractical for laser diode use.

The fast part of this build is obviously done; the rest will take longer than I want. sad  

John


I paint with a blue light beam.
 
JJWMACHINECO Dátum/Date: Péntek, 2013-04-19, 18:36 | Üzenet/Post # 15
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John,

I have thought about water cooling also, then I thought about the condensation that will be collecting because the humidity and temp. changes and may ruin the laser diode. Something to think about.

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
picengraver Dátum/Date: Péntek, 2013-04-19, 21:09 | Üzenet/Post # 16
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Jeff,
Good point.  Thanks, I had not considered it.  If I can keep the water temperature above the dew point, then it might be OK.

BTW, please tell your wife that she was right; the last picture is much better.   I'll have to remember that lesson.  yes

John


I paint with a blue light beam.

Az üzenetet módosította/Modified by picengraver - Péntek, 2013-04-19, 21:12
 
picengraver Dátum/Date: Szerda, 2013-05-08, 01:17 | Üzenet/Post # 17
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I'm slowly making progress on my new machine.  I gave up on using water cooling; it would have added too much complication, weight, and drag on the laser carriage.  So this past weekend I was able to fabricate and mount a heat sink and fan.  Still need to make a metal mount for the fan to replace the plywood in the pictures.  I made the heat sink from an old CPU heat sink I had laying around.  The fan will not only cool the diode, but it will also blow the smoke away from the laser lens.

Hopefully I should have it all wired up and running sometime next week, if I can finish a cabinet for it this next weekend.
John
 
Csatolások/Attachments: 4639718.jpg(29Kb) · 2681119.jpg(24Kb)


I paint with a blue light beam.
 
tweakie Dátum/Date: Szerda, 2013-05-08, 07:42 | Üzenet/Post # 18
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It's looking good John. ok

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Csütörtök, 2013-05-09, 03:33 | Üzenet/Post # 19
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Thanks Tweakie,
I spent today laying out a pc board for the new DAC I'm going to build.  I'm using the MAX 5451 digital potentiometer chip, courtesy of Jeff.  Seems to work very well bread boarded.

John


I paint with a blue light beam.
 
tweakie Dátum/Date: Csütörtök, 2013-05-09, 11:27 | Üzenet/Post # 20
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Hi John,

I look forward to seeing some more pics. as your build progresses - keep up the good work my friend. smile

Tweakie.


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