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steppermotor advice

steppermotor advice

Postby timtom1 » Sun Jul 18, 2010 2:57 pm

Hello,

I am new here.

I have seen Hal's and many others work and am blown away by the accuracy. I haven't bought the starter kit yet.

One thing I don't know how to build is a stepper motor control for the laser as I know this is important to get accurate scans.

Can anyone help with a step by step guide on how to build one? I live in the UK.

regards

Tim
PC:Intel Core i5-760, 4 Gb RAM, nVidia GeForce GTX 460.
SO:Win 7 64Bit.
SOFTWARE:DAVID 2.6.1, 3ds Max 9 sp2 (32 bit), Netfabb Studio, MeshLab.
CAM/LENS: ~ Logitech 9000
LASER: ~ LE650-5-3-F-S(22x100)90 (RED)
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Location: United Kingdom

Re: steppermotor advice

Postby Oneinwhite » Sun Jul 18, 2010 5:31 pm

If you read through this thread you'll see my fight with the same issue:

viewtopic.php?f=6&t=1999

I eventually bought my motor from nanotec as they seemed one of the easier people who provided stepper motor with the necessary gear boxes. I think assembling your own would be quite difficult, though maybe someone else would know more there!
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Re: steppermotor advice

Postby WalterMo » Sun Jul 18, 2010 8:17 pm

Regarding motor and gear and so on, have a look to this thread:
viewtopic.php?f=9&t=1993&p=12334#p12334
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Re: steppermotor advice

Postby timtom1 » Sun Jul 18, 2010 9:08 pm

thanks for the replies.

I've ordered the plans from here to make one without motors possibly

http://papertosolids.com/Store/products ... ings.html#


or could somebody in or near the UK make one for me?
PC:Intel Core i5-760, 4 Gb RAM, nVidia GeForce GTX 460.
SO:Win 7 64Bit.
SOFTWARE:DAVID 2.6.1, 3ds Max 9 sp2 (32 bit), Netfabb Studio, MeshLab.
CAM/LENS: ~ Logitech 9000
LASER: ~ LE650-5-3-F-S(22x100)90 (RED)
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Location: United Kingdom

Re: steppermotor advice

Postby WalterMo » Mon Jul 19, 2010 6:38 am

Hello Tim,

I am really very curious what kind of drive the plans will show for 19.95$. But perhaps you aren't allowed to let out the secret.

Walter
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Re: steppermotor advice

Postby timtom1 » Mon Jul 19, 2010 6:02 pm

Hi Walter,

Thank you for your pm, what quality are the scans on the starter kit? I want to scan a Sea King model like the picture attached.

Will there be more reworking needed and would it pick up fine detail?

Image

I understand I would have to dismantle some of the model to get a full 3d object.
PC:Intel Core i5-760, 4 Gb RAM, nVidia GeForce GTX 460.
SO:Win 7 64Bit.
SOFTWARE:DAVID 2.6.1, 3ds Max 9 sp2 (32 bit), Netfabb Studio, MeshLab.
CAM/LENS: ~ Logitech 9000
LASER: ~ LE650-5-3-F-S(22x100)90 (RED)
timtom1
 
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Location: United Kingdom

Re: steppermotor advice

Postby WalterMo » Mon Jul 19, 2010 6:55 pm

Such a helicopter to scan is a work for a specialist like Mattia (hal). Here I am really overwhelmed.
Of course some parts must be dismantled and scanned separately and the windows must be coated.

Perhaps Mattia can tell you how to do it and how many single scans are necessary.

Regarding the hardware which I would use: Green focusable laser, not the starter kit, self-built calibration corner and the Logtech 9000 or a CCD camera from the DAVID shop.
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Re: steppermotor advice

Postby timtom1 » Mon Jul 19, 2010 7:05 pm

thank you again for your help, are my PM's getting back to you?
PC:Intel Core i5-760, 4 Gb RAM, nVidia GeForce GTX 460.
SO:Win 7 64Bit.
SOFTWARE:DAVID 2.6.1, 3ds Max 9 sp2 (32 bit), Netfabb Studio, MeshLab.
CAM/LENS: ~ Logitech 9000
LASER: ~ LE650-5-3-F-S(22x100)90 (RED)
timtom1
 
Posts: 19
Joined: Sun Jul 18, 2010 2:28 pm
Location: United Kingdom

Postby hal » Mon Jul 19, 2010 9:24 pm

Hello timtom1,

As Walter wrote, a CCD camera is a good choise. Obviously all depend from your purpose. If you want to scan this object only for fun, a webcam is enough, but for professional results, a CCD monochrome is better.
If you need a great scan of details and textures, I suggest to sacrify the texture grab from David and completely coat your whole object and only after take many photos of your object in all its sides. Obviously after you need to redraw the final mesh and create a UV set of maps, with other 3D and 2D software (3D Coat, ZBrush and Photoshop are enough). So, first to start with any suggestion, tell us you purposes, and we can help you better.

With webcam or a CCD camera, take in mind that you must dismantle you model as possible. If you can scan it into several different pieces, and if these pieces are small, is better (scanning little portions allow you to use the camera's pixels better to survey all the finest details).

But first of all, I need to know the size of the model.

Best Regards,
Mattia

p.s.: probably for some pieces, like the propellers, is better that you use a precise caliber and measure and model every propeller by yourself. David, as many other 3D scanners have some problems with thin objects, because is hard to aligh the upper parts with the lower (few common points of contacts).
PC: DELL Alienware 17, Intel I7-4710MQ, 32 Gb Ram, AMD Radeon R9 M290X 4GB.
SO: Win 8.1 64Bit.
CAMs: USB 3.0 CMOS B/N (1280x960, 60 fps).
LENS: 12 mm.
PROJECTOR: DAVID SLS1 ACER K11.
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Re: steppermotor advice

Postby timtom1 » Tue Jul 20, 2010 4:57 pm

Thanks Mattia

This is just an example of what I eventually want to professionaly scan after a lot of practise. I would make a similar model and just paint it white. I would be able to scan it in parts.

For the purpose I would like a highly detailed 3d model of the Sea King helicopter as I love this type. In the future I would possibly like to get it CNC machined maybe a larger version but for now just as a 3d model.

The size of the model is approx 11 inches long without rotors (propellers).

My current PC spec is
Win XP Pro
Pentium 4, 2.4Ghz
2 GB of RAM
ATI Radeon HD 2600 XT (512)MB

All the best
Tim
PC:Intel Core i5-760, 4 Gb RAM, nVidia GeForce GTX 460.
SO:Win 7 64Bit.
SOFTWARE:DAVID 2.6.1, 3ds Max 9 sp2 (32 bit), Netfabb Studio, MeshLab.
CAM/LENS: ~ Logitech 9000
LASER: ~ LE650-5-3-F-S(22x100)90 (RED)
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Posts: 19
Joined: Sun Jul 18, 2010 2:28 pm
Location: United Kingdom

Postby hal » Tue Jul 20, 2010 10:49 pm

Hello Tim,

so, if you wnat to start with Pro experience, you need:

- CCD B/W camera;
- a focusable laser;
- a strong and precise calibration corner.

I don't think that you need a panel-less scanning, with the small pieces.
With panels in scene, you can build an open (open window angle) and scan all that you need, without a precise stepper motor.
However, just to have a better results, you need a motor (stepper or other) that move the laser quite slowly and smooth.

Your purposes fit perfectly with the David capabilities and seems ok to abtain great results, and quite easy. I think that a purchase around 1.000/1.200€ (1.200/1.500$ or 850/1.000£ ) is enough for all the stuff that you need.

About your computer specs, I think that only problem could be the RAM amount.
With 4Gb on my laptop, sometime I can't fuse the meshes at higher values, so probably, 2GB maybe are not enough for the best final results.
But this is only the last problem of yours... the RAM amount is every time modifiable (motherboards permitting).

Best Regards,
Mattia
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Re: steppermotor advice

Postby timtom1 » Wed Jul 21, 2010 8:40 am

thanks Mattia,

I was looking at budgeting around 1,200 Euros. I can only see the colour CCD camera in the David shop but it comes with a 6mm lens would this be ok?

I am probably going to buy a new PC soon as this one is quite old.

I did buy the http://papertosolids.com PDF on how to build a motion control without stepper motors but I am not impressed. So I am back to the same problem really of where to start with building one, I've seen your set up on youtube with the iron man scan and really like that idea.

All the best

Tim.
PC:Intel Core i5-760, 4 Gb RAM, nVidia GeForce GTX 460.
SO:Win 7 64Bit.
SOFTWARE:DAVID 2.6.1, 3ds Max 9 sp2 (32 bit), Netfabb Studio, MeshLab.
CAM/LENS: ~ Logitech 9000
LASER: ~ LE650-5-3-F-S(22x100)90 (RED)
timtom1
 
Posts: 19
Joined: Sun Jul 18, 2010 2:28 pm
Location: United Kingdom

Postby hal » Wed Jul 21, 2010 11:27 am

Hello,

Yes, the 6 mm lens is ok. With a short focla lenght, you can stay more close to the object and see a better (bright and contrasted) laser line. However, you can easily change the lens if you aren't satisfy, with a 12 mm.
But I think that the David camera is perfect for your purposes.

Mattia
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Re: steppermotor advice

Postby timtom1 » Wed Jul 21, 2010 1:01 pm

The kit I plan to buy

1x Green Line Laser, Adjustable Focus, 5mW, incl. battery
Typ:LE532-5-3-F-S(22x130)90

1x DAVID USB CCD Monochrome Camera (XGA) with Lens
Typ:DAVID-CAM-1-M

1x DAVID Laserscanner Professional Edition USB
PC:Intel Core i5-760, 4 Gb RAM, nVidia GeForce GTX 460.
SO:Win 7 64Bit.
SOFTWARE:DAVID 2.6.1, 3ds Max 9 sp2 (32 bit), Netfabb Studio, MeshLab.
CAM/LENS: ~ Logitech 9000
LASER: ~ LE650-5-3-F-S(22x100)90 (RED)
timtom1
 
Posts: 19
Joined: Sun Jul 18, 2010 2:28 pm
Location: United Kingdom

Re: steppermotor advice

Postby WalterMo » Wed Jul 21, 2010 1:43 pm

I wouldn't buy the green LE532-5-3-F-S(22x130)90 with battery. Better is to use this 5mW one:
https://ssl.david-vision-systems.de/sho ... 41ad207b6d

supplied by this 3 Volt wall power supply:
https://ssl.david-vision-systems.de/sho ... 08cbc442af

The reason is: A green laser with the same optical power as a red one needs about six times more current.

Second reason: You cannot switch the laser on or off if you like to control it (sometime) by a microcontroller for the planeless scan technique.

Walter

P.S. Ay me! You have very different plugs in UK.
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