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DAVID-Laserscanner Forum • View topic - High loadable turntable
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High loadable turntable

Which camera works? Where can you buy an adequate laser? And more...

High loadable turntable

Postby WalterMo » Sat Jan 24, 2015 3:57 pm

This turntable is the Goliath among the other tables which I had posted before:
viewtopic.php?f=6&t=2383
viewtopic.php?f=6&t=4291

It can withstand loads up to 200kg (per producer). But I never have tested the table with such high loads, only up to about 20kg. The (static) load is one thing, the other is that the mass also must be acceletated (against the inertia). Therefore I have implemented acceleration and deceleration ramps of the stepper motor speed.

The gear ring and its carrier ring are mounted together to one device. They are made of a very stable plastic. The upper ring is mechanically assisted by a lot of steel balls:

http://www.ebay.de/itm/Kugellenkkranz-L ... 43c73a7e13

The stepper motor with a planetary gear came from here:
http://nodna.de/nema-17-planetary-518-1-stepper-motor

The black plastic box for the motor is this:
http://www.conrad.de/ce/de/product/5384 ... 1GSBK-1-St

A cogwheel (it comes with the rings unit) is mounted at the gear's output shaft to drive the gear ring. An advantage is that the motor is lying horizontally, so the total height of the device is rather low.

Dimensions: Diameter of the platter: 280mm, overall height: 63mm.
Further specifications:
gear ring: 139 cogs
pinion: 24 cogs
gear ratio ( table gear ring / pinion): 5.79 / 1
gear ratio (motor / planetary gear): 5.1818 / 1
motor driver board: Pololu A4988 (¼ micro step mode)
platter: aluminium, 5mm thick
square plate: 300 x 300 mm, aluminium, 5mm thick
controller: Arduino Uno
power supply: 9V wall wart

Walter
Attachments
Gesamtansicht.jpg
VonObenTellerWeg.jpg
Platter removed
AnsichtVonUnten.jpg
VonUntenMotordeckelWeg.jpg
Motor box: lid removed
Bild12reduziert.jpg
Bild10reduziert.jpg
The opened controller. See the little fan downright.
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Re: High loadable turntable

Postby JDM Dyno » Sun Jan 25, 2015 12:19 am

looks very good Walter


be interesting to see how much It will take without stripping the plastic gears

I've done this one and tested with over 70 kg, turns ok but need a lower gearing to stop it wobbling when it stops turning, only 2:1 at the moment, I was going to put acceleration and deceleration on to help to.
DSC_0010[1].jpg

its a bit ruff at the moment but just testing with things I have already, mostly scrap
Camera's: 2 x DFK 42BUC03 Duel Camera,
c615 modified with Computar megapixel lens
lenses: 2 x Pentax 12mm, 2 x Computar 8mm
Optoma ML300 Projector
Turntable

www.jdm-dyno.co.uk
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Re: High loadable turntable

Postby hunkatibor2 » Sun Jan 25, 2015 11:10 am

Hi Walter
Worthy, precise and beautiful solution. :D :D :D
Tibor
Intel Xeon E5410 2.33GHZ 16GB RAM Windows 7 64bit David 4.5.0
2 Basler A622F camera 2 Tamron Asfirical AF 28-80mm lense
LG DLP Projector PF1500G Canon D40 Tokina 17-70mm 1:2.8-4,5
Humanti Calibration panel system and Alignmed&Two camera
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Re: High loadable turntable

Postby Jokeri » Sun Jan 25, 2015 3:15 pm

Hello Waltermo!

Can you share the code please!

I wish that you posted this sooner!



Thanks,
TT
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Re: High loadable turntable

Postby WalterMo » Sun Jan 25, 2015 4:31 pm

The controller hardware (circuit diagram) is very similar to this:
download/file.php?id=6825&mode=view
I forgot to draw in two 1kOhm resistors. Each from the input pins 6 and 7 of the Arduino to 5 Volts. The resistor R3 is optional, for details see my first post here:
viewtopic.php?f=6&t=4291

Only the inputs MS1 and MS2 of the Pololu for micro stepping are a bit different. Means the switch for MS1 = off and for MS2 = on. Don't forget to glue a small heatsink on the Pololu IC. And add a little fan if necessary.
And here is the code:

Edit: Version Leo3_3 doesn't need the two mentioned above resistors. Regarding resistors: There are only 2 resistors at the angle increment switch necessary. See the attached circuit diagram.
Attachments
Turntable_Leo3_2.zip
(3.24 KiB) Downloaded 249 times
Turntable_Leo3_3.zip
(6.66 KiB) Downloaded 239 times
turntablebig.jpg
Circuit diagram of the Controller Leo 3
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Re: High loadable turntable

Postby WalterMo » Mon Jan 26, 2015 1:06 pm

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Re: High loadable turntable

Postby micr0 » Tue Jan 27, 2015 8:27 pm

Thanks WalterMo.

I've been building a 2ax trunnion that is big enough to hold engine parts for scanning. I'm waiting on the second stepper and drive, and to finish the control panel design, but here are a few pictures of my current progress. I designed to be easily disassembled and laid flat in a storage case.

µ

Youtube video:
Attachments
Rotary 1.jpg
Rotary 3.jpg
Rotary 2.jpg
µ
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Re: High loadable turntable

Postby JDM Dyno » Tue Jan 27, 2015 10:33 pm

looking really good micr0

was thinking of something like that myself https://www.youtube.com/watch?v=HfuM0xw ... DA9BA6D3A5

check out this video to, at about 3 minuets it gives the price :o

https://www.youtube.com/watch?v=4AypqqyBTWg
Camera's: 2 x DFK 42BUC03 Duel Camera,
c615 modified with Computar megapixel lens
lenses: 2 x Pentax 12mm, 2 x Computar 8mm
Optoma ML300 Projector
Turntable

www.jdm-dyno.co.uk
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Re: High loadable turntable

Postby WalterMo » Sat Feb 28, 2015 11:35 am

For those who need a more powerful stepping motor driver board.

Here it is. It has the Toshiba-IC TB6560 AHQ on board which can drive a peak current up to 3.5 A per motor phase. It's coming from China but you can also buy it in Berlin, Germany:
http://www.ebay.de/itm/SainSmart-CNC-Ro ... AQ:DE:1123

Maybe it's even possible to beat down its price. Anyway they offer a price proposal.

It is easy to use, similar to the Pololu A4988. But it has some more features which can simply be adjusted by mini switches. And it is mounted on a sufficiently big heatsink.
Unfortunately it doesn't has the possibility to choose 1/4 step mode, only 1/1, 1/2, 1/8 and 1/16. I mention this because my Arduino code 'Turntable_Leo3_3' some posts above was programmed for 1/4 step mode.
Attachments
Foto8reduz.jpg
Turntable controller with the new board from SainSmart
turntablebig2.jpg
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Re: High loadable turntable

Postby ThomasSc » Sat Feb 28, 2015 12:24 pm

Attachments
28.JPG
27.JPG
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Re: High loadable turntable

Postby micr0 » Sat Feb 28, 2015 6:20 pm

µ
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Re: High loadable turntable

Postby WalterMo » Sat Feb 28, 2015 7:07 pm

Hi micr0,

3 years ago I had built a 2 axis positioner:
viewtopic.php?f=6&t=4154

Maybe you can take some ideas from the design/code. There are 2 pins free on the Arduino Uno for your special modification.

I have just looked on ThomasSc's design and code (2 posts above). He is already using the powerful motor driver from SainSmart. And I thought I would be the very first user/pioneer on this forum. :oops:

Thomas has used an elegant way to program the code. Simply by calling up the Arduino pre-built library 'AccelStepper'. I didn't know it before.
This subroutine contains already accelelation and deceleration for the motor speed. :idea:

Walter
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Re: High loadable turntable

Postby micr0 » Sat Feb 28, 2015 8:01 pm

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Re: High loadable turntable

Postby micr0 » Tue Mar 03, 2015 9:30 pm

Attachments
Pendant elect 4.jpg
Pendant1.jpg
Pendant elect 2.jpg
µ
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Re: High loadable turntable

Postby JDM Dyno » Wed Mar 04, 2015 12:17 am

like the panel very cool

I have a 128 x 64 lcd that I am going to use if I get time, already done an ECU display with one and a Haldex controller with another with arduino

172.jpg

176q.jpg
Camera's: 2 x DFK 42BUC03 Duel Camera,
c615 modified with Computar megapixel lens
lenses: 2 x Pentax 12mm, 2 x Computar 8mm
Optoma ML300 Projector
Turntable

www.jdm-dyno.co.uk
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