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Author Topic: Hypocycloid Gearbox  (Read 8289 times)
csirocnc
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« on: February 05, 2015, 04:03:10 am »

I finally finished my 3D printer and found that the steps/mm for the extruder was a bit course so I designed a 10:1 reduction gearbox using CB's Hypocycloid generator.


* IMG_20150130_143637.jpg (529.37 KB, 2560x1920 - viewed 723 times.)

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* IMG_20150130_144139.jpg (642.12 KB, 1920x2560 - viewed 477 times.)
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elf
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« Reply #1 on: February 05, 2015, 06:00:37 am »

How about a few pictures of the printer?  Can you share the drawings for the gearbox?
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Bubba
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« Reply #2 on: February 05, 2015, 12:12:15 pm »

Nice!
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csirocnc
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« Reply #3 on: February 05, 2015, 21:43:58 pm »

Build area is X-200 x  Y-200 x Z-200 mm.
Firmware is Marlin

Hardware SainSmart kit
RAMPS 1.4
Mega 2560 R3
A4988 driver
LCD 12864 With Controller
RAMPS 1.4 wiring cable
Heatbed MK2b
thermistor For headbed(100K ohm)
Assembled J-head Hotend Nozzle.

Just need to work out why the power cuts out to the bed when it reaches 36 deg C
Drawings on the way


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* IMG_20150102_170115.jpg (776.12 KB, 2560x1920 - viewed 407 times.)
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sibianul
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« Reply #4 on: March 25, 2015, 17:10:01 pm »

I finally finished my 3D printer and found that the steps/mm for the extruder was a bit course so I designed a 10:1 reduction gearbox using CB's Hypocycloid generator.


Awesome, please can you tell me if there are any dissadvantages of this type of reduction ?

It's the only reduction gear I can make on my cnc and I was thinking to make one for a DSLR slider, I want to make one for timelapse but also use it for videos and for videos a standard nema 17 stepper is not smooth enough, I never tried 0.9 degree step motors but I think those are not enough smooth at low speed (ramping up/down  from/to 0 while filming ).

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csirocnc
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« Reply #5 on: March 25, 2015, 21:19:37 pm »

The only disadvantages issues for some applications are

1- they cannot be back driven
2- Depending on the size It may need to be balanced to cut down vibration
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« Reply #6 on: March 25, 2015, 23:46:32 pm »

By back driven do you mean driven by force applied to the output shaft?
I am also very curious about the design and what you used to create the gear profiles. Also is there a backlash and is it possible to eliminate it. Yep, you guessed I am thinking about rotational axis application Smiley
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csirocnc
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« Reply #7 on: March 26, 2015, 02:11:20 am »

Yes you cannot drive the output shaft

Their is a Hypocycloid script for CB here
 http://www.cambam.co.uk/forum/index.php?topic=3497.msg22739#msg22739

I attached the CB file I designed my housing around along with a drawing with some of the dimensions on it
I still have to draw up the input and output shafts.

* Reduction Box .pdf (50.03 KB - downloaded 226 times.)
* Nema 23 Reduction Box.cb (12.79 KB - downloaded 194 times.)
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sibianul
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« Reply #8 on: March 30, 2015, 14:34:35 pm »

This is a good new, that you can't drive the output shaft.

The DSLR slider I want to make is mainly for timelapse photography, but also for video, I chosed to use steppers as those hold the position well even when are not rotating, but energized, for night timelapses the shutter of the camera is opened maybe even for 30 seconds or more, while the shutter is opened the camera must stay in the same place even if the slider is mounted angled (maybe I start the timelapse with the camera near the ground and finish it one hour later with the camera at 1.5m above the ground).

But the reason those reduction gears come very handy is a motorized pan & tilt head, especialy for the tilt axis where the force is much higher when larger lenses are used.

Thank you for the files also. Will keep in touch and let you know If I have any problems making the reduction gearbox.

Here's a great video with a timelapse for those that are not familiar with this kind of photography, hope I can make something similar this year Cheesy, the projects I want to finish in 2015 are : DSLR 3 axis Slider, DLSR Cable Cam and a DSLR Brushless Gimbal (this one is almost ready)

https://www.youtube.com/watch?v=iblfVkIdmkg
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lloydsp
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« Reply #9 on: March 30, 2015, 14:37:34 pm »

Simply STUNNING!  Applause!

How do you achieve the dollying?

Lloyd
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« Reply #10 on: March 30, 2015, 21:11:33 pm »

Indeed, the video is simply stunning and the only way to make something similar is by using a motorized slider!

Commercial products sell for a few hundreds to a few thousands (the ones that move on multiple axes: slide, pan, tilt), but for people who want to build it -> the best and cheapest option is by using OPENBUILDS profiles, I've searched more than an year for cheap linear guides, I tried last year with some round linear bearings, but ware mounted on 2 carbon fiber rods I had around, didn't like how it feeled when sliding (because I haven't used rectified round bar for the bearings, which is expensive)

Now I'm not searchng anymore, I have received the profiles and wheels purchased from open builds and I'm exremely happy, I only need time a few full days to finish my projects, but with two little kids is hard to find time for hobbies Sad

Here's a video with the profiles  https://www.youtube.com/watch?v=JXK3xx063Ic And here's a video whe I first tested the electronics and the program I wrote for arduino to drive the motor. Since than I made some improvements and now the camera is triggered wirelessly, but still need to work a lot to finish it.
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