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Thread started 21 Apr 2013 (Sunday) 04:18
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DIY motorized panohead

 
welcomb
Hatchling
7 posts
Joined Apr 2013
Location: Singapore
     
Apr 21, 2013 04:18 |  #1

Hi,

I'm about to embark on building a motorized panohead. With my background in computing I don't see much issues with the electronics and programming logic. What I baffles me is the mechanical support and structure needed.

I have found Sean's very sleek and elegant design (external link) and I'm considering adapting it. I noticed several very knowledgeable members here that's why I registered to ask for advice.

A common design for a motorized panohead would be to support the pan rotation fully on the motor. As I'm going to be using a cheap stepper motor, I don't think it's likely to support the mechanical forces. So I'm going to use Sean's thrust bearing design and put the motor on the top. I've rendered my idea in an exploded view in Sketchup:

IMAGE: http://farm9.staticflickr.com/8529/8668111886_d86b882b83.jpg

Essentially I'm attaching the motor's body with M2.5 screws to the horizontal arm, then coupling its shaft to an M8 or M10 bolt or lead screw which is used as the axle. The M2.5 screws would need to be rather long to cover the length of the coupler. Will that be an issue?

Any comments or advice is very much appreciated. Thank you.



  
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P51Mstg
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Location: Mt. Carmel, TN
     
Apr 21, 2013 09:12 |  #2

http://www.servocity.c​om …ss_pan___tilt_s​ystem.html (external link)

I've got one of these and it works great.... If you are building your own, you may well want to look at their site for some ideas or off the shelf parts to save you some time...

Mark H


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welcomb
THREAD ­ STARTER
Hatchling
7 posts
Joined Apr 2013
Location: Singapore
     
Apr 21, 2013 22:23 as a reply to  @ P51Mstg's post |  #3

Commercial solutions are nice but unfortunately I do not have the budget for it. The 5:1 reduction gearing looks good, but it adds complexity to the build which I'm trying to avoid. The head's not gonna pan that quickly so I hoping a direct drive stepper should have enough torque. Now for the tilt head, I might need a robotic servo instead.

That said I do have access to a 3D printer to fabricate the motor mounts though.




  
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luciddreamer
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Location: NE Indiana
     
Apr 22, 2013 09:34 |  #4

I'm in the process of making a gimbal head so this caught my attention. That drawing looked familiar!

M2.5 screws are rather small. They seem to be too small to me but then I don't know just how much weight and torque you'll be creating with it. If you have problems you could perhaps surround the motor with keys (small blocks screwed to the cross bar) to prevent twisting. Not sure if you'll have lifting problems. With something like this it's often a try it and see scenario.


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welcomb
THREAD ­ STARTER
Hatchling
7 posts
Joined Apr 2013
Location: Singapore
     
Apr 24, 2013 02:41 |  #5

The drawing's familiar cos it's based on Sean's design, and 5teve drew one before.

I need to use M2.5 screws cos that's what the motor mount holes are. I could use a slightly bigger motor that takes M3 screws. I've been thinking how to assemble this and think I'll have to have the coupler exposed to attach it to the motor shaft.

Alternately I can use a separate motor mounting plate and mount that to the arm with M5 bolts and nuts (see attached image).


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DIY motorized panohead
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