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(moved) Geared Follow Focus

by MarcusWolschon, published

(moved) Geared Follow Focus by MarcusWolschon Jun 14, 2011
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Summary

THIS DESIGN HAS BEEN MOVED TO YOUMAGINE:
https://www.youmagine.com/designs/geared-follow-focus

Reasons:
http://marcuswolschon.blogspot.de/2014/01/leaving-thingiverse.html _____

After my gearless follow focus,
here a geared one.
Swapping the lens is not as easy as it is with the gearless one and you need a lens-gear for every lens but you also need no pressure to create friction.
The follow focus and lens gear are compatible with industry standard 0.8 pitch follow focus equipment.
The axis use 608 bearings to reduce any noise of threaded rods on plastic that could be picked up by the microphone and to make this run as smooth as possible.
The mounting is for an industry standard 15mm rail support system such as
my 3d printed shoulder rig:

http://www.thingiverse.com/thing:7278

With a follow focus you have precise, manual control over the focus (or zoom) of your lens.
It is used for professional filming where precise control of the focus is required and where a pumping autofocus would simply ruin the take.
Commercial versions are sadly terribly expensive. :(

Photos:

https://picasaweb.google.com/Marcus.Wolschon/201105_201106_geared_follow_focus?feat=directlin
Blog post:

http://marcuswolschon.blogspot.com/2011/06/3d-printed-geared-follow-focus.html

Video (Part I)

http://www.youtube.com/watch?v=imy2UaUzNeY

Update: (2011-07-17)
Added lens_gear_version3 with a wider tap for the bolt.

Instructions

The large part may not print on a Thing-o-Matic but require a printer with a larger build volume such as a RepMan or RepRap.

  • Use the hand-wheel from litwan, it works better then mine. :)

  • fit the gears with the bearings. Do not fit the bearings first then then try to insert the gears. It will not work and can be quite hard to remove the bearings to try again.

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Hello Marcus,

As far I can see is a missing part... I can't find the handling wheel. Thank you for your help.

I'm not sure how to assemble an axis. Has anyone a video or detailed picture?

You stick the bolts through the gears, the bearings into the 22mm holes and stick everything together.
There is only one way for things to fit.

Does there happen to be a hardware list somewhere for this?

When I posted this, there was a BOM of all parts needed but aparently Makerbot Industries removed the entire BOM-feature from Thingiverse, when they did the new UI.

By looking at your uploaded picture of partial measurements I was able to figure out the m8 hardware for the main functions, well and the bearing mention, I was just curious on the length of bolts I should go with. I will of course have that answer in a few hours when this finishes printing.

I might avoid the standard 15mm rods (as I have tried to do for a while now) and instead adapt this to a single carbon square tube made from a hockeystick. Luckily, your design is perfect for adaptation.

Looks like 30mm length bolts

Good stuff Marcus. Thank you!!!

This looks great, I've been toying around with DIY follow focus solutions, but this looks to take the cake!

I have a question -- is there any possibility you can add in a marker ring behind the dial to mark focus points? And along those lines, is there any chance of seeing this design with a couple of adjustable hard-stops? I don't know how complicated that would be, but it would be fantastic.

Goin
g to go ahead and try this out as-is at the moment!

You can cut a paper marker-ring for the handle-wheel. No problem.

I tried a marker-neede and it was not stable enough.

Didn't try hard stops.

Feel free to design hard stops yourself. You have the original, parametric CAD files to do so and the XPress edition of Alibre is free.

hey i can't seem to get the repariert file to open. just comes up blank :(

Well it renders fine on Thingiverse, NetFabb and Skeinforge/Replicator-G worked when I printed 2 of them....can't help you.

I added a new lens_gear with a wider tap for the bolt.

Marcus, your designs are often so interesting that it makes me want to get into photography! Seriously, seeing what I can do with my printer, and some steel rods inspires me to go beyond simply using my tripod.

I suggest aluminum instead of steel. ;)

Thank you!

Feedback like this is what keeps me going. :)

(In a few minutes I'll upload a new video tutorial to http://www.youtube.com/user/MarcusWolschonhttp://www.youtube.com/user/Ma... about redoing the wiring inside a chinese $24 microphone to get some really usable sound.)

Excellent! This will be one of the first things I print!

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