8mm Forum: Anyone have dimensions of 9.5mm sprockets?

This is topic Anyone have dimensions of 9.5mm sprockets? in forum 9.5mm Forum at 8mm Forum.

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Posted by Billy Blair (Member # 6068) on May 30, 2018, 04:20 AM:

As title. Im looking for the exact dimensions of a typical 9.5mm sprocket so I can 3D print some.

Thanks.

Posted by Allan Broadfield (Member # 2298) on May 31, 2018, 10:23 AM:

If you haven't already tried, look up 9.5mm film on Wikipedia. It gives all the dimensions.

Posted by Billy Blair (Member # 6068) on May 31, 2018, 11:01 AM:

Hi. Wikipedia only lists the films dimensions. Not the sprocket itself. [Frown]

Posted by Luigi Castellitto (Member # 3759) on May 31, 2018, 01:01 PM:

Billy, Here it should be. [Smile]

http://pierreg.free.fr/cine95/c95tech.htm

Posted by Billy Blair (Member # 6068) on May 31, 2018, 01:53 PM:

Awesome! Thats exactly what I need!! I owe you a beer. [Big Grin]

Posted by Allan Broadfield (Member # 2298) on May 31, 2018, 03:10 PM:

Wikipedia includes the sprocket dimensions too.

Posted by Billy Blair (Member # 6068) on May 31, 2018, 04:27 PM:

@Allan: The only thing I could find is this which only mentions film dimensions: Wikipedia 9.5mm Film

Posted by Allan Broadfield (Member # 2298) on May 31, 2018, 05:09 PM:

It appears to give the width and height of the perforation.

Posted by Allan Broadfield (Member # 2298) on May 31, 2018, 05:15 PM:

It appears to give the width and height of the perforation.

Posted by Billy Blair (Member # 6068) on June 01, 2018, 03:09 AM:

Unfortunately width and height of perforation wasnt enough!

Posted by Allan Broadfield (Member # 2298) on June 01, 2018, 03:35 AM:

Ok, I'm obviously not au fait with things 3D - I still have probs with the smart phone!
Thanks.

Posted by Billy Blair (Member # 6068) on June 01, 2018, 04:14 AM:

No worries! Ill post a link to the final 3d object in case anyone wants to use it.

Posted by Luigi Castellitto (Member # 3759) on June 01, 2018, 07:31 AM:

My pleasure, Billy!
A good old Ale! [Wink]

Posted by Billy Blair (Member # 6068) on June 10, 2018, 01:23 PM:

If anyones interested, Here's the 3D object to print from. It's not been tested though as I don't have a 3D printer so may need modifying. I designed it so the image area of the film isn't touching the sprocket.

Download STL file

[ June 10, 2018, 03:51 PM: Message edited by: Billy Blair ]

Posted by Terry Sills (Member # 3309) on June 11, 2018, 01:54 AM:

I can understand that the flat surfaces between the sprockets would protect the film surface/ emulsion, but why the irregular outer rims? This would only serve to damage fragile or brittle film. Surely a simple circular shape would be better. All film sprockets have that feature.

[ June 11, 2018, 10:13 AM: Message edited by: Terry Sills ]

Posted by Billy Blair (Member # 6068) on June 11, 2018, 03:12 AM:

Thats just the way SketchUp renders circles to save processing power. It'll be perfect circle when printed. Ill do a proper render as the image was just a screenshot of one of the views in SketchUp.

Posted by Billy Blair (Member # 6068) on June 22, 2018, 09:04 AM:

Slightly updated with smoother edges and hole is standard 5mm.

Download STL 3D File

Posted by Maurice Leakey (Member # 916) on June 22, 2018, 09:39 AM:

Very impressive. What will it be used on?

Posted by Billy Blair (Member # 6068) on June 22, 2018, 10:03 AM:

Mainly if youre building a telecine or a film cleaner perhaps.

Posted by Dominique De Bast (Member # 3798) on June 22, 2018, 10:37 AM:

Good job, Billy ! I was wondering, as Maurice, what you would do with it. Do you have a specific project or were you asked by someone else to manufacture those sprockets ?

Posted by Billy Blair (Member # 6068) on June 23, 2018, 05:33 AM:

quote:
Good job, Billy ! I was wondering, as Maurice, what you would do with it. Do you have a specific project or were you asked by someone else to manufacture those sprockets ?

Its just for personal DIY projects.

I built a telecine using the Bingoscope projector and thought I might need a sprocket to stabilise the film but it seems ok without it.

So decided to make my own version of the Film-o-Clean (as its so expensive!) using some good ol Lego Technics! It will have interchangeable sprockets and 9.5mm is one of them. The sprocket will go onto the top right spindle. If I ever get to 3D print it that is!

Posted by Mark Mander (Member # 340) on June 29, 2018, 05:43 AM:

Looks great Billy,let us know how it performs,Mark

Posted by Stuart Reid (Member # 1460) on July 13, 2018, 09:00 AM:

Seems to me a 3D printed Film-O-Clean would be a really useful tool!

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