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bighead

Aquatica Gear pitch

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hi, does anyone know the gear pitch for the aquatica housing, specifically the one for D7000 ?? I am looking for the zoom gear #48717. Looking to use it for some other DIY projects.

Thxs ...

Edited by bighead

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Hi Since I just printed that exact lens, here are the specs.

 

sucks I cant copy and paste on this site.

 

P = 24 Diametral Pitch

N = 88 Number of Teeth

phi = 14.5 deg Pressure angle

a = 1 / P Addendum

b = 2.157 / P - a Dedendum

c = b - a Clearance

dp = N / P Pitch Circle Diameter

db = dp * cos(phi) Base Circle Diameter

 

Let me know if you need anything else I added a few thousands to account for shrinkage in the printing, to the tooth length.

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Okuma - have you used one of those rings in a housing? I'm just wondering about real world gear meshing and housing clearances.

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No I have not used one before.

I found out about them from a presentation at our U/W photo club. The presenter has used them.

Back ground info: I ran a large gear manufacturing company for three years and do have some insight into gearing.

Think about how much pressure you would have to exert to deform a plastic gear tooth and think about how much force is requires to turn a lens ring.

If interested, pm me and I'll put you in touch with the guy who presented at our club.

 

Cheers

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just to check. The diametral pitch is 24, so the metric module if calculated wont be a standard module. Do you size up or down to the nearest standard module ?

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just had it printed out ... module of 1mm works fine with the gear. however, the no of teeth shouldn't be 88. it shld be more and I am working out the number. Based on 88, the gears do not engage each other.

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from my latest print, the no of teeth should be 92, with a module of 1mm. Pretty easy to get this gear off solidworks standard library.

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