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Mitchell Mount Dimensions


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#1 Boyd Hobbs

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Posted 23 October 2010 - 02:50 AM

I'm trying to build a custom mitchell mount into an aluminum plate. Much like this one:
cinemasupplies_2129_7329054.jpeg
I was looking for the important dimensions. I can't seem to find them anywhere--at least not specific enough to machine with.

I need the:

Insert width & depth
Hole width & depth
Key width

Mount_dimensions.jpg

I'm not sure the hole depth is important, but I'm going to assume it is for now.

Any help would be greatly appreciated.
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#2 Sanjay Sami

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Posted 23 October 2010 - 02:43 PM

Not as specific as you may like, but perhaps something you can begin with.

Took these pics of a hybrid riser.

http://www.steadicam...showtopic=11961
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#3 Hal Smith

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Posted 24 October 2010 - 09:54 AM

Get in touch with O'Connor, they'll have the dimensions and might take pity on you. Another source might be Ron Dexter.
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#4 Dom Jaeger

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Posted 24 October 2010 - 09:47 PM

From measurements I've got:

On an O'Connor with a Mitchell base the doughnut shaped part that protrudes and locates the head is 4 1/8" OD and 3 1/4" ID. It extends almost 15/64" from the base.

On Ronford legs the mount has a lip that goes inside the 3 1/4" diameter. The mount you pictured would locate outside the 4 1/8" OD.

So you need the insert diameter to snugly fit 4 1/8" and be slightly deeper than 15/64", maybe 1/4".

The key is 3/8" wide, centred 3" from the base centre.

The hole size on a Ronford legs Mitchell base is about 2 7/8" diameter and about 1/4" deep. It can vary, as long as the lock-off covers the diameter and the depth allows you to get enough thread turns to lock off securely.
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