Mitchell Mount Dimensions

[Boyd Hobbs]

I'm trying to build a custom mitchell mount into an aluminum plate. Much like this one:

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

 

 

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.

[Sanjay Sami]

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

 

Took these pics of a hybrid riser.

 

http://www.steadicamforum.com/index.php?showtopic=11961

[Hal Smith]

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

[Dom Jaeger]

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.