Thread spec for camera lens filter thread

[cmays]

I'm making an adapter to join my camera to my microscope. To connect to the camera, I want the adapter threaded like a lens filter. The thread spec is 52mm X 0.75mm. I have access to a lathe but I can't find anywhere the spec for that thread. I need to know the OD, if it's a 60 degree thread or something else, and what the depth of the thread is. If I get that much I think I can wing it. Thanks in advance!!!
Charley

[pixburghenat]

A microscope thread is usually a modified whitworth thread, 55 degree included angle, 36 (.70mm) threads per inch. It uses a rounded crest and root, not sharp V.

You didn't say what type of camera, but you may need a short extension tube to get the focal length right.


I haven't made any camera mounts for a couple of years and haven't links anymore to any websites. But Google 'C-Mount to microscope' or 'Camera microscope adapter', you should get something. There was one site were the user gave very detailed sizes for focal lengths for different cameras and the adapters to microscopes.

The 27th edition of Machinery's Handbook gives the sizes for different microscopes threads, I have to load it here...I'll post them later.


Pix

[MikeZee]

If you know it's metric thread the rest is easy. General rule of thumb, subtract the pitch from the o.d. this will give you the minor dia. (approx.) Metric always 60 degrees. With this info you have a shot at getting somewhere close.

[juergenwt]

M52 x 0.75
Pitch dia = 51.513
Minor dia (nut) = 51.188
Minor dia (bolt) - 51.080

But like Mike Zee said: Nominal size minus pitch is ok. 52.000 - 0.75 = 51.25 (tap drill size).