M52 x .75 thread data

[musashi99]

Hello,
I'm looking for the thread data (maj, min pitch) for a M52 x .75. I tried to calculte it but I'm missing one value for the .75.

Thanks!

 

[musashi99]

Sorry, the thread I am asking about is an external M52 x .75 thread. It is a filter thread used in opitcal instruments

 

[Timelord]

What value are you looking for? M52 x .75 is 52mm OD and .75mm pitch. Any other value (i.e. root diameter) can be calculated, knowing that M threads are 60 degree triangles.

Timelord

 

[musashi99]

Yep,
I know what 52mm x .75 means. Trying to do the calculation via the Machinery's handbook. While trying to calculate the min PD the table does not list .75 as an option for 45-90mm basic major. I believe that I can get close or will probably just do it the old fashion way and single point it until the mate fits.

 

[ajack1]

A M52 x 0.75 thread is commonly used in camera lens. That might be a good place to start looking.

 

[bkelsey]

I'm looking at Machinery's Handbook, 25th, in Threads and Threading, Metric Screw Threads, Formulas for M Profile Screw thread Limiting Dimensions. It lists formulas for internal and external threads.

 

[Ken53]

I used to machine these type of threads for optics on cnc lathe
I used to get the data from a smaller but same pitch thread
and just adjust the dia data by simple maths

 

[cogsman1]

Major Diameter ......................... 52.00000
Minor Diameter ......................... 51.07986
Pitch Diameter ......................... 51.51286
Thread angle ........................... 60.00000
Threads Per Inch ....................... 1.33333
Pitch .................................. 0.75000
Flat ................................... 0.09375
Single Depth ........................... 0.46007
Maximum Depth .......................... 0.64952
Helix Angle ............................ 0.26553
Wire size .............................. 0.03125
Measurement over wires ................. 50.95709

 

[Timelord]

1.3333 Threads per inch ? How about threads per mm
It should be 33.8667 threads per inch
Assuming all other dimensions in mm (you didn't say)

 

[musashi99]

Thank You, everyone. Problem solved.