UNI ISO 4256

[luky]

HI!!
someone can help me??
i'm looking the dimension over pins and venier of an
32 teeth
module 0,5
30 degree pressure angle
full fillet root
thank you very much for patience

 

[israelkk]

This will depend on the gear accuracy and tolerances.

 

[luky]

internal is 5H, external 6H

 

[gearguru]

If you can wait 'till Monday, I can find it for you.
The external is obviously 5h; small letters are used for external feature fits...

 

[luky]

ok Mr. Gearguru i wait for your monday post ..
thank you

 

[gearguru]

luky,
ISO 4256 or UNI ISO 4256 are not related to gears/splines; they are standards for "Liquified Petroleum Gases".
UNI ISO standards are the ISO standards accepted also as the Italian (UNI) standards.

I checked my copy of the standard ISO 4156 1981/AMD.1:1992(E) "Straight cylindrical involute splines - metric module, side fit - generalities and inspection"
for the dimensions over/between pins for your 32 teeth, module 0.5, 30 degrees pressure angle splines.
Here is what I found:

The internal 6H spline: ( ISO 4156, table 140)
Pin Dia: 1 mm
Dimension between pins: 14.369/14.452

The external 5h spline: ( ISO 4156, table 177)
Pin Dia: 1.12 mm
Dimension over pins: 17.873/17.912

As I mentioned, I just looked in the standard, I did not calculate anything.
The standards can be purchased on-line at

http://global.ihs.com,

also in pdf format for immediate download.
I hope I helped little bit!

 

[luky]

Mr. Gearguru
i say thank you very much for the help.
thank you very much indeed