Angular orientation of two hexagonal drive features
Angular orientation of two hexagonal drive features
(OP)
I am joining a hexagonal hub to a shaft with a hexagonal drive feature. These two hexagons need to have an angular misalignment of 10 degrees maximum. What is a good way to specify that according to ASME Y14.5M-1994? An image is attached. Thanks.





RE: Angular orientation of two hexagonal drive features
John Acosta, GDTP S-0731
Engineering Technician
Inventor 2013
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Angular orientation of two hexagonal drive features
RE: Angular orientation of two hexagonal drive features
If you just apply loose profile of surface tolerances relative to the same datum reference frame to both hexes on assembly level drawing, you will probably have to add additional profile tolerances without datum feature references to control form of the hexes tightly. Without this additional profile controls actual form of both hexes could become quite crazy.
RE: Angular orientation of two hexagonal drive features
RE: Angular orientation of two hexagonal drive features
RE: Angular orientation of two hexagonal drive features
RE: Angular orientation of two hexagonal drive features
Just keep in mind that the coplanarity-controlled-by-profile concept controls locational relationship of considered surfaces too. This means that in some extreme cases the actual assembly will meet the requirement of 10deg MAX between the surfaces, but the assembly may be rejected during inspection. Imagine actual part having these two controlled surfaces very close to 10 degrees to each other, but in addition there is a radial misalignment of the hexes due to (for example) certain positional error between hex portion of the shaft on the left and cylindrical portion of the shaft on the right. Assembly meets design intent, but the surfaces won't fit into profile tolerance zone. Do you see my point?
RE: Angular orientation of two hexagonal drive features
John Acosta, GDTP S-0731
Engineering Technician
Inventor 2013
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Angular orientation of two hexagonal drive features