04-25-2014, 11:43 AM
Ed, So far so good 
The right hand side of the drawing perfect.
Just have to sort the left hand side a little.
If I add up all the dimensions 5.555+1.94+.5+8.59+.3 = 16.885. The overall length is given as 16.894. I know it is only .009" difference but "correctly" they should be the same.
Now you are "saying" you want the overall length to be 16.894 +/- .005 because it is a dimension with 3 decimal places. If it is critical that the overall length needs to be that accurate, then it does.
Nevertheless the dimensions need to add up correctly, and what I would do is leave the 'clearance area for threading' with no linear dimension. The machinist will sort that out.
Or add the 8.59 dimension to the .50 dimension to give 9.09 and dimension it from the step to it's end point. Again leaving the 'clearance area for threading' actual length up to the machinist. You are not giving the machinist carte blanche it will still come out .50 +/- .02. because it is tied to the other dimensions and the overall length.
DaveH
The right hand side of the drawing perfect.
Just have to sort the left hand side a little.
If I add up all the dimensions 5.555+1.94+.5+8.59+.3 = 16.885. The overall length is given as 16.894. I know it is only .009" difference but "correctly" they should be the same.
Now you are "saying" you want the overall length to be 16.894 +/- .005 because it is a dimension with 3 decimal places. If it is critical that the overall length needs to be that accurate, then it does.
Nevertheless the dimensions need to add up correctly, and what I would do is leave the 'clearance area for threading' with no linear dimension. The machinist will sort that out.
Or add the 8.59 dimension to the .50 dimension to give 9.09 and dimension it from the step to it's end point. Again leaving the 'clearance area for threading' actual length up to the machinist. You are not giving the machinist carte blanche it will still come out .50 +/- .02. because it is tied to the other dimensions and the overall length.
DaveH