MACHINING A BUSHING ASSEMBLY

[SMCC]

Hello,

Numbers are imperial system.
I would like to know opinions on the best ways to drill/ream 2 press fit wide flanged bushings in an assembly that need to be collinear.
It's controlled by 3 datums and has a composite tolerance block with the second block being .002 .
I believe that equates to about, worst case scenario, max .0014 derivation in both the x and y.
Tolerance of busing ID is .0015 .

What would work best?

A) Jig and ream the assembly
B) CNC the assembly
C) lath/ream the bushing before assembly
D) or something I'm missing; or a combination of the above?

The gap between the bushings is 7 inches on one part and 4 inches on another part.
Thank you

 

[Heaviside1925]

OP,
I was hoping a machinist would hop on and give you their opinion but since not, you'll get mine.
My answer would be:
E) Any of the above depending on the known tolerances of the machines and tooling you are using.
Are you doing the machining?
If not, give the drawings and parts to a machinist and let them do it the way they want. Could you use a CNC? yes, but a machinist may be comfortable with their machines and tools, to meet your tolerances without firing the CNC up because it looks like you are just asking for two holes to be machined.

 

[mfgenggear]

SMCC
Can you please pencil rough drawing.
Have the two bores prior to assembly
Jig ground on a Precision rotary right angle 4 th axixs chuck. After assembly cnc mill bore .
Then proceed with jig grind , same as above
Can hold .0005 true position. Discuss it with a supplier with jig grind capability.