Projected Tolerance : Manufacturing Capabality.

[Madhu454]

Hi All,

Attached a bushing drawing created as per ISO GPS standards. Many Dimensions are removed intensionally to obay comaney IP policy.

Assembly works this way, the M30 Stay bolts will passthrough the center hole of the bushing and engages with the thread.

Drawing callouts for a coaxiality tolerance for M30 threads, The thread axis should be coaxial upto a projected length of 230mm in the shown dirction. The coaxiality tolerance is 0.1 mm.

Whether the stated tolarenace is difficult to acheive? How to make sure while manufacturing, the thread concentricity is maintained for such a long projected height. does it demands for expensive tooling.

I beleive it can be verified only with the help of CMM.

 

[MechNorth]

Try this source for a gauge pin:

http://www.trueprecisioncorp.com

Jim Sykes, P.Eng, GDTP-S
Profile Services

http://www.profileservices.ca

TecEase, Inc.

http://www.tec-ease.com

 

[fsincox]

Interesting part, Your choice of datums has robbed you of the use of MMC on the clearance portion datum "A" and the (relief?) area adjacent to it, it seems to me. I do not know the function so that puts me at a great disadvantage. What is the grooving for? How about the tapers?
Frank

 

[dingy2]

Madhu454:

I think you are asking the wrong people the question of manufacturing capability. Why not ask your manufacturing and quality personnel in your plant?

Dave D.

http://www.qmsi.ca

 

[bxbzq]

Is ISO so different from ASME that allows LMC for concentricity?

 

[pmarc]

Oh, yes it is. Per ISO it is absolutely legal to use (L) modifier on concetricity callout.

There were at least couple of threads on this forum focusing on the difference between ASME and ISO in this area. In the most recent one we were mainly talking about symmetry vs. position interpretation for ISO and ASME. But I think you can quite easily transfer this concept to concentricity/coaxiality vs. position too.

http://eng-tips.com/viewthread.cfm?qid=318283