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probably plenty of spare time if you are able to come onto the forum and write a post about it?

when is a burr not a burr, if the drawing states it should be free from burrs and sharp edges then it should be.

So, the general limits on 1.00" dimension is +/-.010 I have drawn a quick sketch to show the functionality of the part. It is part of a test fixture and is mounted to a base plate via a mounting block so part of face A is the only face that comes into contact with...

Dave & Chez Datum surfaces B and C are not functional or mating in any way. Datum surface A is the mating face, it is where this block attaches onto another smaller block. The contact area is minimal but I do think I will add the flatness tolerance back into datum surface A

So, I have reviewed my datums with a view to the functionality of the part bearing in mind the outside profile sits in mid air with no functionality at all. I think this looks more sensible for what I need. Thoughts...

mkcski- this forum is a great place for having queastions answered and I dont want to become a pest either, but a great way of learning is by asking people who know. I am a long time reader of this forum. Also, we make these parts in small qtys so while coordinate guessing machine is a...

i am back from a 4 day GD & T course (TEC-Ease). But as you have just said- application and selection of datums is complex and the only way I will learn is by doing examples. Looking at examples that are already done is one thing but applying it to parts that dont have it is a completely...

Confused. I was aiming for location per Fig 4-2 So then, what I need to do to correctly apply this is to move my datum B of the FCF and onto the horizontal line to the left of the 2.540 dimension line. Does this make my SEP REQT call out legal?

Do the 1.00 , 3.155 & 2.540 dimensions not allow the caliper test to be carried out? What am I misunderstanding?

mkcski- with reference to 1.3.32.1 does that not make the 3 datum faces features of size? Also, is the sep reqt call out not legal as per 7.5.4.2? Thanks

mkcski- I'm finished work for the day I will read 7.5.4.1 tomorrow morning and re-evaluate this. AndrewTT- Yes I understand, I have re looked at this and I think I understand the rules around this although I might be back with a question to confirm my understanding tomorrow morning.

Andrew- your right so I have called out datum A. Should I then reference datum C on the M6 holes for the same reason as this is the face on which they are derived? Also, the 3X R.130 basic dim covers the additional rad in the U shaped profile mkcski- both your points are taken on board and...

Hi Andrew & all, For manually measuring threads we in the case of these would use a pin with the same diameter as the minor diameter of the thread and check the position that way or if not manually then CMM I have updated the drawing as follows: -Removed the last of the leading zeros from...

The thing with this part is that it is in full view when in use and aesthetics are important so a non functional deature is probably best to ensure consistency. I guess I could add a rad or chamfer onto one of the top internal corners of the "u" shape profile, this would remove the symmetry.

Hi All, Many thanks for your responses. I think I should have explained what this part actually does and what the critical features on it are. So its a block, the real critical features are the 2x dia .201/.197 holes in section x-x. Two photodetectors are fitted into these and their alignment to...

Hi all, I am a novice with regards to the proper application of GD & T. I have attached a drawing of a simple part I have added it to- where previouly it was dimensioned without it. Can you give me some feedback with regards to the application of the symbols I have used. I am working to ASME...

I am using NX 9 and the same thing happens to me if I add a new base view.

Perfection is all well and good but it doesn't pay the bills. We go to work to make money, we don't go to work to put the world to rights, If as Engineers our advice isn't taken, well at least we have given it and the finger cant be pointed at us when it goes wrong.

Guys thanks for all the input. I will see how I get on and report back shortly.

Thanks for the replys all. btrueblood- this is one idea we have but it is not practical for 100's of the same part I should have mentioned that 1gibson- what do you mean by an orifice? Crimping the tube doesn't look very professional! ornerynorsk- I had looked at slow start valves- have you...