angle hole

[grunt58]

I know this is drafting 101 but I haven't done one in awhile and I'm having a brain fart today.

I have a angled hole which I need to dimension. What is the best practice? Should do a projected view? Will this allow the machinist to find his edges. How would I dimension the angle? Should I do a section view and dimension to a quadrant? A section would allow me to dimension the angle. Maybe a combo of both?




Grant
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[ajack1]

I guess that is where we differ Kenat. Coming from a manufacturing/ tooling background I would choose function then manufacturing then inspection.

The “logic” behind this is all parts are manufactured but usually only a percentage are inspected in production or in the case of much tooling/ moulding only the end product is usually inspected not the parts that make the tool/mould.

I am not saying that is right or wrong, just the way I think.

 

[KENAT]

Funny, I had the same thought as I was typing. With the increased amount of sampling/certified operators etc. rather than 100% inspection I was wondering if the the priorites of inspection & manufacturing should swap, at least sometimes.

However, at least we both agree on function first! Without fully understanding the function of the OP's part it's difficult to say which of our approaches is best, or maybe there's another way that better captures function.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

http://eng-tips.com/market.cfm?

What is Engineering anyway: faq1088-1484

 

[PeterStock]

Attached would be my approach to the problem. The reference dimensions shown would be an aid to inspection and manufacturing it they wanted them.

Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services
www.infotechpr.net

 

[KENAT]

One concern I have over using the 'set screw hole' in the side as a datum is based on function. While it's not clear, I perceived that the set screw is maybe used to lock whatever shaft goes into the angled hole. As such, functionally it's alingment is probably not that critical and secondly the "set screw hole" could be looked at as depending on the angled hole for location. Setting the setscrew hole as datum implies the opposite.

This is whey I kept bringing up the function question.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

http://eng-tips.com/market.cfm?

What is Engineering anyway: faq1088-1484

 

[PeterStock]

Kenat;

You are right about the function. I would need to know how the part is assembled and used to be sure what approach I would you. I made some assumptions in making my example.

Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services

http://www.infotechpr.net

 

[ModulusCT]

You can connect the base view and the auxiliary view with the centerline of the hole (originating from the aux view I suppose) and dimension the angle of the centerline to the base of your part in the base view.

I believe you can place the one of the locating dimensions at the intersection of that CL and the left edge of the part in the base view.

The X dimension is easily taken from the left or right edge visible in your auxiliary view. The hold size is also taken from the auxiliary view.

That's how I might approach this anyway. It should show the inspector and machinist how to set up the part as well.

 

[ewh]

I'm not sure about that... seems like dimensioning to hidden features somehow.


"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]

 

[ModulusCT]

Well technically, you're taking the dimension from the intersection of the CL and the verticle edge of the part.

That's how I've saw it done a few years back while working for UTC.

I agree that dimensioning to hidden lines is a no-no.

 

[steven162]

Peter Stock,

Your pdf is wrong, D should be part of the TP tolerance of the 4.5 hole, top middle of drawing.

I would box the 14.633 dimension, put a boxed dimension to the hole from A on the left hand view and put ABC on the 4.5 dimension, middle top view

Steve

 

[PeterStock]

My pdf is wrong but the intent is that the 4.5 dia hole is located from the M6 hole. The True Position of the 4.5 dia hole should be to A|D(M)

Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services

http://www.infotechpr.net