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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[ctopher]

Section view with the angle from the drill surface, and a view locating the hole with two dims will work.
Don't forget the size of the hole.

Chris
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[KENAT]

I'd add a section view to dimension the angle like Chris says, since one shouldn't dimension to hidden detail assuming ASME Y14.100 compliance.

Also, idealy the 9.2 dimension would be replaced by one from a surface (preferably datum) so shown in either the bottom left view or the proposed sectioned view. The 9.2 dimension is to an edge, which is poor practice, especially if you call up for sharp edges to be removed since it doesn't give a good measurement origin.

General comment, maybe you only put the hidden lines to try and better explain for this question, but the drawing is a bit buzy so I'd drop most if not all the hidden detail on the finished drawing.

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[drawoh]

grunt58,

What feature do you have on your part that you can dimension your hole from?

Projected views and sections both work, but my primary concern would be how the fabricator and inspector are going to fixture your part and measure from your reference features. It may be worth adding a reference feature, depending on the accuracy you want.

JHG

 

[grunt58]

It's not a critical part so +-.010" for 3 place decimals and it's machined in house. I still try to follow standards even though we fabricate most parts in house.

FYI that is not the final drawing and it's on the wrong template just used it as a visual ref. for explaning my question.

I thought the 9.2 dim was not the best way to do it since it was an edge. Im still confused as to what I can do to define the 9.2 dimension.

If I picked a datum surface say the bottom face (see pic) how would I define the hole location?

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[ajack1]

Is the angled hole on the same centre as the side hole?

From a manufacturing point of view that would be a far easier way to pick the part up than from an angled edge. In fact for any angles a tooling hole is often the best way to go or for 3D shapes a notsa ball.

I am sure someone will point out this does not comply with some standard or another.

 

[grunt58]

Yes the side hole is for a set screw. Sorry but Im unsure how you could define the angled hole from the side hole.

Grant
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[ewh]

I would cut a vertical section from the left view and place a vertical and an angular dimension in the section view to locate the hole. This way you don't have to worry about the edge break as you are referencing the bottom surface, not the edge.

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

 

[KENAT]

Look at the link for a very simplified illustration of what I meant. This may or may not be appropriate for your case depending on function and what that feature at one end of the hole is etc.

http://files.engineering.com/getfil...1-4ed0-8cdc-05867eb8913c&file=angled-hole.tif

ajack, I'm not sure I quite follow your suggestion, effectively make the set screw hole a datum which the angled hole is perpendicular to with a given angle?

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[ewh]

Yes, KENAT's example is how I would approach it.

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

 

[ajack1]

Yes that is what I am suggesting Kenat, obviously before the hole is tapped.

If you have one or more angled faces you can tip the part so the working face in horizontal or tip the head on the machine and use the “tooling hole” as a reference point, it does not even have to be inline you can dimension the offset.

In the same way as you use a notsa ball when changing the stylus on a CMM.

 

[grunt58]

THANKS!!

Thought about that way but was unsure if dimensioning the centerline like that would be acceptable. Again we machine in house so I could do what ever but I like to try and maintain stardard drafting practices to keep my skills up.

I'll do it like that and the add a projected view to get the other locating dim. and to add the hole call out.


Thanks again for your help guys. I owe you a beer...

Grant
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[ewh]

Which other locating dimension? Hole is now properly located in the example (provided you dimension to the section line); any additional locating dimensions should be reference or you will be double dimensioning.

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

 

[KENAT]

What's the obsession with projected views? The '6.3' dimension to the hole CL/section line could be shown in the left hand view. No need for a projection just for this.

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[grunt58]

Was thinking I wouldn't dim. the section line. Guess I could. Depends on how "busy" it makes that view. I need to do the hole call out and planned on doing it in the projected view so I figured I'd dim the location also.

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[grunt58]

I feel a projection best defines it but you do make sense. I'll try and see how it looks.

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[ewh]

Making the view look "busy" isn't as important as locating that section line, especially if you are applying dimensions to the section. It is better to locate it explicitly than to infer it is on the hole center.

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

 

[CorBlimeyLimey]

I would use ajack1s 'tooling hole' method.

 

[ewh]

I wouldn't. In this situation, it would be fine for set-up, but does not serve any other function. That hole may require tight locational tolerances, which necessitate that the tooling hole be tightly toleranced and those additional tolerances will have to be inspected; you simplify the machinists job, but make the inspectors job that much more complex. If it were a cast or otherwise complex part, maybe, but not here where there are other simple solutions.

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

 

[KENAT]

It's the old arguement of who do you give priority to in drawing creation/tolerance scheme. I was taught function first, inspection second (usually closely follows function), manufacturing third, however I know this upsets manufacturing minded folks.

When you can find a way to completely satisfy all 3, that's best.

GRUNT, I was thinking the left hand view would look something like this.

http://files.engineering.com/getfil...45d8-89a7-0275faa2577e&file=angled-hole-2.tif

Just because the hole is shown as an ellipse doesnt' fundamentally mean you can't put the dia as a callout in that view. However, your CAD system may not like it, in which case you could spec the diameter in the section view.

However, depending on function what I've put may not be best, ajacks may be better though using a threaded hole as a datum isn't ideal. As ewh says it helps machinist at the expense of inspection. If manufacturing wants to calculate the equivalent dimensions to do it that way it's up to them, so long as it meets drawing requirements. The machinist doesn't have to use the dimensions on the drawing to make the part, the finished article just has to meet them. Obviously it's better when they're the same but this isn't always easy/possible.

KENAT,

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