Wondering why

[Anonymous]

Hi guys and perhaps some girls,
As long as I work with Inventor (since release 4) I asked myself why is it
that hole depts are not beeing calculated from the point of the drill
On a drilling machine the hole dept is always beeing calculated from the
point of the drill (Z -2mm) now I have to calculated first the drills angle
and then give the dept. Am I the only one that makes a problem out of this
???, or is it something for the wishlist

Greetings Cor

[albender]

The hole depth refers to the depth of the diameter of the drill.
1/2" hole 1" deep = the 1/2" diameter being 1" deep, not the point. This is common knowledge.

[Anonymous]

Common Knowledge or not; I cant expect from the operator that he takes his
calculator to find out how deep he has to drill. so I have to give the
holedept from the surface to the drills point in the drawing

greetings Cor

schreef in bericht news:5659811@discussion.autodesk.com...
The hole depth refers to the depth of the diameter of the drill.
1/2" hole 1" deep = the 1/2" diameter being 1" deep, not the point. This is
common knowledge.

[Anonymous]

Cor,

My machine tools (Mazak) will automatically add to the programmed depth of a
drilled hole to make up for the point.

Normally, the depth of the body is what I am concerned with, not the tip
depth.

I could see in some instances such as maybe a manifold or such where you are
concerned about not breaking into another cavity; an option to select tip
depth would be nice.

It's a personal preference. I wouldn't be as obtuse as to say it is "common
knowledge"

Denis

[Anonymous]

I have a very thick skin 😉
And I never pretend to know everything, even common knowledge

Greetings Cor


"Denis Schoemaker" schreef in bericht
news:5659820@discussion.autodesk.com...
Cor,

My machine tools (Mazak) will automatically add to the programmed depth of a
drilled hole to make up for the point.

Normally, the depth of the body is what I am concerned with, not the tip
depth.

I could see in some instances such as maybe a manifold or such where you are
concerned about not breaking into another cavity; an option to select tip
depth would be nice.

It's a personal preference. I wouldn't be as obtuse as to say it is "common
knowledge"

Denis

[martiste]

When I was working as a drill operator, I would mark the start of the hole, once my bit had started cutting a full diameter, not when the drill bit would start touching the material surface. I the hole depth has to be located very accurately, then you shouldn't be using a drill bit, you should do that on a milling machine.

[albender]

I worked in the tool shop for 13 years and all prints always gave the depth of the drill diameter. Besides before you use the drill bit you need to center drill the location to keep the drill from walking off the location. Now your drill point will not touch the surface of the material being drilled. If you were offended by my answer I am sorry. But this is standard practice in any shop or engineering office I have ever dealt with.

[kstate92]

We've (almost) always measured to the bottom of the diameter, not the point. Plus: when inspecting a drilled hole, how can one easily measure the point depth? Using what? And how can one be certain the drill point angle will be an unchanging constant? About five years ago, we (rather, Production) switched from 118 degree drill points to 135 due to advances in coolants, coatings, and even styles (insert versus twist). To me, the diameter depth is required by the function of the part; the drill point is merely the consequence of the constantly evolving production process.

[JDMather]

>If you were offended by my answer I am sorry

I don't think he took offense at your point (pun intended). I think he was saying that a drilled hole is generally not close tolerance - if a close tolerance on the diameter depth is required use an endmill (of course I have run into many engineers who don't know that a standard end mill is angled in from the outer edge to the center such that the bottom is actually slightly conic rather than planar - I've see that cause lots of confusion in inspection, especially on large diameter counterbored holes).
CAM software will take into account the drill point automatically without calculations when generating the CNC code. I remember many times back in the day when g-code was typed line-by-line the programmer might forget the point usually when rapid traveling from point to point leaving a scratch across the part. As for the manual operator - if he can't do the calculations hire someone else.
JD Mather
Certified Journeyman Machinist
8 yrs on the shop floor

[Anonymous]

Ok Boys you all convinced me, but I liked the discussion, and no I am not or
am feeling not offended

greetings Cor


schreef in bericht news:5660557@discussion.autodesk.com...
We've (almost) always measured to the bottom of the diameter, not the point.
Plus: when inspecting a drilled hole, how can one easily measure the point
depth? Using what? And how can one be certain the drill point angle will be
an unchanging constant? About five years ago, we (rather, Production)
switched from 118 degree drill points to 135 due to advances in coolants,
coatings, and even styles (insert versus twist). To me, the diameter depth
is required by the function of the part; the drill point is merely the
consequence of the constantly evolving production process.

[Anonymous]

Can we talk about keyway depth on a shaft now?? (vbg)

QBZ




"Cor de Vlaming" wrote in message
news:5661172@discussion.autodesk.com...

Ok Boys you all convinced me, but I liked the discussion, and no I am not or
am feeling not offended

[Anonymous]

Oh that's almost as contentious as "tastes great" vs. "less filling"

--
Sean Dotson, PE
RND Automation & Engineering
www.RNDautomation.com
www.mcadforums.com


"Quinn Zander" wrote in message
news:5661289@discussion.autodesk.com...
Can we talk about keyway depth on a shaft now?? (vbg)

QBZ