Solidworks hole depth dimension

[SnowCrash]

When I use the wizard to create a tapped hole I use the callout of oh, say #8-32 tap, .600 deep and SW makes a hole with the cylindrical depth of .600, plus the angled tip extends .041".
When BobCAM creates a tool path for this it has to go .641 deep, which does produce the correct hole. Is this difference because of some engineering standard on hole callout?
Another way to state my question is, why doesn't SW make a hole .600" to the tip of the drill bit?

--
Hardie "Crashj" Johnson
SW 2010 SP 4.0
HP Pavillion Elite HPE
W7 Pro, Nvidia Quaddro FX580

 

[Gupta65]

Because one check the depth from the surface till the cylindrical portion and does not include the angled tip length as that can vary with different drill angles.

Deepak Gupta
SW 2010 SP4.0 & 2011 SP1.0
DriveWorks Pro 7 SP5
Boxer's SolidWorks™ Blog

 

[EEnd]

Most taps do not create full threads out to the very end of the tap. In this case, the extra 0.041" is to allow the tap to be screwed in past 0.600" and create 0.600" of usable threads.

Eric

 

[JMirisola]

Then there's always the designer who wants at hole at x" and figures he has enough material between it and that other hole...until the drill tip just barely punches through.

Jeff Mirisola, CSWP
Design Manager/Senior Designer
M9 Defense
My Blog

 

[SnowCrash]

Gupta sez: Because one check the depth from the surface till the cylindrical portion and does not include the angled tip length as that can vary with different drill angles.

Oh, I agree with that, on inspecting with a plug. What I am dealing with is when anyone drills a hole with CAM or manually, the Z is set from the tip of the drill, so if they use the SW dimension of .600" deep, it is shallow by .041".
Well so what . . .
See you guys next year.
"I'm outa here"

--
Hardie "Crashj" Johnson
SW 2010 SP 4.0
HP Pavillion Elite HPE
W7 Pro, Nvidia Quaddro FX580

 

[rollupswx]

The hole is the cylindrical portion of the feature - the point is an artifact of the tool needed to create the feature.
Any experienced CAM programer (or modern CAM software) should automatically account for the drill point.
As a former machinist (8 years on the shop floor) I recommend that you never bottom tap a hole unless absolutely necessary. (Allow liberal bottom clearance as some the chips will fill up the bottom of the hole causing the tap to seize and break. I suspect that broken taps cause more lost parts than any other operation.)