Inline Bores
Inline Bores
(OP)
I'm updating a 50 year old part/drawing and making a few changes. As I make the new drawing I would like to get it closer to today's standards.
I always struggle with the concept of inline holes and the best way to tolerence them.
This part has 2 bores that are to be held to .0005" dia. The bores are inline and 9 7/8" apart.
I've used a positional tolerance on the bottom hole and a total runout for the upper hole relative to the bottom hole. I've left the limit dimension to drive the form or the holes.
A single shaft will go between the holes and the lower portion of the part will contain gears to drive the shaft.
I've been doing machine drawings for 25 years but GD&T is fairly new to me. I've only used it on a dozen or so complex parts.
Will this get me what I'm looking for? Have I properly applies the correct symbols?
I always struggle with the concept of inline holes and the best way to tolerence them.
This part has 2 bores that are to be held to .0005" dia. The bores are inline and 9 7/8" apart.
I've used a positional tolerance on the bottom hole and a total runout for the upper hole relative to the bottom hole. I've left the limit dimension to drive the form or the holes.
A single shaft will go between the holes and the lower portion of the part will contain gears to drive the shaft.
I've been doing machine drawings for 25 years but GD&T is fairly new to me. I've only used it on a dozen or so complex parts.
Will this get me what I'm looking for? Have I properly applies the correct symbols?





RE: Inline Bores
RE: Inline Bores
Chris
SolidWorks 10 SP4.0
ctopher's home
SolidWorks Legion
RE: Inline Bores
Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services
www.infotechpr.net
RE: Inline Bores
Here is another method that can be used:
Please take a look at fig. 5-53 of Y14.5M-1994 standard. Personally I like this one (especially when location of holes relative to datum reference frame is not so important as their coaxiality), but a lot of GD&T users freak out when they see positional tolerance without any datum reference frame, so this might look weird and incorrect at first glance.
RE: Inline Bores
Evan Janeshewski
Axymetrix Quality Engineering Inc.
www.axymetrix.ca
RE: Inline Bores
I have a the following text book.
Geometric Dimensioning and Tolerancing
Application, Analysis & Measurement
per ASME T14.5-2009
James D Meadows
ASME Press