GD&T Slot Position
Hi all I'm new to the Elsmar Cove; this is actually my first post.
I realize the title of my thread doesn't really have much to do with MSA perse, but I was unsure which forum fit my question better.
I'm wondering what is meant when a datum feature is called a "6 way" or a "4 way" or even a "2 way" for that matter?
I know slot as a datum probably has something to do with restricting the 6 degrees of freedom of an object in 3D, but I'm not sure exactly how.
I've read ok, skimmed the ASME Y14.
I have also searched the internet for info, https://fukiya.info/slot/how-many-character-slots-eso.html to no avail.
Can someone please provide a link, reference, or explanation to help elucidate my boggled mind?
Thank you in advance, and slot as a datum God a site like this exists!
If you look at your slot as a datum control frame, you will see that the secondary datum 2nd reference datum in on the right side of the feature control frame and tertiary 3rd or last datum referenced are holes.
All measurements are take from the secondary and is called the 4 way locator.
From this datum hole, one could measure up and down plus sideways.
To fixture this datum one would have a cylinder of MMC.
The tertiary datum is only to orient the part.
Measurements do not come from this datum.
This is call a 2 way locator since it is the "stopper" for the part.
To fixture this datum, it would slot as a datum a oblong cylinder with the larger size the MMC size or could be virtual condition size.
Again, it just stops the part from rotating.
I am hoping the MMC M with a circle around it is referenced in both the secondary and tertiary datums in the feature control frame.
Hi all I'm wondering what is meant article source a datum feature is called a "6 way" or a "4 way" slot as a datum even a "2 way" for that matter?
Gyro- Hello Gyro, Welcome to The Cove!
The term 4 way or 2 way locators are not in the ASME Y14.
Hello again Sorry I've not been able to respond till now.
Thanks for your magpul m lok slots Dave.
Does your answer mean that all secondary datums on the feature control frame are 4-way locators, and all tertiary are 2-way?
Stijloor, the terms 4-way and 2-way, etc.
I often see on part prints used at the facility I work in.
They usually point to the B and C datums, respectively.
As an example, a part we manufacture is fixtured in a gauge with A1, A2, and A3 used as 'nets' the primary datumand the B and C datums are used to 'locate' and 'orient' the part correctly.
My misunderstanding revolves around how many degrees of freedom a 4-way datum for example restricts the movement of the part.
My mind wants to say that a 4-way locator restricts movement in 4 slot as a datum of freedom, but as Dave pointed out in his first response, it may actually be restricting 6 degrees of freedom.
So therein lies my confusion.
I appreciate the answers so far, but am hoping for any more clarity.
Gyro- Yes, if the secondary datum is a hole or pin, it will be article source 4 way locator and all dimensions should come from this feature.
The tertiary datum if it is a hole and a 2 way locator or stopper.
It controls the movement of the part side to side or r side and also l side.
Paul Thread starter Similar threads Forum Replies Date 11 Sep 8, 2019 7 Aug 16, 2017 2 Dec 15, 2016 15 Apr 28, 2013 T 3 Feb 20, 2013.
GD&T: What is datum shift?
Lines. - Axes. • The true geometric counterpart of a datum feature... Add slot and tertiary datum to pattern-locating control to provide orientation of the pattern of.
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