Proper GD&T callout for countersink holes for flat head screws
Proper GD&T callout for countersink holes for flat head screws
(OP)
I am struggling with applying GD&T to #6 flat head screw holes. I've attached the applicable drawing that I'm working on. The mating part has press-fit inserts that the screws thread into. I am looking into using "floating" inserts that allow for +/-0.015", but they are larger and packaging into the design may be an issue. I have the countersink called out RFS, but if I switch to the floating insert can I call it out as MMC?
Is there anything else that I am missing? Thanks!
Here's the link to the currently spec'd insert: ht tp://selec t.pemnet.c om/interac tiveSearch .php?FASTA CT=ISEARCH _PRODUCT2& amp;FPRODU CTID=3409& amp;PAGEID=
Here's the link for the floating inserts that I'm trying to package: http: //www.pemn et.com/fas tening_pro ducts/pdf/ a4data.pdf
Is there anything else that I am missing? Thanks!
Here's the link to the currently spec'd insert: ht
Here's the link for the floating inserts that I'm trying to package: http:





RE: Proper GD&T callout for countersink holes for flat head screws
A countersink centres your screw. MMC does not affect location. I agree with your idea of using floating fasteners.
Usually, I specify holes and positional tolerances on the assumption that fabricators can easily do Ø.010". If I cannot make at least one hole float, as in your case, I specify positional tolerances of Ø.005".
If your part is sheet metal and your holes are coming from a bend, you cannot do any better than ±.015" from the bend. You will have to re-think your design.
RE: Proper GD&T callout for countersink holes for flat head screws
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?