Helical coil Thread callouts on a drawing
Helical coil Thread callouts on a drawing
(OP)
In NX 7.5 I am trying to dimension a Helical coil thread. I get #10-32. I am told ASME standard says it should be .190-32, but I can't get that to happen Can anyone tell me if ASME does recommends not to use #10-32 thd and what standard that might be? Thanks in advance





RE: Helical coil Thread callouts on a drawing
Helicoil
Look here for thread sizes.
Link
Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion
RE: Helical coil Thread callouts on a drawing
No. 10 (.190)-32 UNF-2A
or
10 (.190)-32 UNF-2A
or
.190-32 UNF-2A"
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Helical coil Thread callouts on a drawing
You want to look at ASME B1.1 section 6 & ASME Y14.6 section 3.2. I have the 2003 & 2001 editions respectively and they don't quite mesh on the issue of if number designations alone are legitimate.
As to tweaking your installation of NX, I don't know. In Solid Edge we had to tweak a 'holes.txt' file which held the information for screw threads etc.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Helical coil Thread callouts on a drawing
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Helical coil Thread callouts on a drawing
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Helical coil Thread callouts on a drawing
I don't know about the standard. I figure that when I call up a tapped hole, the machinist selects a tap, and the inspector selects a thread gauge. In either case, tools are labelled 10-32UNF. The .190 part, however accurate, is not particularly useful.
On my drawings, I call up the helical insert as a part. I have a note on the drawing telling the fabricator to follow the manufacturer's instructions. I don't care what tap they use.
--
JHG
RE: Helical coil Thread callouts on a drawing
Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion
RE: Helical coil Thread callouts on a drawing
RE: Helical coil Thread callouts on a drawing
BEAEROHEAD - we use a form like <#10 (.190)-32 UNF-2B> on our drawings. We could never convince ourselves the "#" is actually an approved drawing symbol but went with it anyway.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Helical coil Thread callouts on a drawing
I prefer 10-32. Adding # or .190 is more info than needed.
A machinist knows a 10-32 is .190-32. I have had machinists come back to me trying to meet a 3 place tolerance on .190-32 (not my dwg).
Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion
RE: Helical coil Thread callouts on a drawing
English numbered screws are based on the formula...
DIA = 0.060 + 0.013×N...
...where N is the screw number. This makes it easy to model numbered screws in SolidWorks or whatever your favourite CAD package is, complete with correct BOM entries.
--
JHG
RE: Helical coil Thread callouts on a drawing
Second, you are trying to "dimension" the interior already-threaded !!! hole of the Heli-coil, NOT the actual drilled hole you need to TAP CORRECTLY for the actual OD of the Heli-Coil to get threaded into.
Third, you are confusing a mere 0.002 difference (0.190 nominal) for threaded hole with the "normal" 3/16 (0.1875) drilled hole for a "standard" nbr 10 -32 tapped hole. (Do you seriously think a 0.002 inch difference on diameters from 0.188 to 0.190 will make a difference inside a tapped hole?)
Most often, heli-coils are used two ways: The first is to provide a specific final thread size for future screws to be threaded into in a thin sheetmetal part that is itself too thin to provide a good working anchor.
The second use is the replace an original threaded hole (10-32 in your case) that has been damaged, rounded out, pulled out, or destroyed during operation and use with a repaired threaded hole that can be used again. In both cases, you drill a LARGER hole per the heli-coil spec's for each size, install the heli-coil into that larger hole with the adapter wrench, then install the 10-32 "named" screw into the interior threaded hole of the heli-coil.
from this pdf file from HeliCoil, read the following about hole sizes, and over-large drilled hole sizes, for Helicoils. Then use ONLY the required drill and tap FROM THE HELI-COIL PART LIST.
http://www.stanleyengineeredfastening.com/sites/ww...
RE: Helical coil Thread callouts on a drawing
No, if you see BEAEROHEAD 29 Jul 14 12:39 post it's clear he's calling it up as a separate part. While I'd tend toward doing an assy or similar with parts list... what the OP is doing isn't necessarily wrong given this ends up as an inseparable assembly.
Not really, OP is just trying to make sure the helical thread size is called out correctly per relevant drawing standard.
Really not sure where you're going here. The mention of .190 is related to the relevant drawing standard saying to use decimal equivalents on thread call outs. Nothing to do with tap drill dia (which doesn't belong on engineering drawing per ASME Y14.5). I'm also confused what a .188 hole would have to do with tapping for a 10-32 thread, seems a little big to me.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Helical coil Thread callouts on a drawing
Are you sure you are discussing helicoils? For thin sheet metal parts, I use PEM nuts. Helical thread inserts are for thread repairs, and for holes in soft metal.
--
JHG
RE: Helical coil Thread callouts on a drawing
Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion
RE: Helical coil Thread callouts on a drawing
"Art without engineering is dreaming; Engineering without art is calculating."
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RE: Helical coil Thread callouts on a drawing
I agree that a PEM nut is a better choice for sheet metal than a Helicoil.
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Helical coil Thread callouts on a drawing
RE: Helical coil Thread callouts on a drawing
Hole callout: TAPPED HOLE FOR 10-32 HELICOIL INSERT, SEE NOTE X. (with BOM balloon)
Note X in the General Notes states, FOR ALL TAPPED HOLES FOR HELICOIL INSERTS, FOLLOW RECOMMENDED MANUFACTURER'S INSTALLATION INSTRUCTIONS
This will cover you.
Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion
RE: Helical coil Thread callouts on a drawing
RE: Helical coil Thread callouts on a drawing
Tunalover
RE: Helical coil Thread callouts on a drawing
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV