Measuring Threads
Measuring Threads
(OP)
We have a situation where we may have to produce a family of parts with variable metric threads depending upon a number of design conditions.
The thread may be large (M60 to in excess of M300) and at this size plug and ring gauges are both cumbersome and expensive.
What alternatives to other people use to not only verify the nominal size and pitch of a thread but also the fit tolerance?
The thread may be large (M60 to in excess of M300) and at this size plug and ring gauges are both cumbersome and expensive.
What alternatives to other people use to not only verify the nominal size and pitch of a thread but also the fit tolerance?





RE: Measuring Threads
http://www.geninsp.com/laserlab
Harold
SW2009 SP4.0 OPW2009 SP2 Win XP Pro 2002 SP3
Dell 690, Xeon 5160 @3.00GHz, 3.25GB RAM
nVidia Quadro FX4600
www.lumenflow.com
RE: Measuring Threads
http://www.johnsongage.com
RE: Measuring Threads
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Measuring Threads
Software For Metalworking
http://closetolerancesoftware.com
RE: Measuring Threads
I also agee with mrainey need to verify the thread geometry
make sure it's the correct included angle, Major dia. & root.
which is easy to do in a optical comparator. directly or by dentist mold. It has happened, where the 3 wire check verified correctly, but the geometry was off, there fore
it would not assemble correctly.
To my experience for large threads ground threads is better than single point from a lathe or mill,
but single cut threads are good to if done by an experience
machinist. so it can be debated.
RE: Measuring Threads
solution to your problem.
Perhaps if you could illustrate the application and constraints eg. accuracy required.
RE: Measuring Threads
The large thread needs to be an 7H6g fit, so that's the level of tolerance we are working to, it's for a pressure vessel where the end is screwed into the shell.
I've also heard of snap gauges.
The optical comparison interests me, developing it a little further, is there a digital method of the same technique? For instance, taking a digital photograph and checking that against a template or series of templates?
RE: Measuring Threads
http://www.colorado-video.com/
We've used the image combiner with good success.
Harold
SW2009 SP4.0 OPW2009 SP2 Win XP Pro 2002 SP3
Dell 690, Xeon 5160 @3.00GHz, 3.25GB RAM
nVidia Quadro FX4600
www.lumenflow.com
RE: Measuring Threads
RE: Measuring Threads
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Measuring Threads
the thread can then be viewed with the overlay on the optical comparator screen.
if the threads measure to the correct 3 wire verification
your as good as gold.
low tech for small quantities.
RE: Measuring Threads
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Measuring Threads
http://www.dynamold.com/dmr.htm
http://www.flexbar.com/inspection_measurement.htm
Your thread sizes are not special.
http://ww