measuring threads
measuring threads
(OP)
I work for a pump maufacturer and we do a lot of threading of shaft , tubing and pipe also some custom component parts.
what is the best way to measure threads so that i know each part will go together smoothly without spending a fortune on thread gages. Also, If i make my own thread gages on a engine lathe what kind of hardening if any do i need to try?
what is the best way to measure threads so that i know each part will go together smoothly without spending a fortune on thread gages. Also, If i make my own thread gages on a engine lathe what kind of hardening if any do i need to try?





RE: measuring threads
RE: measuring threads
RE: measuring threads
I've seen an entire lot of centrifugal compressor casing studs that somehow passed QC with thread root defects. The problem wasn't detected until the shop tried to drive the studs into the lower casing half. Not good.
Making your own gages is asking for trouble. We've all done it, I suppose. At some point you'll need to prove that your gage is correct, calibrate it and maintain records. I think I'd sooner order the gage from a specialist. Maybe I'd take the risk on soft, temporary gaging on a rush order IF I was confident of the part, operator, and had experience with the thread form. But I would get REAL gages in-house ASAP.
RE: measuring threads
Make your own thread gages -> $
Buy thread gages --------------> $$$
Make parts that gage
correctly on your in-house
gages but will not gage on
a certified standard,
don't realize mistake until
customer calls and says
"whole shipment is scrap and
how could you possibly
make all these parts
wrong?" -------------------------> $$$$$$$$$$$$$$$$$
Penny wise and pound foolish I always say......
RE: measuring threads
If you are going to make thread gauges, this should be done with proper inserts, and a rigid accurate machine and checked carefully before each use, just as a hardened and ground gauge would be.
RE: measuring threads
I have seen a lot the supply houses that have refurbished gauges for what I would consider bargain prices. I never looked into the certifications on same but there must be some guarantee of accuracy. I think this could be one approach for your gauge problems.