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Thread pitch ring gages

GNERGY

I usually have the device that I am threading the end of the barrel for, so I get a nice fit, muzzle brake or can. I want to be able to thread them all the same so I am looking to purchase a couple ring gages. What brand do any of you use, any suggestions.
Just wondering, they are not cheap.
Thanks
Tarey
 
Sounds like you're trying to hit a number. Depending on the application I do when threading to a spec. A thread mic will serve you better than ring gages. You will know exactly where you are, high side or low side, by measuring the pitch diameter. I even measure insert wear by measuring PD.

This has been recommended by several people on this site. The 1" mic will cover up to 1 1/16" threads. The reason is the PD is only about .020" over 1.000"

www.shars.com

0-1" Screw Thread Micrometer

www.shars.com www.shars.com
 
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What Dave said...
Ring gauges will certainly work, but go/no go sets- and a calibrating standard- for each PD needed will set you back quite a bit. I believe they're mostly suited for job shops in a production environment- where parts coming off a line can be quickly checked for conformance to spec and passed on down the line or rejected.
 
I have a couple local stores that wanted me to thread some barrels for them. I was just looking for a way to make them consistant and to spec. so no matter what their customer wants to put on them it fits and is not a loose fit. Does that make sense.
I was thinking a Go thread pitch gauge would be the easiest. Way back when I used to work for Pipe Machine Co and they made all sorts of gauges.
Dave, I will check out that thread mic.
Tarey
 
GNERGY said:
I have a couple local stores that wanted me to thread some barrels for them. I was just looking for a way to make them consistant and to spec. so no matter what their customer wants to put on them it fits and is not a loose fit. Does that make sense.
I was thinking a Go thread pitch gauge would be the easiest. Way back when I used to work for Pipe Machine Co and they made all sorts of gauges.
Dave, I will check out that thread mic.
Tarey
Click to expand...
Go-no go ring and plug gauges are most definitive. I've found them on Ebay frequently.
 
One thing about the mics is that your not stuck with one size..... now if your just turning one size then might be a different story lol. At work I've got around 1K of ring/plug gauges along with set plugs and while they are pretty simple either it goes or not we still get out the mics when we need to figure things out.

Just thinking out loud you might just make some soft gauges from taps? make a few rings and run a tap thru, it would sure be the most reasonable for your pocket! I've got a couple I've made and knock on wood haven't run into any problems.
 
Ring gages are only a secondary method of checking thread pitch, and should never be used solely as a means of measurement. A pitch mic is the first and primary method of thread making. You can still have a bad thread and the no go gage cannot detect it and can tell you all is good when it isn't. A pitch mic is the only way to measure and determine if the minor is in spec. A ring gage can't tell you that, and you can still end up with a loose, sloppy thread even though the no go wont fit. There is a lot more to cutting threads than just cutting the threads deeper until the ring gages fit.
 
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Full profile inserts are another way to achieve consistency with PD.
Turn to the desired OD, threadform and pitch can't be anything but right.

However you do it, make sure you get it in writing- your specs and allowable tolerances.

I always prefer to have the device in hand as well- because more than once (way more) I've had a device that didn't fit properly even though my external threads were perfectly within spec.

As long as the form cutter is the correct profile, there's never a disadvantage to "cut till it fits" in my opinion.
This allows for compensation so a device that is slightly out of spec can still be used.
 
I bought such a gage from BAT to thread for a glued-in
action.

Worked as expected----when the gage would screw onto
the tenon, so would the action.

This is a pretty good crutch----but not a measurement device.

A. Weldy
 
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