Parallel Taper Gage vs pin gages

Elric

Elric

Well-Known Member
Dropped hammer on a set of parallel taper gages. Neat-o retro tech from the past. Just make sure that all the angles are present, because the pairing is limited to certain engagement lengths. Try to slide the angles too far and they won't be stable. I'll be dropping the small bit of info I found [which is really quite enough] on the site that will not be named.

URL available for the souls brave enough to face un-named dangers.
 
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Elric

Elric

Well-Known Member
"Pin gauges are useful for so much more than just measuring cylinder throats"

Don't be bashful, what are these uses?
 
Brad

Brad

Benevolent Overlord and site owner
Staff member
Measuring the width of a slot.
Used as a slave pin when reassembling firearms.
Used as a locating pin on mill.
Placed in a reamed hole then used to indicate part in lathe or on mill.
Measuring the hole for an HP pin on a mould when replacing a missing pin.

This is just what I can think of right now.
 
Ian

Ian

Notorious member
Checking guide rails on a 1911 (slot measurement Brad mentioned).

Checking a hole for roundness (daylight check).

Checking bore size of a firearm.

Using as a dowel when peening metal back into a Wallowed hole.
 
oscarflytyer

oscarflytyer

Well-Known Member
Brad said:
Having a set of pin gauges from .060 to .250 and .251 to .500 I don’t see any reason to change?

Pin gauges are useful for so much more than just measuring cylinder throats.
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based on feedback/reviews/thoughts here, I also bought a set of pins .060-.500. Can't even begin to understand why I didn't do it sooner! Priceless for so much more than guns (although they save you a ton and pay for themselves quick if you are a caster!)
 
Rick

Rick

Moderator
Staff member
smokeywolf said:
Still trying to identify "parallel taper gage". I know "adjustable parallels", "leaf taper gage", what is "parallel taper gage"? Anybody have a pic?
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I was hoping someone would ask that. I've never heard of such a thing but I'm hardly a machinist.
 
Charles Graff

Charles Graff

Moderator Emeritus
I have been using Starrett adjustable machinist hole gages for many years, to measure the inside of various holes, including revolver cylinder throats. I use a good Starrett micrometer to measure the adjusted gage. These gizmos require a little feel to learn to get reliable and very accurate measurements.
 
J

Jabezkin

Member
Charles Graff said:
I have been using Starrett adjustable machinist hole gages for many years, to measure the inside of various holes, including revolver cylinder throats. I use a good Starrett micrometer to measure the adjusted gage. These gizmos require a little feel to learn to get reliable and very accurate measurements.
Click to expand...
And these can find a high or low spot in a bore. Along with seeing if there is a taper. Most holes need a couple of pins to see if there is any taper.
Both help find a problem.
 
J

Jabezkin

Member
And you folks with Starrett Mics........247D......tool most new machinists love on the lathe and borrow from me. You can check for concentric dimensions so easily.
Mitutoyo has one too. Just don’t know the number
 
Ian

Ian

Notorious member
I have tubing and ball micrometers (how else do you measure insert bearings?), didn't know the 247D existed. Also have a four-piece set of ball gauges and they're handy in their own right.
 
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