What are these reamers for?????

[LKeithR]

I think they're probably valve-guide reamers of some sort. Although that pilot is exceptionally long I've seen
and used lots of valve-guide reamers that were configured exactly like those the OP showed.

[BCRider]

Joel, barrel liners would require a larger size to allow for the OD of the liner and not the bullet bore. But you're right. I've got a liner and drill for re-lining an old 22 so I can keep the barrel markings intact. The liner needs a 5/16 hole which I have the drill with pilot for doing on hand. Still need to get "a round tuit" on that one....

The throttle bushing reaming makes a LOT more sense.

[John MacArthur]

What are their large and small diameters? Might give a clue.
Johnny

[rickyb]

A friend dropped these reamers off said they were in his fathers things, he had a gun shop many years ago,
I neglected to add sizes ..371, .3695, .343, .312, .250

These look exactly like miniature versions of the in-line reamers used to ream bushings in heavy truck spindles. The pilot is smaller than the reamer diameter and is long enough to pass through the first bushing and then pilot in the second bushing as the reamer enters the first bushing. The diameter behind the reamers is the exact diameter of the reamer and pilots in the newly reamed bushing while the reamer cuts the second bushing.

measure the diameters and you will know if it is this type.

[Illinoyance]

I am going to vote for throttle shaft reamers.

[Richard P Wilson]

So is the lead end pilot slightly smaller dia then the flutes, and the tailend 'pilot the same dia as the flutes? if so, I'd go for throttle shaft reamers a well. Are the reamers all the same dia, or are they different?

[JRouche]

I am going to vote for throttle shaft reamers.

Yeah, me also. But? Whats the taper about?

As Ill pointed out, there is a taper, I see.

The links you are talking about do not want any deviation or taper at all. Throt linkage? Tapers? No thanks.

All the throttle links I have wotked on were through holes/ Maybe something new comin down the pipe line.

I like the idea, its a no go. JR

PS. I did see a car with a "ball" linkage that did use a tapered rod to work with the ball and joint, It never ever worked right, The Italians... Nope, this was a British car. Close enough in my opinion, ''

Actuallaly, the Brits didnt make some of the worst. The French have them beat!! JR

[andywander]

Yeah, me also. But? Whats the taper about?

As Ill pointed out, there is a taper, I see.

The links you are talking about do not want any deviation or taper at all. Throt linkage? Tapers? No thanks.

All the throttle links I have wotked on were through holes/ Maybe something new comin down the pipe line.

I like the idea, its a no go. JR

PS. I did see a car with a "ball" linkage that did use a tapered rod to work with the ball and joint, It never ever worked right, The Italians... Nope, this was a British car. Close enough in my opinion, ''

Actuallaly, the Brits didnt make some of the worst. The French have them beat!! JR

I don't see a taper in the photo, but you may be right that there is one.

But that doesn't rule it out for making un-tapered holes; you'd just have to pass it completely through the set of bushings.

[Richard P Wilson]

Is the taper (if any) just the taper that you'd get on the first inch or so of any normal hand reamer?

[JRouche]

Yeah. Taper reamers are some thing I have and cant use..

They are supposed to be at a certain depth. Then drwan back. Then a finer taper of the same size to go back in an de-burr it..

Think of a blind hole when drilling.. I always thought taper reamers were of a certqain, very determind depth. Otherwise you will snap the reamer, gaurenteed. Done it, many times.

You go passed your diameter you you croak the reamer. JR

[Richard P Wilson]

Clumsy bugger! ( the late Sir John)

[nickel-city-fab]

If you ever get the chance to ream some carburetor shaft bushings, you will see the reason immediately. The bushings are separated by at least an inch, and maybe as much as 2 or 3 inches.

Yeah, but judging by the size of the paper towel they are setting on, that would have to be one gigantic carb -- and I've done both holleys and q-jets. Seeing something else in the picture, for scale, would help. I do think the smaller reamers shown later could have been used on carbs, but not enough pilot on those.

[nickel-city-fab]

Actuallaly, the Brits didnt make some of the worst. The French have them beat!! JR

Fond memories of trying to help a friends teenage son with his 1983 Renault nad zero budget, while living out in the corn.

[andywander]

Yeah, but judging by the size of the paper towel they are setting on, that would have to be one gigantic carb -- and I've done both holleys and q-jets. Seeing something else in the picture, for scale, would help. I do think the smaller reamers shown later could have been used on carbs, but not enough pilot on those.

They are all less than 3/8" diameter, so not really that big.

[A.K. Boomer]

They are all less than 4/8" diameter, so not really that big.

Exactly - little smaller than 8/16" and just a scosh over 2/4ths