JGS T Handle Throating Reamer Setup

[M1chaelw]

Good Afternoon Everyone

I’m wondering if someone could give me some advice on a JGS t handle throating reamer setup I recently came by.

I’m wanting to give it a try but want to double check I’m using it in the correct way “will try on a scrap barrel 1st too”


The long ground shaft at the top of the photo screws in to the back of the piloted throating reamer .
The thinner rod below this is just the T handle.


This is the part where I could do with some advice …. I’m assuming the larger coned guide slides on the rod and sits up to the chamber mouth , you then get the reamer to contact the throat and lock this in place .
After that you get the smaller bush, slip that over the rod and butt that up to the back of the larger coned guide with a feeler gauge in between to set the depth to cut ? , lock that up and then undo the lock on the larger coned guide and cut until they both butt up ?

Where I’m doubting myself is if the coned guide is only sitting on the chamber mouth ? Does that seem right or is that asking for concentricity issues.

Also what is the other larger non coned guide for

I’m assuming the smaller cone insert is to use for much smaller cases .

Fingers crossed someone has one of these and can point me in the right direction.

Many thanks

 

[Will Henry]

I've never been wild about the concept of throating by hand. I think you would be better off to simply dial in on the throat, screw an extension onto the reamer, then ream it in the lathe. Having said that, your description of the method of use for this set-up makes sense to me. I just wouldn't do it that way. WH

 

[Keith Hansley in NC]

why don't you call JGS and ask them
ask then to email you the instructions
they are a great company to deal with

 

[DaveTooley]

That sounds right but I have never used that setup. I made my own. Rod guide, a stop to set the required distance and the T- handle. I never cared for the finish I got but it worked as advertised.
Looks like it has a two piece rod guide. One in front/chamber and one in the rear.

 

[L.Sherm]

That sounds right but I have never used that setup. I made my own. Rod guide, a stop to set the required distance and the T- handle. I never cared for the finish I got but it worked as advertised.
Looks like it has a two piece rod guide. One in front/chamber and one in the rear.

Dave when you say rod guide do you mean one that goes in the raceway of the bolt?
I've always thought about that.

 

[DaveTooley]

Yes
Drill, ream, turn between centers to true the OD to the ID. I never thought about making it a two piece system but that would be easier to make. Make the sections long enough that they butt up against each other and act as a single piece. Short collar to act as the stop, set gap with calipers. I never worried about the guide being a bit undersize as the reamer with a bushing will self center in the barrel. Probably some allowance for misalignment of the action bore to the chamber is a good thing.

 

[DaveTooley]

 

[Tucker65]

I've never tried this but I've also heard where some have taken a fired shell from the gun and reamed a hole in the base of the case to use as the reamer guide.

 

[JGS_Jaz]

JGS hasn't sold those kits for many many years, this is the only info we have on file anymore.


T-Handle Throating System
This T-Handle throating system, with the accompanying bushings and pilots, was
made to do a precision job of throating without the aid of power machinery. This system
with bushings, set collar, alignment guides and T-Handle will accommodate all calibers
with the use of our standard throaters. It is an economical way to do your own throating
and achieve accurate results, whether an amateur or a professional.
The 10" T-Handle is a steel rod, centerless ground to a precise size to
accommodate alignment guides and set collars. It has ¼-28 threads in the front and back
enabling you to have a replaceable screw on the front end when the screw is damaged
and a set screw in the rear to lock the T-Handle in place or allow you to remove it.
The cone reducer, breech alignment cone guide, set collar and rear alignment
guide are hardened and ground guides and stops. The cone reducer is a reducing guide
to enable the breech alignment cone guide to be reduced for doing small center fire cases
such as .222 Rem, .223 etc. The breech alignment cone guide is for calibers with a base
diameter larger than .460 and up to .600. This bushing helps to align the T-Handle system
with the breech of the chamber and to assist the set collar in providing you with a definite
stop.

The set collar is used to set length or to make a deeper throating adjustment. A
deeper throating adjustment can be created by sliding the breech alignment cone guide
and set collar into the action until resting against the chamber. Slide the T-handle, with
your throater attached to the T-handle, through the set collar and chamber. Gently turn
the T-handle and feel for the throater to engage the rifling. Pull back with slight turning
pressure until the throater turns clear, so you can feel that the flutes of your throater are
indexed on top of the rifling. Then gently put firm pressure on the breech alignment cone
guide toward the chamber.
Then, for instance, if the person wants to move his throat forward .100, take a
.100 shim and place it between the breech alignment cone guide and the set collar.
Slide the set collar toward the chamber firmly against the shim and breech alignment
cone guide setting the set screw in the collar, then you have created a .100 spacing
between your breech alignment cone guide and the set collar. This will enable you to
throat forward .100 before the breech alignment cone guide and set collar comes in
contact, stopping forward motion.
When throating, turn the throater firmly until the throater is allowed to cut free and
clear. Sometimes when throating long distances, you may feel the need to pull and
clean the throater several times before accomplishing the depth desired. This is
because one should not throat more than approximately 1/16 of an inch forward without
cleaning or blowing free metal particles which may damage the throat area of your
chamber.
Throaters can be supplied with throat tapers, standard to manufacturers’
specifications or to one’s individual taper on request. There is an additional charge for
any taper which is not standard.

 

[L.Sherm]

Are you gonna be selling these kits again?

 

[JGS_Jaz]

Are you gonna be selling these kits again?

Not as far as I know. We do still have the t handles.

 

[WSnyder]

T-Handle Throating System