Coning Touch Hole Liner

[Hoyt]

After you drill out the liner with 1/16, 5/64ths or whatever size is best...do you folks cone the outside of liner. If so what size bit should I use and how deep should I cone, after I open my White Ligntn liner up to 5/64ths?
This is a .62 smooth bore and it had a 3/4" breech plug and I had to rasp out a groove right at the end where liner went in...am a little concerned about quick ignition.

Thanks for any help.

 

[jrdavis]

In all the reading I've done; the inside is coned not the outside!

 

[Darkhorse]

After drilling your liner shoot your gun and see if the ignition time suits you, if it does then stop there. If not then use a small center drill and just touch the hole enough to put a small cone on the outside, this helps direct fire into the vent hole.
You don't want to cone so deep that the outside cone runs into the inside cone, if you do you will open up your touchhole size a great deal.

 

[fatboy]

What DarkHorse said is good advise. My .54 is done that way just touched a little bit makes a world of diff

 

[Hoyt]

Thanks for the info. men..I read on here in one of the threads where 1/8" bit was used for the coning after the vent liner was opened up to 5/64"..does that sound about right?

 

[Rupe/PA]

Keith from Dixons told me to use a #2 center drill. Just did one on my 20 ga canoe gun and find it works well.

 

[Birddog6]

If you are doing 5/64" vent hole, then use a #2 centerdrill. If a 1/16" is required, then use a #1 centerdrill.

Caution should be used on coning the outside as you want to keep a straight wall between the cones of about .025 to .030

 

[Hoyt]

OK preciate the help..I'll use a no. 2.

 

[Terry Zboril]

Hoyt,

As Elmer Fudd says, "Be Vewwwey Vewwey Careful" in coning the OUTSIDE of the Chamber's Whitelightning Liner.

Jim's liner is coned extra large and extra deep on the INSIDE, with very little touch hole wall left, depending on how deep you set/countersank the liner when installing, and how much you had to file off.

The White Lightning should go off faster than any cap gun without any outside coning, at .062 to .067 diameter.

If you are still having problems, and the touch hole is set at level top of the pan, and you feel you MUST cone, try coning ONLY the UNDERSIDE of T-hole slightly, with a pointed carbide burr, to create a sort of "shelf" on top, and simi-cone on bottom. The flash will go UP, and the shelf will help contain more fire. (This semi-coning also works well with the standard "slotted" liners, especially if you recone the inside of them larger.)

Sorry for the :yakyak: :yakyak:

Regards,
Terry

 

[L.B. Myers]

Hi Terry,

Question for you:

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If you are still having problems, and the touch hole is set at level top of the pan, and you feel you MUST cone, try coning ONLY the UNDERSIDE of T-hole slightly, with a pointed carbide burr, to create a sort of "shelf" on top, and simi-cone on bottom. The flash will go UP, and the shelf will help contain more fire. (This semi-coning also works well with the standard "slotted" liners, especially if you recone the inside of them larger.)

______________________

Are you saying to offest the center starter drill towards the bottom of the touch hole? I just want to make sure that I follow.

Thanks

L.B.

 

[Terry Zboril]

L.B.
I use a a Dremel and "apple seed" (1/4" carbide burr tapered to a point) for this, I only "slightly" cut the bottom of the liner hole and leave the top inner shelf of the outside of liner square.(or level), if that makes sense.

Ain't sure you can to it with a regular center start drill bit.
Mine go BOOM before you can pull the trigger, Almost.

Regards, Terry