Theoben Rapid Forum

Evening all.

When machining a transfer port on a new barrel, what is the best tool to go though with to avoid burrs in the chamber?

If a pellet that is pushed though is damaged, what is the best tool to remove the burrs please?

Thanks

For FAC porting over in the States

Using my Small CNC Mill....
I first use a center-drill to make the initial port and pilot hole
(https://photos.imageevent.com/scl_electronics/gun/swift/websize/Port.jpg)

Then I use with a sharp Carbide End-Mill fully cut and shape the Through Port
(https://photos.imageevent.com/scl_electronics/gun/swift/websize/enlarging%20port.jpg)

Then I follow up with a diamond burr in a pin vise, to remove any speck of burrs.
(https://photos.imageevent.com/scl_electronics/gun/air/websize/deburring-bit.jpg)

(https://photos.imageevent.com/scl_electronics/gun/air/websize/barrelport1.jpg)
(https://photos.imageevent.com/scl_electronics/gun/air/websize/barrelport2.jpg)

Good Luck,
Stuart

its also possible to use drill bits as long as good quality.i start with centre drill then go through in increments..say your wanting a 4mm port hole start at 3mm then 3.5 then finish with 4mm.always best to polish over inside of barrel around the port area with a small modeling file.normaly then finish of with a bronze brush like you get in the cleaning kit.clean barrel then rod a few pellets through before re fitting and check the pellets for any scuffs or nicks.a good pillar drill or Miller will do the job.
KevG

Awesome stuff.

Thanks chaps.