Evening
Been thinking about machining up a blank and wondered if anyone had any tips / tricks for machining the barrel port.
I'm planning to use an undersize drill suitable for cross holes then open out , but it got me thinking about how to minimise the burr / how to debur ?
Got a couple of ideas on how to do this but thought I'd ask.
Any tricks that won't risk damage to the lands.
Cheers
Mike
Well for me...
I don't use a drill bit..
I use a sharp EndMill....
This will minimize burrs...
Take your time, Not a lot of down force needed..
Also Peck drill it... Drop the cutter down a small amount and back out...clear the chips
Then for the final check,
I also use a tapered diamond burr in a pin-vise.
To clean up the edges....
(https://photos.imageevent.com/scl_electronics/gun/air/websize/deburring-bit.jpg)
Good Luck,
Stuart
Drop thing down that blocks the barrel up.metal/wood,
Measure the depth needed,
Then u no you got a back up on drilling.
Push pellets through on de-burring to show how your going,
Mark the pellet b4, eg at 12oclock, u slowly push in and look where it is when u push it back out, if any marks on the pellets, 12 o'clock mark will show where a burr is, eg 5 o'clock.
Just push the pellets over the port hole, then back.
Leave a pellet in over the port hole after pushed in more, Then back over the hole, mark the pellet small screwdriver etc,
Then pushed out 100% u see again any trouble.
Watch the English. Lol. Al
Many thanks for the advice , on the endmill / slot drill , have you gone straight to size ? I was thinking about leaving 0.5mm on dia and opening it out with a Final Cut at size.
Also like the idea about plugging the barrel with something 👍
Cheers
Mike
If you are Using a Quality Center-Cutting Endmill...
Take your time, clear the chips as you go...
You don't really need to...
But..It wouldn't Hurt anything if you did!!
Good Luck!!
Stuart
I've only ever done one, drilled it under size, reamed it to size, then used a needle file to finish the edge.