Mini Jet problem

[Codesman]

I have a jet mini lathe variable speed. when I am drilling brass I use a Talon chuck and drill chuck on the tail stock. The tail stock seems to have a lot of movemtment the MT is tight but the movement can be reduced if i tighten the set screw. this makes it dificult to advance the drill bit. Does anyone have any sugestions?

Thanks

Shawn & Josh

 

[Skye]

I know the slop you're talking about and luckily I don't have much of it yet. I normally also grab the JC with my hand and hold it in place and try to keep it from wiggling around.

I know you can probably reduce a little of your problem by using as short a drill bit as possible.

Oh, and also make sure to drill the brass in a series of drill bits. It'll help keep it centered.

 

[jskeen]

Don't know if you are doing it this way or not, but drill through the web in the base of the case and out through the primer pocket FROM THE INSIDE, IE, slide the drill bit in through the neck of the cartridge and then drill out the back. Reason is that the flash hole that the flame from the primer enters the casing from is an integral part of the casing and is usually dead centered, which helps center the bit. If you try to drill into the spent primer from the back, the dent from the firing pen is usually off center and the primer itself is slightly domed, and not always level. this makes it difficult for the drill to start it's cut centered.

If you are using a drill bit larger than the ID of the casing mouth, try to find a way to remove the spent primer, then drill from the back. Not as good as from the inside, but better than trying to start the drill on the primer itself.

 

[stevers]

Don't know if you are doing it this way or not, but drill through the web in the base of the case and out through the primer pocket FROM THE INSIDE, IE, slide the drill bit in through the neck of the cartridge and then drill out the back. Reason is that the flash hole that the flame from the primer enters the casing from is an integral part of the casing and is usually dead centered, which helps center the bit. If you try to drill into the spent primer from the back, the dent from the firing pen is usually off center and the primer itself is slightly domed, and not always level. this makes it difficult for the drill to start it's cut centered.

If you are using a drill bit larger than the ID of the casing mouth, try to find a way to remove the spent primer, then drill from the back. Not as good as from the inside, but better than trying to start the drill on the primer itself.

That is an awesome idea. I'm going to try that next time I drill one. Thanks.