Slapstick
Cast Iron
- Joined
- Nov 4, 2004
- Location
- Ontario Canada
we have a rush job that needs machining tonight (friday)... and i've been nominated to do it... however it is p20 and i've never machined p20 before, or anything hardened for that matter.
right now someone else is working on it and i am to take over, however they are just working on picking up locations, and setup... and no doubt i'll have to do most if not all of the machining.
the machining itself is relatively simple work, however tedious.
we have plugged 6 positions on a mould, which are 90 degress 3 axis work. they were welded in. they are on angled faces which need to have the weld machined out of them, as well as machine down the plugs to match the faces.
the faces will probably need to be machined with ball nose cutters 3d work..
the plugs also need a 7mm hole put in them as a "die button" which has to mate with punches in the other half of the mould. we've ordered a carbide 7mm reamer as well as a .010" - .015" carbide drill which is under 7mm (can't recall the exact size off the top of my head).
i do not think we have through spindle coolant. SO.. with the carbide drill, i know with TSC drills you can not peck and the coolant still gets through obviously... but with just a standard carbide drill, do you still not peck?? will the drill not get severely hot if not/weld chips/etc? i'm not sure on the exact depth of the holes, as this is all being thrown at me today (friday afternoon)... the other guy ordered a spot drill... but as is my understanding you do NOT spot with carbide drills or it'll wreck the edges pretty quick, and that carbide drills hold their location without spotting. but since location is critical, perhaps if i just do a SMALL spot, just enough more to guild the middle of the drill, not enough that the edges will cut into the chamfer of the spot drill? then we are following it with the 7mm carbide reamer.
what sort of speeds and feeds can i look at? peck with said drill or no? spot or no? how about the reamer? never ran a carbide reamer before... treat it just like a HSS reamer but the fact that it's carbide allows it to machine hardened peices?
how about the welding, how hard is it to machine? have never machined it before... what sort of speed/feed can i start with as a starting point for my ballnose cutter?
i know Speed and feed is all "estimate" untill in the actual situation... but i need help desperately as to where to even begin, so any suggestions would be great....
ANY Help at all will be greatly appreciated... as i'll be working on this in a few hours... i'm not looking forward to it and don't have a good feeling about it, as i've never done work like this before... the last thing i want to do is break a carbide reamer or drill inside these holes... but also not breka the tooling cutting edges as, you guessed it, we only are getting one of each...
Thank you! I'll be checking back in a couple of hours!
right now someone else is working on it and i am to take over, however they are just working on picking up locations, and setup... and no doubt i'll have to do most if not all of the machining.
the machining itself is relatively simple work, however tedious.
we have plugged 6 positions on a mould, which are 90 degress 3 axis work. they were welded in. they are on angled faces which need to have the weld machined out of them, as well as machine down the plugs to match the faces.
the faces will probably need to be machined with ball nose cutters 3d work..
the plugs also need a 7mm hole put in them as a "die button" which has to mate with punches in the other half of the mould. we've ordered a carbide 7mm reamer as well as a .010" - .015" carbide drill which is under 7mm (can't recall the exact size off the top of my head).
i do not think we have through spindle coolant. SO.. with the carbide drill, i know with TSC drills you can not peck and the coolant still gets through obviously... but with just a standard carbide drill, do you still not peck?? will the drill not get severely hot if not/weld chips/etc? i'm not sure on the exact depth of the holes, as this is all being thrown at me today (friday afternoon)... the other guy ordered a spot drill... but as is my understanding you do NOT spot with carbide drills or it'll wreck the edges pretty quick, and that carbide drills hold their location without spotting. but since location is critical, perhaps if i just do a SMALL spot, just enough more to guild the middle of the drill, not enough that the edges will cut into the chamfer of the spot drill? then we are following it with the 7mm carbide reamer.
what sort of speeds and feeds can i look at? peck with said drill or no? spot or no? how about the reamer? never ran a carbide reamer before... treat it just like a HSS reamer but the fact that it's carbide allows it to machine hardened peices?
how about the welding, how hard is it to machine? have never machined it before... what sort of speed/feed can i start with as a starting point for my ballnose cutter?
i know Speed and feed is all "estimate" untill in the actual situation... but i need help desperately as to where to even begin, so any suggestions would be great....
ANY Help at all will be greatly appreciated... as i'll be working on this in a few hours... i'm not looking forward to it and don't have a good feeling about it, as i've never done work like this before... the last thing i want to do is break a carbide reamer or drill inside these holes... but also not breka the tooling cutting edges as, you guessed it, we only are getting one of each...
Thank you! I'll be checking back in a couple of hours!