vmipacman
Cast Iron
- Joined
- Nov 21, 2014
- Location
- Virginia, USA
What can you do on parts that are generally lower tolerance (2plcs, +/-.01) that you can't on higher tolerance (3plcs, +/-.003-.005)?
I am thinking in terms of prototype or one-off parts.
-Can I drill a hole on the VMC, then open it up manually a small amount on the drill press and still expect 3 plc positioning? Like if I drill/reamed it .250 to use as a locating feature, but need it to be .270 final.
-Is it (generally) acceptable to drill a hole on the machine, but ream 2nd OP on a drill press? Same with tapped holes?
-If I use a sharp machine length drill, and slow down the first .05", can I omit spot drilling if its a standard 3plc bolt circle?
-Do all small shops worth their salt use a cmm to check 3 place parts?
Thanks!
I am thinking in terms of prototype or one-off parts.
-Can I drill a hole on the VMC, then open it up manually a small amount on the drill press and still expect 3 plc positioning? Like if I drill/reamed it .250 to use as a locating feature, but need it to be .270 final.
-Is it (generally) acceptable to drill a hole on the machine, but ream 2nd OP on a drill press? Same with tapped holes?
-If I use a sharp machine length drill, and slow down the first .05", can I omit spot drilling if its a standard 3plc bolt circle?
-Do all small shops worth their salt use a cmm to check 3 place parts?
Thanks!