Rogue_Machinist
Hot Rolled
- Joined
- Jul 26, 2011
- Location
- Oregon, USA
So first things first, GUN DRILLING ISNT AN OPTION, I recently ran a batch of parts. 16 of them. Well only 15 were needed but I always like to have a set up piece. I need to drill a .250 diameter hole 6.9" deep. But the problem im coming across is half of the parts the holes will be relatively straight and straight enough. And the other half have about .020" of runout/deflection. These parts are being peck drilled on a lathe using a cobalt drill 135° in 4140. Is there a way to get them all to run true so the new batch I need to run arent bad? I am currently doing a #3 C.D. then a .250 screw machine to 1" deep then pecking the remaining with the long cobalt drill. Will adding a second jobber length drill help at all?
And lastly would this issue be solved by having these parts drill in a CNC mill be a better option for the runout?
Any and all input is greatly appreciated.
And lastly would this issue be solved by having these parts drill in a CNC mill be a better option for the runout?
Any and all input is greatly appreciated.