Nerdlinger
Stainless
- Joined
- Aug 10, 2013
- Location
- Chicago, IL
Hi Everybody! I need to cut a .568” wide slot .895” deep through a block of annealed 4140. The slot is .875” long because that’s how wide the part is. It is rigidly held with serrated pads on a hydraulic vice with ten billion pounds of clamping force. The part is sticking up about 1.2” out of the vice.
Machine is a dual contact Speedio S700.
I am considering three ways to do this.
1. Full slot with 1/2” end mill right down the center, leaving about .034” on each side for a finish pass. (Or maybe a semi-finish pass that leaves .005” on the walls/floor for a real finish pass.). The only thing here is I’m not sure how deep I can go on each pass with 1/2” em on the 30 taper…maybe .375”?
2. Same as above but with a 14.5mm end mill and thusly leave nothing on the walls for a finish pass. Same concern at #1 regarding machine rigidity, though.
3. Same as #1 but with a 3/8” end mill since the Brother might tolerate the smaller cutter a little better. Maybe not right down the center, though…so maybe left side of slot, then right side of slot, then down and repeat.
4. Trochoidal rough with the 3/8” at full depth, leaving .005” on walls/floor for finish pass.
This is for long term production reliability/tool life is important.
Thank you for any thoughts you have on those options or others!
Machine is a dual contact Speedio S700.
I am considering three ways to do this.
1. Full slot with 1/2” end mill right down the center, leaving about .034” on each side for a finish pass. (Or maybe a semi-finish pass that leaves .005” on the walls/floor for a real finish pass.). The only thing here is I’m not sure how deep I can go on each pass with 1/2” em on the 30 taper…maybe .375”?
2. Same as above but with a 14.5mm end mill and thusly leave nothing on the walls for a finish pass. Same concern at #1 regarding machine rigidity, though.
3. Same as #1 but with a 3/8” end mill since the Brother might tolerate the smaller cutter a little better. Maybe not right down the center, though…so maybe left side of slot, then right side of slot, then down and repeat.
4. Trochoidal rough with the 3/8” at full depth, leaving .005” on walls/floor for finish pass.
This is for long term production reliability/tool life is important.
Thank you for any thoughts you have on those options or others!