The last step in proper rolling is executing and adjusting after first test roll.
Step 1 – Minor Dia. and Pitch Adjustment
Loosen 3 nuts and adjust tool +/-. One witness line is .004”on Minor. Center Pitch.
Step 2- Major Adjustment-
Adjust pre-roll dia to the mean of the Major. .001” change in pre-roll dia. = Major dia. change of .003”
Step 3- Adjust chamfer
Adjust for desired result. Keep chamfer min of .010 under Min Minor. Material will “rollup about 15’. Alternative – cut after rolling.
The fourth step in proper rolling is setup of the Process.
Using sacrifice material- program a .600” length to test roll a .500” long part, Insure the material will not hit faceplate.
Pre-turn for rolling = Mean of the Pitch or .465”
30’ chamfer starting at .010” +0.0 -.020’ under the Min. Minor
Feed rate is Pitch less .001” or a proprietary calculated material dependent amount. Roll on and off at the same federate.
Sync tap (G84) works best. Std Tapping cycles and G34 with M03,04 spindle reverse- no dwell.
SFM- 125 SFM for low carbon steels, 100 SFM for SS and hi-nickel material.
The third step with proper rolling is the Machine Setup. Mount tool and sweep faceplate OD with an indicator – Rolling requires TIR of .005”