| 1. | Are Wiper inserts ISO/ANSI standards? |
 | Answer: Yes, all CNMG, CCMT and WNMG inserts fall within the limits of the ISO/ANSI classification. There are no programming changes required. DNMX, TNMX, DCMX, TCMX, TCGX inserts are not ISO standard inserts and have a slight modification to the nose radius that requires tool compensation. See pages 50-52. |
| 2. | How much added tool pressure will occur with a Wiper insert? |
| Answer: Approximately 5-10% increase in radial cutting forces. However axial and tangential cutting forces are equal to conventional inserts. This can cause problems with thin walled components or long shaft work. A common remedy would be to convert to a WF geometry or drop down to a smaller nose radius. |
| 3. | Can a Wiper insert be used for a taper cut? |
| Answer: Wipers have a limited application in taper cuts. It is important to keep the Wiper radii engaged in the material when turning. The greater the taper angle, the less opportunity for insert contact. We recommend no more than a 5° taper. That does not mean you can't use Wiper inserts to cut a taper. It means you will not get the benefit of the Wiper action on the taper. |
| 4. | How much improvement to the finish can I get with a Wiper? |
| Answer: Most literature will indicate two-times better finish with a Wiper over a standard insert. This is actually a conservative number, but is a good starting point. Remember, you can attain a better finish with a CNMG 12 04 04 Wiper than a CNMG 12 04 08 standard insert. Utilizing a CoroTurn 107 insert (positive insert) will improve the surface finish even more and reduce cutting forces. |
| 5. | What type of tool holders should I use? |
| Answer: Rigid Clamp holders should be your first choice, using T-Max P wiper inserts. With the accuracy and repeatability of the RC system, this combination is a winner. By using CoroTurn107 wiper inserts the CoroTurn screw clamping ensures stability and an unobstructed chip flow. |
| 6. | What is the best entering angle to use? |
| Answer: It is important to keep contact with the wiper radius and the workpiece. Use of the proper toolholder is critical. C-style and W-style inserts should be used with a 95° entering angle tool. D-style inserts with a 93° entering angle tool. T-style inserts can be held with either a 91° or 93° entering angle tool. The TCGX inserts should be held with a 91° entering angle tool. The TCGX inserts can also be used in fine boring tools using a 92° entering angle. |
| 7. | Will there be a decrease in tool life with a Wiper insert? |
| Answer: No. In fact, you should achieve increased tool life. The main cutting edge in a standard turning operation does the majority of the work and handles the cutting forces, tool pressure and heat. The same principle applies with the Wiper insert, but the Wiper radii, which is responsible for the finish, is a protected edge, which should increase tool life. |
| 8. | How will chip control be affected? |
| Answer: Chip control for a WF geometry is similar to the QF/PF geometries. The WM geometry is similar to the PR geometry. The best way to eliminate long swarf is to increase feed rate. With Wiper inserts, you can do this without compromising the surface finish. |
| 9. | Can a Wiper insert be used for internal operations? |
| Answer: Yes, there are no limitations to the utilisation of Wiper inserts. As previously mentioned, the Wiper insert will add tool pressure. You may attain additional chatter in thin-walled components or applications where the boring bar is extended past normal limitations. The positive CoroTurn Wiper inserts will reduce cutting forces and eliminate vibration. |
| 10. | Is there an effective Wiper on the 100 degree corner of a CNMG insert? What is the benefit? |
| Answer: Yes, the 100° does have a Wiper. You can achieve better finish in roughing operations using the 100° corner. |
| 11. | Will the Wiper attain better finish in facing operations? |
| Answer: Yes, but it is important to apply a Wiper only when feeding towards the centre of the part, to achive good chip control. A backface operation will also engage the Wiper effect, but limit the chip control. |
| 12. | Can I backturn with a Wiper insert? |
| Answer: Yes, but it's important that correct entering angle is applied. |
| 13. | What wiper insert generates the lowest cutting forces? |
| Answer: The CoroTurn Knife-edge Wiper, WK with an open, positive and sharp chipbreaker generates the lowest cutting forces, which is ideal for avoiding vibrations. |