| CVD-Coated Insert Improves Cutting Performance |
[Dec. 6th, 2009|06:54 pm] |
 Walter has unveiled its Silver Tiger as the first in a series of chemical vapour deposition (CVD)-coated indexable inserts that improve cutting in milling, turning and drilling applications. The new inserts will be phased in, beginning with the universal WKP 35S ('S' for Silver) insert for milling cast-iron and steel workpieces. Available from Walter GB of Bromsgrove, Silver Tiger's capability is a result of a new surface treatment that reduces the in-cycle machining stresses of both wet and dry applications, due to its balanced combination of a high level of toughness and maximised hardness.
The result is an insert that will compensate for any brittleness that may develop as a result of the CVD coating process, according to the company. The CVD-Al2O3-grade coating counters any influence from thermal shock that can lead to thermal cracking at the cutting edge and minimise tribochemical wear on the flank face. There are key areas that can lead to premature insert failure. The Silver Tiger designation reflects the insert's two-tone finish of glossy silver on its flank face and black on the rake angle face.
Not only is this colour combination distinctive, but it also provides a practical indication of wear. A recent customer trial on a 42CrMo4 steel forging with the Silver Tiger insert running at 260m/min, a 0.5mm/rev feed and a 3mm depth of cut against the incumbent WK35 grade from Walter recorded a further 70 per cent improvement in tool life. |
|
|
| Interface Boosts Interpolator Performance |
[Nov. 16th, 2007|09:37 am] |
Delta Tau has added an EnDat feature to the ACC51 interpolator boards. These upgraded boards make it easy to connect quadrature encoders to PMAC controllers. EnDat is a bi-directional synchronous digital interface that was developed by Heidenhain to provide fast, reliable data transfer, yet needs only four signal lines between the encoder and the interpolator board.
The subsequent economy of wiring allows EnDat users to achieve significant cost reductions.
Savings of up to 50% have already been reported. The technical advantages of EnDat, combined with the performance of the 4096x interpolator chips used on ACC51 interpolator boards, gives encoder feedback a very high resolution. Importantly for engineers, this in turn leads to greatly enhanced velocity loop stability and much greater static and dynamic stiffness.
Currently the Delta Tau ACC51 boards implement EnDat Version 2.1, which provides power-up only via the serial interface, with subsequent positional information derived from sine/cosine data. In the near future support will be added for the recently released EnDat Version 2.2, which provides a fast serial interface for every servo cycle. |
|
|
![[info]](http://l-stat.livejournal.com/img/userinfo.gif){kind=small}
ditmahawatta's journal