The CMC5000 ironheads were investment cast with the scorelines in the faces from the casting process after which each face was precision computer machined to a condition of flatness within a tolerance of 0.001″. (Even though as Tom and others taught, the scorelines themselves have little to do with spin generation!) In addition, in the mid-1990s there was a bit of a dispute in the golf industry over V- or U-shaped scorelines and which was better for generating more backspin. While investment casting is a very accurate process for repeating specifications and shapes in volume production, the faces of investment cast irons at this time were never perfectly flat.

In the mid-1990s virtually all ironheads were manufactured by investment casting. The Innerdyn irons were also one of the very first irons to be finished in a black oxide impregnation treatment to make the surface finish of the heads black, a type of finish that became popular in the 2010s.įirst set of ironheads with all Milled faces 1995 – Golfsmith CNC5000 Irons Notably, the Innerdyn irons stand as the forerunner to sets of irons made with hybrid type irons and conventional type irons in the same matched set which was first introduced in the early 2000s by several of the large golf companies. Thus the game improvement features of the Innerdyn were offered were they were needed, not where they were not, and kept the total price of the set more affordable than all hollow iron set designs. The Innerdyn recognized that a low and rear-located CG was worthwhile in the longer, less lofted irons, but such a design feature is wasted on the irons where the normal loft increase and length decrease combine to make the iron easy-to-hit. The Innerdyn irons incorporated a combination of hollow body, rear-CG long irons with one-piece, solid body middle and short irons. However, moving the CG further back from the shaft is not necessary in the higher loft irons, where the loft is enough to enable all levels of golfers to easily get the ball up. First Set of Irons to combine hollow and solid body construction within the same set 1991 – Dynacraft Innerdyn Ironsįull sets of two-piece, investment cast hollow body irons brought about greater perimeter weighting and movement of the CG further back from the shaft – both proven game improvement features for middle to higher handicap players.

Dynacraft hybrid golf clubs