A recurring wear problem on D10 and D11 blade lift cylinders provides an unusually clear justification for making a specialized shop tool. Curtis explains that dirt, sand and rocks can work their way between the blade connector and rod eye, eventually damaging the eye, bush, pin and connector surfaces. His description of the joint effectively behaving like a small jaw crusher makes the failure mechanism easy to visualize, while an earlier crude flat-bar modification reportedly working well gives the redesigned protective shield a practical starting point.
The proposed solution is appealingly simple: form a piece of plate into a shield that covers the vulnerable joint and encourages debris to fall away rather than collect around it. Curtis estimates that the plate itself will cost less than $20 once the tooling exists, compared with potentially thousands of dollars to replace damaged components. That comparison gives the machining work a meaningful purpose beyond simply demonstrating how to make a press die, although the claimed long-term savings depend on the shield actually reducing wear under real operating conditions.
Making the two-piece die is where the presentation becomes especially satisfying. Scrap steel is repurposed for both halves, with the bottom die receiving a 90mm bore and 70-degree internal taper before the matching top die is machined. Details such as using a spade drill for the large hole, leaving extra material on the alignment spigot until after cutting the taper, and matching the two halves provide enough explanation to understand the reasoning without turning every machining operation into an extended lesson.
The unidentified material used for the top die also produces an interesting bit of shop-floor detective work. Hard spots initially suggest a hardened or repaired surface, while marks exposed during machining lead Curtis to identify what he believes is laser cladding and conclude that the piece is O2 steel from an old bulldozer pivot shaft. The progression is engaging because the material's history is inferred from what appears during machining rather than simply announced, though those identifications are presented as his conclusions rather than independently established material analysis.
Testing the finished dies in the press provides a useful payoff rather than ending the project as soon as the machining is complete. The plate forms to the intended angle, but pressing it slightly reduces its internal diameter, requiring another machining operation before it fits properly. Including that correction strengthens the project because it shows a small but important consequence of forming the material and demonstrates that successful tooling still requires checking the actual finished component.
There are practical limitations that keep the modification from being presented as effortless. A one-piece shield can only be fitted when the cylinder is disassembled for work such as a rebuild or reseal, while an assembled cylinder would require cutting the shield in half, fitting it around the eye and welding it back together. Curtis also explains why the tooling cost can be spread across future jobs involving multiple customers' D10s and D11s, and plans to have the dies heat-treated for better surface life. The closing collection of failed takes is amusing and gives the otherwise technical presentation some personality, though it is considerably less relevant than the focused engineering work that precedes it.
Pros
- Clearly connects the press-tool project to a specific and potentially costly wear problem on D10 and D11 blade lift cylinder joints.
- Explains the reasoning behind the shield shape, 70-degree taper and die dimensions rather than presenting the machining as a sequence of unexplained operations.
- Repurposing scrap material makes the tooling itself a good example of practical shop problem-solving.
- The press test and subsequent correction of the shield's internal diameter provide useful validation of the manufacturing process.
- Installation limitations, tooling economics and planned heat treatment are addressed rather than ignored once the prototype works.
Cons
- The claimed savings and effectiveness are promising but are not supported here by long-term wear results from the redesigned shield.
- Identification of the top-die material and its previous laser-cladded application is based on observations during machining rather than demonstrated material verification.
- The extended outtake sequence adds personality but contributes little to an otherwise tightly focused technical project.
Turning scrap steel into reusable tooling for a cheap protective component is a strong example of practical engineering driven by a real maintenance problem. The lack of long-term field results means the redesigned shield's durability remains to be demonstrated, but the clear reasoning, successful forming test and attention to installation realities make the project both convincing and useful.
