Case Study: Reaming a Steering Fork


This manufacturer was reaming a bore on a steering fork made out of case-hardened steel on a horizontal index lathe. The bore diameter was 15-0,027 mm with a pre reaming operation of drilling, prebore Ø14,8mm. The yearly production of this steering fork was 100,000 parts.
Steering fork machined with a Diatool precision reamer
Here was the original process:
The customer was using an expandable monoblock reamer supplied by a competitor, the reamer was carbide tipped with a TiAIN coating and a negative bevel lead. This reamer was achieving tool life of 1500-2000 parts after 3 total reamer expansions.


After reviewing the project, the reaming experts at Monaghan Tooling Group and Diatool worked together to recommend an expandable monoblock reamer with through coolant. The reamer was carbide tipped and ATN coated with a special geometry bevel lead G09K08.
Cutting Data
Diatool monoblock reamer


Tool Life: 12,000 parts and 48,000 bores
Tool Life Improvement: +500%
After working with the Monaghan and Diatool team, this manufacturer was able to achieve over a 500% improvement in tool life.