Just bought a few Dormer centre drill bits as my box of centre drills are getting very tired. By tired I mean worn. Not having an accurate sharpening method means for small centre drills (~1/8th inch or 3mm) I tend to throw them away and get new ones.
I know that is wasteful and I need to find a way of recycling HSS and carbide tooling. If anybody knows of a good option then please do drop me a line, firstname.lastname@example.org. Also, if anybody has studied the life cycle analysis of HSS and carbide tooling then do also drop me a line. I would really like to know if material cost dominates the LCA or machine energy consumption.
Back to the Dormer centre drill. A 10% offer from ArcEuroTrade dropped into my inbox for anything from their Dormer range of tools. I just had to have a look.
I bought 2 off of each:
- 1/8″ x 3/64″ Dormer A225 HSS 60° BS328 Centre Drill
- 3/16″ x 1/16″ Dormer A225 HSS 60° BS328 Centre Drill
- 4.00 x 1.60mm Dormer A200 HSS Metric 60° Centre Drill
The first size is the diameter of the body of the centre drill, the second size is the diameter of the tip. This is useful to understand as with fine work you sometimes just want to touch the centre on the part to mark it.
The total price for these 6 centre drills was just over £20 with discount. That’s not cheap, but quality is never cheap. If I mess a part up because of poor quality tooling the cost is high. Both money wise and again total impact on the life cycle.
I have now used two sizes of these centres on the Burrell crosshead guide, hence with cast iron. I’m impressed. Very sharp, very accurate and a step change in the old centres in my toolbox.