Pewter

May 28, 2017 Nigel 0

The image shows a pewter flywheel on a solenoid engine. The outer surface has a hammered finish. Traditionally pewter is an alloy containing 80% tin and 20% lead. Modern pewter is 85 to 95% tin with [more…]

Parting Aluminium on the Lathe

April 2, 2017 Nigel 0

Parting off aluminium in the lathe can be nerve racking and especially if you’ve got it wrong in the past and either the work piece has come out of the chuck or the tool has [more…]

Machining Cast Iron

March 18, 2017 Nigel 0

There are a number of different grades of cast iron and within these there are a number of different qualities depending a lot on the casting method. Sand castings that are found a lot in [more…]

Cast Iron

March 18, 2017 Nigel 0

Cast iron tends to be brittle, except for malleable cast irons. With its low melting point, good fluidity, castability, excellent machinability and wear resistance, cast irons have become an engineering material with a wide range [more…]

Silver Steel Cutting Speeds

February 5, 2017 Nigel 0

The recommended cutting speed for silver steel is 15 to 25m/min Using this speed I’ve created the following table of cutting speeds: Diameter of material [mm] Spindle speed [rpm] Roughing Spindle speed [rpm] Finishing 3 [more…]

Carbide or Tungsten Carbide

June 25, 2016 Nigel 1

Nowadays tools are often referred to as being made from “carbide” – what they actually mean is Tungsten Carbide. The reason for using Tungsten Carbide is it has some great properties: melting point 2,785–2,830°C hardness of [more…]

Case Hardening Compound

June 7, 2016 Nigel 0

Just bought some case hardening compound from EKP Supplies. I want it for a cylinder that I have machined and would like to try and harden the inner surface. I bought 250g for around £14.00 [more…]