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Burrell Bearings. (Part 2) and Carbide Tips

 Burrell Bearings. (Part 2) and Carbide Tips




Hello
 I'm fresh back from another holiday, and back in the workshop to continue with the bearings. Also to refamiliarize myself with the shed again. 😏

At this stage its just roughing off loads of the material to get the basic shape of the two shells.  Accurate fitting in the housings will follow then the boring of the holes out for the crankshaft. A temporary silver steel shaft of the correct size will be used to check the alignment and hence mesh of the gears. 
  
Also as this time of the year we are approaching the Midlands Model Engineers exhibition in Warwick, my attention normally turns to a shopping list of part and tools I might need for the winter.   

This leads me into another side feature on tooling and in particular what I use on the lathe.

Tipped Tooling

A tipped tool is any cutting tool in which the cutting edge consists of a separate piece of material that is brazed, welded, or clamped onto a body made of another material. Below is a selection of the tools I use and the tips I have obtained for them.

For me the turning point (pardon the pun) was the time spent grinding up HSS cutters to find that they have then change dimension from centre line, this was the days before I hade the quick change tool post with height adjustment. Or worse still, the surface finish became poor perhaps because the geometry of the tool was not ground correct.

The Tip tool started for me with making my own tool holder from a 16mm square piece of mild steel and screwing an insert in for a test. I was so impressed with the finish cut, as I started buying holders rather than making them, and finally buying tips for all applications.

The most useful general purpose tips I use for finishing applications on any material is a tip coded :-

DCGT 11T304 AK10 
This is a Carbide Inserts for Turning Aluminium Grade AK10 (K10 Uncoated Micro–Grain Carbide – Ground with Polished Surface) Main application – Aluminium, Copper Alloys, Plastics and Abrasive Materials, extended application – finishing Stainless. These work out at about £2 each, £1 /cutting face. This was the tip I started with, and have made some last almost a year of service, occasionally I have had one bust on stainless steel being a bit rough with it. Dragging the tool backwards or even turning past centre line so the work is effectively rotating in the other direction with respect to the tool is another way but generally they are fantastic!

Next month I will outline the other tools I use, especially the diamond impregnated ones and tips I use on very hard cast iron, as this seems an interesting side feature and is relevant to the manufacture of the engine I'm building. 

Until next month stay safe; make swarf; have fun!
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