As always with sets, people are either for or against them!
Sets generally work out cheaper than buying the same tools one at a time but not if the set contains more than a few tools you never use. And some sets contain odd assortments!
The risk of buying a useless tool is unacceptable to the sort of Model Engineer who loves a bargain. (Often a short-armed individual who keeps his wallet padlocked at the bottom of a very deep pocket! i.e. Most of us.) Sets are also avoided by professional engineers because buying too cheap, too expensive or unnecessary is an excellent way of bankrupting a business.
Boils down to:
- buy individual tools IF you already know exactly what you need,
- buy a set IF you don't know exactly what's needed. Exploring a set to find which tools are useful is valuable learning, especially for self-taught machinists.
What you need depends on what you do and your machine. My mini-lathe wasn't stiff enough to part-off, so all parting tools are wasted on it. However, the parting tools that failed on a mini-lathe all work well on my WM280, except I don't use them much because a blade tool mounted in a rear-tool post is almost foolproof. On the mini-lathe, (smaller than a Myford), I mostly used Glanze 6mm RH and Facing cutters, and the LH occasionally.
Picture of insert holders:
On a WM280, which is notch bigger than a Myford:
- RH 10mm fitted with sharp non-ferrous insert, but also used on mild-steel. Used for fine-work in tight spaces.
- Glanze 6mm Facing tool. Much used on mini-lathe, generally too small for WM280
- Glanze 6mm LH. Occasionally used on mini-lathe and WM280 – for fine work,
- Parting Tool, too big for mini-lathe, brilliant on WM280 with rear tool-post/
- Button Tool, rarely used but irreplaceable when needed.
- Triangular boring bar. Much too big for mini-lathe. Not much used on WM280 because I rarely bore large diameter holes.
- Square insert tool for high-speed metal removal. Produces an unpleasant spray of smoking chips. Requires more power, RPM and rigidity than a 1.5kW WM280 is good for. A tri-cornered cutter or chamfering tool from the same set do the same job in a more civilised way.
This image pinched from Warco shows what a range of common inserts do:
Dave