The old adage is, "Lathes make circles, Mills make squares." A lathe can make a straight cut, but not as well as a mill, and a mill can make a circle, but not as well as a lathe. So which should you get first? You're going to want both, so base your decision either on what you think you will do most often, or alternatively (since you will want both) on the first/best deal you come across. Here are some factors to evaluate / questions you want to ask yourself and know the answer to when selecting the best machines to meet your needs.
Considerations when choosing a Lathe
- What do you intend to make in terms of size and material - determines swing, length and mass of your machine. (You will likely want more than you actually need. But it's also true that you often need more than you think.)
- bore size if doing barrel work or other things with longer pieces you may want to pass through the spindle bore
- Available power - voltage 120, 220, 440, single vs three phase
- 3 phase is great, but you may have to allocate extra for a VFD or RPC
- Physical space available / ability to move machine to desired location (#2000 machines don't go up or down stairs well...)
- desire for new vs used machine (largely determined by your willingness to spend time working on you lathe, rather than spending time doing work on your lathe)
- DRO vs Manual dials - not felt to be as important on a lathe as on a Mill
- RPM - range as well as adjustability of that range (in other words variable speed vs gear / pulley setting fixed speeds) affects finish and materials
- Hp - affects finish and materials you can work with.
- budget (yeah... at least give lip service to it like the rest of us pretend to do.
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Considerations for a Mill
- size of what you intend to make. (refer to first comment on lathe size regarding how much you want vs need)
- rigidity - which is often reflected by weight, but design / machine type also plays a large role. Flexibility affects rigidity too. For example a knee mill with it's ability to both nod and rotate the head is very flexible, but not as rigid as some other designs.
- DRO vis manual - a DRO is generally felt to be much more important on a Mill than a lathe.
- Physical space available, ability to get machine there (as above)
- Manual vs Power feeds
- CNC capability or upgradability
- RPM - range as well as adjustability of that range (in other words variable speed vs gear / pulley setting fixed speeds) affects finish and materials
- Hp - affects finish and materials you can work with.
- budget (yeah... what I said before.)
Leave some room in the budget for tooling. Even basic tooling can run 25-50% the cost of the machine itself, and over the years it is not uncommon to spend as much or more on tooling than you