Buying used CNC and tech support
I think that the dealer or manufacturer will likely support you. The support will not likely be free.
Machines of certain ages will be easier or harder to get parts for, and controls may or may not be current or supportable. This is especially true with a dealer that may not have always carried the product and may not have long term technical capabilities (for older units).
While a dealer or manufacturer may have made a profit on the original sale, if ongoing support is included in the initial deal, the manufacturer is not likely going to walk another company through the learning curve without suitable payment (service contract, hourly rate, etc.).
You need to decide if the value you are getting is going to offset the potential additional costs the current owner does not have (or is not willing to spend for), and how this stacks up against the price of new/current technology.
A good bit of my business is helping companies find appropriate CNC equipment and integrate that equipment into their production environment. The quality of maintenance support that I get from the distributors and manufacturers is similar to the support that you would expect if you were the original owner of a machine of similar age. The distributors and manufacturers want you to be happy with the used machine because they know that successful used machine users are prime candidates to purchase new machines in the future.
Do not expect to get a bunch of free training, but most equipment suppliers are happy to sell you training time.
I do not know what kind of CNC you are looking for, but be aware that PTP machine controls and software have changed faster and more fundamentally than have the controls and software for heavy routers. A ten-year-old PTP is probably running a controller and software that bears no resemblance to its modern counterpart. A 10-year-old heavy router, on the other hand, is probably going to have a fairly standard machine tool control that looks and works a lot like new controls of the same brand. What this means is that unless your PTP supplier has an "old timer" in tech support, the old PTP may be as big a mystery to your tech support as it is to you. More standard industrial controls, like you would find on milling machines and routers, are usually supported by the control manufacturers for a very long time after the last new unit is sold. For example, a Fanuc 6M control from the early 80's is not only still supported by Fanuc, but by a number of after market vendors as well.
Before you buy a used machine, call the manufacturer and get its service history. Also get a service technician to look it over before you purchase the machine. You will not be a happy guy if you find it's worn or has parts that are cobbed together. The things that can go wrong can cost big bucks. After market training and support is available through us independents.
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