Before buying a used CMM there are several CMM basics you should familiarize yourself with.
Find out if you can in what kind of environment the used CMM machine has been operated. What about the accessories and replacement parts like reference sphere, CMM ball bar and probing items?
Have you thought of potential repair costs, CMM calibration and a CMM service provider as well as the warranty questions?
What CMM software package is the pre-owned model equipped with and do you need CMM software training?
There are many factors to consider when comparing used CMM machines with new models especially when you can get introduction specials or show sales for a respectable discount.
Before considering a used coordinate measuring machine for sale it is advisable to do your research and check off all the items on your priority list.
You might also inquire about CMM retrofit options. With a powerful CMM software it is often possible to speed up a CMM significantly as well as achieving a steep increase in measuring power.
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3D measurement on compound curved surfaces is often done with manual 3D CMM machines using Helmel Engineerings vector point approach.
Any CMM can do 3D measurements probing points on a surface but not necessarily probe all important points and output the data needed.
3D measurement technology on surfaces for analysis is an area of research with abstract complexity.
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A used or pre-owned coordinate measuring machine needs to be set up properly and maintained professionaly with the appropriate servicing in order to be cost effective. Longterm calibration expenses need to be addressed when purchasing a used CMM also.
A potential CMM retrofit might be considered before the decision making process.
It could be also valuable to look for CMM promotions before retrofitting used CMMs. In certain cases monthly rentals can be evaluated depending on the specific requirements.
Another option could be to look for introductory specials for new CMMs like the Phoenix RB which is a DCC CMM that can be obtained in America under $20,000.
Filed under Used CMM For Sale by CMM
Coordinate measurement machines give results that are a representation of the 3-dimensional coordinate system.
The critical components in coordinate metrology for high quality CMM machines include the drive systems, control systems,bearings, probe heads and feedback elements.
The coordinate measurement process probes the objects surface at discrete measuring points using analytical models of the objects.
Main challenges for a coordinate measurement machine are to perform in a production or shop floor environment versus controlled gage rooms.
3D coordinate measurement machines have been used since the 60's for quality control inspection purposes.
Back then the coordinate measurement machine was primarily used in the lab and was a manually operated tool.
Applications for shaft measuring machines were measuring diameters and lengths with hard probes.
After CMM software entered the market the fully automatic coordinate measurement machines were able to perform much faster measurements.
Nowadays a coordinate measurement machine is often also used in high-output production environments even though temperature changes, vibration and dirt cause generally major issues to a coordinate measurement machine cmm.
Helmel Engineering is the only american coordinate measuring machine manufacturer left as of 2001.
When Helmel started in 1973 10 coordinate measuring machine manufacturers marketed their CMMs in the United States of which 8 were domestic.
Since then all of them closed their doors, took their CMMs off the market or sold their CMMs to another coordinate measuring machine manufacturer.
Since around 2001 Helmel is the only one left from all original CMM manufacturers.