A service level agreement SLA for IT help desks is only as good as the people backing up the agreement for a discussion of what to expect in an SLA, see the following discussion. The SLA is just a standard to which you should compare your support. Is your IT help desk fitting the bill?
Expand Both stereolithography and selective laser sintering use lasers but ultimately they're very different processes. Tim Plunkett examines the pros and cons of each. Comparing processes for prototyping isn't easy — Tim Plunkett starts to get to grips with two of the top contenders, stereolithography and selective laser sintering.
The immediate reaction to this question is usually SLS — after all, a large part of the growth in laser sintering applications is due to the functionality offered by nylon. However, if we look at the material properties of Duraform standard nylon for laser sintering in comparison to Stereolithography resins in this case Xtremewe can see how far Stereolithography resins have developed.
Tim Plunkett takes a look at the pros and cons of the two processes and the factors that will influence your decision… The immediate reaction to a question of this sort is to say SLS - after all, a large part of the growth in laser sintering applications is due to the functionality offered by nylon.
That said, all might not be what it appears to be! For example, as engineers we are really interested in the material yield data and these figures are frequently not quoted. The reason is that for most, SLA materials yield and ultimate values are virtually identical.
In some cases SLS may offer a difference, but getting consistent repeatable data is another thing altogether.
Taking elongation to break, the figures look better for SLA. That said, and particularly with SLA materials, what is not quoted is the effect of age. Data is difficult to come by, but whatever the specification says, these numbers will fall substantially with time.
Further, if this is an issue, then Duraform is not the best SLS material. Alternatives such as EX will do a much better job i. Looking at impact, the figures quoted for Xtreme are surprisingly good. The heat deflection temperatures for SLA materials are all well down on the equivalent for SLS materials and thus load at temperature is a real issue.
In this case Xtreme is one of the better SLA materials, but this should be watched even in our climate! Both temperature and moisture can destroy the properties of an SLA part as well as leading to enough growth as to render the part unusable.
Fortunately with wise material selection this can be controlled or at least reduced within the realistic operating life. Nylon also absorbs water. For example on ProtoGena thermal postcure can raise the HDT from 53 to 93 degrees C, tensile and flexural strengths also improve, but elongation is adversely affected.
It has not been superseded by SLS. It still has a better surface finish, typically better accuracy. It just offers different advantages — but check which resin you are getting!DC/SLA board meetings are open for all members to attend. In , we are having all our meetings at KPMG near Farragut ( K Street, NW - Suite ) on the 2nd Thursday of every month.
October\'s meeting is on Oct. 12, from PM.
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What is SLA/FLA? Definition of SLA/FLA: An established theoretical basis for second or foreign language acquisition that involves a process of input, apperception, comprehension, intake, .
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