Re: thin layers

From: Brian Bauman (Accelerated Technologies , Inc.)
To: Elaine Hunt (Clemson  University), RP-ML
Date: Saturday, January 21, 1995
Subject: Re: thin layers
Here at ATI, we run both the SLS and SLA processes.  Since SLA is being 
discussed, I will give feed back on the SLS process.

We run parts at .004, .005, .006 layer thickness and at times, if the part 
geometry is simple, we will run greater than .006.  Most builds are run at 
.006 layers to improve the speed of the process without sacrificing much on 
surface definition.  

However, by using a 50 micron powder such as Fine-Nylon and running parts 
at .004 layers, we definitely improve our part detail and part "crispness". 
 The part also appears to have increased density by sintering less material 
between layers.  We haven't seen much success with other materials at .004 
layer thickness.  

Once part size increases and part detail decreases, parts are run at .005 
or .006 layer thickness to improve build time as well as reduction in curl. 
 Since less energy is being applied between layers, the part has a less 
propensity to curl and retain heat.