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equipment:lapping:type [2014/10/12 18:44] – mcmasterequipment:lapping:type [2015/06/30 16:05] (current) – [Platen] mcmaster
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 +Lapidary machine: more proper name referring to use on rocks.  Tend to be less precise or more like faceting machines
 +
 +Cabbing/faceting machine; instead of arm support has a post with a precise angle adjustment and holder.  This might make a good DIY conversion route
 +
 +
 ====== Setup types ====== ====== Setup types ======
  
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 === Overhead arm === === Overhead arm ===
 +
 +{{alliedhightech:15-2000-gi:multiprep_2014.jpg?300}}
 +
 +Above: Allied High Tech 15-2000-GI [http://www.alliedhightech.com/Equipment/multiprep-polishing-system-8|Source]
  
 A motorized arm is suspended above the platen. A motorized arm is suspended above the platen.
  
-Example: Allied High Tech 5-2000 MultiPrep System+Example: Allied High Tech 15-2000 MultiPrep System 
 + 
 +Advantages 
 + 
 +    * Less force on platen than side arm design 
 +    * Easier to control force? 
 + 
 +Disadvantages 
 + 
 +    * Parts are usually machine/manufacturer specific 
 +    * More limited selection
  
 === Side arm === === Side arm ===
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     * Higher precision?     * Higher precision?
     * Simpler     * Simpler
 +    * Somewhat scalable: larger size generally yields higher precision
  
 Disadvantages Disadvantages
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     * Tend to be larger than overhead arms     * Tend to be larger than overhead arms
     * Larger fixture: larger lapping machine required     * Larger fixture: larger lapping machine required
 +    * Force can be harder to control: typically adjusted by applying weights \\       * Pneumatic versions exist
  
 ===== Perpendicular polshing ===== ===== Perpendicular polshing =====
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     * Cast iron     * Cast iron
-    * Diamond+    * Diamond, Al oxide, etc film surface
     * Poromeric pad     * Poromeric pad
  
-However, cast iron and diamond are too abrasive for IC RE and so only polymeric pads are typically used. +Cast iron and diamond is generally too abrasive for IC RE.  Poromeric pads are standard issue and some Al oxides look suitable.
- +
-Some machines can take magnetic apds such that one can switch, say, between a diamond and cast iron pad.  As you should really only be using polymeric pads this feature will probably be less useful. +
- +
-{{gallery>:tutorial:lapping:layers.jpg}} +
- +
-Above: typical stackup seen on JM machine consisting of (top to bottom): +
- +
-    * MTI 8" Poromeric Polishing Pad (PSA) for final polishing - EQ-PP-8PSA-PC +
-    * Two 8" Mater Plate ( Backing Plate ) for PSA Diamond plate, Sand Paper & Polishing Pad - EQ-MBP-8-2 +
-    * CrystalMaster 8 master lap+
  
-The first, the poromeric pad is the most important.  It is essentially a soft pad to move abrasive around without actually scratching the die.  The next forms a smooth surface on which the poromeric pad rests.  Finally, the master lap is the interface to the machine itself and has ridges to keep backing plate in plate.+Some machines can take magnetic pads such that one can switch, say, between a diamond and cast iron pad.  If you are only using poromeric pads this feature will probably be less useful but could be if you are using films.
  
-Originally the machine had a steel backed diamond pad directly on the master lap (attached with adhesive, removed with acetone + heatgun).  In this setup the steel backing is much stiffer than the polishing pad and so serves as the backing plate. 
  
 ==== Cast iron ==== ==== Cast iron ====
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 aka: aka:
  
-    * Logitech: york support+    * Logitech: ? 
 +    * MTI: york support
     * South Bay Technology: yoke assembly     * South Bay Technology: yoke assembly
  
equipment/lapping/type.1413139463.txt.gz · Last modified: 2014/10/12 18:44 by mcmaster