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docs/machines/LargeFormatCNCRouter.md

-# Large Format CNC Router
+# Large Format CNC Router
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+
+1) [PrintNC](https://wiki.printnc.info/en/home) Large CNC Router - Fully Open Source CNC Router build with great Wiki having full assembly instructions
+- Complete BOM, CAD and instructions to build.
+![PrintNC Picture](https://wiki.printnc.info/printnc-v3.png)
+Specifications:
+- Cutting Area: 1000 mm x 600 mm (Build size can customized)
+- Materials: Can cut Wood, plastics and Aluminium
+- Linear Motion: Ballscrews with BFBK bearing mounts
+- VFD water cooled spindle
+- GRBL 
+
+2) 
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docs/mechanics/Ball Screws.md

@@ -36,4 +36,6 @@ There are several disadvantages.
 
 For your particular application, you need to evaluate the tradeoffs. Either could be your answer. If the analysis is too complex, you could default to belt drive. You could put the money you would have spent on ball screws, ball nuts, and extra bearings into wider belts, higher torque motors with smaller step angles, and better (higher voltage, faster switching) motor drives.
 
+- There are two types of ball screws- rolled and ground. The cheap chinese ones are the rolled ones and specs won't be as good as the ground screws. 
+- 
 [Information](https://www.machinedesign.com/mechanical-motion-systems/linear-motion/article/21828146/the-importance-of-ballscrew-end-fixity) on fixing methods of ball screw ends and their importance
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docs/mechanics/Lead Screws.md

+# Home
+
+[Information](https://www.designworldonline.com/how-to-correctly-apply-lead-screws/) on choosing Lead Screws
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docs/mechanics/Linear Motion.md

 # Home
+
+[Build Your CNC](https://www.buildyourcnc.com/CNCMachineMechanicalParts.aspx) website has much information of the various components required for creating linear motion in CNC machines along with their properties and costs. 
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docs/mechanics/Linear rails.md

 # Home
+
+[Comparing](https://www.designworldonline.com/how-do-miniature-profiled-rail-guides-compare-to-their-full-size-counterparts/) miniature linear rails (15mm) with standard sized linear rails
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