View Single Post
  #3  
Old 07-08-2018, 07:42 PM
Kerry Pinkerton's Avatar
Kerry Pinkerton Kerry Pinkerton is offline
Administrator
 
Join Date: May 2009
Location: Near Huntsville, Alabama. Just south of the Tennessee line off I65
Posts: 8,321
Default

Charles is right but a wheeling machine is a continuous impact hammer, if the wheels have pressure on them, stretching is happening. It may not be much but it's there. With no pressure but close contact, you can rearrange metal much like pressing it on something from one side only.


Planishing is French I believe and basically means, 'hit lightly many times'. Many planishing hammers can hit a ton and will stretch the heck out of a panel in half a nanosecond. It takes a good bit of experience to work with a powerful planishing hammer...especially in aluminum.


Welds are planished in order to stretch out the shrink caused by the heat of welding. Metal left 'proud' when planishing will be flattened and pushed into the surrounding area (metal flows in the path of least resistance). Lumpy or inconsistent prouds will create a wavy panel if you're not careful.


I hope this helps Chris.
__________________
Kerry Pinkerton
Reply With Quote