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Author Topic: Small swirl patern  (Read 2889 times)

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Offline mastercabman

  • Posts: 1854
  • NORFOLK,VA
Small swirl patern
« on: January 31, 2009, 09:03 PM »
I am making a simple counter top.I'm using 3/4" maple plywood and i use maple edge tape for the expose edges.
I was sanding the top with my rotex 150 and i noticed swirl mark all over the surface.
Very small,about 1/8"- 3/16". I try to sand again with 400 g. and could not get them off.
So i decided to use the other side.But it has a small flaw on the surface that is very noticeable,so i flipped it again and used a damp cloth to wipe the surface (trying to raise the grain)and then try to sand it again.I got lucky,the swirls are gone.
So now I'm back in business.
But what caused those swirl marks?  Could it be dirt trapped between the work surface and sander?
I don't understand!?! I keep cutting it,and it's still too short!

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Offline Jim Marsh

  • Posts: 29
Re: Small swirl patern
« Reply #1 on: January 31, 2009, 10:03 PM »
While this has never happened to me I just read about it in the 2009 catalog (see page 171). They have a tip that indicates to turn the suction on the "vac" down towards the turtle to avoid possible "swirl" marks. If you were using the vac maybe this is the reason.

Jim

Offline EcoFurniture

  • Posts: 608
    • Eco Furniture
Re: Small swirl patern
« Reply #2 on: January 31, 2009, 10:03 PM »
Clean your workpiece between grits! To much down force created by the vacuum can also cause the swirl marks.  

Offline Tom Bellemare

  • Inactive Member
  • *
  • Posts: 5148
  • Festool demo's & personal service in Central Texas
Re: Small swirl patern
« Reply #3 on: January 31, 2009, 11:17 PM »
'Spot on...

Try to adjust the CT so that the sander is loading the same with the vacuum as it is without it. Too much suction pulls the sander into the work piece and is the equivalent of leaning on it. You can hear the right adjustment of the CT.


Tom

Offline Greg_R

  • Posts: 153
Re: Small swirl patern
« Reply #4 on: March 03, 2009, 01:56 PM »
Also, pushing down on the sander will cause the swirls.  Just let the weight of the tool do the work and make sure the vac is adjusted properly.  The circles are particularly common on hard wood like knots, compressed grain, and tropical hardwoods.  With proper technique you can avoid them.

BTW, the circles are the size of the random orbit pattern.  That's 1 grain on the sandpaper spinning around / scratching the surface.

Offline John Langevin

  • Posts: 245
  • Springfield, MA
Re: Small swirl patern
« Reply #5 on: March 04, 2009, 11:02 AM »
Ditto the above comments on vac speed, downforce, cleaning. Were you getting any loading (corms) on the abrasive disc? If this happens you will get somewhat larger marks. With the Festool System you have the ability to accurately adjust all these parameters and optimize your results.
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