5" random Orbital sanders leaves "streaks"

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Forum topic by Tim & Candy Hicks posted 04-01-2014 12:54 AM 1029 views 0 times favorited 2 replies Add to Favorites Watch
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Tim & Candy Hicks

332 posts in 3888 days

04-01-2014 12:54 AM

Topic tags/keywords: sanding random orbital sanders

We have always used a 5” random orbital sander and can get rid of the swirl marks, what we have trouble with is “streaks”... we sand in a straight line /back and forth motion across the surface and when we have the surface sanded you can see straight lines where the edge of the sanding pad would be…..... does this make sense and if so is it because we need a sander with a softer pad? We want to use it for fine sanding/polishing…..

Any input would be greatly appreciated


2 replies so far

View cabmaker's profile


1740 posts in 2987 days

#1 posted 04-01-2014 03:01 AM

What sander are you using?

What are you sanding?

Are you progressing thru the grits ? (neglecting grit progression often lends to those results)

If truing the material is a non issue you probably need a softer pad as you will get better results a bit faster.


View realcowtown_eric's profile


617 posts in 2115 days

#2 posted 04-01-2014 04:09 AM

I’ve got 3 or 4 dewalt ROS as well as a whole plethora of other brands in various sizes and configurations, hard/soft plates etc. and there is a plate on the ROS inside which inhibits the rotary motion, and it DOES wear out. Replacements are cheap.

How do you know when to replace it? when you lift the sander off the work and it starts to spin up in speed.

Set it down on the work piece when it’s up to high revs, and you no longer have a ROS, what you got is a disc sander…Big difference. Real big difference.

Also look at the velcro pad…it often times picks up debris in the velcro, which telegraphs through the sandpaper, , so if a real bad case, you might think yer sanding, but it’s only the one high point that’s doing the work.

As well, some of the cheaper sanding discs from the borg,,,,was it the “lizard” brand?? seem to have their holes punched two discs at a time…one disc has the holes punched up from the grit side, the next one, exactly the inverse…so that one ain’t gonna work so well. ergo half of em is trash and you didn’t save a penny!

And I know it’s probably anatheme to the purists, but I use my Dewalt ROS for wet sanding too. The dust port connection fits well to a shop vac. The little bit of moisture from the spritzer don’t seem to do too much damage to theshop vac bag or filter if it’s partially full.

If you’ve got a few years on the ROS, I’d invest in this…

New life for an old friend. I keep two or three in stock.

Oh- they didn’t tell you when you bought it? suprise!

-- Real_cowtown_eric

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