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Delta belt sander hump/ridge in middle of belt?

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Forum topic by Jmdowdy posted 06-09-2016 06:17 PM 821 views 0 times favorited 10 replies Add to Favorites Watch
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Jmdowdy

3 posts in 329 days


06-09-2016 06:17 PM

Topic tags/keywords: 31-695 delta belt sander 6x36 belt sander hump ridge question

I have a Delta 31-695 6”x36” belt sander. It’s been a decent machine for several years now. Recently the belt has started forming a hump/ridge in the middle of the belt around the circumference. See the attached photos. Both photos were a top down view of the belt, one includes a straight edge so you can see that the hump is quite pronounced. I thought it was a bad belt so I replaced it with another perfectly flat belt only to have it do the same thing after a few weeks. I can’t find any noticeable problem with the end rollers. Everything runs smoothly, but this hump makes sanding wide pieces nearly impossible. Has anybody experienced or heard of this problem? What should I check for to eliminate this issue? Thank you.


10 replies so far

View MadMark's profile

MadMark

979 posts in 1055 days


#1 posted 06-09-2016 10:13 PM

Replace the belt, waxing the bed before putting the new one on. Double check your rotation arrows as you install. All else fails its time to buy a newer, better one.

M

-- Madmark - Madmark2150@yahoo.com Wiretreefarm.com

View TheFridge's profile

TheFridge

6650 posts in 1088 days


#2 posted 06-09-2016 10:35 PM

It’s where the belt stretched it looks like. Not much you can do aside from replacing.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View runswithscissors's profile

runswithscissors

2371 posts in 1627 days


#3 posted 06-09-2016 10:50 PM

2 possible causes I can think of: You might have concentrated pressure on the middle of the belt for an extended period of time, which could have heated it up and stretched it. Or, the crown in the rollers is causing that—but I don’t know why it would, as these sanders typically have crowned rollers, and it’s not a problem I have ever noticed.

You also mentioned that the hump showed up after a few weeks, which suggests my first idea might be right. Also, the belt looks well used, and it may just be tired out. I sag like that when I’m tired too.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View cabmaker's profile

cabmaker

1533 posts in 2411 days


#4 posted 06-09-2016 10:51 PM

That is an inherent problem with non oscillating sanders. Its a hot spot…..just indicates you actually use the sander.

You might extend the belt life a bit by layering up your platform with random thicknesses to give that hot spot some relief.

Enjoy JB

View Rick M's profile

Rick M

8918 posts in 1982 days


#5 posted 06-10-2016 01:28 AM

Belts are consumables.

-- http://thewoodknack.blogspot.com/

View Jmdowdy's profile

Jmdowdy

3 posts in 329 days


#6 posted 06-10-2016 03:24 AM

Thanks for the response. The new belt hasn’t seen much use since I installed it. It sat mostly idle before I noticed the same hump as the first belt. I’ll buy another belt next time I’m at the hardware store and give it another try this time taking note of how hard I’m using it and to try and avoid hot spots that would compromise the belt.


That is an inherent problem with non oscillating sanders. Its a hot spot…..just indicates you actually use the sander.

You might extend the belt life a bit by layering up your platform with random thicknesses to give that hot spot some relief.

Enjoy JB

- cabmaker


View oldnovice's profile

oldnovice

5968 posts in 2970 days


#7 posted 06-10-2016 03:34 AM

From my experience it appears that the belt has gotten wet!
I have seen that as my belt sander is outdoors and at one time the cover was not on correctly; I noticed moisture on the middle of the belt and after it dried a warp/bubble formed in that area.

That’s my story and I am sticking to it!

-- "I never met a board I didn't like!"

View devann's profile

devann

2246 posts in 2294 days


#8 posted 06-10-2016 06:10 AM

Are you using a belt sander cleaner?

-- Darrell, making more sawdust than I know what to do with

View Jmdowdy's profile

Jmdowdy

3 posts in 329 days


#9 posted 06-10-2016 06:29 AM

On occasion, as needed, I have.


Are you using a belt sander cleaner?

- devann


View bondogaposis's profile (online now)

bondogaposis

4245 posts in 1953 days


#10 posted 06-10-2016 12:48 PM

Try a different brand of belts.

-- Bondo Gaposis

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