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Thread: Delta model 31-396 edge sander ( belt troubles..)

  1. #1
    Join Date
    Nov 2006
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    Delta model 31-396 edge sander ( belt troubles..)

    Ok here is what i am incurring, i wanted to to sand the edge of a board and be square when done both in thickness and width, but with the belt being bubbled or not tight against the platen its not going to happen.. even on the long way its going to sand a concave area..


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    if anyone has a edge sander and can help i am all ears,, have talked with a couple of you and it seems i need more belt tension, but this thing tilts the head to make it oscillate and therefore it basically is loosening up and the tightening back down,, to me the belt should be flat against the platen when running, in order to sand flat anything ,, as it is the part gets sanded before it ever puts pressure against the platen.. if you or your neighbor has one of these test it out for me or see how theirs works.. becasue this one seems to have issues or the operator needs to read some tech manual
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  2. #2
    Join Date
    Apr 2007
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    I will do some pics after work and post them . . . Later that day . . .

    Before you drive yourself nuts, pull the belt and put a straight edge on the platen to assure it is flat.

    Here is the spacing from my add-on table to the belt under tension. All my belts stay flat against the platen when tension is on however, they were all bought new from Klingspor except for the Klingspor belt that came on the machine. The platen has graphite material on it. I have some 6" peel and stick graphite cloth but don't recall where I got it. If your machine does not have this I can dig up the source. It was pretty inexpensive.

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    Here's an overall shot. The table comes off with a spin-tite to loosen the recessed bolt heads. The little white bumps on the left edge are nail-on feet that keep it off the concrete when I store it over by the spindle sander. Since I leave the auxilliary table on most of the time, this may have been overcautious :

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    I used the t-nuts supplied for an accessory fence with the sander. The fence is a laminated pair of 3/4" BB ply strips milled square and attached with a fixed through bolt at the platen end and a "loose" through bolt at the operator end for adjustment. I just hold a machinists square against the paper/platen and square the fence to that.

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    Here's a shot of the tension on and off as well as a shot of the motor mount (the oscillator is at the idler end on this model).

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    Last edited by glenn bradley; 01-09-2014 at 12:10 AM.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  3. #3
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    More pics . . . . Here's a shot with the back guard off, you can see the oscillating mechanism in the lower right of the pic. There is also a shot of the really simplistic adjustment mechanism for table height and belt tilt.
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    Here's the tension on and tension off view from behind:

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    You can see that there is only about 1/2" of travel between loose and tight on the belt but, it seems adequate. When tight there is a reasonable bit of motion in the handle so that as the belt stretches, tension is maintained.

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    I hope some of this might help with your troubles.

    P.s. Here's how I quickly set the table to platen gap and square the fence when I re-install the table.

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    Last edited by glenn bradley; 01-09-2014 at 12:22 AM.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  4. #4
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    Nov 2006
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    Delton, Michigan
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    thanks glenn for all these shots and your trouble.. on mine the oscillator is on the motor side, will do as you suggest and replace the belt.. also will take some pics of my setup later.. thanks again..!!
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  5. #5
    Join Date
    Jul 2009
    Location
    Central PA
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    638
    Have you tried a new belt? I have noticed that as belts wear they stretch and can "puff" out in the middle. I have a homemade edge sander, it does not oscillate but I built it with the platen just proud of the drive and idler rollers to ensure that the belt stays flat against the platen. Is there an adjustment for the platen position (out /in) or can the rollers be adjusted? I would check with a straight edge to see if the rollers are behind the plane of the platen and if they aren't start looking for places to make adjustments. If there are no adjustments to be made adding some graphite cloth will help move the platen plane out.

  6. #6
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    thanks dave, will give that a look today.. the alignment issue makes sence
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  7. #7
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    well thanks to Dave and Glenn for there help in this and i was able to get this setup and running as i thought it should be.. here is where i am now and that seems to be close enough for what this tool is expected to do..
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    now a couple questions first,, how long before the belts go bubbly, and 2, should i detention the belt when not in use
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  8. #8
    Join Date
    Dec 2007
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    Billings Missouri near Springfield Mo
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    Quote Originally Posted by larry merlau View Post
    well thanks to Dave and Glenn for there help in this and i was able to get this setup and running as i thought it should be.. here is where i am now and that seems to be close enough for what this tool is expected to do..
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    now a couple questions first,, how long before the belts go bubbly, and 2, should i detention the belt when not in use
    It will last as long as the grit is good and I never did loosen mine and never had an issue
    A Turn N Time
    Components for John Smith Organs and the Hobby Organ Builder

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    Before you criticize someone, you should walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes.

  9. #9
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    jay i was referring tot he bubbling stuff,, the belt i took off wasnt worn out just bubbled..
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  10. #10
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    Glad you got it fixed Larry!
    A man is rich in proportion to the number of things he can afford to let alone. -Henry David Thoreau
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