how to keep 7" sanding disks from warping

[tigbencher]

As the title says i am wondering what everyone tries out there to keep their 7inch 36 grit sanding disks from warping with temperature and humidity changes in their shop thru out the year.have tried running a dehumidifer in the shop and sealing unused disks back in the package with some success.any ideas ?thanks

 

[metaleltr]

How often do you go through them,

http://www.tooltopia.com/steck-auto...scplp6828998&gclid=COeRvOPN1L0CFa9cMgodeBgAYw

could accomplish the same thing with a bolt, wingnut and washer, depending on rate of use

 

[jakemac]

Take two pieces of 1/2" plywood 10"x10", four wingnut/washer/bolt sets and make a clamp/press to keep your disks flat when not being used.

 

[tigbencher]

have tried a press of sorts(basically a centre round steel rod 1/2" dia welded vertically to a steel flat plate base)then slid the unused disks down the rod stacking them with a heavy 50lb weight down on the disks.once removed there are still warped some look like the shape of a taco shell.manufacturer say store in resealable bag at between 35-80 f and 35-50% humidity,which is not always doable this side of putting them in something like a humidor.

 

[WhoWhatNow]

Take two pieces of 1/2" plywood 10"x10", four wingnut/washer/bolt sets and make a clamp/press to keep your disks flat when not being used.

I just picked up a 20" disc sander at an auction and this is what the PO did.