Conical Disk

[Ed in Tampa]

Hi Doug! Happy to have someone else in the same camp!:) It seems, others have had problems. Maybe it's the humidity!

chuck
I will jump in here as someone that changes paper also, I have always done it and didn't know of a problem until I read about them here.

One thing I suspect is it is easy to really heat up the paper during sanding. I wonder if some of the problem might because in some cases the paper is allowed to get too hot and once it cools it is really stuck to the disk.

I have found this to be true with the flat sanding disk, any that got fairly hot and allowed to cool were really stuck. The first time I discovered this I had used my disk sander to hog (I was in a rush what can I say:o ) off some wood. I quickly finished sanding it down and turned the SS off and went on doing what I was doing. About 2 days later I tried to remove the paper from the sanding disk. It wasn't a pretty sight. Since then I have learned to be more patient with my sanding.

Also as someone mentioned the disk needs to be clean. On every paper change I clean the disk surface with Naptha and make sure it totally dry and dustfree before I install another sheet of paper.

[kalynzoo]

I guess I still have not mastered the conical sanding disc. At first the paper would not stick. I then cleaned the disc with denatured alcohol, sprayed on 3M tacky adhesive, and applied the split paper. It now holds well, but I can't imagine trying to change the paper for re-use. I just leave on medium grit. If I need a finely polished edge, I still glue the 320 grit or above to a melamine surface, and hand plane across the paper. Mostly I use the flat disc. I have one fitted to hook&loop, which is great for wood. The other is stickon, and I use it for sharpening.
As for heating the disc to remove the glue, once again I live in SoCal. A few minutes on the driveway, and I need gloves to pick up a metal tool. It did drop to 42 last night, but this morning it is still T-shirt weather.
Wish you were here.

[charlese]

Today the shop was 40 degrees at 9:00. Turned on the heater and it was 50 at noon. The inside humidity was 60% due to melting snow.

Got the disk out of the cupboard. It was cold! I put the disk in front of the heater for 1 hour, from 11 to 12 AM. It was almost too hot to handle. Removed the 80 grit that was on the disk and replaced it with some heavily worn/abused 150 grit. In fact this is the ripped disk I mentioned earlier. Went in for lunch and to get the camera. After the disk cooled down for an hour (lunch) the old sandpaper was well adhered.

Re- warmed the disk again (15 minutes this time) removed the old abused paper and re-installed the original disk.

Cleaned the disk after each removal with mineral spirits. All glue is still on the sandpaper backs. As long as the metal disk is thoroughly warmed, there is no problem changing sandpaper and getting god adherence, as long as paper and disk is clean. BTW - the original 80 grit paper had been on the disk for several months.


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[reible]

And in case you have any problems please call Chuck at home day or night at 1-661-555-1212.

Now don't be silly that is not Chuck's number....

Now I want all of you to go and change the paper on your conical disk and do a bunch of sanding then switch back and forth several more time then report back here if all went well for you.

I need to be sure before I ever try this again... perhaps the only time this problem ever occurred was with me and that disk... long shot on the odds but it could be. I will say if it does happen the POP makes you think that parts will be flying out from somewhere or at least you will have a major crack in your shopsmith somewhere...

You almost have me convinced to try it again but not quite... BTW I used the "bake in the sun" or "warm oven" method and just about the ways that have been discussed here by Chuck.

The major difference might be in the "winter over" where my garage gets very near freezing and it could be due to my ordering process which I buy on sale and stock up. I know it has been two or three or maybe four years since I last stocked up.

I'd like to be convinced as it would be nice to put off ordering a second disk for a while longer... still think that is the best solution time wise for me but my tool budget took a $440 hit from last years.

Ed

[kalynzoo]

I will definitely give changing the paper on the conical disc another try.
Just a thought, did the paper stick because the adhesive was still good and the disc was clean...or was it frozen solid to the metal surface? Just asking.

[charlese]

Your guess may be right on, Ed -- The overwintering in your garage and age of sandpaper may be the problem. My shop freezes a couple or few times per year, but not every night and only for about 8 weeks per year.

I was interested to see nick refer to the possibility of getting sandpaper with bad adheasive. Hmmmmm-- I've not had any mucilage on the sandpaper fail as of yet. But Murphy is alive and well!


This from Nick on 12-18-2006 (his 744th post)
Shouldn't matter if you store them horizontal or vertical and, no, the adhesive does not lose its "stick" perceptibly over 3-4 years. The trick is to apply the sandpaper to a warm (70-100 degrees F), clean (no dust, no old adhesive) plate. Clean the plate thoroughly with mineral spirits or naptha and let the solvent evaporate completely. Warm the plate with a heat gun or in an oven and apply the sandpaper.

If, by some chance, you got a batch of sandpaper with bad adhesive (I've never heard of this happening, but I suppose it could), spray the plate with a little 3M "77" spray adhesive (available at most hardware stores).
With all good wishes,
__________________
Nick Engler, Director
Shopsmith National Woodworking Academy

[a1gutterman]

Hey guys!

I think it is great that so many of you have knot had a problem reusing the sanding disks. I was probably doing something wrong when I tried. Does knot matter. For me the solution was multiple disks, and since I already have them, I will knot be trying to reuse any more sanding disks. As I already mentioned, having a disk for each grit is a real time saver.

[Ed in Tampa]

Actually in the late 80's Shopsmith did have a problem with the adhesive. I got a pak of assorted grits and most would not stick. I complained and SS admitted they had a problem and sent me a new batch.

That was the flat disk paper. I have never had a problem with conical disk.
Although I did catch a edge once and had it pile up like Reible's did. However it didn't excite me as much as it did him and I have never worried about it happening again. Oh yes the side of my table has been sanded a few times either from the paper coming off or me moving the disk to close. Again no big deal.

I also once shot a hook and loop disk off the disk, I flew past me as it went sailing I reached up and snatched and pressed it back on and finished sanding. Again no big deal

[shydragon]

I have not tried to change paper on the conical, but recently I did change it on one of my flat discs. I used Ricks hot water soak to remove the old paper, the results were not good. Cleaned it thoroughly, I thought, but the paper started coming loose at the edges. So, last weekend, I removed it, cleaned off all the residue, made sure I had it sqeaky clean, then put it in the oven at the lowest setting for 15 minutes. I then applied the new paper, which by the way is 15 years old. I have not had any problems this time.

[a1gutterman]

Conical disk on sale right now for $37.76, until Monday @ midnight. http://www.shopsmith.com/ownersite/specials/6HC31.htm?jn=10034&;kt=MKT&kr=0007698519&cnum=0007698519&epn=RWVYVTU