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PostPosted: Mon Jan 08, 2018 10:06 am 
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bcombs510 wrote:
I put a piece of Zebra wood on a sled through my Dewalt planer when I was first starting to get into building. It was like a dozen angry porcupines were in there. Some of the shards literally stuck in the wall.


Yikes. That's exactly what I was afraid of. Thanks for making it so vivid. Now I'll never do that.


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PostPosted: Mon Jan 08, 2018 11:18 am 
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bionta wrote:
"I've been too apprehensive to attempt planing very thin wood in my planer. Maybe I'd be more confident with a more modern machine (helical head?) but in the machine I have, I haven't tried anything below 3/16". I've been hoping to go the last step with the drum sander. Sounds like I have a learning curve to climb."

klooker wrote:
" I've had good luck using double stick tape & a carrier board,"

When wood gets too thin the planer wants to suck it up into the blades and turn it into wood chips. Sticking it securely to a flat carrier board allows you to take it down past that point. (but if it comes loose - wood chips!)



These users thanked the author Clay S. for the post: bionta (Mon Jan 08, 2018 12:29 pm)
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PostPosted: Mon Jan 08, 2018 12:01 pm 
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bionta wrote:
I don't understand why you had to cut down the 2-3/4" roll. Don't you just have to make the diagonal cut at the end long enough to go once all the way around the drum? I would have thought you could just lay the end of an old 3" strip on top of the new 2-3/4" strip with the outboard edges aligned and cut to match. You'd have to wrap the new strip around the drum to get the right length and then just do the same on the other end. But I haven't tried it. Maybe I'm missing something here.


The math is beyond me, maybe someone with more experience will chime in... but here is what I can say - the taper is a constant. It's the same as the diameter of the drum. The way that the Jet manual tells you to cut the paper is to:

1) Put the taper on one end. Align the taper so it is facing outboard.
2) Roll the paper onto the drum as usual. When the edge of the paper meets the opposite edge of the drum, mark the paper.
3) Take the paper back off and make a taper going the opposite direction starting at the mark you made in step 2.

If I did exactly that with the 2 3/4" paper the end of the tapered cut did indeed land right at the end of the drum. But
the attachment clip was on the opposite side of the drum! Try it with a roll of paper cut to 2 3/4" on your drum. If it lines up you're golden. If it doesn't you can do all the same mental gymnastics I did to find out the magic ratio. For my 16" kit was 2 1/2". :)

Here is a great video where Susan Gardener gives us all the details on how to create the template. This method works absolutely perfectly if both attachment points are on the same side of the drum.
http://www.youtube.com/watch?v=RpfCSz9HwKU&t=510s

The Jet (and I suspect others) the attachment point is on opposing sides (not ends, of course its opposite ends :)) of the drum. This means that the width of the paper becomes important so that the correct number of wraps lands you at a point where the taper doesn't fall short of or overlap the attachment insert.

Words are failing me here. It's maybe time for a video. But try it with some roll paper and you'll see what I mean.

Hope some of that helps.

Brad

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These users thanked the author bcombs510 for the post: Pmaj7 (Mon Jan 08, 2018 6:24 pm)
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PostPosted: Mon Jan 08, 2018 12:30 pm 
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Cocobolo
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Thanks Brad. I'll give it a try with some paper.


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PostPosted: Mon Jan 08, 2018 2:29 pm 
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If you own at least one roll of pre-cut paper that fits your sander, wouldn't it be easier to just lay the pre-cut paper over the uncut paper, trace it's profile onto the uncut paper, then cut on the lines?



These users thanked the author doncaparker for the post: bcombs510 (Mon Jan 08, 2018 3:04 pm)
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PostPosted: Mon Jan 08, 2018 3:05 pm 
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doncaparker wrote:
If you own at least one roll of pre-cut paper that fits your sander, wouldn't it be easier to just lay the pre-cut paper over the uncut paper, trace it's profile onto the uncut paper, then cut on the lines?


That only works if the precut paper is the same width as the Abranet, which it isn’t.

The Abranet comes in funky widths. All the pre cut drum sander rolls I have seen come in paper that is 3” wide.


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PostPosted: Mon Jan 08, 2018 3:21 pm 
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doncaparker wrote:
If you own at least one roll of pre-cut paper that fits your sander, wouldn't it be easier to just lay the pre-cut paper over the uncut paper, trace it's profile onto the uncut paper, then cut on the lines?


Yup. That's the way to do it when the rolls are the same width. When they're not, I was thinking that you could just do essentially the same thing. You'd end up with a different included angle because the base of the right triangle was different, but the hypotenuse of that triangle would still cover the edge and the spiral would follow the new angle. But I was wrong, as Brad knew, having already tried the experiment.

I don't see how an odd width abrasive strip could work. Maybe I'm just being dense (again) but now that I've tried it and seen what Brad was talking about I see it this way: obviously the circumference and length of the drum and positions of the clamps are fixed. If the drum is e.g. 16" diameter you need to cut the starting edge of the strip to a form a triangle with a hypotenuse 16" long so you can cover the edge of the drum with the first wrap. There is only 1 right triangle with the given base (width of strip) and hypotenuse (drum circumference you need for the length of the edge). OK so far. Then you wrap the stuff around the drum. Fine. You cut the other end at the same angle and it wraps neatly around the drum. Also fine. But it ends in a spot along the circumference that is not where the clamp is because the strip didn't use an integer multiple of the same number of wraps to cover the drum.

I guess it would work if the strip's width is an integer multiple of the original strip, like 1-1/2" or 6" to replace the original 3" strip.

Maybe you could probably also play with non-right angle triangles, cutting sort of an arrowhead on the end of the strip until you found a winding angle that made your new strip width land on the clamp location. Sounds like a PITA to me. As Brad said, there's a mathematical solution to this but I seem to be too dense and too lazy to figure it out. [uncle]

Now that I said that I'm cursed. I'll probably lie awake tonight thinking about this. [headinwall]


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PostPosted: Mon Jan 08, 2018 3:55 pm 
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Oh man.... Bob, I'm with you, brother!!!

What I can tell you is that a 16" drum is covered by a 2.5" width just perfectly with a 16" long taper. I only know that because I cut up my roll of brown craft paper and experimented with it. I had the wife down in the shop too. Actually, she is the one that got close on the math and recommended 2.5". But afterward, neither of us really, truly, knew what had just happened. laughing6-hehe

I feel like it has to do with the 8" of extra distance between the clips because they are opposed, but couldn't figure out how to plug that into the formula.

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PostPosted: Mon Jan 08, 2018 4:04 pm 
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One thing you can think about is this... it's obvious, but it helped when we were experimenting...

Assume the diameter of the drum is 16". You cut the taper so that it is 16". As you wrap a 2 3/4" paper around what you notice is that wrap #1 is 1/4" short of where the 3" paper fell. Wrap #2 is 1/2" short of where the 3" paper fell, etc... until you get to the other side. In my case I think it was 5 wraps and what I was left with was 1 1/4" short of where the 3" paper would have met the end of the drum.

So in the case of 2.5" paper width the first wrap was .5" short. The next was 1" short. And of course the 5th was 2.5" short. Which means I could now get a full 6th wrap. That made it all line up.

Now... how do you extract the formula from that.

I swear there are some smart pants members here just laughing watching as the trained monkeys mash the typewriter trying to pound out Shakespeare. :lol:

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PostPosted: Mon Jan 08, 2018 4:25 pm 
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bcombs510 wrote:
One thing you can think about is this... it's obvious, but it helped when we were experimenting...

Assume the diameter of the drum is 16". You cut the taper so that it is 16". As you wrap a 2 3/4" paper around what you notice is that wrap #1 is 1/4" short of where the 3" paper fell. Wrap #2 is 1/2" short of where the 3" paper fell, etc... until you get to the other side. In my case I think it was 5 wraps and what I was left with was 1 1/4" short of where the 3" paper would have met the end of the drum.

So in the case of 2.5" paper width the first wrap was .5" short. The next was 1" short. And of course the 5th was 2.5" short. Which means I could now get a full 6th wrap. That made it all line up.

Now... how do you extract the formula from that.

I swear there are some smart pants members here just laughing watching as the trained monkeys mash the typewriter trying to pound out Shakespeare. :lol:


:lol:

Trained? My wife thinks I'm barely housebroken.

It should be a total of 9 wraps to cover my drum with a 3" strip. With a 1/4" shortage per wrap that means 2-3/4 paper would come up 2-1/4" short at the end, not quite enough for a full 10th wrap to end at the clamp location. So neither of the Mirka rolls will work very well, without a lot of waste. I might still make the switch at some point though. It sounds like the benefits are worth it.



These users thanked the author bionta for the post: bcombs510 (Mon Jan 08, 2018 4:29 pm)
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PostPosted: Mon Jan 08, 2018 4:30 pm 
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Yep, with 9 wraps I think you'd be better off buying the 4 1/2" stuff and trying to find something to do with the extra 1 1/2".

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PostPosted: Mon Jan 08, 2018 4:35 pm 
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Tape is your friend.....
My old fingers can't work those stupid clips that don't really hold the strip in place at the far end of the drum. I usually just run a piece of strapping tape around the last inch or so of the sanding strip and drum. You don't have to worry about where the strip ends. Unless you really need that last bit of width it could be a non-mathematical solution. [:Y:]

bcombs wrote:
"Yep, with 9 wraps I think you'd be better off buying the 4 1/2" stuff and trying to find something to do with the extra 1 1/2"."

Couldn't you rip the whole roll to 3 " and then wrap the drum with 1 1/2 inch strips that are twice as long?



These users thanked the author Clay S. for the post (total 2): bionta (Mon Jan 08, 2018 5:21 pm) • bcombs510 (Mon Jan 08, 2018 4:36 pm)
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PostPosted: Mon Jan 08, 2018 5:01 pm 
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I asked my question about tracing and cutting based on the assumption that the new, uncut paper is wider than the pre-cut paper, not narrower. If it is narrower, then I can see it being a real brain-teaser, and I would not try it. If it is wider, then just cut it to fit the pre-cut paper, and use the offcut for some other tasks.

All of this has convinced me to stick with pre-cut. I already own a fair amount of it, and it works fine.



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PostPosted: Mon Jan 08, 2018 5:19 pm 
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I have bought 6 inch wide cloth backed rolls and they- ripped - to 3 inch widths once you got them started, no need to cut them to width.


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PostPosted: Mon Jan 08, 2018 5:23 pm 
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Clay S. wrote:
Tape is your friend.....
My old fingers can't work those stupid clips that don't really hold the strip in place at the far end of the drum. I usually just run a piece of strapping tape around the last inch or so of the sanding strip and drum. You don't have to worry about where the strip ends. Unless you really need that last bit of width it could be a non-mathematical solution. [:Y:]

bcombs wrote:
"Yep, with 9 wraps I think you'd be better off buying the 4 1/2" stuff and trying to find something to do with the extra 1 1/2"."

Couldn't you rip the whole roll to 3 " and then wrap the drum with 1 1/2 inch strips that are twice as long?


YeaH. Right on both counts. The 4-1/2" roll ripped to 3" would leave a 1-1/2" roll that would be just as useful. Thanks for pointing that out.

And I kinda like the tape idea. I might have to try that out sometime.


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PostPosted: Mon Jan 08, 2018 6:07 pm 
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Soundls Mirka and Jet ought to sit down at the table and talk ;)

As for planers, I too have watched a nice set of Imbuia turn into wood chips when going through the planer on a backing board. I used to use CA to tack it to the board too. 90% of the times it works well enough but boy when it doesn't....



These users thanked the author jfmckenna for the post (total 2): Pmaj7 (Mon Jan 08, 2018 6:31 pm) • bcombs510 (Mon Jan 08, 2018 6:10 pm)
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PostPosted: Mon Jan 08, 2018 6:12 pm 
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bionta wrote:
bcombs510 wrote:
bionta wrote:


Correct. What drum sander do you have?

I don’t have a lot of experience with different drum sanders and how they provide attachment for the paper, but I gather they are all fairly similar since you can buy pre-cut paper that works for several different males and models. I only have experience with mine which is a Jet 16-32.

What would be worthwhile is to take a roll of your brown paper (which you should have for bending sides anyway ;)) and cut a long strip of it at 2 3/4” and experiment with trying different cuts to see what works. If I followed the manual for my 16-32 the 2 3/4” didn’t work for me. After some math and experimentation I landed on either a) putting a 1/4” gap between each pass around the drum, which made it effectively like the 3” roll or b) cut the roll down to 2 1/2” and follow the rest of the steps in the manual just like it was a 3”.

I can’t be sure because I don’t have anything to compare it to, but if your sander is like mine you may need to trim the Abranet or work out a way that it will work for you. But the results are really good I’ve found. I still take light passes just like paper but I find the motor doesn’t bog down like it could sometimes with regular paper.

There might be some math to save the day but my understanding is the taper is basically matching the diameter of the drum. So you can’t mess with that too much, so it comes down to the width of the Abranet.

FWIW, they also sell it in 4 1/2”. You could cut it to 3” just like normal paper and still have a 1 1/2” strip that could be actually useful. The 1/4” that I’m cutting off the 2 3/4” is really just trash at that point.

Anyway, hope some of that helps!

Brad

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My sander is a Performax 22-44. The drum is 22" long x 16" circumference. Back of the envelope calculation says the strips at 2-3/4" wide need to be ~140" long. The Abranet roll is 10 yards long, yielding 2 full wraps with about 80" left over. I don't know what use I could get out of that much narrow abrasive. Kind of inefficient.

I think at 4-1/2" wide the strips would need to be 90" long. Amazon also has a roll that's 4-1/2" x 900". Coincidentally exactly 10 wraps. Much better, but also a much bigger investment - $118 for the roll. I think I'll use up my sandpaper first.

I don't understand why you had to cut down the 2-3/4" roll. Don't you just have to make the diagonal cut at the end long enough to go once all the way around the drum? I would have thought you could just lay the end of an old 3" strip on top of the new 2-3/4" strip with the outboard edges aligned and cut to match. You'd have to wrap the new strip around the drum to get the right length and then just do the same on the other end. But I haven't tried it. Maybe I'm missing something here.


I think If I had to cut the roll, that would be a non-starter for me. Seems Mirka would know better. Any of you with 22-44s had to do that?


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PostPosted: Tue Jan 09, 2018 2:59 pm 
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Abranet sounds like the way to go... its just the standard stuff you use?

What is the difference with abranet max?

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PostPosted: Tue Jan 09, 2018 3:02 pm 
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Looking forward to hearing more about the 22-44 OSC, Woodie...


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PostPosted: Tue Jan 09, 2018 7:08 pm 
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i second on the abranet. the best thing i´ve put on my drum sander. lasts forever. didn't´t have any problems with stretching.

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PostPosted: Tue Jan 09, 2018 7:14 pm 
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mqbernardo wrote:
i second on the abranet. the best thing i´ve put on my drum sander. lasts forever. didn't´t have any problems with stretching.
What grit are you using? Are you cutting out like Brad?

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PostPosted: Tue Jan 09, 2018 8:02 pm 
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Any width would would work on any drum so long as you know the cutoff angle on either end. If Abranet cared, they would provide templates. Or premark. Like klingspor paper does. It’s not rocket science. Well, it is math.


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PostPosted: Tue Jan 09, 2018 8:08 pm 
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You should not have to trim a roll. Here are some thoughts: http://www.sawmillcreek.org/showthread. ... nder-Paper

The string around the drum is the best idea

The idea is simple. Wrap a string around drum to get exact circumference. Place string on end corner of paper, stretch across till u intersect side. Mark. That line is ur taper on one end. Cut it. Put in drum sander and wrap to other end. Mark point on edge where paper starts going over edge. Remove paper. Use that mark and string to lay out taper on that end. Cut, reinstall. U are done. Random widths do not matter. Still, you’d think they would tell u this.


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PostPosted: Tue Jan 09, 2018 8:37 pm 
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"Random widths do not matter. Still, you’d think they would tell u this."

Until you go to put it into the tensioning clamp and find it's not where the end of the strip is. gaah



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PostPosted: Tue Jan 09, 2018 9:12 pm 
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Yeah, Mike. It’s not just cutting the tapers. Do the roll paper test and you’ll see what I mean.




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