shaping disk has wobble
-
- Posts: 112
- Joined: Wed Aug 12, 2015 9:42 pm
- Location: Galax, Virginia
- Contact:
shaping disk has wobble
hey guys my shaping disk has some pretty bad wobble to it It is a 7 inch gator grinding disk backer pad and I am just using 36 grit fiber sanding pads from lowes. the sanding pads are always curved when i get them and I am guessing this is what is causing the wobble. I think the fiber disks have actuallu bent my grinder backing pad out of shape. I was just wondering if you guys have the same problem and if a better brand of sanding pads or backing would help. thanks
- sandahlpipe
- Posts: 2106
- Joined: Mon Feb 04, 2013 8:49 pm
- Location: Zimmerman, MN
- Contact:
Re: shaping disk has wobble
My sanding pads needed to be clamped to a flat surface for a day before I could use them. After a day or so of clamping to a flat surface, there was only a little bit of wobble, which has fixed itself with use. Also, to get them to work on the arbor of my motor, I machined a bushing to eliminate the wobble.
-
- Posts: 112
- Joined: Wed Aug 12, 2015 9:42 pm
- Location: Galax, Virginia
- Contact:
Re: shaping disk has wobble
Alright so there will always be a little bit of wobble?
watching videos and stuff of people shapping it always looks like there disks are spinning so true, but maybe its justbecause they are moving faster. I also have my sanding disk going at about 1750 rpm should i speed it up?
watching videos and stuff of people shapping it always looks like there disks are spinning so true, but maybe its justbecause they are moving faster. I also have my sanding disk going at about 1750 rpm should i speed it up?
- sandahlpipe
- Posts: 2106
- Joined: Mon Feb 04, 2013 8:49 pm
- Location: Zimmerman, MN
- Contact:
Re: shaping disk has wobble
My disc runs true after the clamping and a couple hours of use. 1750 is a fine speed to work with.
-
- Posts: 112
- Joined: Wed Aug 12, 2015 9:42 pm
- Location: Galax, Virginia
- Contact:
Re: shaping disk has wobble
Alright sounds good ill try that. What kind of disk are you using
- sandahlpipe
- Posts: 2106
- Joined: Mon Feb 04, 2013 8:49 pm
- Location: Zimmerman, MN
- Contact:
Re: shaping disk has wobble
I'm using the Harbor Freight version. I wouldn't assume it's anything different than what you have except for the bushing I made.
- oklahoma red
- Posts: 1084
- Joined: Tue Apr 12, 2011 6:14 pm
Re: shaping disk has wobble
Usage will help flatten it. Use a chunk of hard wood and bear down on it against the disc. That will get it hot. Get some small clothes-pin type clamps and use them around the perimeter of the disc when you aren't using it. This will help keep it flat.
Re: shaping disk has wobble
I made my backing disk from aircraft aluminum. I just use a washer and spray adhesive to keep my sanding disk/wood chipper in place. Don't have to flatten the disk. 1/8" sheet doesn't even know the disk is adhered to it.
Andrew
www.andrewstaplespipes.com
www.andrewstaplespipes.com
- oklahoma red
- Posts: 1084
- Joined: Tue Apr 12, 2011 6:14 pm
Re: shaping disk has wobble
Is your disc tapered or flat? Surgery on the sanding sheet is normally required if the disc is tapered.andrew wrote:I made my backing disk from aircraft aluminum. I just use a washer and spray adhesive to keep my sanding disk/wood chipper in place. Don't have to flatten the disk. 1/8" sheet doesn't even know the disk is adhered to it.
-
- Posts: 3121
- Joined: Sun Sep 02, 2007 4:29 am
- Location: Kansas City, USA
- Contact:
Re: shaping disk has wobble
For you carvers who really want to get after it, pick up Tim West's 7" high-speed-rated & balanced Briar Evaporator:
http://www.jhlowe.com/machine_parts.htm
It's counterintuitive, but the faster a disc spins the less resistance--"tugging"--there is of the work. At 5000+ rpm, it's like passing a block into a science fiction "disintegration field". Whatever enters simply disappears.
As for how to spin one that fast with your current motor, just rig a belt /pulley multiplier.
http://www.jhlowe.com/machine_parts.htm
It's counterintuitive, but the faster a disc spins the less resistance--"tugging"--there is of the work. At 5000+ rpm, it's like passing a block into a science fiction "disintegration field". Whatever enters simply disappears.
As for how to spin one that fast with your current motor, just rig a belt /pulley multiplier.
UFOs must be real. There's no other explanation for cats.
Re: shaping disk has wobble
+1LatakiaLover wrote:For you carvers who really want to get after it, pick up Tim West's 7" high-speed-rated & balanced Briar Evaporator:
http://www.jhlowe.com/machine_parts.htm
It's counterintuitive, but the faster a disc spins the less resistance--"tugging"--there is of the work. At 5000+ rpm, it's like passing a block into a science fiction "disintegration field". Whatever enters simply disappears.
As for how to spin one that fast with your current motor, just rig a belt /pulley multiplier.
I use a 36 grit 7 inch wheel at my lathe's top speed (which is "only" 4000 rpm) and I find it to be smoother and much more precise than at lower speeds. Also, at that speed a slight wobble actually becomes a non issue and tends to all but magically disappear.
Ryan Richardson
R2 Pipes/Ryan's Luxury Goods
______________________________________
"You can't convince a stupid person that what he's doing is stupid, because the stupidness inside him is telling him that it's smart"
R2 Pipes/Ryan's Luxury Goods
______________________________________
"You can't convince a stupid person that what he's doing is stupid, because the stupidness inside him is telling him that it's smart"
Re: shaping disk has wobble
For a many years now I have done all my shaping at 3000rpm, to being with just because it was convenient but now I much prefer it. You need a steady hand and practice though as at 40 grit the wood disappears fast!
Re: shaping disk has wobble
I remember way back somebody (Rad, maybe?) said to wet it and then glue it on. Haven't tried it myself, but worth the try.
-
- Posts: 112
- Joined: Wed Aug 12, 2015 9:42 pm
- Location: Galax, Virginia
- Contact:
Re: shaping disk has wobble
I actually just turned mine up to about 3000 rpms and the first time I touch the wood to it the sanding disk is pulled right up against the backing pad and the wobble is pretty much gone
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
Re: shaping disk has wobble
It's like the difference between whittling with a dull knife versus a sharp one. Counterintuitive maybe, but there's much more control, you don't have to press as hard, things are less likely to grab and slip etc. Glad you got it sorted.
Ryan Richardson
R2 Pipes/Ryan's Luxury Goods
______________________________________
"You can't convince a stupid person that what he's doing is stupid, because the stupidness inside him is telling him that it's smart"
R2 Pipes/Ryan's Luxury Goods
______________________________________
"You can't convince a stupid person that what he's doing is stupid, because the stupidness inside him is telling him that it's smart"