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Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters. |
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#1
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
Hi Folks
I was hoping someone could help me out with a problem that I'm having with the Tim Skilton Premium Sanding Pads that are available at Lee Valley. I use the new wave sanding discs to finish my turnings. I can actually wear out the sandpaper with no problems on the lathe When I try to use this set up to sand my larger carvings and sculptures the sanding discs tend to loose their grip on the velcro sanding pad and come off. A sanding disc may last from 1min to 5min at the best. Once the sanding dics comes off that's it, it will not grip again. I thought it might be the wood dust building since it doesn't get thrown off as it does on the lathe. I used the shop vac but it still happens. I have tried new velcro, different sanding pads , even cut out a disc from my RO disc sandpaper but the problem still happens. This has being going on for over a year so I don't think it could be a bad lot of materials. There is a lot more stress being put on the discs while sanding on the lathe than there is on the carving. The only thing I can see being the problem is the velcro is made in a way that it needs both the disc and the work to rotate. Any suggestions would be appreciated. Thanks Peter I contacted Lee Valley about this and all they can do is offer and exchange or refund |
#2
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
burly pete wrote:
Hi Folks I was hoping someone could help me out with a problem that I'm having with the Tim Skilton Premium Sanding Pads that are available at Lee Valley. I use the new wave sanding discs to finish my turnings. I can actually wear out the sandpaper with no problems on the lathe When I try to use this set up to sand my larger carvings and sculptures the sanding discs tend to loose their grip on the velcro sanding pad and come off. A sanding disc may last from 1min to 5min at the best. Once the sanding dics comes off that's it, it will not grip again. I thought it might be the wood dust building since it doesn't get thrown off as it does on the lathe. I used the shop vac but it still happens. I have tried new velcro, different sanding pads , even cut out a disc from my RO disc sandpaper but the problem still happens. This has being going on for over a year so I don't think it could be a bad lot of materials. There is a lot more stress being put on the discs while sanding on the lathe than there is on the carving. The only thing I can see being the problem is the velcro is made in a way that it needs both the disc and the work to rotate. Any suggestions would be appreciated. Thanks Peter I contacted Lee Valley about this and all they can do is offer and exchange or refund I had a batch of New wave discs like that a couple of years back. Had to be careful, because if you don't see the disc fly off you ruin the pad in a few seconds. I think their velcro was not nappy enough on those. Is that a bad word? -- Gerald Ross Cochran, GA I hate laundry month. |
#3
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
"Gerald Ross" wrote in message ... I had a batch of New wave discs like that a couple of years back. Had to be careful, because if you don't see the disc fly off you ruin the pad in a few seconds. I think their velcro was not nappy enough on those. Is that a bad word? Only if you're Imus. Pete, try some of the Power-Lock type disks that don't rely on velcro to hold the cloth to the pad and glue to hold the cloth to the paper. They are extremely aggressive and long-lasting, so I would recommend the fully-backed only when sanding with the lathe on, though the flex edge can be used lathe off. I had the same problem with the gold-color velcros from Packard, though the green ones are excellent. |
#4
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
I tried some wave discs some years back and didn't think much about
them. I gather that you are power sanding. If they hold when you are sanding turning, then they should hold when you sand your sculptures. Not all pads and discs are compatable. The only thing I can think of is if you are sanding at a higher speed on your sculptures, than you are on your turnings. Higher rpms means more heat, and this can cause the disc backing and the hook backing to come off. I started sanding at lower speeds (I have a 1/4 inch piece of cork under the trigger on my drill, so speed is at 600 or so) and found I get a bit longer life from my discs. Also, there is no noticable time increase in completing the project. The heat can also melt the hooks on some pads. If the disc comes off and you keep sanding, the hooks are ruined. Had one batch of 150 grit discs where the backing came off almost every disc. Eventually the hooks will wear out and you need a new pad. I do put pads on the mandril as it is cheaper to replace the pads than it is to replace the mandril. If you are using firm pads, they will generate more heat than the softer ones, but make 120 grit cut like 80. My favorite discs come from VincesWoodNWonders. Blue discs on a plastic film. They are cut over sized (3 3/8 inch), and are slightly over 20 cents a piece, but you have to buy 50 of each grit at a time. They last longer than any others I have used. I haven't tried the 3M purple sanding discs that Mike Mahoney uses, but he says they are the best, and he goes through about $200 worth of abrasives a month. They are psa only, no hook and loop. I have some of the micro mesh and the green ceramic ones to try out next week to see how they compare. The Power lock discs are about 70 cents per disc, and I am too cheap for that. I have used a similar red aluminum oxide disc, and it was okay, but not great. robo hippy On Mar 2, 12:56*pm, "George" wrote: "Gerald Ross" wrote in message ... I had a batch of New wave discs like that a couple of years back. Had to be careful, because if you don't see the disc fly off you ruin the pad in a few seconds. I think their velcro was not nappy enough on those. Is that a bad word? Only if you're Imus. Pete, try some of the Power-Lock type disks that don't rely on velcro to hold the cloth to the pad and glue to hold the cloth to the paper. *They are extremely aggressive and long-lasting, so I would recommend the fully-backed only when sanding with the lathe on, though the flex edge can be used lathe off. *I had the same problem with the gold-color velcros from Packard, though the green ones are excellent. |
#5
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
"robo hippy" wrote in message ... I tried some wave discs some years back and didn't think much about them. I gather that you are power sanding. If they hold when you are sanding turning, then they should hold when you sand your sculptures. Not all pads and discs are compatable. The only thing I can think of is if you are sanding at a higher speed on your sculptures, than you are on your turnings. Higher rpms means more heat, and this can cause the disc backing and the hook backing to come off. No. Speed is not a player. Pressure makes heat. On odd contours there is a tendency to press harder, and at odd angles, should they be involved, there is no choice but to press to steady on the work, rather than the toolrest as is possible on the lathe. I sand my carvings with the flex edge where there's work to be done. Since the disk is on a flexible shaft, I don't have the weight of a drill motor or a clumsy grip to contend with. Allows a much lighter touch which preserves contour and paper. Where it's merely cleanup of oil from my grubby hands as I steadied while carving, I use the small flap disks or mops from Klingspor on the same flex shaft. They don't ruin contour. On very large or very small surfaces, I mount the sander on my JET buffer/sander and move the piece. Though I sand at 1725 shaft speed, I have carver friends that use 5K and above on their expensive flex tools as successfully. Make sure the sandpaper's rated for it! |
#6
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
On Mar 2, 11:19 am, burly pete wrote:
Hi Folks I was hoping someone could help me out with a problem that I'm having with the Tim Skilton Premium Sanding Pads that are available at Lee Valley. I use the new wave sanding discs to finish my turnings. I can actually wear out the sandpaper with no problems on the lathe When I try to use this set up to sand my larger carvings and sculptures the sanding discs tend to loose their grip on the velcro sanding pad and come off. A sanding disc may last from 1min to 5min at the best. Once the sanding dics comes off that's it, it will not grip again. I thought it might be the wood dust building since it doesn't get thrown off as it does on the lathe. I used the shop vac but it still happens. I have tried new velcro, different sanding pads , even cut out a disc from my RO disc sandpaper but the problem still happens. This has being going on for over a year so I don't think it could be a bad lot of materials. There is a lot more stress being put on the discs while sanding on the lathe than there is on the carving. The only thing I can see being the problem is the velcro is made in a way that it needs both the disc and the work to rotate. Any suggestions would be appreciated. Thanks Peter I contacted Lee Valley about this and all they can do is offer and exchange or refund Hello Pete, I contacted Tim Skilton concerning the problem you describe. Tim tried to get ahold of you, but could not reach you through your contact information given in your profile. He did copy me, however, so I am posting his reply he "I really don't have any solution to offer in this situation. The fact that Peter has no problem when using the Pads for their intended use, that is power sanding, leaves me wondering why there is a problem when used in a static situation. I would have thought the reverse might have been an issue as I would have thought there would be more heat generated in Power Sanding. I would really need to see the application to offer any specific advice. Generaly the problem of the pad/abrasive losing grip is caused by heat, The little hooks on the velcro tend to straighten out when excessive heat is generated. The other advice I can offer is to use as larger pad as possible. The larger pad has a greater surface area to absorb heat, this translate into longer life for the velcro. I hope this helps. Please let me know. Tim Skilton" I hope this may help you. Fred Holder http://www.fholder.com |
#7
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
"Fred Holder" wrote in message ... The other advice I can offer is to use as larger pad as possible. The larger pad has a greater surface area to absorb heat, this translate into longer life for the velcro. I'm going to dissent here too. The greater radial velocity on edge of the larger disk results in a greater "kick" against the tool providing the power, and the hand holding that tool. The natural response to this perceived loss of control is to bear down, which puts greater stress on the velcro hold and results in greater heat. On those occasions where I resort to coarser grits, I will only use smaller diameter disks because the combination of greater grab and greater speed makes them too difficult to control. |
#8
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
On Mar 3, 9:27*am, "George" wrote:
"Fred Holder" wrote in message ... The other advice I can offer is to use as larger pad as possible. The larger pad has a greater surface area to absorb heat, this translate into longer life for the velcro. I'm going to dissent here too. *The greater radial velocity on edge of the larger disk results in a greater "kick" against the tool providing the power, and the hand holding that tool. *The natural response to this perceived loss of control is to bear down, which puts greater stress on the velcro hold and results in greater heat. On those occasions where I resort to coarser grits, I will only use smaller diameter disks because the combination of greater grab and greater speed makes them too difficult to control. |
#9
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
George,
I will disagree on heat factors. Heat is caused by both pressure and speed. The same amount of pressure at two different speeds will generate different heat factors. Identical pressures at slow and high speeds will also yield different heat factors. At very low speeds, it is almost impossible to generate heat except under very high pressure. Both speed and pressure factor into how much heat is generated. robo hippy On Mar 3, 9:27*am, "George" wrote: "Fred Holder" wrote in message ... The other advice I can offer is to use as larger pad as possible. The larger pad has a greater surface area to absorb heat, this translate into longer life for the velcro. I'm going to dissent here too. *The greater radial velocity on edge of the larger disk results in a greater "kick" against the tool providing the power, and the hand holding that tool. *The natural response to this perceived loss of control is to bear down, which puts greater stress on the velcro hold and results in greater heat. On those occasions where I resort to coarser grits, I will only use smaller diameter disks because the combination of greater grab and greater speed makes them too difficult to control. |
#10
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
"robo hippy" wrote in message ... George, I will disagree on heat factors. Heat is caused by both pressure and speed. The same amount of pressure at two different speeds will generate different heat factors. Identical pressures at slow and high speeds will also yield different heat factors. At very low speeds, it is almost impossible to generate heat except under very high pressure. Both speed and pressure factor into how much heat is generated. robo hippy You disagree with the physicists. To the extent that the coefficient of friction may change by retaining dust under the pad, there may be slight differences, though the greater radial velocity will have a net clearing effect over the slower. http://www.school-for-champions.com/...n_equation.htm Consider the folks who use pneumatic tools operating at 15K and higher, or the standard orbital sander which operates in the 10-15Kopm range. They only get in trouble when they press, which increases the friction in the standard equation as well as developing additional friction due to deformation of the material and its holder. That's why they tell you to use only the weight of the sander to hold it to the work. |
#11
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
On Mar 3, 2:22 pm, "George" wrote:
"robo hippy" wrote in message ... George, I will disagree on heat factors. Heat is caused by both pressure and speed. The same amount of pressure at two different speeds will generate different heat factors. Identical pressures at slow and high speeds will also yield different heat factors. At very low speeds, it is almost impossible to generate heat except under very high pressure. Both speed and pressure factor into how much heat is generated. robo hippy You disagree with the physicists. To the extent that the coefficient of friction may change by retaining dust under the pad, there may be slight differences, though the greater radial velocity will have a net clearing effect over the slower.http://www.school-for-champions.com/...n_equation.htm Consider the folks who use pneumatic tools operating at 15K and higher, or the standard orbital sander which operates in the 10-15Kopm range. They only get in trouble when they press, which increases the friction in the standard equation as well as developing additional friction due to deformation of the material and its holder. That's why they tell you to use only the weight of the sander to hold it to the work. Hi Guys Just wanted to add a bit more info to my original post. To the lad who contacted Tim Skilton. Last year I had the problem happening on the lathe also. Lee Valley sent out replacements. I noticed the grit size stamp and package was different as if they might have a problem. Last week it wasn't happening on the lathe only on the carvings. To the rest who have helped. I would have to say my lathe work experiences quite a bit more pressure and heat since I can lean into it. My carving was held between my knees and I could not bear down. The pads were coming off before any heat could be generated. Thanks again Peter |
#12
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
"burly pete" wrote in message ... To the rest who have helped. I would have to say my lathe work experiences quite a bit more pressure and heat since I can lean into it. My carving was held between my knees and I could not bear down. The pads were coming off before any heat could be generated. You weren't catching the raggedy edges, were you? That'd do a number on the backing, and ultimately on the hooks of the velcro. Wouldn't be the first guy to catch and throw one on a rough spot. |
#13
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
George,
You don't have to use sand paper to proove it, use your hand, and feel the heat differences generated at different speeds and different pressures. robo hippy On Mar 3, 1:38*pm, burly pete wrote: On Mar 3, 2:22 pm, "George" wrote: "robo hippy" wrote in message ... George, I will disagree on heat factors. Heat is caused by both pressure and speed. The same amount of pressure at two different speeds will generate different heat factors. Identical pressures at slow and high speeds will also yield different heat factors. At very low speeds, it is almost impossible to generate heat except under very high pressure. Both speed and pressure factor into how much heat is generated. robo hippy You disagree with the physicists. *To the extent that the coefficient of friction may change by retaining dust under the pad, there may be slight differences, though the greater radial velocity will have a net clearing effect over the slower.http://www.school-for-champions.com/...n_equation.htm Consider the folks who use pneumatic tools operating at 15K and higher, or the standard orbital sander which operates in the 10-15Kopm range. *They only get in trouble when they press, which increases the friction in the standard equation as well as developing additional friction due to deformation of the material and its holder. *That's why they tell you to use only the weight of the sander to hold it to the work. Hi Guys Just wanted to add a bit more info to my original post. To the lad who contacted Tim Skilton. Last year I had the problem happening on the lathe also. Lee Valley sent out replacements. I noticed the grit size stamp *and *package was different as if they might have a problem. Last week it wasn't happening on the lathe only on the carvings. To the rest who have helped. I would have to say my lathe work experiences quite a bit more pressure and heat since I can lean into it. My carving was held between my knees and I could not bear down. The pads were coming off before any heat could be generated. Thanks again Peter |
#14
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
"robo hippy" wrote in message ... George, You don't have to use sand paper to proove it, use your hand, and feel the heat differences generated at different speeds and different pressures. robo hippy Sorry, follows the physical laws here. Must be the latitude. |
#15
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
Hands on is physical. Can't explain the physics of it, but try it.
robo hippy On Mar 4, 3:06*am, "George" wrote: "robo hippy" wrote in message ... George, You don't have to use sand paper to proove it, use your hand, and feel the heat differences generated at different speeds and different pressures. robo hippy Sorry, follows the physical laws here. *Must be the latitude. |
#16
Posted to rec.crafts.woodturning
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Problem with Tim Skilton Premium Sanding Pads
Sounds like too agressive sanding to me. The Velcro hooks melt quite easily
and when that happens they're done.............Ralph "burly pete" wrote in message ... Hi Folks I was hoping someone could help me out with a problem that I'm having with the Tim Skilton Premium Sanding Pads that are available at Lee Valley. I use the new wave sanding discs to finish my turnings. I can actually wear out the sandpaper with no problems on the lathe When I try to use this set up to sand my larger carvings and sculptures the sanding discs tend to loose their grip on the velcro sanding pad and come off. A sanding disc may last from 1min to 5min at the best. Once the sanding dics comes off that's it, it will not grip again. I thought it might be the wood dust building since it doesn't get thrown off as it does on the lathe. I used the shop vac but it still happens. I have tried new velcro, different sanding pads , even cut out a disc from my RO disc sandpaper but the problem still happens. This has being going on for over a year so I don't think it could be a bad lot of materials. There is a lot more stress being put on the discs while sanding on the lathe than there is on the carving. The only thing I can see being the problem is the velcro is made in a way that it needs both the disc and the work to rotate. Any suggestions would be appreciated. Thanks Peter I contacted Lee Valley about this and all they can do is offer and exchange or refund |
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