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Post by peterboat on Apr 13, 2017 21:50:29 GMT
My preference is for the flag discs last longer and seem to do a better job I start with wire brush first to get rid of paint and loose rust
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Post by Deleted on Apr 13, 2017 21:59:21 GMT
Nobody has mentioned scabblers yet. I've never tried one but they appear to be interesting.
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Post by phil70 on Apr 13, 2017 23:58:08 GMT
I've always used flap wheels, never used a poly wheel but they look interesting and will give one a go when I do my well deck this year Phil
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Post by Gone on Apr 14, 2017 11:53:16 GMT
If it is only a small area, say a foot or two square then a poly disc is great, but any bigger and you will spend a lot on discs. Flap wheels are good, but light pressure, low angle and keep it moving otherwise you will get grooves.
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Post by tonyqj on Apr 15, 2017 9:48:53 GMT
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Post by Jim on Apr 15, 2017 10:16:00 GMT
Ouch!Will give that perago a miss. If you ever have to cut metal up get some of the 1mm cutting disks, they are great. Throw that old hacksaw away!
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Post by tomten on Apr 15, 2017 18:42:44 GMT
These are amazing. See here for some cheaper options: tercoo-blaster.co.uk/mobile-shop/4570250689/click-here-for-individual-disks/3911976I'd recommend a three wheel disk for most applications, I have personally stripped the entire exterior of a 50'x10' Dutch tjalk. Yes, it took a while, but the end result was grit blasted perfection. At £69 the three wheeled disk is expensive, but I guarantee you it would cost more in any type of grinding disk. Assuming you know how to work the tool ( absolutely no pressure!) you will not damage teeth. I broke most of the teeth on my first one, before someone told me to take it easy, but happily invested in a second, which has still got 100% of it's teeth, despite doing three quarters of the hull, and most of the bilges as well. The other thing is that it is a very calm and relaxing power tool to use. Very little vibration, no pressure required, no massive movement needed, relatively quiet, not too messy... So, as long as you have a good working position, not at all tiring. Just remember: let the tool do the work. Literally tickle the paint and it will fly off.
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Post by tonyqj on Apr 15, 2017 20:18:12 GMT
I've got the single which is ok for bits and pieces and very small areas and I agree that there's nothing as good for the price.
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Post by tomten on Apr 16, 2017 8:38:11 GMT
I've got the single which is ok for bits and pieces and very small areas and I agree that there's nothing as good for the price. I also purchased a single, but found it tricky compared to the multiple disks... For those who haven't used or seen them, the roto blaster disks are rubber, with multiple carbide steel striking tips mounted on the edge. I think it's twelve. The way it works is that as it spins, each head in turn strikes the work piece, and as it does it is pushed back against it's soft rubber support. As the wheel revolves, the tip rebounds back out of the rubber, so that the next time it strikes the steel it does so with the combined force of the revolution and the rebound from the rubber. There are very specific operating speed requirements, which ensure that the tips are rebounding into the steel, and away from, which can happen if you go too fast or too slow. They don't function very well if held much off of 90 degrees, I think because the rebound into the rubber acts sideways. I think this is the reason I found the three disk so much easier to use than the single, it is quite obvious when you have three disks if you fall off from a right angle. The tool makes distinct scratches in the paint, and as you lose this right angle one of the three lines dissapeares. I found it most effective to work over any small angles (alongside rubbing strakes, for example), with a wire brush wheel on a grinder first, like cutting in with a paintbrush before rollering. Then I worked as close in to the corner as I could with the roto blaster, which is about 3mm or 4mm. The finish that the tool gives is slightly pock marked, just like grit blasting. It is a perfect key for applying paint to.
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Post by bargemast on Apr 16, 2017 13:03:31 GMT
I've got the single which is ok for bits and pieces and very small areas and I agree that there's nothing as good for the price. I also purchased a single, but found it tricky compared to the multiple disks... For those who haven't used or seen them, the roto blaster disks are rubber, with multiple carbide steel striking tips mounted on the edge. I think it's twelve. The way it works is that as it spins, each head in turn strikes the work piece, and as it does it is pushed back against it's soft rubber support. As the wheel revolves, the tip rebounds back out of the rubber, so that the next time it strikes the steel it does so with the combined force of the revolution and the rebound from the rubber. There are very specific operating speed requirements, which ensure that the tips are rebounding into the steel, and away from, which can happen if you go too fast or too slow. They don't function very well if held much off of 90 degrees, I think because the rebound into the rubber acts sideways. I think this is the reason I found the three disk so much easier to use than the single, it is quite obvious when you have three disks if you fall off from a right angle. The tool makes distinct scratches in the paint, and as you lose this right angle one of the three lines dissapeares. I found it most effective to work over any small angles (alongside rubbing strakes, for example), with a wire brush wheel on a grinder first, like cutting in with a paintbrush before rollering. Then I worked as close in to the corner as I could with the roto blaster, which is about 3mm or 4mm. The finish that the tool gives is slightly pock marked, just like grit blasting. It is a perfect key for applying paint to. Yes, you are right they have 12 pins per disc, so a triple has 36 pins that are very efficient.
I have received my third, the two previous ones were destroyed by friends that borrowed them, and that didn't listen to my instructions of letting the discs do the work, and never push on the machine.
This one won't be lent to anyone anymore, it will only be used by myself, and if all is well give me a lot of good service and live a long life.
Peter.
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