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Nick
Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
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Hi Glen. I cant quite remember the filing, but I probably used a technique called "draw filing'. You use a fine file, put it on the material edge at 90 degrees (like you were going to file it the usual way), then you draw the file along the material edge without letting it move from side to side.
I hold the file at both ends and only use a light downwards pressure. You will get longer, stringy plastic filings with this method and a brushed look on the material. you can round the edge a bit by tilting the file either way, but it doesn't work so well on a sharp edge.
Withthe disk cutting, you could be holding the disk at an angle off 90 deg. to getthe wider cut, but its probably cause its taking so long to make the cut.
It sounds like you are grinding the steel away rather than cutting it - the less material in contact with the blade at any point the faster the cut. It might not be the right way to do it, but I try to keep the disk cutting thru the steel like a circular saw cuts thru a thin sheet. All the action is going on at a very small point and the saw teeth are passing thru the sheet at around 90 deg. to the sheet. that makes it sound harder than it really is - I could show you in about 10 seconds. Also, you need to apply a fair amount of pressure. If the angle grinder isn't slowing down a bit, its not cutting as hard as it could. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
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Thu Oct 07, 2004 4:38 pm |
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Nick
Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
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Wish I had a web cam to show you what I can't describe properly . The 'flick' problem sure is scary, but can be avoided for most cuts (anyone know what the proper term is?) When you are making a cut thru thin material its always best to cut with what I would call the trailing side of the disk. If you relaxed your grip, the grinder would push itself OUT of the cut and away from you. When you accidentally move the cutting point past the top of the disk and onto the leading side, you can get the disk trying to make a supper aggressive cut, grabbing the material and then flinging the job, the grinder, or you all around the room!
That's too many words describing a simple thing, so the short advise would be to cut so you have so the grinder wants to pull away from you and you have to pull it towards yourself to keep it cutting. That way, if the grinder grabs, it flys away from you and on one gets hurt.
Not sure I understand the wobbling problem - could it be you have disks with too large a mounting hole? My old grinder has a small spindle and when i accidentally buy a disk with a larger bore, I cna never thighten the grinder up enough to keep the disk spinning on center. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
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Thu Oct 07, 2004 5:27 pm |
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