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Post by lollygagger on Dec 3, 2016 9:50:21 GMT
I love my 115mm angle grinder/slitting discs. I've hacked my way through thousands. Many have broken and hit me but not hurt me. They flex amazingly without breaking. I cut thin ply with them too and perspex and pretty well anything, but I remember what a worrying handful it was when I had my first go and rightly so. Safety advice Rule 1 : keep your face and neck out of line. Rule 2 : cut so that the rotation is pulling the grinder away from you and out of the cut. If you find you have to rearrange everything to achieve those, even if it's a pain and takes ages do it. If you have to turn the boat round, turn it round. After all that, for a grinder virgin, I'd go with the jigsaw advice if you can fit it in.
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Post by larkboy on Dec 3, 2016 9:50:46 GMT
I use angle grinders and abrasives every day at work and also have a selection at home. I would not recommend cheap angle grinders, we tend to use Bosch industrial and mainly I use 115mm one. We use Sait cutting discs which are 0.8mm thick and bloody excellent, I keep used ones of various diameters as the smaller ones can be used for cutting along curved lines. What sort of radius would the cut out be? It might pay to tack weld a tab onto the steel so you have a centre point, you could then use a decent hole saw if one is available in the right diameter. If you cut a square notch, drill the corners with a reasonable sized drill and then cut to the holes. This will prevent cracking from sharp corners.
edited to add: Please follow all the safety advice previously mentioned, especially safety glasses!
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Post by bodger on Dec 3, 2016 10:26:18 GMT
gorblimey guv, OP only wants to cut one notch in a bit of 50x4.
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Post by Deleted on Dec 3, 2016 10:30:39 GMT
gorblimey guv, OP only wants to cut one notch in a bit of 50x4. Ah, but what a notch it will be. With all this sound advice OP will look back at that notch over the years, knowing it was their very first with a smug knowing smile of satisfaction on their face! Assuming they don't cut right the way through and the motorbike ends up in the cut. That could be the final Cut (a Floyd album I could never get used to, in fact it got cut from my collection)
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Post by peterboat on Dec 3, 2016 10:41:59 GMT
We used to buy cheap grinders but now I paid a little more and bought a maketa fro, Toolstop I think much better grinder. The slitting discs were developed for stainless steel thin discs dont turn it blue with the heat thick discs do
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Post by larkboy on Dec 3, 2016 10:43:29 GMT
gorblimey guv, OP only wants to cut one notch in a bit of 50x4. This is true, but he may well use the grinder again in the future and will be able to feel more confident, hopefully...π Also, from personal experience, you can't overdo safety advice when it comes to angle grinders. When I was an apprentice I managed to get my finger caught between the guard and the grinding disc and it went halfway through my finger before I knew what had happened. One more piece of grinding advice...the Sparks generated stick to glass, they actually fuse to the surface as I found out when renovating my old series 3 Land Rover. Doing some cutting, the stream of sparks hit the windscreen and I had to replace itπ‘
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Post by lollygagger on Dec 3, 2016 10:44:17 GMT
Finger files are a great invention, safe and surpringly effective and useful. I might be tempted to nibble away with one on this notch.
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Post by Deleted on Dec 3, 2016 10:46:08 GMT
gorblimey guv, OP only wants to cut one notch in a bit of 50x4. This is true, but he may well use the grinder again in the future and will be able to feel more confident, hopefully...π Also, from personal experience, you can't overdo safety advice when it comes to angle grinders. When I was an apprentice I managed to get my finger caught between the guard and the grinding disc and it went halfway through my finger before I knew what had happened. One more piece of grinding advice...the Sparks generated stick to glass, they actually fuse to the surface as I found out when renovating my old series 3 Land Rover. Doing some cutting, the stream of sparks hit the windscreen and I had to replace itπ‘ Gazza mentioned this, see Braille Astra post. Thought he had an Ashtray for the blind at first, but then re-read it!
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Post by Deleted on Dec 3, 2016 10:59:39 GMT
Slitting discs are also great for cutting thick rope I've got an old Makita 7.2v grinder (low speed max 5000 rpm with a 100mm disc size. Fits in a jacket pocket and will slice through most things. No I am not a bike thief but its handy for lots of other things !!
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Post by bodger on Dec 3, 2016 11:05:24 GMT
Slitting discs are also great for cutting thick rope I've got an old Makita 7.2v grinder (low speed max 5000 rpm with a 100mm disc size. Fits in a jacket pocket and will slice through most things. No I am not a bike thief but its handy for lots of other things !! we'll believe you. .................................................... no, on second thoughts, why should we?
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Post by Deleted on Dec 3, 2016 11:06:38 GMT
Slitting discs are also great for cutting thick rope I've got an old Makita 7.2v grinder (low speed max 5000 rpm with a 100mm disc size. Fits in a jacket pocket and will slice through most things. No I am not a bike thief but its handy for lots of other things !! I might invest in one for this years Christmas turkey, lovingly burnt to a crisp by Mrs Rusty. Only joking honest ( in-case she ever reads this)
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Post by Deleted on Dec 3, 2016 15:17:37 GMT
I use angle grinders and abrasives every day at work and also have a selection at home. I would not recommend cheap angle grinders, we tend to use Bosch industrial and mainly I use 115mm one. We use Sait cutting discs which are 0.8mm thick and bloody excellent, I keep used ones of various diameters as the smaller ones can be used for cutting along curved lines. What sort of radius would the cut out be? It might pay to tack weld a tab onto the steel so you have a centre point, you could then use a decent hole saw if one is available in the right diameter. If you cut a square notch, drill the corners with a reasonable sized drill and then cut to the holes. This will prevent cracking from sharp corners. edited to add: Please follow all the safety advice previously mentioned, especially safety glasses! The only time a cheap nasty grinder scores is when you have to run it off a puny Genny! I kept a nasty one on the boat just incase a padlock or cabinet lock needs nipping off so I don't get held up. Not so much of an issue now I have the EU20 but a good grinder would make the Clarke cough!
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Post by smileypete on Dec 3, 2016 16:53:02 GMT
Wonder if Rick will have future use for a grinder or jigsaw? That might guide the way to go. Could just buy a Β£5 12" hacksaw and cut a shallow sided triangle with a hole first drilled where the apex will be, to make it look neater. The edge of the steel likely needs covering to protect the fork too, some split hose held on by a few cable ties would help. Spotted these tungsten carbide rod blades for Β£2 at toolstation, if they work well enough (may try first in the 'waste') might even be able to do a semicircle or at least do part of a slope sided rectangle (rhombus?), a normal blade can then do most of it: www.toolstation.com/shop/Hand+Tools/d10/Saw+Blades/sd1550/Tungsten+Carbide+Grit+Rod/p87521
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Post by smileypete on Dec 3, 2016 17:09:09 GMT
The only thing of theirs (Erbauer that is) that I do struggle with is the cordless jig saw - you have to attempt a circle to get a staight line... I must get around to taking that back. I wonder if you're using the cheap wavy type blades (supplied with the jigsaw?) which have a mind of their own. Bosch T101B 'taper ground' blades are a good all-rounder on wood, not cheap except the odd bargain on Ebay, but there are some cheaper equivalents: www.screwfix.com/p/erbauer-101b-wood-jigsaw-blades-pack-of-5/2851dLidl do a nice 'barrel' mains jigsaw for Β£25 but only comes round once a year mind...
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Post by Clinton Cool on Dec 3, 2016 18:20:29 GMT
How wide is the section to be removed, and how deep at it's deepest point? If I remember right Ricco has a Yamaha RXS 100, the stanchions are 30mm diameter, the legs will be around 45-50mm diameter. Depending where he needs to cut it will be at least 40mm wide, easily doable. It's a Suzuki GN125 but I did have one of those, minus the X, during my late teens! On reflection and having listened to all the advice on here I think the answer is to use the hacksaw I already have and make 2 cuts at 45 degrees to form a triangular notch. I still might buy the grinder, cut through the back mudguard and fix hinges to it so I can swing it out of the way to go through locks, rather than having to take it all apart.
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