DeeJ Posted August 30, 2010 Posted August 30, 2010 Cut a long story short, i've snapped a fairing bolt inside my frame, the bolt is 5mm, stuck in about 4cm, it stainless steel, and the frame is made of aluminium.I have tried drilling with HSS Cobalt bits, but they just keep going blunt, and get nowhere.What drill bit will I need to drill out the stainless bolts, and is it easy to then tap out the hole to a slightly smaller size i.e, 6/7mm.If I can't get it all sorted by tomorrow afternoon, I will be using my rs125 with no fairings or nosecone at Donny, and I don't think that would be an enjoyable experience Quote
Guest Posted August 30, 2010 Posted August 30, 2010 can you get to the back of the bolt and undo it pulling it through?otherwise drill with a small drill and use an extractor, which has a reverse thread so cuts into the drilled hole and undo's as you turn...are you using a cordless drill, as some have less power than corded and this may be why your not cutting a nice pilot hole.. Quote
DeeJ Posted August 30, 2010 Author Posted August 30, 2010 can you get to the back of the bolt and undo it pulling it through?otherwise drill with a small drill and use an extractor, which has a reverse thread so cuts into the drilled hole and undo's as you turn...are you using a cordless drill, as some have less power than corded and this may be why your not cutting a nice pilot hole.. I've tried to get at the back of the bolt, but its seized in.Yes i'm using a cordless drill, tried my dewalt and milwaukee, and both have more torque than any of my makita corded guns.Only problem is I can't get anything to drill in to make a pilot hole, my old man says I will need a solid carbide drill bit but I can't find one from anywhere.I asked my local machine mart who said they know of no extractor bits that will cut into a stainless bolt. Quote
mealexme Posted August 30, 2010 Posted August 30, 2010 If they are proving hard to drill, how the hell did you snap it? I was thinking, failing drilling it, could you somehow cut a grove in it (depending on the tools you have) to put a screw driver into it? But i spose if it is too tough to drill, it will be too tough to cut.Is there any way of getting some mole grips onto them? (either back or front) I dont understand what you mean by the back is siezed. Try using WD40 and let it soke. I had to let it soke for a day or so trying to get a siezed bolt out me lawn mower and it came off easily. Quote
DeeJ Posted August 30, 2010 Author Posted August 30, 2010 If they are proving hard to drill, how the hell did you snap it? I was thinking, failing drilling it, could you somehow cut a grove in it (depending on the tools you have) to put a screw driver into it? But i spose if it is too tough to drill, it will be too tough to cut.Is there any way of getting some mole grips onto them? (either back or front) I dont understand what you mean by the back is siezed. Try using WD40 and let it soke. I had to let it soke for a day or so trying to get a siezed bolt out me lawn mower and it came off easily. there was 10mm pertruding through the other side of the frame, but I have tried mole grips on it but I think I may have cross threaded it putting the bolt in hence it was impossible to get out. i soaked it in plus gas from this morning and have been trying to get it out all day.I have just searched google and found that going at low rpm with plenty of cutting fluid using a left hand cut cobalt bit works. So going search for them tomorrow morning. Quote
FRHornet Posted August 30, 2010 Posted August 30, 2010 Plenty of Normal drill bits and plenty of coolant should do the trick... Lubysil/trefelex etc.. Quote
DeeJ Posted August 30, 2010 Author Posted August 30, 2010 I've just stole some cobalt drill bits from my mates workshop, and found some wd-40 if that will do the trick. Quote
DeeJ Posted August 30, 2010 Author Posted August 30, 2010 Jackpot, just found about 200 assorted drill bits, all HSS so I've got an endless supply of drill bits to use.I've got a busy day tomorrow.Hope I can tap it out easy though Quote
dex Posted August 31, 2010 Posted August 31, 2010 Drill slowly, if you drill fast you'll overheat the tip and blunt it. Slow speed, enough pressure so the tip bites (or you're polishing not drilling) and plenty of oil to cool and lubricate.You need to drill most of the way through so the EZ out can bite, if you don't drill deep enough you end up with a stainless bolt with a snapped EZ out stuck in it!Got any pics? Quote
DeeJ Posted August 31, 2010 Author Posted August 31, 2010 I've kinda done it.The bolt was impossible to get through even with solid carbide, and cobalt drill bits.So I ended up drilling just below the stainless pin into the alloy.Tapped it out to 6mm now and put a good quality pin in it. Also done the same on the same side to even it up. Quote
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