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Date:         Tue, 22 May 2018 20:23:47 -0700
Reply-To:     Mark Belanger <mbelanger@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mark Belanger <mbelanger@GMAIL.COM>
Subject:      Re: Success - Re: Trying to drill out bolt ...
Comments: To: thewestyman <zolo@foxinternet.net>
In-Reply-To:  <A42751AF2AF045BEBCA266210EAB3147@ZoltanHP>
Content-Type: text/plain; charset="UTF-8"

That's an understatement!

I that it was in the van still...

-MB

On Tue, May 22, 2018 at 6:17 PM, thewestyman <zolo@foxinternet.net> wrote:

> Fortunately it was still on the engine stand, thank the Lord. > Z > > -----Original Message----- > From: Alistair Bell > Sent: Tuesday, May 22, 2018 1:44 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: Success - Re: Trying to drill out bolt ... > > Hey Zoltan, knew you could do it. > > Drilling out old or broken fasteners is one of those hated jobs. Sometimes > it goes so smoothly and other times, often, it goes south. > > And double hard if your doing it on the van. > > Cheers > > Alistair > > On May 22, 2018, at 8:14 AM, thewestyman <zolo@foxinternet.net> wrote: >> >> Yes, finally have drilled and tapped the project. >> And it was an all day deal. >> Fortunately at Home Depot I found a set of Bosch drills 1/4 to 5/16 which >> was not for masonry but glass. It had Tungsten tips and correctly ground >> to sharp edge like ordinary drills. >> It did slowly cut into the broken in bolt and with a lot of patience I >> made it to the bottom end, with changing drill sizes as I progressed. Had >> to make sure, I don't slide off the center while it's progressing. >> Tapping was a little slow, but it was going all the way. >> >> Thanks to all who gave encouragement for this, especially Alistair. >> >> Forever yours, The List, >> Zoltan >> >> >> -----Original Message----- From: Alistair Bell >> Sent: Sunday, May 20, 2018 10:35 AM >> To: vanagon@GERRY.VANAGON.COM >> Subject: Re: Trying to drill out bolt ... >> >> Zoltan, >> >> Forgive me if I come across the wrong way here. You might already know >> this but I’ll say it anyway. >> >> If the drill bit does not cut into hardened material ( in your case it’s >> probably work hardened), ie no shavings right from the get go, then it >> will not cut. Stop, don’t just try pushing harder, you’ll just burn up the >> bit. >> >> >> Same thing if you are drilling successfully and then it seems not to drill >> , or requires more down force, stop. >> >> If the bit is at all dull, I mean not fresh out of the package or freshly >> sharpened, then it’s going to heat up and dull very quickly on hard >> material. It’s a progressive thing, slightly dull cutting edge makes >> friction and heat which makes the edge duller which makes more heat , etc >> etc. >> If good and sharp then this progression is less likely to occur. And of >> course cutting fluid really really helps. >> >> Cutting oil/fluid both cools and lubricates >> >> I’m going to assume you don’t sharpen your own bits , so if the bit don’t >> bite, try another fresh one. >> If indeed this bolt has been work hardened, once you penetrate that hard >> layer it should drill out fine. >> >> Use cutting oil. Almost any oil will do in a pinch. Even bacon fat is good >> with steel. WD-40 or kerosene with aluminum. >> >> And here’s a bit of a last resort. To get thru any hard layer. Use a small >> carbide tipped masonry bit. You know they type, they are everywhere. >> Couple of brazed on carbide cutters on the end of a twist drill. Get a >> small one and have at the bolt. It won’t be pretty but if might get you >> going into the softer metal. >> >> Good luck >> >> Alistair >> >> >> >> On May 20, 2018, at 8:36 AM, thewestyman <zolo@foxinternet.net> wrote: >>> >>> Alistair, >>> >>> Yes, I could make a nice center punch hole, yet I can't even start a >>> miniscule of shaving. And I have tried several small drills, 1/8 sizes. >>> Tried slow, fast. Did not use any cutting oil though. That might help >>> to start it. >>> I even heated it up, hoping that would make it softer. Probably made it >>> harder. >>> Last week I drilled one out without any trouble. >>> This cobalt drill does not have a grade written on it. >>> I think, there are 35 and 42 grades. >>> These are new drills, well ground, not pushing. >>> >>> Zoltan >>> >>> >>> -----Original Message----- From: Alistair Bell >>> Sent: Saturday, May 19, 2018 9:18 PM >>> To: vanagon@GERRY.VANAGON.COM >>> Subject: Re: Trying to drill out bolt ... >>> >>> What bolt is this? >>> >>> There are drill bits and there are drill bits. >>> >>> Cobalt by itself means little unless backed up by some numbers and a good >>> brand. >>> >>> If you can make a punch mark with a centre punch on the bolt, then you >>> can drill it. >>> >>> Start with small drill bit, use cutting oil, plenty. Does it bite? >>> >>> Sometimes you can work harden what you are trying to drill. Usually >>> that’s >>> because of dull bit, too fast, no cutting fluid. >>> >>> It happens in stainless sometimes. Swap out bit, try again slower. >>> >>> Alistair >>> >>> >>> On May 19, 2018, at 9:10 PM, thewestyman <zolo@FOXINTERNET.NET> wrote: >>>> >>>> Yup, trying but I can’t even start it, so hard. >>>> I have no idea what makes it hard like glass, but the cobalt drill won’t >>>> even start any shaving. >>>> This cobalt drill is from Home Depot. Maybe there is one harder than >>>> this. >>>> Anyone has an idea what to do? >>>> I have already installed the head, would not like to take it off. >>>> >>>> Best regards to the Great List, >>>> Zoltan >>>> >>> >>

-- ________________________________________________________________________ Mark Belanger - mbelanger@gmail.com


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