Thanks to everyone and their advice to Clif. I am constantly amazed at the co-operative spirit here on this board and the absence of "flaming" one another. I asked a simple question on another board (that shall remain nameless) about the proper cutting lubricant to use on a specific job, and I was told to use "Mayonaise". Also, THANKS, Hubert, for the link to the new steam locomotive. Al --- Jeff D <jeffdayman@xxxxxxxxxxxx> wrote: > Hi Clif, > > I have used dimond core drills on steel. If you keep > the speed down they > work OK. If the speed gets too fast they start > flailing around chewing up > everything in their path. > > If you get no joy with them, you might try a tooling > supplier and ask them > for a hard steel drill or a solid carbide drill. If > you can get a left hand > helix one and turn it CCW (on stuck RH threaded > fasteners) it will drill > just like a regular twist drill in medium to hard > steel. The left hand helix > often helps release the stuck fasteners rather than > driving them further in > as the drill bites. > > I have to say too that I have had more trouble with > stuck, broken, rust > plugged and corroded Torx fasteners on cars than any > other type. Give me hex > head or hex socket head any day. > > Good luck, Jeff Dayman > > > >From: <clif.gwr@xxxxxxxxxxxx> > >Reply-To: modeleng@xxxxxxxxxxxxx > >To: <modeleng@xxxxxxxxxxxxx> > >Subject: [modeleng] Diamond Core Drills > >Date: Sat, 5 Apr 2008 19:57:00 +0100 > > > >Hi All, > >I have a problem with a bolt on my car. > > > >It was a Torx type star headed 10mm bolt which is > supposed to be tightened > >to a torque of 15 ft.lbs and is one of three > holding the pulley onto the > >power steering pump,. > >When I tried to undo it the torx tool simply ripped > the stars off leaving a > >round head. Just to make it worse it is typically > in a awkward place to > >get too and part of the design of these beasts is > that they flare out > >towards the base so forming their own washer. So I > am now left with a cone > >shaped disaster zone. > >Using a Dremel type slitting disc I formed a slot > in the remaining head and > >so far using screw driver blades that fit into a > 1/4" drive socket have > >sheared off four blades. I even tried heating it > up using a Micro > >blowlamp. > > > >From this it seems that it does not look as though > it is ever going to > >shift and so have hatched another plan. > > > >I intend to use a Diamond Core drill, as used for > drilling holes in very > >hard marble tiles etc. I have used these when > installing bathrooms. > > > >What I hope to do is place the core drill over the > pointed head of the bolt > >and grind my way down to the pully face hopefully > turning the bolt head > >into a stud. Thus I hope at least to be able get > the pulley off. > > > >I was hoping to put a thread on the resulting stud > and then put a nut onto > >it but there will not be sufficient clearance to > get a die down it. The > >pulley therefore is going to have just be held on > by the remaining two > >bolts with the stud just taking some of the drive > load. > > > >The Question is, has anybody any experiance with > using Diamond Core Drills > >to cut steel? > > > >Regards > > > >Clif > >MODEL ENGINEERING DISCUSSION LIST. > > > >To UNSUBSCRIBE from this list, send a blank email > to, > >modeleng-request@xxxxxxxxxxxxx with the word > "unsubscribe" in the subject > >line. > > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email > to, > modeleng-request@xxxxxxxxxxxxx with the word > "unsubscribe" in the subject line. > ____________________________________________________________________________________ You rock. That's why Blockbuster's offering you one month of Blockbuster Total Access, No Cost. http://tc.deals.yahoo.com/tc/blockbuster/text5.com MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.