[modeleng] Re: Diamond Core Drills
- From: "Jeff D" <jeffdayman@xxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sun, 06 Apr 2008 22:29:28 +0000
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
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