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Drill Guides
paulbeyer - 2/3/11 at 12:49 PM

Is there anyone out there with a lathe that could knock me up a couple of little drill guides please?

I have snapped two studs off of my exhaust manifold on my old Saab and need a couple of items turned to act as drill bit guides for a 3mm and 5mm cobalt drill bit as shown below. (I am going to need one with a 3.1mm dia. hole and the other with a 5.1mm dia. hole).




If someone can help I can paypal funds or send a cheque, whatever is best to cover your time, materials and p&p to Bristol.

Thanks.

Paul

Mr Whippy - 2/3/11 at 01:08 PM

If you file the end of the stud totally flat and then use a centre punch to mark the hmm centre you should have no difficulty getting a 5mm drill right down the middle of the stud. Keep gradually going up in size in 1mm steps till you are just under the thread internal diameter. Then you can clean out the old thread from the hole with a small nail or punch. With luck, WD40 and some blowtorch heat you should be able to clean out the hole without the need for retapping.

Just take your time

designer - 2/3/11 at 01:18 PM

That's what extractors are for.

Mr Whippy - 2/3/11 at 01:36 PM

quote:
Originally posted by designer
That's what extractors are for.


yeah but you still need to drill a hole for the extractor and tbh they are more likey to just snap leaving a very hard bit of metal in there that you can't even drill out

If there is about 10mm or more left of the stud still sticking out then you can heat it till glowing and leave it like that for about half an hour, hopefully that will break down the corrosion and it will come free

[Edited on 2/3/11 by Mr Whippy]

paulbeyer - 2/3/11 at 03:58 PM

The engine in a Saab is tilted at nearly 45 degrees like half of a V8 and the studs are not visible. The only way to access them is with a right angled drill attachment. These guides help you to locate the stud centre accurately without having to remove the head from the engine.