Daniel,
Google "Tap Drill Sizes" and you'll get more answers than you ever wanted.
Larry
----- Original Message -----
From: <Daniel1312@aol.com>
To: <spridgets@autox.team.net>
Sent: Tuesday, June 13, 2006 3:34 PM
Subject: Drills, taps and hardware
Hi List,
Collected my hybrid bellhousing today. This is to fit a Ford type Nine 5
speed gearbox onto the back of an A-series engine. The bellhousing in the
car is
an earlier fabricated bellhousing that the casting will replace.
I've some jobs to so on the casting including drilling and tapping 3 quarter
UNF holes for the starter motor cover (will be blanked off since the car
uses
a pre-engaged.
SO, what size drill do I need if I'm going to tap a quarter UNF?
Secondly, the bellhousing has a steel bracket that takes the clutch fork and
this screws into the bellhousing with a pair of metric M6 Allen caps. I'd
like to not only Loctite these 2 bolts into the casting but I'd like to
lockwire
them to the pivot bolt for the clutch fork (I realise this is overkill). I
can't drill the bolt heads without a drilling jig (my jig is imperial not
metric) and Allen caps are a sod to drill anyway.
SO, I don't suppose I can just run my quarter UNF tap down the metric M6
thread and get away with it can I (I know it's shameful even to ask)?
OR anyone have a source for drilled head metric hardware - Aircraft spruce
only does imperial stuff?
Thanks
Daniel
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