Drilling a cross hole

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BobKellock - 29 Aug 2007 16:40 GMT

For reasons not relevant to this problem I'm making a new hub for the
steering
wheel of my old banger.

The steering column is made of 1" OD x .73" bore mild steel tube. The
part of
the light alloy hub that fits to the steering column is 1.5" OD and
bored 2.25"
deep as a light push fit onto the steering column. The hub and column
are cross
drilled 5/16", about the middle of the bore, nominally diametrically.
Flats are
machined on the OD of the hub for seating the nut and bolt (actually a
nice
snug fitting stud and two dome nuts) that clamp the hub to the column.

The cross holes are appreciably off centre so I need to drill the new
hub to
match the holes in the column but I don't mind having a bit of
clearance
between the end of the column and the bottom of the bore.

Any bright ideas?

Bob

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Don Young - 30 Aug 2007 04:25 GMT

> For reasons not relevant to this problem I'm making a new hub for the
> steering
[quoted text clipped - 21 lines]
>
> Bob

You might consider locating and drilling one hole as exact as possible, then
installing the hub with that hole aligned and drill thru for the second
hole. Another way would be to rotate the holes 90 degrees and just drill new
holes thru the whole thing.

Don Young (USA)

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Charles Ping - 30 Aug 2007 16:43 GMT

>For reasons not relevant to this problem I'm making a new hub for the
>steering
[quoted text clipped - 21 lines]
>
>Bob

Bob

One suggestion that I have is to make two concentric sleeves - one
that will slide over the column with a 1.5" OD and one that is an inch
or so larger. Slice the two rings in half, clamp a half on each over
the column and drill from the column cross hole through the two rings.
Dissemble, clamp the outer ring over the new hub and drill one of the
holes. Then you can mount the hub and column together and run the
drill through to the other side.

The other method depends upon the use of precision and measuring the
position of the hole relative to the side. And then replicating the
precision on a mill or drill. Makes the effort of making two
concentric sleeves seems sensible.......

c

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Model Forum / General / Models / August 2007

Drilling a cross hole