Gallery, Projects and General > How do I??

How do I machine a square hole?

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SPiN Racing:
Im a little fuzzy on the thing... so forgive me if I sound stupid LOL

In the Radio controlled aircraft I used to fly, I was doing pylon racing, pattern, and unlimited acrobatics.

For the tailwheel on the planes I flew, I usully ran the tailwheels (I ran two small ones side by side for stability of the assembly) with the vertical part bent out parallel to the rudder itself. I then actually ran a small pair of rubberbands from a hook on the rudder, to the "tiller" on the tailwheel. That allowed it to steer at low speeds and as speed increased it was less and less effective.

In the case of the block you have.. I think I understand the square shaft with the button sticking out...
If it were me.. and im understanding things correctly..

I would chuck a piece of rod, piano wire, drill rod, what have you.. in the lathe. Round the end of it.
Then I would drill the hole 90% deep.
Insert spring
Cut rounded bar short enough to compress the spring without binding, and then pop it into the hole.

Now.. granted.. I think I may be confused.. but thats what I would try.

bogstandard:
Spin,

Full sized, not models.

Bogs

SPiN Racing:
He he he Yes I figure it was full sized.. 

But I was thinking that a round pin would be as effective to exert pressure to keep the tailwheel aligned, and only in the extreme angle where pressure increased would it actually deflect..

John Stevenson:
Why not move the whole pin design up to the top of the block?
have a collar than clamps onto the spindle with an inverse shape of the cut away and then the pin can fit in a slotted collar round the outside and points inwards.

This way it doesn't weaken the spindle and the slotted collar can be milled to take the square key.

I can do a drawing if you can't follow it but that takes more time.

JS.

John Hill:
Ummm.... I was correctly identified as a 'bodger' on practically my first post here so with that in mind this is how I make square(ish) holes.

I first mark the corner and drill them with the smallest drill I have that will go through the thickness, I also mark the centre of the square (or rectangle) that is the point where diagonals cross and I drill another hole centred there and and large as I can up to the width of the required hole.  Then finish with a file though I assume the same process would be easy to finish with the piece of HSS tool steel as per the first(?) suggestion.

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