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Milling - Squaring An Inside Radius Of A Corner

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Peter Goodchild17/07/2023 10:00:22
10 forum posts
7 photos

What would be the approaches to doing this? All I could find was stuff about a Bridgeport slotting, shaper attachment.

Thanks.

Fulmen17/07/2023 10:06:09
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120 forum posts
11 photos

It can be done with a 45° mill if you can tilt the head 45° in both X and Y.

Gaz17/07/2023 10:29:49
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18 forum posts
16 photos

Finish with a file? Or use a boring head with a HSS with a 90 deg and broach it.

Andrew Johnston17/07/2023 11:17:12
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7061 forum posts
719 photos

There are a number of options:

1. Change the design so that a sharp internal cormer is not needed

2. Drill a hole centred on the intersection; then a milling cutter less than half the diameter of the drill will leave two edges that theoretically intersect at the desired point

3. Run the cutter beyond the edge in one direction to leave a semi-circular cutout

4. Use files, start with a square file and finish with a three square needle file to get a nice crisp internal corner

5. Use a slotting head, I happen to have one on the back of the Bridgeport smile

A slotting head is particularly useful for blind holes:

crosshead_slotting.jpg

Andrew

JasonB17/07/2023 11:42:02
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25215 forum posts
3105 photos
1 articles

Latest issue of ME has a good article on doing this using a slotting method with home made tooling

noel shelley17/07/2023 12:13:32
2308 forum posts
33 photos

The seldom mentioned shaper would do the job ? Noel.

HOWARDT17/07/2023 12:26:57
1081 forum posts
39 photos

Usually where two faces at 90 deg in a slot are needed to be in contact with another part either the internal corner is removed by pre drilling or milling out the corner or the external part has the corner removed sufficiently to allow full face contact.

Peter Goodchild17/07/2023 19:45:10
10 forum posts
7 photos

OK cheers.

John Ockleshaw 119/07/2023 02:51:38
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56 forum posts
7 photos

Hello Peter, This is a good job for a spark eroder even if it is a blind cavity

Nigel Graham 219/07/2023 08:37:31
3293 forum posts
112 photos

Peter -

Have you managed to complete the work by now?

It's occurred to me the simplest might just be to use a small-diameter cutter to reduce the corner radii to a minimum, then round the edges of the mating part.

Or use a small slot drill to overcut the corners a little, more or less as others suggest. The cutter needs only go slightly past both of the meeting faces, to create a small concave corner.

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