Peter Goodchild | 17/07/2023 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. |
Fulmen | 17/07/2023 10:06:09 |
![]() 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. |
Gaz | 17/07/2023 10:29:49 |
![]() 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 Johnston | 17/07/2023 11:17:12 |
![]() 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 A slotting head is particularly useful for blind holes: Andrew |
JasonB | 17/07/2023 11:42:02 |
![]() 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 shelley | 17/07/2023 12:13:32 |
2308 forum posts 33 photos | The seldom mentioned shaper would do the job ? Noel. |
HOWARDT | 17/07/2023 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 Goodchild | 17/07/2023 19:45:10 |
10 forum posts 7 photos | OK cheers. |
John Ockleshaw 1 | 19/07/2023 02:51:38 |
![]() 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 2 | 19/07/2023 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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