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| awemawson:
Blast it out with a die sinker edm machine |
| Trebor:
:ddb: --- Quote from: awemawson on August 21, 2013, 01:18:07 PM ---Blast it out with a die sinker edm machine --- End quote --- What's one of those ? |
| awemawson:
Electro Discharge Machining : EDM for short. A controlled electrical discharge is created between an electrode (that is usually copper or graphite) and the work piece, and the electrode holder is fixed on a servo controlled ram that lowers it into the material being cut. All this happens immersed is a dialectric fluid chosen to insulate so that the discharges happen above a critical voltage. Frequently used for forming the dies for press tooling hence the term 'die sinker edm' Process has the happy feature that you can cut precise shapes in very hard materials using easily shaped soft electrodes. Mine is a Eurospark H425 P25 like this one, but this one is just one I found on the web for you: |
| chipenter:
Drill a 20 mm hole in a piece of hex bar putt the brass bar in the hex with a set screw , set up some stops on the cross slide and drill the corners out , then drill the centre out mount a piece of tool steel in a four jaw chuck lock the head stock and use the saddle as a slotting tool . |
| hopefuldave:
--- Quote from: Trebor ---if it works I could end up doing 100s --- End quote --- If youll be.doing hundreds, definitely the rotary broach, it'll go like this: Face end - 5 seconds; Centre drill - 5 sec;I Drill to a/f diameter - 5 sec; Broach hex - 10 seconds Total 25 seconds cutting.. On a rotary table youll spend at least that long just cranking between positions! Drilling and filing (accurately) will take minutes per item just in go/no-go gauging. Broaching on a press... A press will cost 100 local currency units or more, the broach itself won't be cheap... The rotary broach holderr will take an evening in the shop to build, and you can grind the cutters any size and shape you like, evermore, so it's a good use of your time :) |
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