The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
hermetic:
Another great save Andrew!
mattinker:
I've always been a bit jealous of your EDM machine!
Cheers, Matthew
awemawson:
It's saved my bacon several times Matthew :ddb:
So after lunch I cleaned up the entry to the first oil gallery with a suitably sized countersink, and then re-set the mounting to present the other two oil ports vertically above each other. I'm glad I went to the trouble of making that pivot, it makes life so much easier!
Then it was a case of 6 mm end mill to give a start for the drill on the curved surface, and drill it out to 52 mm deep with a short series HSS Cobalt drill.
The hole needs to be about 110 mm deep finally but I've gone as far as a short series is happy, and that with masses of ups and downs for chip clearance and adding lubrication. Long series cobalt drill is due by Wednesday and although I have several plain HSS ones, in light of the previous experience I'll wait until it comes!
awemawson:
Ade's kind gift of the sacrificial boring bar arrived this afternoon.
Same 32 mm diameter as mine but somewhat longer - glad to find that I have suitable tips in my stash of carbide :thumbup:
I gave it a bit of a clean up on the wire wheel and mounted it in a 32 mm VDI40 socket holder - note the the socket supports the bar for 85 mm and that I calculate that I need about 200 mm total length so I can shorten this one by about 175 mm.
Just for a laugh I mounted it up 'uncut', and naturally it vibrates like a goodun - we'll see what happens when shortened. If it still vibrates I'm going to surround it by a cast lead jacket, but that's for tomorrow.
awemawson:
I'm delighted to say the postman brought the long series 6 mm cobalt drills a day ahead of schedule, so I was able to press on and finish the last hydraulic oil gallery.
I must say that these M42 8% Cobalt Osborn drills make short work of this hard alloy steel.
Same process as before culminating in tapping for an 8 mm grub screw as a stopper and cleaning up with a countersink. It is a huge relief to have finished these long holes :ddb:
So what's left :scratch:
Just the taper profile for the A2-5 chuck to fit on, and also make a driving peg for it.
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