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| Making a Milling tool Arbor |
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| Darren:
Well enough bodging and showing bits of welded up scrap, time to do some precision work :thumbup: I have an index milling cutter but no arbor, can't find it on the manufactures web site either. So I thought I'd make one after seeing Bogs today it reminded me :thumbup: http://i202.photobucket.com/albums/aa102/bogstandard_photos/Swingup08.jpg I mentioned some bar stock I recently sourced elsewhere http://madmodder.net/index.php?topic=2328.0. This turned out to be no ordinary steel, it was pretty tough stuff. Can't cut it with the mechanical hacksaw or the bandsaw. Can't drill it with HSS either, though Cobalt drills were ok. Because I couldn't saw it I had to part it on the lathe instead Cept my parting tool couldn't go deep enough :doh: Where there's a will ..... :) Now I had a shorter piece I needed to turn one end to 20mm, largest that will fit in an ER32 collet on the mill. Oops, it got a bit hot ... :ddb: There, that's better Turned around and fashioned a bit. I need a 16mm x 1.5 thread to fit the tool ..(the flash makes it look rough, it wasn't really) Changed the change wheels on the lathe and here we are, a thread, better still it's the right size too .... :) And here's the tool. Now I don't want the centre of the tool to butt up to the arbor, rather I want the outer 50mm diameter to take the load and stresses. It'll be more stable that way. A little bit later and it's well on its way This spacer needs to be true and parallel on both faces, this is important or the cutter will wobble. Meaning all drilling, boring and facing of both sides needed to be done without removing it from the chuck. Here you can see I have done most of the work and almost parted it off, but not quite. I needed to face it first and at the same time finish parting. Notice I have left side clearance to allow the swarf to escape during my final facing/parting .... :smart: And here we are, this is the parted face I wanted these parts to lock together as much as possible for rigidity. Notice the boss on the tool and the arbor fit into the spacer. The final result, the spacer was pressed onto the tool on the press and the arbor is a very close fit. Because of the thread everything will only ever tighten up in use. In fact if it ever needs removing it'll probably have to be machined off !! I think my new lathe works :ddb: :ddb: :ddb: |
| dsquire:
Darren Very impressive. I can just about imagine the big smile on your face as you are making this. It's nice to have a machine that you can get serious with and get results without always having to back off. :ddb: :ddb: Cheers :beer: Don |
| AdeV:
Darren, that's a fascinating looking cutter. In use, is it like a giant end-mill? Can you share where you got it from, or was it a lucky one-off find? I'm loving your arbor too. Looking at pic 5, the one below the overheated bit, it looks like a really glassy smooth finish. In reality, is it that smooth? I'm finding I just can't cut a piece to be completely "baby's bum" smooth; there's always a very faint pattern on it & if I run my thumbnail along the length, you can feel a certain roughness. Not sure if it's me, or if I'm chasing a finish that's impossible. I'm currently using carbide tooling on mystery metal, FWIW. :thumbup: |
| sbwhart:
Well that was a good job well done Darren, :clap: :clap: :clap: :clap: A good try out for your new lathe that ended up with a real beast of a cutter for your mill:- great stuff :thumbup: Have fun Stew |
| bogstandard:
Very nicely done Darren. I would think that cutter could be classed as a mover, it just moves metal out of the way. Looks a bit pricey to retip though. John |
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