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| Darren:
Ok, like I need it, I have started something new whilst I wait for some killer drill bits for my other ongoing project. I'm not going to tell you what it is for a change, be interesting how long it takes for someone to call it out. It's hard as nails, err, no that's not right. It's way harder than that. So I decided to make something that didn't need any threading....!! I wanted to do some milling, well I've wanted to do that for some time, but now I can :lol: I was really needing some larger stock, but this will have to do for now. No idea what it is/was, but it's heavy. Around 60mm dia. Chopped a piece off the end Tidied it up in the lathe, now the halfshaft I last used was hard, this was much harder...I'm talking a lot harder and it was right through as well. No soft core in this one. My band saw cut the halfshaft, it wouldn't touch this..... :dremel: Like the halfshaft material the finish was excellent, bit tough on the carbide tips though.... Next job was to drill it off center, 5mm in this case. Then bored to 28mm to a depth of 1,25", yes I know mixing measurements. Been around John too much :lol: Now to part it off, I got down to a 10mm core and tried to hacksaw as my parting tool wasn't long enough. All it did was make a scratch and take the teeth off the blade. Tried a new blade and it did the same thing. That's how I know it's hard to the core :thumbup: Anyways, I modified one of these into the parting tool above, That sorted it. The tough guy just melted when poked with this. Cleaned up the parted face and we have this, that's the lathe work done for now. Next stop the miller |
| Darren:
Cor, nobody guessed what it is yet? :lol: :lol: :lol: Better put some more pictures on then.... So now on the miller for some flatwork, those of you with keen eyes may spot the cutter has a tooth missing. A fair old chunk of it gone too. My old mill was good at doing that if you showed it some steel. Almost every time I used the thing :bang: HSS is never gonna survive cutting this lump so this carbide end mill was used. I do have a couple of good ones I could have used (thanks mate :thumbup:) However I was not going to chance them on this. One because is was a hard unknown material and two, because I'm used to breaking cutters :lol: So here we go, looking good so far, cutting very nicely.....so far........ Yep still cutting smoothly......fingers crossed.... AND IT'S STILL GOING SMOOTHLY....... :headbang: I'm not used to this.... And that's where I finished off tonight...... Considering how hard this metal is I think the miller is behaving very well indeed. Giving a really smooth finish, no snapped end mills and it's not even complaining... :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: |
| bogstandard:
Darren, I think this job would be a very good candidate for trying some coolant on it. I can almost guarantee the cutter will be well and truly knacked by the time you have finished. BTW, I think I now know why you were having so much trouble with the old mill. My guess is that it was an old imperial machine, and everyone knows that you should only put the cut on for metric cutters in mm instead of thous. The cutting angle was totally wrong for removing imperial chippings and so the cutters duly snapped off because the flutes got choked with imperial swarf. :lol: Bogs |
| bogstandard:
Darren, I have just reread the whole post, and by the looks of it, your bit of metal seems to be a drawbar or large pivot pin. If it is, then that will be some real tough material. Designed to take very high shear loads without bending or breaking. --- Quote --- yes I know mixing measurements. Been around John too much --- End quote --- Measurements are only there to give a guide to finished size. Use what you need until you get very close. These are imperial terms. Tweak - between 0.002" and 0.005" Gnat's cock - 0.0005" to 0.001" A 'sniff' or 'snifter' - 0.0001" to 0.0004" (as in 'a couple of snifters' - 0.0002") For metric, I suppose you translate the above to French. 'Il or Elle tweak' (verb, as in 'I tweaked a couple of thou off'), 'Un Gnats cock', has to be masculine, a lady gnat doesn't have one. Then 'Le sniff' masculine, 'La snifter' feminine, both have noses. :thumbup: Bogs |
| HS93:
I work in Ferkins , they come in units of two two ferkin big two ferkin small two ferkin heavey.. etc :ddb: :ddb: ooops that's me banned oh well it was good while it lasted peter :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: |
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