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Thread: So I now have a mini mill.

  1. #106
    Really Bored fingerpuk's Avatar
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    Default Re: So I now have a mini mill.


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    Tested the angle plate on the other five, perfect repeatability. Happy days. The drill chuck is useless though, so need to find a new one ideally keyless before I can drill.


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  3. #107
    Really Bored fingerpuk's Avatar
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    Default Re: So I now have a mini mill.

    Pictures of the newly milled ends.




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  5. #108
    Should Get Out Soon Screwdriver's Avatar
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    Default Re: So I now have a mini mill.

    I remember mentioning this technique, now we get to see it:



    Well, in the next episode anyway. Easy enough to Google the three plate technique for lapping in a flat surface but seeing it done (by Tom) is much more entertaining.

    S.

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    Default Re: So I now have a mini mill.

    Cross post. They look a lot better...

  7. #110
    Really Bored fingerpuk's Avatar
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    Default Re: So I now have a mini mill.

    I've been working in tool steel recently, making a few vice clamps. For a while I thought the mill was too weak to do it, but today I put a new end mill in and it cut like butter. For about 10 minutes, now it's rattling about like before. I have HSS end mills, cheap from eBay. When tools go off/blunt does this cause chatter? I've ordered a solitary carbide end mill to test that and see if it works any better.

  8. #111
    Should Get Out More Big Pete's Avatar
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    Default Re: So I now have a mini mill.

    yes, a dull tool will chatter. You also need to run all your tools at the right speed, especially if you aren't running coolant, the frictional heat will kill HSS in no time. Carbide will cope with much more heat, which means higher speeds for longer, but it's brittle, so you need to watch your feeds carefully and also be careful when you break out of an edge. replaceable tip milling cutters are the business, as you get at least 3 bites at the cherry out of an insert.

  9. #112
    Really Bored fingerpuk's Avatar
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    Default Re: So I now have a mini mill.

    Can you explain what you mean by break out of an edge? You mean when I leave the part? I've noticed that part seems harder, can't work out why.

    I'll try the carbide tool and see how it goes.

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    Default Re: So I now have a mini mill.

    leave or enter the part, you get an interrupted cut which is hard on cutters. Some carbides are unsuitable for interrupted cuts, some are fine, you need to check the spec when you buy them. I pretty much only use carbide on the lathe, or occasionally in the pillar drill.

  11. #114
    Really Bored fingerpuk's Avatar
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    Default Re: So I now have a mini mill.

    Hello.

    Wow! Night and day! Bought a corncob roughing cutter, solid carbide 10mm. And an 8mm finish cutter. I haven't tested the big one but the 8mm one cuts through this steel like it's made of sponge. It's incredible. I can even climb mill with it.

    I've only cut about 200mm through shiny silver steel and it already is losing it's edge, I get that it wont stay factory sharp for ever but after a few minutes? I cut with no oil. Speed was about 1200rpm and feed rate was about 50mm per minute by hand. I need a power feed!

    Order some more. New vice clamps and t nuts made so now it's time to build my first real project other than tools.

    Anyone got any advice on using a wiggler to find the edge? Do you wait until it isn't wiggling or until it flies off centre? I've heard both.

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    Should Get Out Soon Screwdriver's Avatar
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    Default Re: So I now have a mini mill.

    Wigglers are on the edge when they pop out.

    If I was paying good money for new cutters I'd be following the mfr recommended surface fpm, depth and feed rate.

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  14. #116
    Really Bored fingerpuk's Avatar
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    Default Re: So I now have a mini mill.

    My cutters are max 10 each and come with no suggestions :-)

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    Default Re: So I now have a mini mill.

    You know what they are made of and number of flutes, diameter etc. Should be easy to source the information.

    1200 RPM sounds very high. No idea what your feed rate is in real money, I'm still imperial.

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    Default Re: So I now have a mini mill.

    1350 is suggested to I guessed fairly near.

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    Default Re: So I now have a mini mill.

    I would have thought 1350 would be with flood coolant, which makes a very big difference. check the dry speed.

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    Default Re: So I now have a mini mill.

    I'll take some time to hunt for proper instructions.

    I made these today, the carbide tooling made it possible. They replace the bigger clamps I was using and will allow to vice to be held on the table.




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