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Thread: Machinist's / hobby machinist's

  1. #1
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    Machinist's / hobby machinist's

    I'm a very amature hobby machinist, early stages of learning to run a lathe and mill. I have noticed quite a few hobby machinists etc on this forum, its probably somthing in gun owners personality that attracts them to building things, its the same as motorcycles, i have noticed many people that shoot also ride.

    Any way, is there a nz based forum or Facebook group that people use, I have come accross lots of overseas stuff but it would be great to discuss things with local people to see where people are getting supplies etc, most forums just point you to American websites and there freight charges are just over the top.

    Also does any one know where I can get a backplate for a 5 or 6 inch chuck for a 9x20 lathe, it has the M39x4 spindle thread, I emailed machinery house who I got it from, but they were not to helpful, I could machine it myself but I believe I need to make it from cast iron and I have no idea where to get a piece that size.

    Cheers
    Russell

  2. #2
    Just like Mimms the First
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    Backplate doesn't need to be cast. Indeed, machine it.

    No help on the forums. Was on a couple international ones but they changed software/layout which now looks and handles like shyt so gave up. Homeshop Machinist comes to mind.

  3. #3
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    What supplies do you need that you can't find? most towns will have an engineering shop or two.

  4. #4
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    Good place for supplies https://www.carbidenz.co.nz/

  5. #5
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    I have always managed to find what I need, but feel like I'm paying a fair amount as Im not in that trade, Im just curious if there are better places around to get stuff, places that are setup better for hobbiest types , obviously you can get the real cheap stuff from China, which for one off jobs has worked. Are most people using expensive quality stuff from engineering shops or is there a middle ground?

  6. #6
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    when you say "stuff"... ?

    Learn HSS. Well cheaper than insert tooling and better to learn on.

    I get steel through fletchers in whg, they do the 4140 grade by the meter that's generally (probably?) what you want, but the have all the 10xx and anything else you want. Their RHS and mild steels are by the length though. Many fab shops around town will sell you cuts out their scrap bins.

    Tools through bindons or donnovans. They know me by sight so I get better than mug's deal, but not quite trade. Inserts from donnovans, always the sandviks or kyocera, mitsubishi.
    Chinese shit isn't worth pissing around with.

    I only ever buy things that I expect my grandkids to inherit. Not at all into the throway culture. Quality is rememberd after price is forgotten, and so on.
    40mm likes this.

  7. #7
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    Cool didn't know fletcher would sell by the m, I used to go donavans but since they moved I have been going to bindons.
    I'm trying to go hss, I use some cheap carbide bits but want to set myself up for hss better. Things like tool holders and I want to get a 4 jaw chuck, bits like that are you looking through engineering shops or more like machinery warehouse, I have bought all my lathe specialised stuff through them but I'm thinking allot of the tooling/chucks is just the stuff we see on the ali baba website rebranded.

    The Chinese end Mills that came with my mill/drill are pretty rubbish, I have only used them on aluminium and you can already see they are not really concentric.

  8. #8
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    Sparey's book on the amatuers lathe is good value. A cheap 16mm set of TC insert tooling is offered on TradeMe which is perfectly useable. I keep a good stock of HSS which is good to grind into form tools as required. A QC toolpost with a clump of extra tool holders is a real time-saver. A circle of 25mm steel plate won't cost much from your local profile cutter and will make a good backing plate. When it comes to drills, milling cutters, etc. then always buy good respected brands - dearer to buy but better value in the long run.

  9. #9
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    Chuck more like macdonalds or machinery warehouse. second hand one could be fine off trademe.
    You can also make them, depending what your time is worth and what you want to learn.

  10. #10
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    While i agree to a point on the mills and end mills being lesser quality from china,Myself and others in the trade all source the carbide from aliexpess or alibaba at a tenth of the price paid here.

  11. #11
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    Quote Originally Posted by Markgibsonr25 View Post
    While i agree to a point on the mills and end mills being lesser quality from china,Myself and others in the trade all source the carbide from aliexpess or alibaba at a tenth of the price paid here.
    I don't run a lot of carbide/ inserts. What's the life on them, by comparison?

  12. #12
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    My new lathe has only been here 2 weeks and uses 20mm tooling so early days on carbide life but they are so cheap i think it is a non issue.I have two friends who do this for a living over the last twenty years and only use hss if it is soft like brass alloy etc as it stops the chips coming back at you like carbide.One refuses to use hss as the speed he can cut and remove material with carbide is far more efficient.He is also taking 8mm off in a single pass on some jobs !!

  13. #13
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    I use flood coolant on most of the jobs and playing around and still on the original tips after two weeks.I guess carbide life would depend a lot on type of material cut and keeping the work and tips cool.

  14. #14
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    Time and a place. Better measure in the home shop would be how many kg of swarf you can peel for the price, and afaik HSS still wins. Also teaches valuable lessons about tool geometry, and as mentioned, option of custom form tooling.

    Flood coolant also pita in home shop.

    If the swarf ain't blue, you're just playing. -Also means the heat goes out with the chip rather than staying in the tool/work.

    4mm doc sounds like a fun machine to be spinning.

  15. #15
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    Yep, there is nothing than can't be done by HSS, especially by grinding the tool rake to suit the material. TC has only been commonly available since the 1960's. For the 100 years prior to that it was all done with HSS (including the engineering output of two World wars). I don't think you can find much fault with the quality of engineering up to and including WW2.
    Russian 22., 40mm and mimms2 like this.

 

 

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