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  1. #526
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,446

    Default

    Put me down as a +1 for allowing the saw cut under its own weight and the for using good quality blades.

    I used a number of different branded blades until I stumbled on Makita friction saw blades which worked quite well on my grungy old GMC friction saw. One thing is for certain and it is that cheap blades will not give you a good result.As noted some are too thin and too flexible

    Forcing the saw through the material will cause the blade to distort. I found that part of the trick is to use the saw so as to minimise any rpm loss and let the the wheel speed do the work.

    I do recall cutting wheels glazing on the wheel periphery and they may well have been Flexovit brand. I thought it was just me forcing the saw too hard. You may be shocked by how much the blade will distort off square and yet does not shatter.

    A dedicated stand goes a long way keeping stock for cutting on the straight and level.

    I fitted my saw with a frame with castors to allow me to wheel it outside to spray the sparks outside. The saw has seen no use since I obtained a bandsaw.

    Grahame

  2. #527
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default

    Learnt again in this case.
    Silver solder has a nasty habit of getting everywhere(especially when you're using a 2" gas touch). Making a scriber for my height gauge and managed to nicely weld a 25*20*9mm packer use to clamp the carbide in place to the job.

    Used a carbon arc on an old stick welder box to heat up the packer until it fell off without having the carbide fall off at the same time, so thats a win.

    Now I just have to polish it all up again for my first go at blacking.

    Stuart
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  3. #528
    Join Date
    Jul 2008
    Location
    near Warragul, Victoria
    Posts
    3,718

    Default brazing carbide

    This may have helped you S

    How to Braze Tungsten Carbide

  4. #529
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    Quote Originally Posted by morrisman View Post
    This may have helped you S

    How to Braze Tungsten Carbide
    took this quote from your link morrisman

    "Tungsten carbide with any sort of oil, grease, oxide or free carbon on it will not braze"

    rubbish heat it long enough to burn the oil out and it will....lol.

    but yeah good article

  5. #530
    Join Date
    Oct 2008
    Location
    N.W.Tasmania
    Posts
    1,407

    Default

    Quote Originally Posted by Stustoys View Post
    Learnt again in this case.
    Silver solder has a nasty habit of getting everywhere(especially when you're using a 2" gas touch). Making a scriber for my height gauge and managed to nicely weld a 25*20*9mm packer use to clamp the carbide in place to the job.

    Used a carbon arc on an old stick welder box to heat up the packer until it fell off without having the carbide fall off at the same time, so thats a win.

    Now I just have to polish it all up again for my first go at blacking.

    Stuart
    Good on you Stu, at least you don't let minor hassles stop you from getting her done to quote one of our favourite Keiths.
    Now if you have some conc. HNO3 handy, you can save some time on the cleanup, just keep it away from the metallic bits you want, (I think that the carbide should be OK). Not so human tissue, so keep it well clear of your old bod too, as conc.HNO3 rips flesh in no time flat. I'm sure that you already knew that but perhaps some others don't.
    RT

  6. #531
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default

    Quote Originally Posted by morrisman View Post
    This may have helped you S

    How to Braze Tungsten Carbide
    The carbide stuck just fine. It even survived the grinding(finally got to use my glass lense grinder). A little more polishing* to go before blacking, I'll leave the finial sharpening until after that.
    What amazed me was the wicking between two "pretty damn flat", polished(so at least they were clean), unfluxed surfaces that were clamped together.

    Quote Originally Posted by Ropetangler View Post
    Now if you have some conc. HNO3 handy, you can save some time on the cleanup, just keep it away from the metallic bits you want, (I think that the carbide should be OK). Not so human tissue, so keep it well clear of your old bod too, as conc.HNO3 rips flesh in no time flat. I'm sure that you already knew that but perhaps some others don't.
    RT
    Funny you should say that, the next process uses 70% HNO3**.
    I've been wondering just what effect it will have on the silver solder.


    Stuart

    *its a lot better than the picture makes it look, something to do with the compression of the .jpg

    **time to fess up another "what did you learn today"
    No matter how much care is taken some fool can screw things up.
    The first bottle of HNO3 I purchased was carefully wrapped in bubble wrap and placed and a cardboard box full of foam peanuts. When I got home I opened the cardboard box to get the silicon grease I purchased at the same time and managed to tip the lot over. All would have been good except the lid hit a piece of steel on the way down and broke. I legged it while I had a think what to do next. Bucket of water, shop towel and some tongs.... was I making nitrocellulose? still they when straight in the water. some pm's and some lime and all is good except having to spend $20 on some more HNO3.
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  7. #532
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    733

    Default The Worm Turns

    Today I learned that I can cut a wormscrew and how to load a video on youtube - see my very first video - "The Turning of the Worm" here -

    https://www.youtube.com/watch?v=s5LfWQ1caZc&feature=youtu.be

    exhilerating stuff eh ?


    Was the end result of a few smaller things built previously

    Rotary Turntable from an Aldi Gym Weight
    The little Angle jig to assist grinding tools was made on rotary table
    Indexing jig to help cut spur gears - blatant copy of Harold Hall jig
    35 and 55 tooth spur gears to celebrate Pi day last week
    Used the little angle jig to help cut the Vee tool for the worm
    cut the worm today

    The whole process seemed quite forgiving - ie the gears were not perfect but they meshed well enough with the Hercus gears and cut the worm and the worm meshed well with the hercus gears - not so well with my own gears - but they still turned.

    Will have another go and try to be more careful.

    Resources :

    George Thomas Books
    Ivan Law Book
    Xynudu Youtube Video re gear cutting and website here Cut a lathe change gear
    Helicron Website - this is very interesting - will have a go at this method soon - Involute Gears


    Bill
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  8. #533
    Join Date
    Aug 2015
    Location
    QLD
    Posts
    735

    Default

    Quote Originally Posted by steamingbill View Post
    Today I learned that I can cut a wormscrew and how to load a video on youtube - see my very first video - "The Turning of the Worm" here -

    https://www.youtube.com/watch?v=s5LfWQ1caZc&feature=youtu.be

    exhilerating stuff eh ?

    Tried the link and get a "this video is private" message. ?

  9. #534
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    733

    Default

    Should be okay now - have never done a youtube video before so didnt know I had to publish it.

    Bill

  10. #535
    Join Date
    Aug 2015
    Location
    QLD
    Posts
    735

    Default

    Came out OK. Next step is talking...

  11. #536
    Join Date
    Jul 2008
    Location
    near Warragul, Victoria
    Posts
    3,718

    Default

    Quote Originally Posted by steamingbill View Post
    Rotary Turntable from an Aldi Gym Weight Bill
    Was the Aldi weight easy to machine ? I did see them at Aldi but I thought that they would have a hard surface , the type of thing that blunts lathe tools real quick . You will sometimes find those weights in op shops or garage sales . They often end up being chucked out or given away.

  12. #537
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    733

    Default

    It wore down the tip of an HSS tool and I ended up using a Tungsten Carbide tool and that worked very well.

    Bill

  13. #538
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    Hi Bill,
    Any chance of some pics of your Rotary Turntable from an Aldi Gym Weight, or did you do a WIP please ??
    Kryn
    To grow old is mandatory, growing up is optional.

  14. #539
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Quote Originally Posted by steamingbill View Post
    It wore down the tip of an HSS tool and I ended up using a Tungsten Carbide tool and that worked very well.

    Bill

    Hello Bill,

    The trick with cast iron is taking a big enough depth of cut so you get under the hard surface. Carbide tool bits make this easy, though I have only ever used HSS tool bits on the Myford lathe.

    Old bar weights can be picked up for almost nothing at the local scrap yard. I was down there this morning looking for some material and there is a pile of them about 2 foot high on a pallet. The big ones must be 18 or 20 inches in diameter and probably 2 inches thick.
    Best Regards:
    Baron J.

  15. #540
    Join Date
    Jan 2011
    Location
    Far West Wimmera
    Age
    63
    Posts
    4,049

    Default

    Quote Originally Posted by BaronJ View Post
    Hello Bill,

    The trick with cast iron is taking a big enough depth of cut so you get under the hard surface. Carbide tool bits make this easy, though I have only ever used HSS tool bits on the Myford lathe.

    Old bar weights can be picked up for almost nothing at the local scrap yard. I was down there this morning looking for some material and there is a pile of them about 2 foot high on a pallet. The big ones must be 18 or 20 inches in diameter and probably 2 inches thick.
    I am drooling as I read this. lol There used to be a salvage yard run by Heritage Industries (Disabled Support) in Mt Gambier that had some of this sort of stuff, but it closed down a couple of years ago. Just before I realised the value of weights I think. LOL

    Dean

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