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  1. #1981
    Join Date
    Jan 2016
    Location
    Wodonga Vic
    Age
    38
    Posts
    633

    Default

    Thanks and sorry for the late reply Kryn,

    The Brass I used was cut from a piece of round bar, I bought it from Surman Metals a long time ago.

    Not a whole lot to tell about the burner, I pulled some scrap 20mm and 35mm gal out of the bin and stuck it together.

    I had a go at lost foam casting brass today and the results are pretty crap, I think my sand isn't fine enough and I'm packing it too tight and creasing the polystyrene, the last one I poured by itself and it's the best of the 4 but still has some crease lines through it.

    I'll keep trying.
    DSC_0143.jpgDSC_0146.jpgDSC_0152.jpgDSC_0160.jpg

    Ben

  2. #1982
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,945

    Default

    Rather than using your good bras bar, contact a local plumber to see what he's got in the way of old taps and fittings. I've probably got 3 kg of scrap bras saved up, sometimes I use some for different purposes. Can't help you with rectifying faults/causes sorry.
    Kryn
    To grow old is mandatory, growing up is optional.

  3. #1983
    Join Date
    Jan 2016
    Location
    Wodonga Vic
    Age
    38
    Posts
    633

    Default

    Good advice Kryn, I'll talk to some plumbers and see what they have to offer, are you doing/plan on doing some metal casting yourself?

  4. #1984
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,945

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    Not planning to at present, I just use the tap shafts for when I need a bit of brass, do you want some??? A lot of it is brass washers out of some machine, and tap parts. I'll weigh it up and see exactly how much is there.
    Kryn
    To grow old is mandatory, growing up is optional.

  5. #1985
    Join Date
    Aug 2010
    Location
    Toorloo Arm, VIC
    Age
    39
    Posts
    1,270

    Default

    Quote Originally Posted by KBs PensNmore View Post
    I've probably got 3 kg of scrap bras saved up, sometimes I use some for different purposes.
    To quote AvE: Hey, I don't judge...

    Sorry, couldn't resist.

  6. #1986
    Join Date
    Nov 2007
    Location
    melbourne australia
    Posts
    3,228

    Default

    Tailstock tool holder in HDPE. I reamed the holes with a cheap MT2 reamer, but it isn't really necessary.
    Attached Images Attached Images
    Chris

  7. #1987
    Join Date
    Aug 2008
    Location
    Tennant Creek, Aust
    Age
    61
    Posts
    596

    Default

    Quote Originally Posted by jack620 View Post
    Tailstock tool holder in HDPE. I reamed the holes with a cheap MT2 reamer, but it isn't really necessary.
    That is very neat, I like it very much.


    Sent from my E6883 using Tapatalk

    Ratty 05/2004 -05/07/2010 COOPER 01/08/1998-31/01/2012

  8. #1988
    Join Date
    Jun 2007
    Location
    Vic
    Age
    48
    Posts
    544

    Default

    Not really a project. It is my first attempt with the D-bit grinder. Hope it works

    20171104_165933.jpg20171104_170229.jpg20171104_170247.jpg20171104_170302.jpg

  9. #1989
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,443

    Default

    Hi, That looks quite good ! and very sharp. A little less rake would give the tool edge more support though. I usually try for about ten degrees.
    Best Regards:
    Baron J.

  10. #1990
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    733

    Default

    Quote Originally Posted by jackaroo View Post
    ............. D-bit grinder .............
    Snazzy looking grind, well done.

    I've always been puzzled by the name d bit grinder, is there something about them that makes grinding d bits easier than other tool grinders ? Is the name due to historical reasons ? Does anything stop you from grinding ordinary tools and drill bits on it as well ?

    Bill

  11. #1991
    Join Date
    Jun 2007
    Location
    Vic
    Age
    48
    Posts
    544

    Default

    Hi Bill, I am still learning. Maybe someone has more experience can explain it better?
    The Tool and Die guy has quite a few videos on it.
    https://www.youtube.com/user/TheToolandDieGuy/videos


    Regards,
    Trong

  12. #1992
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    733

    Default d bit grinder

    Hey Trong,

    Found this on wikipedia

    The D-bit grinder is a tool bit grinder that specializes in the grinding of D-bit cutters for pantograph milling machines. Pantographs are a variety of milling machine used to create cavities for the dies used in the molding process, they are being rapidly replaced by CNC machining centers.

    Bill

  13. #1993
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,945

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    I think (now I've got a headache), that the name D bit, came about as to the shape of the bit when looking at the business end of it.
    Kryn
    To grow old is mandatory, growing up is optional.

  14. #1994
    Join Date
    Jul 2014
    Location
    Alphen aan den Rijn, Netherlands
    Posts
    208

    Default

    Quote Originally Posted by steamingbill View Post
    Snazzy looking grind, well done.

    I've always been puzzled by the name d bit grinder, is there something about them that makes grinding d bits easier than other tool grinders ? Is the name due to historical reasons ? Does anything stop you from grinding ordinary tools and drill bits on it as well ?

    Bill
    Bill,
    I recently bought a used D-bit grinder so I can hardly be called an expert, but I have done some research before I bought it. Here are my thoughts:
    The D bit grinder is especially suited for grinding D bits, think of the stop for turning the bit 180 deg. and the 24 position diving functionality, the different angle settings etc. Doing this work on a bench grinder is not feasible I believe, and the other alternative is a tool and cutter grinder with the appropriate fixtures, which might be a bit overkill in this instance.

    It is certainly possible to grind other tools on a D bit grinder. In fact, when you buy a complete set of a Chinese Deckel copy you also get a fixture for grinding drills, one for grinding lathe bits and one for grinding regular milling cutters. I have such a copy with all the attachments, but have not used those yet, so I have no experience. I do know Stephan Gotteswinter (YouTube) also has a Chinese D bit grinder and is very happy with it, but sold all the extra attachments because he didn't use them.
    There are various YouTube clips from sellers of these machines where they demonstrate the use of these attachments though if you are interested.
    I also think it would not be hard to make some special tool holders if you have a need. The way they attach to the grinder is not that complicated.

    Peter

  15. #1995
    Join Date
    Jul 2014
    Location
    Alphen aan den Rijn, Netherlands
    Posts
    208

    Default

    I also think Kryn is right about the name D bit. They are also known as single lip cutters, which may me a lot easier to understand.... Your latest project
    Peter

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