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Thread: Your latest project
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7th Oct 2017, 05:08 PM #1981Golden Member
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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.
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Ben
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7th Oct 2017, 09:27 PM #1982Most Valued Member
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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.
KrynTo grow old is mandatory, growing up is optional.
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7th Oct 2017, 10:39 PM #1983Golden Member
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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?
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7th Oct 2017, 10:59 PM #1984Most Valued Member
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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.
KrynTo grow old is mandatory, growing up is optional.
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7th Oct 2017, 11:51 PM #1985I break stuff...
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22nd Oct 2017, 10:10 AM #1986Most Valued Member
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Tailstock tool holder in HDPE. I reamed the holes with a cheap MT2 reamer, but it isn't really necessary.
Chris
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22nd Oct 2017, 01:41 PM #1987
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4th Nov 2017, 06:19 PM #1988Golden Member
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Not really a project. It is my first attempt with the D-bit grinder. Hope it works
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4th Nov 2017, 10:13 PM #1989
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.
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5th Nov 2017, 08:31 AM #1990Golden Member
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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
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5th Nov 2017, 11:36 AM #1991Golden Member
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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
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5th Nov 2017, 03:14 PM #1992Golden Member
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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
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5th Nov 2017, 07:14 PM #1993Most Valued Member
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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.
KrynTo grow old is mandatory, growing up is optional.
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5th Nov 2017, 09:48 PM #1994
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
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5th Nov 2017, 09:53 PM #1995
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....
Peter
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