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Making darts

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Stewart Hart26/11/2011 20:00:45
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This takes me back abit,
 
My self and another apprentice were given the project to set a six spindle acme gridly up to make darts, i think the forman wanted to keep us out of mischeave.
 
One week later we had the beast running and churned out thousands of the things in a blink of an eye, and ended up getting the bigest bollocking of our lives for useing all the brass bar up that was earmarked for another job.
 
Ho happy days
 
Still come across the od set stuck into pub dartboards that came from that production run.
 
Stew
Michael Gilligan26/11/2011 20:01:38
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23121 forum posts
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Steve,

These guys use the phrase "Readily Machinable"
http://www.mallory.com/datasheets/1300501.htm

[quote]
Unlike pure tungsten which requires to be machined at elevated temperature, tungsten heavy alloys can be machined conventionally, without much difficulty.
[/quote]

MichaelG.
mark stephens26/11/2011 20:30:49
2 forum posts
Thanks for the replies , i have found the Kinver & West Midlands Society of Model Engineers is very near to me and intend to contact them for further help and advice , cheers ,Mark .
Stub Mandrel26/11/2011 21:12:21
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4318 forum posts
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Depleted urnium is highly toxic, especially in bullet form...
 
 
I have heard of a lecturer who had a lump as a paperweight. It would be ideal for ballast on my shunter project.
 
Neil
Tel26/11/2011 21:15:54
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157 forum posts
28 photos
Bullets made of any material can be a health hazard!
Terryd26/11/2011 21:54:07
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1946 forum posts
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Posted by Stub Mandrel on 26/11/2011 21:12:21:
Depleted urnium is highly toxic, especially in bullet form...
 
 
I have heard of a lecturer who had a lump as a paperweight. It would be ideal for ballast on my shunter project.
 
Neil
 
 
I thought all bullets were highly toxic?
 
ElTel
Terryd26/11/2011 22:01:42
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1946 forum posts
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Posted by Tel on 26/11/2011 08:20:10:
'ang on there a minute Other Tel - ain't 6mm 0BA?
 
 
Hi Tel,
 
You are quite right, It was simply another Alzheimer episode on my part, or perhaps just a typo, who knows?
 
 
Posted by Tel on 26/11/2011 09:59:20:
Neither of 'em will be obsolete while I can still become upright!
 
So you are in favour of both imperial and metric standards, in parallel? Sounds like a typical British mish-mash to me!
 
Best regards,
 
ElTel
 
 
Ian S C27/11/2011 07:30:47
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7468 forum posts
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Could you use brass, or stainless steel. make them hollow, fill them with lead? Ian S C
Michael Gilligan27/11/2011 09:32:06
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23121 forum posts
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IanSC,

Presumably yes ... but it's more effective to start with the Tungsten mix [not strictly an alloy]; because its Specific Gravity is significantly higher than Lead.

A built-up construction would probably only weigh half that of the "Tungsten" one.

MichaelG.
Stub Mandrel27/11/2011 11:15:46
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4318 forum posts
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> I thought all bullets were highly toxic?
 
Obviously my latest feeble attempt at humour has failed!
 
Neil
Steve Withnell27/11/2011 16:57:33
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858 forum posts
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Has anyone tried turning these tungsten alloys on a chinese mini-lathe eg Sieg C3? I don't have of this material so I can't try it out. I do have some tungsten bar, but the answer as to the machinability of that is pretty obvious and isn't helpful.
 
Steve
alan frost27/11/2011 18:05:07
137 forum posts
3 photos
Neil,
 
Death by bullet counts as death by "ingestion of a foreign substance" usually via the skin. This is what a lot of pop stars die of . The foreign substances are usually water (well known r.stones member ), lead (well known beatle ), drugs ( a very popular one ,this) , smoke (Steve McQueen ) ,earth (often selected by plane crash or car crash devotees ) ,Turkish coffee, genuine i.e.non- westernised Japanese food. ( any of it) . Oh genuine Mexican food if its folded wrongly can be lethal too.
 
Many pathologists would however agree that death by bullet is more serious than the others.
 
Keef Richards has tried most of the above along with Doctor John ,and has proved they are not necessarily fatal. In fact Keef may well be immortal, he certainly has the constitution of an Ox. Jerry Lee Lewis was for many years an official tester, both actively and passively.
 
Mark, thanks for asking original question. It has expanded my medical and machining knowledge and unearthed our last defender on the NW frontier : and I loved Stewart's reminiscences.
 
Regards.

Edited By alan frost on 27/11/2011 18:12:52

Edited By alan frost on 27/11/2011 18:15:38

Clive Hartland27/11/2011 19:21:09
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2929 forum posts
41 photos
I at one time had to machine some Tungsten counter wieghts for balancing telescope attachments to telescopes that had a 360 deg. rotation.
I found them extremely tough! I used 3 fluted solid carbide cutters and they 'Grunted' a bit.
Luckily I only had two to do as it was hard work on the mill.
I set them up on a rotary table and they had to be machined in an arc to clear the projections they would travel over.
The cuts were very light and repetative to complete the job.
At that time this type of counterwieght was very common on theodolites to balance the wieght of the Distance Measuring device attached to the top of the telescope.
Now the EDM is incorporated into the telescope and counterbalances are no longer needed.
 
Clive
Clive Hartland27/11/2011 19:21:18
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2929 forum posts
41 photos
I at one time had to machine some Tungsten counter wieghts for balancing telescope attachments to telescopes that had a 360 deg. rotation.
I found them extremely tough! I used 3 fluted solid carbide cutters and they 'Grunted' a bit.
Luckily I only had two to do as it was hard work on the mill.
I set them up on a rotary table and they had to be machined in an arc to clear the projections they would travel over.
The cuts were very light and repetative to complete the job.
At that time this type of counterwieght was very common on theodolites to balance the wieght of the Distance Measuring device attached to the top of the telescope.
Now the EDM is incorporated into the telescope and counterbalances are no longer needed.
 
Clive
 
Why is it double posting?

Edited By Clive Hartland on 27/11/2011 19:23:16

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