This mornings task, was to make a 1" OD pulley for a small rope, which
raises the bin lids to make it easy to put rubbish in the wheelie bins
in their shed.

I fished out a bit of scrap brass which had some machining already done
on it previously, put it in the lath, turned a suitable groove around
the outer diameter, then tried to drill a hole down the centre. None of
the selection of drills would even mark the brass. After two hours
trying to drill the hole, I tried annealing it. Heated it up, plunged
it in cold water - made no difference, tried again, no difference.

I gave up and cut a fresh section of brass, job done in 20 minutes.

On 12/07/2016 20:12, Harry Bloomfield wrote:
This mornings task, was to make a 1" OD pulley for a small rope, which
raises the bin lids to make it easy to put rubbish in the wheelie bins
in their shed.

I fished out a bit of scrap brass which had some machining already done
on it previously, put it in the lath, turned a suitable groove around
the outer diameter, then tried to drill a hole down the centre. None of
the selection of drills would even mark the brass. After two hours
trying to drill the hole, I tried annealing it. Heated it up, plunged it
in cold water - made no difference, tried again, no difference.

I gave up and cut a fresh section of brass, job done in 20 minutes.


how breathtaking

critcher wrote in news:nm3k76$125r$3
@gioia.aioe.org:

On 12/07/2016 20:12, Harry Bloomfield wrote:
This mornings task, was to make a 1" OD pulley for a small rope, which
raises the bin lids to make it easy to put rubbish in the wheelie bins
in their shed.

I fished out a bit of scrap brass which had some machining already done
on it previously, put it in the lath, turned a suitable groove around
the outer diameter, then tried to drill a hole down the centre. None of
the selection of drills would even mark the brass. After two hours
trying to drill the hole, I tried annealing it. Heated it up, plunged it
in cold water - made no difference, tried again, no difference.

I gave up and cut a fresh section of brass, job done in 20 minutes.


how breathtaking


Poor drill grinding!

Perhaps its from an alien spacecraft which unfortunately came to grief while
attempting to abduct Harry?
Brian

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"critcher" wrote in message
...
On 12/07/2016 20:12, Harry Bloomfield wrote:
This mornings task, was to make a 1" OD pulley for a small rope, which
raises the bin lids to make it easy to put rubbish in the wheelie bins
in their shed.

I fished out a bit of scrap brass which had some machining already done
on it previously, put it in the lath, turned a suitable groove around
the outer diameter, then tried to drill a hole down the centre. None of
the selection of drills would even mark the brass. After two hours
trying to drill the hole, I tried annealing it. Heated it up, plunged it
in cold water - made no difference, tried again, no difference.

I gave up and cut a fresh section of brass, job done in 20 minutes.


how breathtaking

On 13/07/16 11:23, DerbyBorn wrote:
critcher wrote in news:nm3k76$125r$3
@gioia.aioe.org:

On 12/07/2016 20:12, Harry Bloomfield wrote:
This mornings task, was to make a 1" OD pulley for a small rope, which
raises the bin lids to make it easy to put rubbish in the wheelie bins
in their shed.

I fished out a bit of scrap brass which had some machining already done
on it previously, put it in the lath, turned a suitable groove around
the outer diameter, then tried to drill a hole down the centre. None of
the selection of drills would even mark the brass. After two hours
trying to drill the hole, I tried annealing it. Heated it up, plunged it
in cold water - made no difference, tried again, no difference.

I gave up and cut a fresh section of brass, job done in 20 minutes.


how breathtaking


Poor drill grinding!

maybe it was bronze, not brass



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No Apple devices were knowingly used in the preparation of this post.

The Natural Philosopher a écrit :

Poor drill grinding!

Nope, I tried several, some brand new.


maybe it was bronze, not brass

That might be a possibility, how could I prove it?

On 13/07/16 17:30, Harry Bloomfield wrote:
The Natural Philosopher a écrit :

Poor drill grinding!

Nope, I tried several, some brand new.


maybe it was bronze, not brass

That might be a possibility, how could I prove it?

Not sure.

phosphor bronze is HARD stuff


--
Microsoft : the best reason to go to Linux that ever existed.

DerbyBorn wrote
critcher wrote
Harry Bloomfield wrote

This mornings task, was to make a 1" OD pulley for
a small rope, which raises the bin lids to make it
easy to put rubbish in the wheelie bins in their shed.

I fished out a bit of scrap brass which had some machining already
done on it previously, put it in the lath, turned a suitable groove
around the outer diameter, then tried to drill a hole down the centre.
None of the selection of drills would even mark the brass. After two
hours trying to drill the hole, I tried annealing it. Heated it up,
plunged
it in cold water - made no difference, tried again, no difference.

I gave up and cut a fresh section of brass, job done in 20 minutes.

how breathtaking

Poor drill grinding!

Unlikely given that the different bit of brass could be drilled fine.

On 7/13/2016 8:17 PM, The Natural Philosopher wrote:
On 13/07/16 17:30, Harry Bloomfield wrote:
The Natural Philosopher a écrit :

Poor drill grinding!

Nope, I tried several, some brand new.


maybe it was bronze, not brass

That might be a possibility, how could I prove it?

Not sure.

phosphor bronze is HARD stuff


Yes but it should machine and drill OK with a properly sharpened drill!

On Thursday, 14 July 2016 21:11:57 UTC+1, newshound wrote:

maybe it was bronze, not brass
That might be a possibility, how could I prove it?
Not sure.
phosphor bronze is HARD stuff
Yes but it should machine and drill OK with a properly sharpened drill!

I made that mistake once. I was trying to cut a 5/8" BSP thread and it took
ages with a freshly ground tool. (I was making an A-pillar to DIN adapter
for SCUBA purposes. It really was hard work.

John