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Darren:
Actually for someone who certainly considers themselves to be a complete novice I have found single point threading to be a complete and utter doddle...

Nothing to it....honestly... :thumbup:

Certainly on a 7x12 it is at least..... :dremel:

Stilldrillin:

--- Quote from: Darren on August 01, 2009, 08:49:56 PM ---Actually for someone who certainly considers themselves to be a complete novice I have found single point threading to be a complete and utter doddle...

Nothing to it....honestly... :thumbup:

Certainly on a 7x12 it is at least..... :dremel:

--- End quote ---

He`s right, you know! :thumbup:

David D

spuddevans:
So here's todays update.

I started off by grinding up a new undercutting tool, about 0.8mm wide, here shown with one of the previously made gland adjustment screws for comparison

Then I chucked up the brass hex bar in the 3jaw and turned down a little section for threading using a 6mm round profiling tool.

Then I used the new undercutting tool to, umm, ........ undercut a groove

and then single point threaded a M6 thread ( as promised before, I will post up a new thread with a more detailed explaination of how I single point )

And within a short time I had a little family made up.

After changing over to the ER32 collet chuck that still had the packing gland mounted in it. I centre drilled, drilled and then tapped M6 to 5mm depth as per the plans. ( I had to grind down the tips of the taps as they were quite long and tapered to a point, too long to use in this application)

Then I mounted one of the gland screws and screwed it well in, then tidied up the backside of the screw, and then drilled the two pieces at once to keep concentricity, I drilled them 2.2mm then 2.9mm and finally 3mm.

Then I removed the adjusting screw, then reversed the packing gland and turned down the reverse side to fit the bore. This is the result.

Here is what it looks like in its place.

And that's as far as I got today, next time I will make a 2nd packing gland, and then onwards and upwards umm sideways

I gotta go eat some food, then I'll post up my adventures in threading.

Tim

bogstandard:
Just one criticism Tim.

If you look at commercially ground threading tools, you will notice that the left hand side is ground away as much as possible. If you did that, you could turn almost to the shoulder without it cutting the chamfer under the screw head.

Bogs

spuddevans:

--- Quote from: bogstandard on August 02, 2009, 04:19:21 PM ---Just one criticism Tim.

If you look at commercially ground threading tools, you will notice that the left hand side is ground away as much as possible. If you did that, you could turn almost to the shoulder without it cutting the chamfer under the screw head.

Bogs

--- End quote ---

That's a good idea, never thought of that, I'll have to grind up a off-centre threading tool. :thumbup: :thumbup:

On these screws the chamfer was created by the round profiling tool, I thought it looked kinda nice and it had the additional plus of allowing the (oversized) threading tool to get close enough.

But I will definately grind up a better threading tool that'll allow threading closer to a shoulder.

Tim

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