Gallery, Projects and General > Project Logs

Threading Die Holder

<< < (3/9) > >>

Darren:
Killer Drill bits

Ordered two weeks ago, had to call them to see where my order was, usual story of the carrier lost them etc.
Sent out again yesterday, arrived today,

I needed a 5mm bit, but had to make the order value up so I ordered 3 sizes of carbide tipped and 6 cobalt drills. Useful small selection.
Except the 5mm I wanted in the first place wasn't there, they sent a 5.5mm instead  :doh:
Small issue maybe, but not to us types is it  :bang:
Anyways, the company is good to deal with. Even by email they are quick to respond, like ten min at most, and are sending the correct one out asap.
Would I recommend them, well despite the small hic-ups yes I would to be honest. They are good to communicate with and do as they say, mostly... :lol:

And the best bit are their prices, not bad at all.
The company is Leo Fixings.com

Here is the killer tungsten carbide tipped bit....I realise you can't see it but this blighter is sharp enough to cut skin just by holding it  :bugeye:



My thanks go to yet again to Bogs for the recommendation. Without which I couldn't find this type of bit anywhere even on the net.  :thumbup:

Darren:
I thought I'd have another go at this again tonight. Trying to tie up a few loose end projects.

It's turning into a bit of a disaster really. Although I can get superb results with this material on the lathe, doing anything else with it is almost a non starter.

You might want to skip back a few posts to refresh. I need to drill and tap three holes to secure and adjust the dies it will be holding. Simple little holes, but boy is it tough going. Normal drills won't touch it. I tried a new three fluted solid carbide drill and it just shattered to tiny little pieces. Good job I was wearing my safety glasses cos they got hit hard.

Then tonight I tried a "Hard Plate Drill" this is a specialist tungsten tipped drill bit for drilling safes apparently.

It just went blunt, I tried it nice and slow with some lube and a fresh new hole, honest Bogs, I did....it ended up like this and a blunt bit to boot...



I'm about to lathe the end off in this picture...to start afresh and get rid of the messy bit.

So now cleaned off on the lathe I decided for curiosities sake to try drilling head on.



That worked fine, after I'd sharpened the plate drill on the little diamond wheel.  :thumbup:
And it even tapped ok, surprisingly...no broken taps either..



Now then, I ask myself why? Is it because the tiny bit on the outer edge is just very hard, but I drilled through that far?
Or is it something to do with the grain orientation of this steel..?


I'm at a bit of a loss on this  :scratch:

Bernd:
Darren,

I wondering if it isn't what is called "case hardened". I went back to the earlier pictures and believe it looks like it's a shaft of some kind with a splined end. If it's similar to a drive shaft I would think it to be a tough metal plus case hardened.

The carbide turning tool would cut that like you showed. As far as the drill is concerned perhaps you pushed to hard to get it to drill. What I don't understand is that you tried another carbide drill and it to wouldn't drill through either.

Yet when you drilled the end it drilled and tapped fine. That makes me think it was case hardened.

Have you tried annealing the metal?

Don't have any other thoughts at the moment.  :wave:

Bernd

Stilldrillin:
Bernd, Darren,

That type of component, (drive shaft?) Would have been carburised to a depth of .100".

Probably......  ::)

David D

bogstandard:
Darren,

Just a little word about Leofixings.

I have never had one single hiccup with them at all, and I do use them regularly for bits 'n bobs, especially drill bits. Maybe someone on their end was having a bad day.

It might be time to call it a day on this one, and find another 'lump' of something. Sometimes we all come across jobs where we have to admit defeat and swallow our pride.
I think I mentioned that I have machined up one of these half shafts in raw form, and it was definitely no fun, I wouldn't like to do it a second time.

John

Navigation

[0] Message Index

[#] Next page

[*] Previous page