Thread: the possessed meatsafe!!

Originally Posted by astrid

I think the reason that one can drill holes in metal but break a bit in timber is to do with friction, timber seems to grab more
I'm not a scientist but the timber seems to create more friction than metal does.
I hope this kinda makes sense

astrid

If you want to know what friction is, try drilling through hardened steel.

If the bit is grabbing or too aggressive, lower the relief angle of the cutting edge.....and hold your drill straight.

Originally Posted by Cruzi

You have obviously never worked with oooooold ironbark. Something to avoid like the plague, or you will have nightmares for a long time.

Obviously I haven't.

The large showcase display units I have been building from old recycled Ironbark for the last month must actually have been Radiata Pine that had been professionally stained and hardened by someone who really knows what they are doing, because I had no problem nailing it, drilling or machining it.

This is a picture of me gobsmacked by how easy it was.....

Originally Posted by martrix

The large showcase display units I have been building from old recycled Ironbark for the last month must actually have been Radiata Pine that had been professionally stained and hardened by a professional, because I had no problem nailing it, drilling or machining it.

Like you I have some old old ironbark and had no problems with fastening by different means but when I went to turn a knob on the lathe it decided to relocate to about 50 different areas of the shed.
Character building stuff

Originally Posted by Iain

Like you I have some old old ironbark and had no problems with fastening by different means but when I went to turn a knob on the lathe it decided to relocate to about 50 different areas of the shed.
Character building stuff

or pants filling!

Being so hard, it does tend to shatter when its forced to do something it doesn't want to. Off cuts on a dock saw can go flying with force, and a thin off cut on the TS is exciting if you don't have a zero clearance plate in.

You could tell us how you really feel, what was denigrating

Voila............what am I replying to? post has vanished

Hardened steel is a breeze compare to *ooooold ironbark*, just because you did some well seasoned ironbark recently is no call for your idiotic reply, again, try finding some really old stuff before denegrating others.

You really don't want to get into a p*****g contest about drilling or drilling hard materials.

Nobody mentioned the correct speed for the bit, why was that? To be able to clear the bit and avoid heat, therefore bluntness, you need the correct speed.

To cut really hard woods, should the angle of the bit change to more closely resemble steel cutting bits?

Next time i will
1 reduce speed of drill
2 make sure i have a good drill bit. was using the ones supplied with dremel
3 insert steel screw first and wax the screw

dont know what to do about the bent nails.
in the end I pegged the top on

astrid

Astrid, you may need to increase the speed, not decrease it. If the waste is not being ejected from the flutes by centrifugal force then it is probably too slow. The smaller the bit, the faster the revs required.

Look at this chart.

And another thing to follow on from Groogy's post is you may need to pull the bit out 2 or 3 times before reaching depth to clear the flutes as well

Originally Posted by djstimber

And another thing to follow on from Groogy's post is you may need to pull the bit out 2 or 3 times before reaching depth to clear the flutes as well

When drilling timber, regardless of specie, I find that the most important point.

Mind you, I see plenty of tradesmen just push down as hard and as fast as they can. These same tradesmen also don't know how to sharpen a drill bit.

wont increasing the speed on a fine DB increase friction, thus heat and soften DB thus make more prone to breaking
sorry not being a SM
astrid

Re read 23 & 24, the friction is generated from the build up of crud in the flutes, remove and clean, you will feel it when it stops cutting, and a higher speed will assist in the ejection.
Try a spur point bit too, does a better job than a metal drill and cuts a cleaner hole.

now what the h--- is a spur point bit

astrid

Originally Posted by astrid

now what the h--- is a spur point bit

astrid

All you would need to know on different drill bits

I call these a spade bit
but do they come 1m ?

astrid