Anyone brave enough ??

Advert

New Replies

Report Bug

Help/FAQs

Anyone brave enough ??

This topic has 10 replies, 8 voices, and was last updated 16 February 2018 at 03:52 by John Reese.

Viewing 11 posts - 1 through 11 (of 11 total)

Author

Posts
15 February 2018 at 10:12 #341598
Speedy Builder5
Participant
@speedybuilder5
Came across this technique – WOW. Go down the page a bit and see the video.

**LINK**

BobH

Edited By Speedy Builder5 on 15/02/2018 10:13:11
Advert

15 February 2018 at 10:12 #15992
Speedy Builder5
Participant
@speedybuilder5
Thermal drill / threading
15 February 2018 at 10:48 #341604
Clive Foster
Participant
@clivefoster55965
Saw that technique demonstrated at a FAST (fastener industry) exhibition maybe a quarter of a century ago. Two pillar drills on the table, one for the hole one with a Pollard(?) tapping attachment for the tap. Just like the video. Looked really easy but a bit spendy. Worst point is the rather ragged end to the hole. Might have been a spring loaded blade tool to clean it up.

Man did say you needed good solid drills with plenty of power. I want to think he had a pair of the then top end Meddings bench type but it was a long time ago. Not Far East Imports thats for sure.

Clive.
15 February 2018 at 11:11 #341609
Brian Wood
Participant
@brianwood45127
Lots of power needed and rather special steels for the penetrators; a heavy test of machine bearings too

Brian
15 February 2018 at 11:12 #341610
Brian G
Participant
@briang
We looked friction drilling about 25 years back when manufacturing aluminium conservatories. The holes were formed quickly and in a box section the ragged end to the formed boss wasn't important. The downside was time, firstly because our existing multi-spindle air setup couldn't be used so the holes would need to be drilled sequentially and still required tapping. Even before the tooling cost was considered, the additional time cost more than the rivnuts we were currently using.

Brian
15 February 2018 at 12:48 #341623
Brian Wood
Participant
@brianwood45127
Actually, even more impressive are videos of friction welding using heavy lathes to provide the strength and thrust to force billets of rotating material together until they melt. While molten more thrust pushes the joint together to squeeze out oxide films and leave a very ragged looking outer finish at the joint face.

That of course is machined off later, but one major benefit of the method is that dissimilar metals can be welded together in one hit without having to make up compatible transition welds.

Look into work done at the Welding Institute at Cambridge which is where the development work was done

Regards

Brian
15 February 2018 at 13:26 #341627
Hopper
Participant
@hopper
Video looks like some of my efforts at centre drilling.
15 February 2018 at 14:02 #341630
Clive Foster
Participant
@clivefoster55965
Brian G

I'm impressed that the technique could be considered for aluminium. I'd have expected the high thermal conductivity of aluminium to soften the material around the hole enough for things to distort before a clean extrusion for the tapped hole formed.

Clive.
15 February 2018 at 14:48 #341634
Muzzer
Participant
@muzzer
AvE played about with this on Pootube not so long ago. Seemed simple enough although some fruity Canadian language as ever…..

Edited By Muzzer on 15/02/2018 14:49:04
15 February 2018 at 15:17 #341639
Neil Wyatt
Moderator
@neilwyatt
Dig that krautrock soundtrack!

Neil
16 February 2018 at 03:52 #341727
John Reese
Participant
@johnreese12848
What the videos do not show is the very expensive special tool holder that is needed to prevent heat transfer to the spindle bearings.
Author

Posts