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  #11  
Old 31st January 2018, 10:04 AM
Richard Richard is offline
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Default Re: help tapping screw threads

My two penneth,
A full set of taps is usually Taper, Second, and Plug but a Second does most jobs unless you need to get to the bottom of a blind hole.
A T handle for the tap is invaluable.
The best brands are very expensive (Dormer etc) so the quality to look for is HSS (high speed steel) and look how cleanly the threads and flutes are ground. A lesser but often useable quality is Tunsgsten steel and the lowest are carbon steel for soft materials.
Re. the job, remember anodised aluminium doesn't conduct electricity through its surface skin so check any connections through an aluminium assembly (and don't rely on it being an insulator either).
Interesting bit about Philips screws on Wiki, https://en.wikipedia.org/wiki/Cam_out
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  #12  
Old 31st January 2018, 10:11 AM
Richard Richard is offline
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Default Re: help tapping screw threads

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Originally Posted by bob orbell View Post
John, to my understanding, Torx bolts replaced Allen head bolts, because of the greater contact area of the Torx, I have never yet had a Torx bolt that rounds off, they always undo, even rusty ones. BOB
Torx are great and I see Wickes now do Torx decking screws instead of their non-cam cross heads. The external version E nuts seem to be gaining popularity as well. Slow start, they've been around for many years
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  #13  
Old 31st January 2018, 06:50 PM
bikerhifinut bikerhifinut is offline
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Default Re: help tapping screw threads

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Originally Posted by John Caswell View Post
Hi all,
JohnG's and Bob's comments are very relevant, the original Philips head screws used to suffer from "cam out" due to their sloping sides, and very often worn screwdrivers. "Pozidriv" heads were supposed to overcome this, due to parallel side, and did to some degree. "Allen" "Torx" and "Bristol Spline" are considerably better but as usual you must use decent screwdrivers.
It is interesting to note that motor industry wholeheartedly took up "Torx" heads for a lot of their fixings due I suspect to less danger of the driver slipping out.

John
I may be wrong here but i was told that Torx heads were developed by Ford for a number of practical reasons.

Colin, Aldi are flogging a tap and die set for £16 just now. If its only for a few odd threads they'd likely do you fine. Obviously if you intend to do a lot of thread cutting and on harder materials than alloy you may want to invest in a "quality" brand.

Andy.
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  #14  
Old 31st January 2018, 08:17 PM
bob orbell bob orbell is online now
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Default Re: help tapping screw threads

This maybe just what you are looking for Colin, as Andy say's, they will not do for harder material, and may not snap if you bend them very slightly, as will high quality taps. BOB
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  #15  
Old 31st January 2018, 08:34 PM
John Caswell John Caswell is offline
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Default Re: help tapping screw threads

Hi all,
I believe the TORX head was developed in the US by Camcar Textron and that is as as far as my knowledge goes. Suppose I should look it up in Wiki

John
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  #16  
Old 31st January 2018, 11:31 PM
Richard Richard is offline
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Default Re: help tapping screw threads

My earliest encounter with it was on a Mk4 Cortina seatbelt buckle in 1981
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  #17  
Old 1st February 2018, 08:43 AM
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pre65 pre65 is offline
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Default Re: help tapping screw threads

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Originally Posted by Richard View Post
My earliest encounter with it was on a Mk4 Cortina seatbelt buckle in 1981
I think mine was on my Dads 1500 Austin Allegro.
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Everything in this post is my honest opinion based on what i thought I knew at that very moment in time.
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  #18  
Old 1st February 2018, 04:11 PM
colin.hepburn colin.hepburn is online now
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Default Re: help tapping screw threads

Hi Andy thanks
No Aldi near me but do have a screwfix just a cheap half kit would do I think with the sizes taps I need
Have I started a discussion on TORX? My experience with them is shit donít have the bits when opening a case
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  #19  
Old 1st February 2018, 04:58 PM
bob orbell bob orbell is online now
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Default Re: help tapping screw threads

Then buy some dear Colin dear Colin, buy some, you should be able to get a cheap set of Torx drivers from Screwfix too, sorry to disagree with your comment on Torx, shit they are not, that is why the whole world now use them . BOB
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  #20  
Old 1st February 2018, 06:13 PM
colin.hepburn colin.hepburn is online now
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Default Re: help tapping screw threads

Aha BOB I didnít mean the torx shit I meant shit canít get in the box a case of not having the right tools when you need them I will buy a set
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