Tapping.

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pre65
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#1 Tapping.

Post by pre65 »

As a result of the heatsink/tapping discussions yesterday, I came across (on Ebay) a set of taps where the taper and second cut the thread smaller size than normal. So taper is smallest, second is a tad bigger, and plug finishes the thread to proper size.

Seemed to me a good idea, particularly for small threads. So I ordered a set of M3, but they will be a week or so coming. When they do get here I'll practice on a scrap bit and see what happens. I'm not expecting much for the price, but you never know.

https://www.ebay.co.uk/itm/Countersink- ... 2749.l2649
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Nick
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#2 Re: Tapping.

Post by Nick »

For anything like that I can recommend ukdrills.co.uk

https://www.ukdrills.com/taps-and-dies
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pre65
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#3 Re: Tapping.

Post by pre65 »

Nick wrote: Fri Jul 03, 2020 1:00 pm For anything like that I can recommend ukdrills.co.uk

https://www.ukdrills.com/taps-and-dies
Yep, I buy my drills from them.

Not being too set in my ways, I tried Nicks way of lubrication (oil in a pot) and it's just as good as the spray I had used previously, and less messy. That was M8 x 1.25 in aluminium.
Life is what happens to you while you're busy making other plans. John Lennon

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Paul Barker
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#4 Re: Tapping.

Post by Paul Barker »

No idea lube for ally but beef dripping good otherwise.
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Ali Tait
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#5 Re: Tapping.

Post by Ali Tait »

Used to use Vaseline, just dip the tap in it. Cue DTB. :D
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Ray P
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#6 Re: Tapping.

Post by Ray P »

Ali Tait wrote: Fri Jul 03, 2020 4:56 pm Used to use Vaseline, just dip the tap in it. Cue DTB. :D
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Ali Tait
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#7 Re: Tapping.

Post by Ali Tait »

:D Wonder what burning Vicks smells like..
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Paul Barker
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#8 Re: Tapping.

Post by Paul Barker »

You took that to a new level. Pat on the back for laddishness
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Dave the bass
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#9 Re: Tapping.

Post by Dave the bass »

Ali Tait wrote: Fri Jul 03, 2020 4:56 pm Used to use Vaseline, just dip the tap in it. Cue DTB. :D
Filth! :shock:

P.S *schoolboy snigger*
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pre65
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#10 Re: Tapping.

Post by pre65 »

I was drilling four holes in a heatsink, to tap M3.

I used a slightly smaller drill than 2.5mm for a pilot hole, but when I changed to the 2.5mm drill it did not seem to be removing any material.

So I measured it with a vernier caliper (non digital) and it seemed to be only 2.4mm. I then spent ages finding my metric micrometer and the drills are indeed, only 2.4mm. It may not seem a lot difference, but it might explain why I've had trouble with M3. There were only 2 left out of a packet of 10, and there are no markings on the shank, checked with a magnifying glass.

I usually check drill size with a vernier before use but these were in a plastic container marked 2.5mm.

I've had to order some more now. :(
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Greg
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#11 Re: Tapping.

Post by Greg »

Hmm, you and your cheap Chinese buys. What do you expect?
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pre65
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#12 Re: Tapping.

Post by pre65 »

Greg wrote: Fri Jul 03, 2020 11:14 pm Hmm, you and your cheap Chinese buys. What do you expect?
Steady on Greg. You have absolutely no idea where they came from. :evil:

I'm not a fan of anything Chinese,but not because of bad quality. Whoever packaged those drills made a mistake, but that's just one of those things. I doubt there was any malicious intent in their action.

He who never made a mistake never did anything at all. :wink:
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pre65
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#13 Re: Tapping.

Post by pre65 »

I phoned a friend in the village, he's into model engineering, and he's loaned me a drill.

It's a thou under 2.5mm, so it could be a number 40, but it will do the job.

I found a chart online giving the metric and decimal sizes of fractional, letter and number drills. I've printed it off and laminated it for future reference. :)

http://www.smithbearing.com/images/pdf/ ... lChart.pdf
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Mike H
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#14 Re: Tapping.

Post by Mike H »

Just a thought, 2.4mm is just about 3/32 inch ...
 
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