Tapping.
- pre65
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#1 Tapping.
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
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
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#2 Re: Tapping.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- pre65
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#3 Re: Tapping.
Yep, I buy my drills from them.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
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.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- Paul Barker
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#4 Re: Tapping.
No idea lube for ally but beef dripping good otherwise.
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
#5 Re: Tapping.
Used to use Vaseline, just dip the tap in it. Cue DTB.
#7 Re: Tapping.
Wonder what burning Vicks smells like..
- Paul Barker
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#8 Re: Tapping.
You took that to a new level. Pat on the back for laddishness
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
- Dave the bass
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- pre65
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#10 Re: Tapping.
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.
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.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#11 Re: Tapping.
Hmm, you and your cheap Chinese buys. What do you expect?
- pre65
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#12 Re: Tapping.
Steady on Greg. You have absolutely no idea where they came from.
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.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- pre65
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#13 Re: Tapping.
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
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
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- Mike H
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#14 Re: Tapping.
Just a thought, 2.4mm is just about 3/32 inch ...
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."