After ordering the wrong size tap, I managed to get the replacement today...
BUT
It says it is a no 2 tap...
I googled a bit, and it seems you get 3 taps...
. Taper Tap
The tap is tapered off for a length of 8 to 10 threads and is the first tap to be used in a hole to start the thread form.
2. Second Tap
The tap is tapered off for a length of 4 to 5 threads to facilitate picking up the threads cut by the taper tap.
3. Plug Tap
This is fully threaded throughout its length and is called a 'bottoming' tap. This tap used to cut the bottom of a blind hole.
Am I right in saying that the straight flute second tap tap is the wrong thing for tapping screws into aluminium heatsinks...?
I know I could try, but then I cant return the one I got.
If I were to get only one tap, which should it be?
BUT
It says it is a no 2 tap...
I googled a bit, and it seems you get 3 taps...
. Taper Tap
The tap is tapered off for a length of 8 to 10 threads and is the first tap to be used in a hole to start the thread form.
2. Second Tap
The tap is tapered off for a length of 4 to 5 threads to facilitate picking up the threads cut by the taper tap.
3. Plug Tap
This is fully threaded throughout its length and is called a 'bottoming' tap. This tap used to cut the bottom of a blind hole.
Am I right in saying that the straight flute second tap tap is the wrong thing for tapping screws into aluminium heatsinks...?
I know I could try, but then I cant return the one I got.
If I were to get only one tap, which should it be?
Thanks, I'm still learning, at least I got lots of practice with the cheapie set. I used a cordless drill with torque set low... broke the tap, when I forgot to set it low again after turning the torque up to get the tap out of the hole before... but I still see tap and die sets into several hundred dollars that just have one tap per size...
Yep I got two crap ones....
naah the dril works lovely with the small taps... was purely a user error... Actualy its a tip I learned from Peter Daniels...
However with the larger M6 nuts I had to use the t-bar... but because the tab is bigger it fits more or less properly in it... the smaller taps tend to slip out of the bar...also i tend to wriggle them a bit too much during the first taps sometimes, whereas the drill punches through straight.... in the deeper holes I start them off with the drill and finish by hand, once the first few threads are established as a guide...
The drill's speed adjusts according to how deep you hold the trigger in, so it does not run out of control.
Richie many thanks for your help.... I am a total noob with these things... and love to learn how to use tools properly...
naah the dril works lovely with the small taps... was purely a user error... Actualy its a tip I learned from Peter Daniels...
However with the larger M6 nuts I had to use the t-bar... but because the tab is bigger it fits more or less properly in it... the smaller taps tend to slip out of the bar...also i tend to wriggle them a bit too much during the first taps sometimes, whereas the drill punches through straight.... in the deeper holes I start them off with the drill and finish by hand, once the first few threads are established as a guide...
The drill's speed adjusts according to how deep you hold the trigger in, so it does not run out of control.
Richie many thanks for your help.... I am a total noob with these things... and love to learn how to use tools properly...
The middle tap is all you need unless you want to thread right down into a blind hole.
To get started a small countersink helps and if you take some care in lining up the tap for the first few turns you will get a nice result.
If you are using hand taps they are (presumably) designed to be turned by hand and its a good idea to use some lubricant.
I don't know about the drill business. If it works then good but I like the feel of doing it by hand.
Its obvious but get the correct size drill bit for the job!
To get started a small countersink helps and if you take some care in lining up the tap for the first few turns you will get a nice result.
If you are using hand taps they are (presumably) designed to be turned by hand and its a good idea to use some lubricant.
I don't know about the drill business. If it works then good but I like the feel of doing it by hand.
Its obvious but get the correct size drill bit for the job!
Sadly thats exactly what I need to do... sink about 7- or 8mm into a 10mm thick base.
One sink is done and the next needs to be tapped now... and I now have to wait over a week for the new 3 piece M3 tap set, not to mention the $30 cost.
Think I should order a nice tap wrench while I have to wait anyway.
The way I do it with the drill is to set the clutch to 3 and tap till it starts slipping. and increment the torque in half number increments untill it slips and would appear to need a large increment in torque setting to budge, then I hit reverese and slowly bring out the tap, clean it off nicely with some kitchen towel, wd40 the hole and go at it again, or switch to hand, for thin straight through holes, I just clamp, the target in the vice and run it through one time on high torque...
One sink is done and the next needs to be tapped now... and I now have to wait over a week for the new 3 piece M3 tap set, not to mention the $30 cost.
Think I should order a nice tap wrench while I have to wait anyway.
The way I do it with the drill is to set the clutch to 3 and tap till it starts slipping. and increment the torque in half number increments untill it slips and would appear to need a large increment in torque setting to budge, then I hit reverese and slowly bring out the tap, clean it off nicely with some kitchen towel, wd40 the hole and go at it again, or switch to hand, for thin straight through holes, I just clamp, the target in the vice and run it through one time on high torque...
Taps for screw holes...
Hi Nordic
You should NEVER EVER use a powertool for taps. There are many places here in Cape Town where you can buy any imagineable tapset. Sorry, can't mention them here. Look in the Yellow Pagers under "Engineering Supplies".
Also, depending on the metal you're tapping, you need a lubricant specific to the metal you're tapping. The tap supplier will give you advice.
Furthermore, there are charts stocked by these supply companies which lists the appropriate drill size for any particular tap.
You may get away with a # 2 tap if you cannot buy a set of 3.
The only time where you can get away with using a rechargeable is if you need long threaded roundbar. I have done this with 3mm aluminium roundbar by clamping the die in a vice and the job into a rechargeable. Go slow and lubricate.
Btw, I'm a veteran of breaking pricey taps (by hand). "Tap" wood, not for the last few years though. Practise makes perfect.
bulgin
Hi Nordic
You should NEVER EVER use a powertool for taps. There are many places here in Cape Town where you can buy any imagineable tapset. Sorry, can't mention them here. Look in the Yellow Pagers under "Engineering Supplies".
Also, depending on the metal you're tapping, you need a lubricant specific to the metal you're tapping. The tap supplier will give you advice.
Furthermore, there are charts stocked by these supply companies which lists the appropriate drill size for any particular tap.
You may get away with a # 2 tap if you cannot buy a set of 3.
The only time where you can get away with using a rechargeable is if you need long threaded roundbar. I have done this with 3mm aluminium roundbar by clamping the die in a vice and the job into a rechargeable. Go slow and lubricate.
Btw, I'm a veteran of breaking pricey taps (by hand). "Tap" wood, not for the last few years though. Practise makes perfect.
bulgin
Thanks oom B.
I was lucky the tap broke about a cm from the aluminium block, and I was able to reverse it out with pliers.
Would you mind terribly to hit my E-mail button bellow and send me some suggestions for places I can have a look for taps, The guy that can do the return and credit for me at RS will only be in on Monday, so I can always just tell him not to order the set, and avoid the 2 week wait. (or as the site says, 5 to 6 working days)... yeah right.
I was lucky the tap broke about a cm from the aluminium block, and I was able to reverse it out with pliers.
Would you mind terribly to hit my E-mail button bellow and send me some suggestions for places I can have a look for taps, The guy that can do the return and credit for me at RS will only be in on Monday, so I can always just tell him not to order the set, and avoid the 2 week wait. (or as the site says, 5 to 6 working days)... yeah right.
Hi,
A good quality set of hand taps consist of 3 pieces. They not only differ in tapering but also in the depth they cut the tread. So you need to use them all three to do it properly. Only el cheapo taps have the same depth for cutting the thread (but differ in tapering).
There are also taps that is just one tap to do the job. These are so called machine taps. They come in 2 different flavours: Cutting forward and cutting backward. Cutting forward ones are intended for through holes and cutting backward ones for blind holes. These are more expensive than a regular set of hand taps but speed up the job a lot if you have to do many holes. When you are adapted to these you don’t want others anymore.
Oh eh, for lubricating, household spirit (methylated ethyl alcohol) does the job best for aluminium. Not only for tapping but also for drilling and other machining.
Cheers
A good quality set of hand taps consist of 3 pieces. They not only differ in tapering but also in the depth they cut the tread. So you need to use them all three to do it properly. Only el cheapo taps have the same depth for cutting the thread (but differ in tapering).
There are also taps that is just one tap to do the job. These are so called machine taps. They come in 2 different flavours: Cutting forward and cutting backward. Cutting forward ones are intended for through holes and cutting backward ones for blind holes. These are more expensive than a regular set of hand taps but speed up the job a lot if you have to do many holes. When you are adapted to these you don’t want others anymore.
Oh eh, for lubricating, household spirit (methylated ethyl alcohol) does the job best for aluminium. Not only for tapping but also for drilling and other machining.
Cheers
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